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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

import "./interfaces/IVotingEscrowV2.sol";
import "./interfaces/IVoterV5/IVoterV5.sol";
import "./interfaces/IRewardsDistributor.sol";
import "./interfaces/IMinter.sol";
import "./interfaces/IBribe.sol";
import "./libraries/VeHelper.sol";
import "./libraries/CallLib.sol";
import "./access/VeAccessControlUpgradeable.sol";
import "./interfaces/IVotingEscrowVault.sol";
import "./interfaces/IBribeOptionTokenV2.sol";

/**
 * @title VotingEscrowManager
 * @notice Manages VE NFTs and automation for VotingEscrowVault
 * @dev Handles all VE operations: merging, splitting, voting, reward claiming
 */
contract VotingEscrowManager is VeAccessControlUpgradeable, IERC721ReceiverUpgradeable {
    using SafeERC20Upgradeable for IERC20Upgradeable;
    using VeHelper for IVotingEscrowV2;

    /// -----------------------------------------------------------------------
    /// Structs
    /// -----------------------------------------------------------------------

    struct VoteRecord {
        uint256 epoch;
        address[] pools;
        uint256[] weights;
        uint256 timestamp;
    }

    /// -----------------------------------------------------------------------
    /// State Variables
    /// -----------------------------------------------------------------------

    /// @notice VE token contract interface
    IVotingEscrowV2 public veToken;

    /// @notice Voter contract address
    address public voter;

    /// @notice Rewards distributor for rebase claims
    address public rewardsDistributor;

    /// @notice Main VE token ID owned by this contract
    uint256 public veTokenId;

    /// @notice Address of the vault that can call deposit/withdraw functions
    address public vault;

    /// @notice Mapping of trusted call targets
    mapping(address => bool) public trustedCallTargets;

    /// @notice Fee in basis points (out of 10_000) applied to reward notifications
    uint256 public feeBps;

    /// @notice Address receiving the fee portion of rewards
    address public feeRecipient;

    /// @notice Mapping of vote records by epoch
    mapping(uint256 => VoteRecord) public voteRecords;

    /// @notice Last vote epoch
    uint256 public lastVoteEpoch;

    /// @notice Optional BribeOptionTokenV2 contract address
    address public bveToken;

    /// @dev Gap for future storage variables
    uint256[50] private __gap;

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------

    event VoteExecuted(uint256 indexed epoch, address[] pools, uint256[] weights);
    event BribesClaimed(address[] bribes);
    event FeesClaimed(address[] fees);
    event RebaseClaimed(uint256 amount);
    event CallExecuted(address indexed target, bytes data, bytes result);
    event VeNftDeposited(uint256 indexed veTokenId, uint256 lockedAmount);
    event VeNftWithdrawn(uint256 indexed newTokenId, uint256 amount, address indexed receiver);
    event VeNftMerged(uint256 indexed fromTokenId, uint256 indexed toTokenId);
    event VaultUpdated(address indexed oldVault, address indexed newVault);
    event TrustedCallTargetUpdated(address indexed target, bool indexed trusted);
    event RewardNotified(uint256 delta);
    event RewardsClaimed(uint256 indexed epoch, uint256 indexed veTokenId);
    event RewardsClaimedForRange(uint256 indexed epoch, uint256 indexed startIndex, uint256 endIndex);
    event SweepWithdrawToken(address indexed to, IERC20 indexed token, uint256 amount);
    event SweepWithdrawNft(address indexed to, address indexed nft, uint256 indexed veTokenId);
    event FeeParametersUpdated(uint256 feeBps, address indexed feeRecipient);
    event BveTokenExercised(uint256 indexed amount, uint256 indexed newTokenId, uint256 indexed mergedTokenId);
    event BveTokenUpdated(address indexed oldBveToken, address indexed newBveToken);

    /// -----------------------------------------------------------------------
    /// Errors
    /// -----------------------------------------------------------------------

    error Unauthorized();
    error InvalidArrayLength();
    error InvalidTokenId();
    error CallFailed();
    error ZeroAddress();
    error ZeroAmount();
    error OnlyVault();
    error InvalidTarget();
    error InvalidFee();
    error VoteRecordNotFound();
    error BveTokenNotSet();
    error AmountMismatch();
    error ArrayLengthMismatch();
    error InsufficientTokenBalance();
    error InvalidRange();

    /// -----------------------------------------------------------------------
    /// Modifiers
    /// -----------------------------------------------------------------------

    modifier onlyVault() {
        if (msg.sender != vault) revert OnlyVault();
        _;
    }

    /// -----------------------------------------------------------------------
    /// Constructor
    /// -----------------------------------------------------------------------

    constructor() {
        _disableInitializers();
    }

    function initialize(
        address _veToken,
        address _voter,
        address _rewardsDistributor,
        address _bveToken,
        address _admin,
        address _automationAddress,
        address[] memory _operators
    ) external initializer {
        __VeAccessControlUpgradeable_init(_admin, _automationAddress, _operators);

        if (_veToken == address(0) || _voter == address(0) || _rewardsDistributor == address(0)) {
            revert ZeroAddress();
        }

        veToken = IVotingEscrowV2(_veToken);
        voter = _voter;
        rewardsDistributor = _rewardsDistributor;
        bveToken = _bveToken;
        feeBps = 0;
        feeRecipient = owner();
    }

    /// -----------------------------------------------------------------------
    /// Vault Interface Functions
    /// -----------------------------------------------------------------------

    /**
     * @notice Deposit VE NFT from vault
     * @param _veTokenId VE NFT token ID to manage
     * @param _expectedAmount Expected locked amount for validation
     */
    function depositNft(uint256 _veTokenId, uint256 _expectedAmount) external onlyVault {
        // Validate the NFT
        IVotingEscrowV2.LockDetails memory lockDetails = veToken.lockDetails(_veTokenId);
        if (lockDetails.amount != _expectedAmount) revert AmountMismatch();

        // Merge VE NFT into main position
        if (!lockDetails.isPermanent) {
            veToken.lockPermanent(_veTokenId);
        }
        if (veTokenId == 0) {
            veTokenId = _veTokenId;
        } else {
            veToken.merge(_veTokenId, veTokenId);
            emit VeNftMerged(_veTokenId, veTokenId);
        }

        emit VeNftDeposited(veTokenId, _expectedAmount);
    }

    /**
     * @notice Withdraw VE NFT for vault
     * @param amount Amount of underlying tokens to withdraw
     * @param receiver Address to receive the new VE NFT
     * @return newTokenId ID of the newly created VE NFT
     */
    function withdrawNft(uint256 amount, address receiver) external onlyVault returns (uint256 newTokenId) {
        if (veTokenId == 0) revert InvalidTokenId();
        if (amount == 0) revert ZeroAmount();

        // Split VE NFT and send to receiver
        newTokenId = veToken.splitAndSend(veTokenId, amount, receiver);

        emit VeNftWithdrawn(newTokenId, amount, receiver);

        return newTokenId;
    }

    /// -----------------------------------------------------------------------
    /// Automation Functions
    /// -----------------------------------------------------------------------

    /**
     * @notice Vote for pools with specified weights
     */
    function vote(address[] calldata pools, uint256[] calldata weights) external onlyOwnerOrRole(OPERATIONS_ROLE) {
        if (veTokenId == 0) revert InvalidTokenId();
        if (pools.length != weights.length) {
            revert InvalidArrayLength();
        }
        uint256 epoch = IMinter(IVoterV5(voter).minter()).active_period();
        IVoterV5(voter).vote(pools, weights);
        IVotingEscrowVault(vault).disableRedeem();
        lastVoteEpoch = epoch;
        voteRecords[epoch] = VoteRecord({epoch: epoch, pools: pools, weights: weights, timestamp: block.timestamp});
        emit VoteExecuted(epoch, pools, weights);
    }

    function claimRebase() external onlyOwnerOrRole(OPERATIONS_ROLE) {
        if (veTokenId == 0) revert InvalidTokenId();

        uint256 rebaseAmount = IRewardsDistributor(rewardsDistributor).claim(veTokenId);
        IVotingEscrowVault(vault).enableRedeem();

        emit RebaseClaimed(rebaseAmount);
    }

    function claimBribes(
        address[] calldata bribes,
        address[][] calldata tokens
    ) external onlyOwnerOrRole(OPERATIONS_ROLE) {
        if (veTokenId == 0) revert InvalidTokenId();
        IVoterV5(voter).claimBribes(bribes, tokens, veTokenId);
        emit BribesClaimed(bribes);
    }

    function claimRewardsForEpoch(uint256 epoch) external onlyOwnerOrRole(OPERATIONS_ROLE) {
        VoteRecord memory r = voteRecords[epoch];
        if (r.epoch == 0) revert VoteRecordNotFound();
        _claimRewardsForPools(r.pools);
        emit RewardsClaimed(epoch, veTokenId);
    }

    /**
     * @notice Claim rewards for a specific range of pools from a vote record
     * @param epoch Epoch to claim rewards for
     * @param startIndex Start index of the pools array
     * @param endIndex End index of the pools array
     */
    function claimRewardsForEpochByRange(
        uint256 epoch,
        uint256 startIndex,
        uint256 endIndex
    ) external onlyOwnerOrRole(OPERATIONS_ROLE) {
        VoteRecord memory r = voteRecords[epoch];
        if (r.epoch == 0) revert VoteRecordNotFound();
        if (startIndex > endIndex || endIndex >= r.pools.length) revert InvalidRange();

        uint256 rangeSize = endIndex - startIndex + 1;
        address[] memory poolsSlice = new address[](rangeSize);
        for (uint256 i = 0; i < rangeSize; i++) {
            poolsSlice[i] = r.pools[startIndex + i];
        }

        _claimRewardsForPools(poolsSlice);
        emit RewardsClaimedForRange(epoch, startIndex, endIndex);
    }

    /**
     * @notice Execute custom swaps via call to whitelisted router
     * @param target Router target (must be whitelisted)
     * @param data Array of encoded call payloads to the router
     * @param tokens Tokens to approve to the router
     * @param amounts Required amounts for allowance checks (approve max if insufficient)
     * @return results Return data from each call
     */
    function executeCustomSwaps(
        address target,
        bytes[] calldata data,
        address[] calldata tokens,
        uint256[] calldata amounts
    ) public onlyOwnerOrRole(OPERATIONS_ROLE) returns (bytes[] memory results) {
        if (!trustedCallTargets[target]) revert Unauthorized();
        if (tokens.length != amounts.length) revert InvalidArrayLength();

        // Ensure approvals to target
        for (uint256 i = 0; i < tokens.length; i++) {
            IERC20Upgradeable token = IERC20Upgradeable(tokens[i]);
            uint256 current = token.allowance(address(this), target);
            if (current < amounts[i]) {
                token.safeApprove(target, 0);
                token.safeApprove(target, amounts[i]);
            }
        }

        // Execute call swaps
        results = new bytes[](data.length);
        for (uint256 j = 0; j < data.length; j++) {
            results[j] = _executeCallWhitelist(target, data[j]);
        }

        return results;
    }

    /**
     * @notice Notify rewards to vault from current balance
     * @return rewardAmount Amount of rewards notified to vault
     */
    function notifyRewardsToVault() public onlyOwnerOrRole(OPERATIONS_ROLE) returns (uint256 rewardAmount) {
        address rewardTokenAddr = IVotingEscrowVault(vault).rewardOutputToken();
        rewardAmount = IERC20Upgradeable(rewardTokenAddr).balanceOf(address(this));

        if (rewardAmount > 0) {
            uint256 fee = (rewardAmount * feeBps) / 10_000;
            uint256 net = rewardAmount - fee;

            if (fee > 0) {
                IERC20Upgradeable(rewardTokenAddr).safeTransfer(feeRecipient, fee);
            }

            if (net > 0) {
                IERC20Upgradeable(rewardTokenAddr).safeTransfer(vault, net);
                IVotingEscrowVault(vault).notifyReward(net);
            }

            emit RewardNotified(rewardAmount);
        }

        return rewardAmount;
    }

    /**
     * @notice Execute all post-epoch operations in sequence
     * @param swapTarget Router target for custom swaps (can be address(0) to skip)
     * @param swapData Array of encoded call payloads to the router
     * @param swapTokens Tokens to approve to the router
     * @param swapAmounts Required amounts for allowance checks
     * @return swapResults Return data from swap operations (empty if no swaps)
     */
    function executeSwapsAndNotifyRewards(
        address swapTarget,
        bytes[] calldata swapData,
        address[] calldata swapTokens,
        uint256[] calldata swapAmounts
    ) external onlyOwnerOrRole(OPERATIONS_ROLE) returns (bytes[] memory swapResults) {
        if (swapData.length > 0 && swapTarget != address(0)) {
            swapResults = executeCustomSwaps(swapTarget, swapData, swapTokens, swapAmounts);
        }

        notifyRewardsToVault();
    }

    /**
     * @notice Exercise BribeOptionTokenV2 and merge resulting VE NFT with main position
     * @param amount Amount of bveToken to exercise
     * @return newTokenId ID of the newly created VE NFT from exercise
     */
    function exerciseBveToken(uint256 amount) external onlyOwnerOrRole(OPERATIONS_ROLE) returns (uint256 newTokenId) {
        if (bveToken == address(0)) revert BveTokenNotSet();
        if (amount == 0) revert ZeroAmount();
        if (veTokenId == 0) revert InvalidTokenId();

        // Exercise the bveToken to get a new VE NFT
        try IBribeOptionTokenV2(bveToken).exerciseVe(amount, address(this)) returns (uint256 newId) {
            newTokenId = newId;
        } catch {
            // Fallback to the other exerciseVe function if the first one fails
            newTokenId = IBribeOptionTokenV2(bveToken).exerciseVe(amount, amount, address(this), block.timestamp);
        }

        // Merge the new VE NFT with the main position
        IVotingEscrowV2.LockDetails memory lockDetails = veToken.lockDetails(newTokenId);
        if (!lockDetails.isPermanent) {
            veToken.lockPermanent(newTokenId);
        }
        veToken.merge(newTokenId, veTokenId);
        emit VeNftMerged(newTokenId, veTokenId);
        emit BveTokenExercised(amount, newTokenId, veTokenId);

        return newTokenId;
    }

    /// -----------------------------------------------------------------------
    /// Delegate Call Functions
    /// -----------------------------------------------------------------------

    function executeCall(address target, bytes calldata data) external onlyOwner returns (bytes memory result) {
        result = _executeCallWhitelist(target, data);
        return result;
    }

    function executeCallMulti(
        address[] calldata targets,
        bytes[] calldata data
    ) external onlyOwner returns (bytes[] memory results) {
        if (targets.length != data.length) revert InvalidArrayLength();
        results = new bytes[](targets.length);
        for (uint256 i = 0; i < targets.length; i++) {
            results[i] = _executeCallWhitelist(targets[i], data[i]);
        }
        return results;
    }

    /// -----------------------------------------------------------------------
    /// Admin Functions
    /// -----------------------------------------------------------------------

    /**
     * @notice Update vault address
     * @param _newVault New vault address
     */
    function setVault(address _newVault) external onlyOwner {
        if (_newVault == address(0)) revert ZeroAddress();

        address oldVault = vault;
        vault = _newVault;

        emit VaultUpdated(oldVault, _newVault);
    }

    /**
     * @notice Set trusted call target status
     * @param target Target contract address
     * @param trusted Whether the target should be trusted
     */
    function setTrustedCallTarget(address target, bool trusted) external onlyOwner {
        trustedCallTargets[target] = trusted;
        emit TrustedCallTargetUpdated(target, trusted);
    }

    /**
     * @notice Set fee in basis points (out of 10_000)
     * @param _feeBps New fee basis points
     */
    function setFeeBps(uint256 _feeBps) external onlyOwner {
        if (_feeBps > 5000) revert InvalidFee();
        feeBps = _feeBps;
        emit FeeParametersUpdated(feeBps, feeRecipient);
    }

    /**
     * @notice Set fee recipient address
     * @param _feeRecipient New fee recipient (cannot be zero)
     */
    function setFeeRecipient(address _feeRecipient) external onlyOwner {
        if (_feeRecipient == address(0)) revert ZeroAddress();
        feeRecipient = _feeRecipient;
        emit FeeParametersUpdated(feeBps, feeRecipient);
    }

    /**
     * @notice Set BribeOptionTokenV2 contract address
     * @param _bveToken New bveToken address (can be zero to disable)
     */
    function setBveToken(address _bveToken) external onlyOwner {
        address oldBveToken = bveToken;
        bveToken = _bveToken;
        emit BveTokenUpdated(oldBveToken, _bveToken);
    }

    /// -----------------------------------------------------------------------
    /// Internal Implementation Functions
    /// -----------------------------------------------------------------------

    function _claimRewardsForPools(address[] memory _pools) internal {
        (
            address[] memory externalBribes,
            address[] memory internalBribes,
            address[][] memory externalTokens,
            address[][] memory internalTokens
        ) = _buildBribeDataForPools(_pools);

        uint256 managedTokenId = veTokenId;
        IVoterV5(voter).claimBribes(externalBribes, externalTokens, managedTokenId);
        IVoterV5(voter).claimFees(internalBribes, internalTokens, managedTokenId);
    }

    /**
     * @notice Build bribe arrays and token arrays from vote record
     * @param _pools Array of pools to process
     * @return externalBribes Array of external bribe addresses
     * @return internalBribes Array of internal bribe addresses
     * @return externalTokens Array of token arrays for external bribes
     * @return internalTokens Array of token arrays for internal bribes
     */
    function _buildBribeDataForPools(
        address[] memory _pools
    )
        internal
        view
        returns (
            address[] memory externalBribes,
            address[] memory internalBribes,
            address[][] memory externalTokens,
            address[][] memory internalTokens
        )
    {
        // Build bribe arrays from pools
        externalBribes = new address[](_pools.length);
        internalBribes = new address[](_pools.length);

        for (uint256 i = 0; i < _pools.length; i++) {
            address gauge = IVoterV5(voter).gauges(_pools[i]);
            internalBribes[i] = IVoterV5(voter).internal_bribes(gauge);
            externalBribes[i] = IVoterV5(voter).external_bribes(gauge);
        }

        // External bribes tokens enumeration
        externalTokens = new address[][](externalBribes.length);
        for (uint256 bi = 0; bi < externalBribes.length; bi++) {
            address br = externalBribes[bi];
            if (br == address(0)) {
                externalTokens[bi] = new address[](0);
                continue;
            }
            uint256 numRewards = IBribe(br).rewardsListLength();
            address[] memory tokens = new address[](numRewards);
            for (uint256 ri = 0; ri < numRewards; ri++) {
                tokens[ri] = IBribe(br).rewardTokens(ri);
            }
            externalTokens[bi] = tokens;
        }

        // Internal fees tokens enumeration
        internalTokens = new address[][](internalBribes.length);
        for (uint256 bj = 0; bj < internalBribes.length; bj++) {
            address br2 = internalBribes[bj];
            if (br2 == address(0)) {
                internalTokens[bj] = new address[](0);
                continue;
            }
            uint256 numRewards2 = IBribe(br2).rewardsListLength();
            address[] memory tokens2 = new address[](numRewards2);
            for (uint256 rj = 0; rj < numRewards2; rj++) {
                tokens2[rj] = IBribe(br2).rewardTokens(rj);
            }
            internalTokens[bj] = tokens2;
        }
    }

    /**
     * @notice Get all unique token addresses from bribes and fees for a vote record
     * @param _pools Array of pools to get tokens for
     * @return tokens Array of unique token addresses
     */
    function _getVoteTokensForPools(address[] memory _pools) internal view returns (address[] memory tokens) {
        (
            ,
            ,
            // externalBribes - unused
            // internalBribes - unused
            address[][] memory externalTokens,
            address[][] memory internalTokens
        ) = _buildBribeDataForPools(_pools);

        // Collect all tokens first (with potential duplicates)
        address[] memory tempTokens = new address[](1000); // Max 1000 tokens
        uint256 tokenCount = 0;

        // Collect external bribe tokens
        for (uint256 bi = 0; bi < externalTokens.length; bi++) {
            for (uint256 ri = 0; ri < externalTokens[bi].length; ri++) {
                tempTokens[tokenCount] = externalTokens[bi][ri];
                tokenCount++;
            }
        }

        // Collect internal fee tokens
        for (uint256 bj = 0; bj < internalTokens.length; bj++) {
            for (uint256 rj = 0; rj < internalTokens[bj].length; rj++) {
                tempTokens[tokenCount] = internalTokens[bj][rj];
                tokenCount++;
            }
        }

        // Deduplicate using nested loops
        address[] memory uniqueTokens = new address[](tokenCount);
        uint256 uniqueCount = 0;

        for (uint256 i = 0; i < tokenCount; i++) {
            address token = tempTokens[i];
            bool exists = false;

            // Check if token already exists in uniqueTokens
            for (uint256 j = 0; j < uniqueCount; j++) {
                if (uniqueTokens[j] == token) {
                    exists = true;
                    break;
                }
            }

            if (!exists) {
                uniqueTokens[uniqueCount] = token;
                uniqueCount++;
            }
        }

        // Create final array with exact size
        tokens = new address[](uniqueCount);
        for (uint256 i = 0; i < uniqueCount; i++) {
            tokens[i] = uniqueTokens[i];
        }
    }

    /**
     * @notice Execute arbitrary delegate call for maximum flexibility
     * @param target Target contract address
     * @param data Encoded function call data
     * @return result Return data from the delegate call
     */
    function _executeCallWhitelist(address target, bytes calldata data) internal returns (bytes memory result) {
        if (!trustedCallTargets[target]) revert Unauthorized();
        if (target == address(0)) revert InvalidTarget();
        (bool success, bytes memory returnData) = target.call(data);
        result = CallLib.handleCallResult(success, returnData);
        emit CallExecuted(target, data, result);
        return result;
    }

    /// -----------------------------------------------------------------------
    /// View Functions
    /// -----------------------------------------------------------------------

    /**
     * @notice Get VE voting power
     */
    function getVeVotingPower() external view returns (uint256) {
        uint256 epoch = IMinter(IVoterV5(voter).minter()).active_period();
        return veToken.getVotingPower(veTokenId, epoch);
    }

    /**
     * @notice Get VE lock details
     */
    function getVeLockDetails() external view returns (IVotingEscrowV2.LockDetails memory) {
        return veToken.getLockDetails(veTokenId);
    }

    /**
     * @notice Get total locked amount
     */
    function getTotalLockedAmount() external view returns (uint256) {
        return veToken.getLockDetails(veTokenId).amount;
    }

    /**
     * @notice Get claimable rebase amount
     */
    function getClaimableRebase() external view returns (uint256) {
        if (veTokenId == 0 || rewardsDistributor == address(0)) return 0;
        return IRewardsDistributor(rewardsDistributor).claimable(veTokenId);
    }

    /**
     * @notice Return the current epoch from the voter minter
     */
    function getCurrentEpoch() public view returns (uint256) {
        return IMinter(IVoterV5(voter).minter()).active_period();
    }

    /**
     * @notice Fetch a stored vote record for an epoch
     */
    function getVoteRecord(uint256 epoch) external view returns (VoteRecord memory) {
        return voteRecords[epoch];
    }

    /**
     * @notice Get the number of pools voted for in a specific epoch
     * @param epoch Epoch to get pool count for
     * @return uint256 Number of pools
     */
    function getVotePoolCount(uint256 epoch) external view returns (uint256) {
        VoteRecord memory r = voteRecords[epoch];
        if (r.epoch == 0) revert VoteRecordNotFound();
        return r.pools.length;
    }

    /**
     * @notice Return the last epoch this manager voted for
     */
    function getLastVoteEpoch() external view returns (uint256) {
        return lastVoteEpoch;
    }

    /**
     * @notice Get all unique token addresses from bribes and fees for a specific vote record
     * @param epoch Epoch to get tokens for
     * @return tokens Flat array of unique token addresses
     */
    function getVoteTokens(uint256 epoch) external view returns (address[] memory tokens) {
        VoteRecord memory r = voteRecords[epoch];
        if (r.epoch == 0) revert VoteRecordNotFound();
        return _getVoteTokensForPools(r.pools);
    }

    /**
     * @notice Get vote tokens with their current balances in this contract
     * @param epoch Epoch to get tokens for
     * @return tokens Array of token addresses
     * @return balances Array of current token balances in this contract
     */
    function getVoteTokensWithBalances(
        uint256 epoch
    ) external view returns (address[] memory tokens, uint256[] memory balances) {
        VoteRecord memory r = voteRecords[epoch];
        if (r.epoch == 0) revert VoteRecordNotFound();

        tokens = _getVoteTokensForPools(r.pools);
        balances = new uint256[](tokens.length);

        for (uint256 i = 0; i < tokens.length; i++) {
            balances[i] = IERC20Upgradeable(tokens[i]).balanceOf(address(this));
        }
    }

    /**
     * @notice Get current bveToken balance in this contract
     * @return balance Current balance of bveToken
     */
    function getBveTokenBalance() external view returns (uint256 balance) {
        if (bveToken == address(0)) return 0;
        return IERC20Upgradeable(bveToken).balanceOf(address(this));
    }

    /// -----------------------------------------------------------------------
    /// ERC721 Receiver
    /// -----------------------------------------------------------------------

    function onERC721Received(address, address, uint256, bytes calldata) external pure override returns (bytes4) {
        return IERC721ReceiverUpgradeable.onERC721Received.selector;
    }

    /// -----------------------------------------------------------------------
    /// Recovery Functions (Owner-only)
    /// -----------------------------------------------------------------------

    function sweepTokens(IERC20[] memory tokens, uint256[] memory amounts, address to) public onlyOwner {
        if (tokens.length != amounts.length) revert ArrayLengthMismatch();
        for (uint256 i = 0; i < tokens.length; i++) {
            IERC20 token = tokens[i];
            uint256 amount = amounts[i];
            uint256 balance = token.balanceOf(address(this));
            if (balance < amount) revert InsufficientTokenBalance();
            token.transfer(to, amount);
            emit SweepWithdrawToken(to, token, amount);
        }
    }

    function sweepNfts(address[] calldata nfts, uint256[] calldata tokenIds, address to) external onlyOwner {
        if (nfts.length != tokenIds.length) revert ArrayLengthMismatch();
        for (uint256 i = 0; i < nfts.length; i++) {
            address nft = nfts[i];
            uint256 nftTokenId = tokenIds[i];
            IERC721Upgradeable(nft).safeTransferFrom(address(this), to, nftTokenId);
            emit SweepWithdrawNft(to, nft, nftTokenId);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlEnumerableUpgradeable.sol";
import "./AccessControlUpgradeable.sol";
import "../utils/structs/EnumerableSetUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerableUpgradeable is Initializable, IAccessControlEnumerableUpgradeable, AccessControlUpgradeable {
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;

    mapping(bytes32 => EnumerableSetUpgradeable.AddressSet) private _roleMembers;

    function __AccessControlEnumerable_init() internal onlyInitializing {
    }

    function __AccessControlEnumerable_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlEnumerableUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../utils/StringsUpgradeable.sol";
import "../utils/introspection/ERC165Upgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        StringsUpgradeable.toHexString(account),
                        " is missing role ",
                        StringsUpgradeable.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerableUpgradeable is IAccessControlUpgradeable {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20Upgradeable token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && AddressUpgradeable.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMathUpgradeable {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/MathUpgradeable.sol";
import "./math/SignedMathUpgradeable.sol";

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = MathUpgradeable.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMathUpgradeable.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, MathUpgradeable.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSetUpgradeable {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol)

pragma solidity ^0.8.0;

import "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/access/AccessControlEnumerableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

/**
 * @title VeAccessControlUpgradeable
 * @notice Access control contract for VE vault system based on ApeBond pattern
 * @dev Manages ownership and role-based access for VE vault contracts
 */
contract VeAccessControlUpgradeable is OwnableUpgradeable, AccessControlEnumerableUpgradeable {
    /* ======== STATE ======== */

    /// @notice Operations role, used to adjust specific settings on the vault
    bytes32 public constant OPERATIONS_ROLE = keccak256("OPERATIONS_ROLE");

    /// @notice Automation role, used to manage automation and strategy execution
    bytes32 public constant AUTOMATION_ROLE = keccak256("AUTOMATION_ROLE");

    /// @notice Voting role, used for governance voting operations
    bytes32 public constant VOTING_ROLE = keccak256("VOTING_ROLE");

    /* ======== INITIALIZATION ======== */

    function __VeAccessControlUpgradeable_init(
        address _initialOwner,
        address _automationAddress,
        address[] memory _operators
    ) internal onlyInitializing {
        __Ownable_init();
        _transferOwnership(_initialOwner);
        _grantRole(AUTOMATION_ROLE, _automationAddress);
        for (uint256 i = 0; i < _operators.length; i++) {
            _grantRole(OPERATIONS_ROLE, _operators[i]);
        }
    }

    /* ======== MODIFIERS ======== */

    modifier onlyOwnerOrRole(bytes32 role1) {
        require(msg.sender == owner() || hasRole(role1, msg.sender), "Caller is not owner or has required role");
        _;
    }

    modifier onlyOwnerOrRoles(bytes32 role1, bytes32 role2) {
        require(
            msg.sender == owner() || hasRole(role1, msg.sender) || hasRole(role2, msg.sender),
            "Caller is not owner or has required role"
        );
        _;
    }

    modifier onlyOwnerOrRoles3(
        bytes32 role1,
        bytes32 role2,
        bytes32 role3
    ) {
        require(
            msg.sender == owner() ||
                hasRole(role1, msg.sender) ||
                hasRole(role2, msg.sender) ||
                hasRole(role3, msg.sender),
            "Caller is not owner or has required role"
        );
        _;
    }

    /* ======== onlyOwner FUNCTIONS ======== */

    /**
     * @notice Grant a role
     * @param role The role to grant
     * @param account The address to grant the role to
     */
    function grantRole(
        bytes32 role,
        address account
    ) public override(AccessControlUpgradeable, IAccessControlUpgradeable) onlyOwner {
        _grantRole(role, account);
    }

    /**
     * @notice Revoke a role
     * @param role The role to revoke
     * @param account The address to revoke the role from
     */
    function revokeRole(
        bytes32 role,
        address account
    ) public override(AccessControlUpgradeable, IAccessControlUpgradeable) onlyOwner {
        _revokeRole(role, account);
    }

    /* ======== VIEW FUNCTIONS ======== */

    /**
     * @notice Get all addresses with a specific role
     * @param role The role to query
     * @return addresses Array of addresses with the role
     */
    function getRoleMembers(bytes32 role) external view returns (address[] memory addresses) {
        uint256 memberCount = getRoleMemberCount(role);
        addresses = new address[](memberCount);
        for (uint256 i = 0; i < memberCount; i++) {
            addresses[i] = getRoleMember(role, i);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IBribe is IERC165 {
    function deposit(uint amount, address account) external;

    function withdraw(uint amount, address account) external;

    function getRewardForOwner(uint tokenId, address[] memory tokens) external;

    function getRewardForAddress(address _owner, address[] memory tokens) external;

    function notifyRewardAmount(address token, uint amount) external;

    function addRewardToken(address _rewardsToken) external;

    function addRewardTokens(address[] memory _rewardsToken) external;

    function setVoter(address _Voter) external;

    function setMinter(address _Voter) external;

    function setOwner(address _Voter) external;

    function emergencyRecoverERC20(address tokenAddress, uint256 tokenAmount) external;

    function recoverERC20AndUpdateData(address tokenAddress, uint256 tokenAmount) external;

    function rewardsListLength() external view returns (uint256);

    function rewardTokens(uint256) external view returns (address);
}

interface IBribe_Init is IBribe {
    function initialize(address _owner, address _voter, address _bribeFactory, string memory _type) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title BribeOptionTokenV2
 * @notice Interface for the BribeOptionTokenV2 contract
 */
interface IBribeOptionTokenV2 {
    function exerciseVe(uint256 _amount, address _recipient) external returns (uint256 nftId);
    function exerciseVe(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient,
        uint256 _deadline
    ) external returns (uint256 nftId);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface ICheckpoints {
    /**
     * @dev Struct to keep track of the voting power over time.
     */
    struct Point {
        /// @dev The voting power at a specific time
        /// - MUST never be negative.
        int128 bias;
        /// @dev The rate at which the voting power decreases over time.
        int128 slope;
        /// @dev The value of tokens which do not decrease over time, representing permanent voting power
        /// - MUST never be negative.
        int128 permanent;
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.7.0;

interface IDynamicTwapOracle {
    /**
     * @notice Get the address of the pool
     * @return The address of the pool
     */
    function pool() external view returns (address);

    /**
     * @notice Get the address of the first token in the pool
     * @return The address of the first token
     */
    function token0() external view returns (address);

    /**
     * @notice Get the address of the second token in the pool
     * @return The address of the second token
     */
    function token1() external view returns (address);

    /**
     * @notice Estimate the output amount of a trade
     * @param tokenIn The address of the input token
     * @param amountIn The amount of the input token
     * @param secondsAgo The number of seconds ago to start the TWAP
     * @return amountOut The estimated output amount
     */
    function estimateAmountOut(
        address tokenIn,
        uint128 amountIn,
        uint32 secondsAgo
    ) external view returns (uint amountOut);
}

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.0;
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
/**
 * @title Non-Fungible Vesting Token Standard.
 * @notice A non-fungible token standard used to vest ERC-20 tokens over a vesting release curve
 *  scheduled using timestamps.
 * @dev Because this standard relies on timestamps for the vesting schedule, it's important to keep track of the
 *  tokens claimed per Vesting NFT so that a user cannot withdraw more tokens than allotted for a specific Vesting NFT.
 * @custom:interface-id 0xbd3a202b
 */
interface IERC5725Upgradeable is IERC721Upgradeable {
    /**
     *  This event is emitted when the payout is claimed through the claim function.
     *  @param tokenId the NFT tokenId of the assets being claimed.
     *  @param recipient The address which is receiving the payout.
     *  @param claimAmount The amount of tokens being claimed.
     */
    event PayoutClaimed(uint256 indexed tokenId, address indexed recipient, uint256 claimAmount);

    /**
     *  This event is emitted when an `owner` sets an address to manage token claims for all tokens.
     *  @param owner The address setting a manager to manage all tokens.
     *  @param spender The address being permitted to manage all tokens.
     *  @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    event ClaimApprovalForAll(address indexed owner, address indexed spender, bool approved);

    /**
     *  This event is emitted when an `owner` sets an address to manage token claims for a `tokenId`.
     *  @param owner The `owner` of `tokenId`.
     *  @param spender The address being permitted to manage a tokenId.
     *  @param tokenId The unique identifier of the token being managed.
     *  @param approved A boolean indicating whether the spender is approved to claim for `tokenId`.
     */
    event ClaimApproval(address indexed owner, address indexed spender, uint256 indexed tokenId, bool approved);

    /**
     * @notice Claim the pending payout for the NFT.
     * @dev MUST grant the claimablePayout value at the time of claim being called to `msg.sender`.
     *  MUST revert if not called by the token owner or approved users.
     *  MUST emit PayoutClaimed.
     *  SHOULD revert if there is nothing to claim.
     * @param tokenId The NFT token id.
     */
    function claim(uint256 tokenId) external;

    /**
     * @notice Number of tokens for the NFT which have been claimed at the current timestamp.
     * @param tokenId The NFT token id.
     * @return payout The total amount of payout tokens claimed for this NFT.
     */
    function claimedPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Number of tokens for the NFT which can be claimed at the current timestamp.
     * @dev It is RECOMMENDED that this is calculated as the `vestedPayout()` subtracted from `payoutClaimed()`.
     * @param tokenId The NFT token id.
     * @return payout The amount of unlocked payout tokens for the NFT which have not yet been claimed.
     */
    function claimablePayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Total amount of tokens which have been vested at the current timestamp.
     *  This number also includes vested tokens which have been claimed.
     * @dev It is RECOMMENDED that this function calls `vestedPayoutAtTime`
     *  with `block.timestamp` as the `timestamp` parameter.
     * @param tokenId The NFT token id.
     * @return payout Total amount of tokens which have been vested at the current timestamp.
     */
    function vestedPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Total amount of vested tokens at the provided timestamp.
     *  This number also includes vested tokens which have been claimed.
     * @dev `timestamp` MAY be both in the future and in the past.
     *  Zero MUST be returned if the timestamp is before the token was minted.
     * @param tokenId The NFT token id.
     * @param timestamp The timestamp to check on, can be both in the past and the future.
     * @return payout Total amount of tokens which have been vested at the provided timestamp.
     */
    function vestedPayoutAtTime(uint256 tokenId, uint256 timestamp) external view returns (uint256 payout);

    /**
     * @notice Number of tokens for an NFT which are currently vesting.
     * @dev The sum of vestedPayout and vestingPayout SHOULD always be the total payout.
     * @param tokenId The NFT token id.
     * @return payout The number of tokens for the NFT which are vesting until a future date.
     */
    function vestingPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice The start and end timestamps for the vesting of the provided NFT.
     *  MUST return the timestamp where no further increase in vestedPayout occurs for `vestingEnd`.
     * @param tokenId The NFT token id.
     * @return vestingStart The beginning of the vesting as a unix timestamp.
     * @return vestingEnd The ending of the vesting as a unix timestamp.
     */
    function vestingPeriod(uint256 tokenId) external view returns (uint256 vestingStart, uint256 vestingEnd);

    /**
     * @notice Token which is used to pay out the vesting claims.
     * @param tokenId The NFT token id.
     * @return token The token which is used to pay out the vesting claims.
     */
    function payoutToken(uint256 tokenId) external view returns (address token);

    /**
     * @notice Sets a global `operator` with permission to manage all tokens owned by the current `msg.sender`.
     * @param operator The address to let manage all tokens.
     * @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    function setClaimApprovalForAll(address operator, bool approved) external;

    /**
     * @notice Sets a tokenId `operator` with permission to manage a single `tokenId` owned by the `msg.sender`.
     * @param operator The address to let manage a single `tokenId`.
     * @param tokenId the `tokenId` to be managed.
     * @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    function setClaimApproval(address operator, bool approved, uint256 tokenId) external;

    /**
     * @notice Returns true if `owner` has set `operator` to manage all `tokenId`s.
     * @param owner The owner allowing `operator` to manage all `tokenId`s.
     * @param operator The address who is given permission to spend tokens on behalf of the `owner`.
     */
    function isClaimApprovedForAll(address owner, address operator) external view returns (bool isClaimApproved);

    /**
     * @notice Returns the operating address for a `tokenId`.
     *  If `tokenId` is not managed, then returns the zero address.
     * @param tokenId The NFT `tokenId` to query for a `tokenId` manager.
     */
    function getClaimApproved(uint256 tokenId) external view returns (address operator);
}

interface IERC5725_ExtendedApproval is IERC5725Upgradeable {
    /**
     * @notice Returns true if `operator` is allowed to transfer the `tokenId` NFT.
     * @param operator The address to check if it is approved for the transfer
     * @param tokenId The token id to check if the operator is approved for
     */
    function isApprovedOrOwner(address operator, uint tokenId) external view returns (bool);

    /**
     * @notice Returns true if `operator` is allowed to claim for the provided tokenId
     * @param operator The address to check if it is approved for the claim or owner of the token
     * @param tokenId The token id to check if the operator is approved for
     */
    function isApprovedClaimOrOwner(address operator, uint256 tokenId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IGauge {
    function notifyRewardAmount(address token, uint amount) external;

    function getReward(address account, address[] memory tokens) external;

    function getReward(address account) external;

    function claimFees() external returns (uint claimed0, uint claimed1);

    function rewardRate(address _pair) external view returns (uint);

    function balanceOf(address _account) external view returns (uint);

    function isForPair() external view returns (bool);

    function totalSupply() external view returns (uint);

    function earned(address token, address account) external view returns (uint);

    function stakeToken() external view returns (address);

    function setDistribution(address _distro) external;

    function addRewardToken(address _rewardToken) external;

    function removeRewardToken(address _rewardToken) external;

    function updateRewardToken() external;

    function activateEmergencyMode() external;

    function stopEmergencyMode() external;

    function setInternalBribe(address intbribe) external;

    function setGaugeRewarder(address _gr) external;

    function setFeeVault(address _feeVault) external;

    function depositWithLock(address account, uint256 amount, uint256 _lockDuration) external;

    function sweepTokens(address[] memory tokens, uint256[] memory amounts, address to) external;

    function initialize(
        address _rewardToken,
        address _ve,
        address _stakeToken,
        address _distribution,
        address _internal_bribe,
        address _external_bribe,
        bool _isForPair
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IMinter {
    function update_period() external returns (uint256);
    function check() external view returns (bool);
    function period() external view returns (uint256);
    function active_period() external view returns (uint256);
    function WEEK() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.13;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";

interface IOption is IAccessControl {
    function paymentToken() external view returns (IERC20);

    function getPaymentAmount(uint256 _amount, bytes calldata _data) external view returns (uint256);

    function exercise(uint256 _amount, address sender, bytes calldata _data) external returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.0;

interface IOptionFeeDistributor {
    function distribute(address token, uint256 amount) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.0;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";
import {IDynamicTwapOracle} from "./IDynamicTwapOracle.sol";
import {IOptionFeeDistributor} from "./IOptionFeeDistributor.sol";
import {IPair} from "./IPair.sol";
import {IOption} from "./IOption.sol";

interface IOptionTokenV3 is IERC20, IAccessControl {
    function ADMIN_ROLE() external view returns (bytes32);

    function MINTER_ROLE() external view returns (bytes32);

    function PAUSER_ROLE() external view returns (bytes32);

    function paymentToken() external view returns (IERC20);

    function UNDERLYING_TOKEN() external view returns (IERC20);

    function voter() external view returns (address);

    function mint(address _to, uint256 _amount) external;

    function exercise(uint256 _amount, uint256 _maxPaymentAmount, address _recipient) external returns (uint256);

    function exercise(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient,
        uint256 _deadline
    ) external returns (uint256);

    function exerciseVe(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient,
        uint256 _discount,
        uint256 _deadline
    ) external returns (uint256, uint256);

    function exerciseLp(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        uint256 _maxLPAmount,
        address _recipient,
        uint256 _discount,
        uint256 _deadline
    ) external returns (uint256, uint256);

    function exerciseExternal(
        IOption _option,
        uint256 _amount,
        uint256 _deadline,
        bytes calldata _data
    ) external returns (uint256);

    function getVotingEscrow() external view returns (address votingEscrow);

    function getLockDurationForVeDiscount(uint256 _discount) external view returns (uint256 duration);

    function getSlopeInterceptForVeDiscount() external view returns (int256 slope, int256 intercept);

    function togglePermissionedMint() external;

    function toggleOption(address option, bool enabled) external;

    function getDiscountedPrice(uint256 _amount) external view returns (uint256);

    function getDiscountedPrice(uint256 _amount, uint256 _discount) external view returns (uint256);

    function getLockDurationForLpDiscount(uint256 _amount) external view returns (uint256);

    function getPaymentTokenAmountForExerciseLp(
        uint256 _amount,
        uint256 _discount
    ) external view returns (uint256, uint256);

    function getSlopeInterceptForLpDiscount() external view returns (int256, int256);

    function getTimeWeightedAveragePrice(uint256 _amount) external view returns (uint256);

    function setTwapOracleAndPaymentToken(IDynamicTwapOracle _twapOracle, address _paymentToken) external;

    function setPairAndPaymentToken(IPair _pair, address _paymentToken) external;

    function setFeeDistributor(IOptionFeeDistributor _feeDistributor) external;

    function setDiscount(uint256 _discount) external;

    function setVeDiscount(uint256 _veDiscount) external;

    function setMinLPDiscount(uint256 _lpMinDiscount) external;

    function setMaxLPDiscount(uint256 _lpMaxDiscount) external;

    function setLockDurationForMaxLpDiscount(uint256 _duration) external;

    function setLockDurationForMinLpDiscount(uint256 _duration) external;

    function setTwapSeconds(uint32 _twapSeconds) external;

    function burn(uint256 _amount) external;

    function updateGauge() external;

    function setGauge(address _gauge) external;

    function setRouter(address _router) external;

    function unPause() external;

    function pause() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IPair {
    function metadata() external view returns (uint dec0, uint dec1, uint r0, uint r1, bool st, address t0, address t1);
    function claimFees() external returns (uint, uint);
    function tokens() external view returns (address, address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function fees() external view returns (address);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function burn(address to) external returns (uint amount0, uint amount1);
    function mint(address to) external returns (uint liquidity);
    function getReserves() external view returns (uint _reserve0, uint _reserve1, uint _blockTimestampLast);
    function getAmountOut(uint amountIn, address tokenIn) external view returns (uint);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function totalSupply() external view returns (uint);
    function decimals() external view returns (uint8);

    function claimable0(address _user) external view returns (uint);
    function claimable1(address _user) external view returns (uint);

    function isStable() external view returns (bool);

    function quote(address tokenIn, uint amountIn, uint granularity) external view returns (uint amountOut);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IPermissionsRegistry {
    function adminMultisig() external view returns (address);

    function teamMultisig() external view returns (address);

    function emergencyCouncil() external view returns (address);

    /// @notice Check if an address has a bytes role
    function hasRole(bytes memory role, address caller) external view returns (bool);

    /// @notice Check if an address has a role
    function hasRoleString(string memory role, address _user) external view returns (bool);

    /// @notice Read roles and return array of role strings
    function rolesToString() external view returns (string[] memory __roles);

    /// @notice Read roles return an array of roles in bytes
    function roles() external view returns (bytes[] memory);

    /// @notice Read the number of roles
    function rolesLength() external view returns (uint);

    /// @notice Return addresses for a given role
    function roleToAddresses(string memory role) external view returns (address[] memory _addresses);

    /// @notice Return roles for a given address
    function addressToRole(address _user) external view returns (string[] memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IRewardsDistributor {
    function checkpoint_token() external;
    function voting_escrow() external view returns (address);
    function checkpoint_total_supply() external;
    function claimable(uint _tokenId) external view returns (uint);
    function claim(uint _tokenId) external returns (uint);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IVersionable {
    function VERSION() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title IVoterV5_ClaimHelper
 * @notice Interface to claim rewards from LP gauges and bribes from VoterV5
 */
interface IVoterV5_ClaimHelper {
    /// @notice claim LP gauge rewards
    function claimRewards(address[] memory _gauges) external;

    /// @notice claim LP gauge rewards for a given address
    function claimRewardsFor(address[] memory _gauges, address _claimFor) external;

    /// @notice claim specific reward tokens from LP gauges
    function claimRewardTokens(address[] memory _gauges, address[][] memory _tokens) external;

    /// @notice claim specific reward tokens from LP gauges for a given address
    function claimRewardTokensFor(address[] memory _gauges, address[][] memory _tokens, address _claimFor) external;

    /// @notice claim bribes rewards given a TokenID
    function claimBribes(address[] memory _bribes, address[][] memory _tokens, uint256 _tokenId) external;

    /// @notice claim fees rewards given a TokenID
    function claimFees(address[] memory _fees, address[][] memory _tokens, uint256 _tokenId) external;

    /// @notice claim bribes rewards given an address
    function claimBribes(address[] memory _bribes, address[][] memory _tokens) external;

    /// @notice claim fees rewards given an address
    function claimFees(address[] memory _fees, address[][] memory _tokens) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC165} from "@openzeppelin/contracts/interfaces/IERC165.sol";

/// @title IVoterV5_GaugeLogic
interface IVoterV5_GaugeLogic is IERC165 {
    function createGauge(
        address _pool,
        uint256 _gaugeType
    ) external returns (address _gauge, address _internal_bribe, address _external_bribe);

    function isValidGaugeType(uint256 _gaugeType) external pure returns (bool);

    function MAX_GAUGE_TYPE() external pure returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IVoterV5_GaugeLogic} from "./IVoterV5_GaugeLogic.sol";
import {IVoterV5_ClaimHelper} from "./IVoterV5_ClaimHelper.sol";
import {IBribe} from "../IBribe.sol";
import {IGauge} from "../IGauge.sol";
import {IOptionTokenV3} from "../IOptionTokenV3.sol";
import {IMinter} from "../IMinter.sol";
import {IPermissionsRegistry} from "../IPermissionsRegistry.sol";
import {IVotingEscrowV2} from "../IVotingEscrowV2.sol";

/// @title IVoterV5_Logic
/// @notice Interface to manage the functionality of the VoterV5 contract
/// @custom:version 2.0.0
/// - Replace addFactory, removeFactory, replaceFactory with setFactory to support GaugeType enum
interface IVoterV5_Logic is IVoterV5_ClaimHelper {
    // Initialization
    function initialize(
        address __ve,
        address _pairFactory,
        address _gaugeFactory,
        address _bribes,
        address _gaugeLogic,
        string memory _protocolName
    ) external;

    function _init(address[] memory _tokens, address _permissionsRegistry, address _minter, address _oToken) external;

    // Role Management
    function setVoteDelay(uint256 _delay) external;

    function setMinter(address _minter) external;

    function setOptionsToken(address _oToken) external;

    function refreshApprovals(uint256 start, uint256 finish, address _oldOtoken) external;

    function setGaugeDepositor(address _depositor, bool _enabled) external;

    function setBribeFactory(address _bribeFactory) external;

    function setPermissionsRegistry(address _permissionRegistry) external;

    function setNewBribes(address _gauge, address _internal, address _external) external;

    function setInternalBribeFor(address _gauge, address _internal) external;

    function setExternalBribeFor(address _gauge, address _external) external;

    function setFactory(uint256 _gaugeType, address _pairFactory, address _gaugeFactory) external;

    // Governance
    function updateWhitelistToken(address[] memory _tokens, bool _whitelist) external;

    function updateWhitelistPool(address[] memory _pools, bool _whitelist) external;

    function killGauge(address _gauge) external;

    function reviveGauge(address _gauge) external;

    // User Interaction
    function reset() external;

    function poke() external;

    function vote(address[] calldata _poolVote, uint256[] calldata _weights) external;

    // Gauge Management
    function createGauges(
        address[] memory _pool,
        uint256[] memory _gaugeTypes
    ) external returns (address[] memory, address[] memory, address[] memory);

    function createGauge(
        address _pool,
        uint256 _gaugeType
    ) external returns (address _gauge, address _internal_bribe, address _external_bribe);

    // View Functions
    function length() external view returns (uint256);

    function poolVoteLength(address voter) external view returns (uint256);

    function factories() external view returns (address[] memory);

    function factoryLength() external view returns (uint256);

    function gaugeFactories() external view returns (address[] memory);

    function gaugeFactoriesLength() external view returns (uint256);

    function weights(address _pool) external view returns (uint256);

    function weightsAt(address _pool, uint256 _time) external view returns (uint256);

    function totalWeight() external view returns (uint256);

    function totalWeightAt(uint256 _time) external view returns (uint256);

    function _epochTimestamp() external view returns (uint256);

    function ve() external view returns (address);

    // Distribution
    function notifyRewardAmount(uint256 amount) external;

    function distributeFees(address[] memory _gauges) external;

    function distributeAll() external;

    function distribute(uint256 start, uint256 finish) external;

    function distribute(address[] memory _gauges) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IVoterV5_GaugeLogic} from "./IVoterV5_GaugeLogic.sol";

/// @title IVoterV5_Storage
/// @notice Interface for accessing public and external variables of the VoterV5_Storage contract
interface IVoterV5_Storage {
    /// @notice Returns the address of the ve token
    function _ve() external view returns (address);

    /// @notice Returns the address of the base token
    function base() external view returns (address);

    /// @notice Returns the address of the option token
    function oToken() external view returns (address);

    /// @notice Returns the address of the bribe factory
    function bribefactory() external view returns (address);

    /// @notice Returns the address of the minter
    function minter() external view returns (address);

    /// @notice Returns the address of the permission registry
    function permissionRegistry() external view returns (address);

    /// @notice Returns the address of a pool at a given index
    /// @param index The index of the pool in the pools array
    function pools(uint256 index) external view returns (address);

    /// @notice Returns the global gauge index
    function index() external view returns (uint256);

    /// @notice Returns the delay between votes in seconds
    function VOTE_DELAY() external view returns (uint256);

    /// @notice Returns the maximum vote delay allowed
    function MAX_VOTE_DELAY() external view returns (uint256);

    /// @notice Returns the claimable amount for a given account
    /// @param account The address of the account
    function claimable(address account) external view returns (uint256);

    /// @notice Returns the gauge address for a given pool
    /// @param pool The address of the pool
    function gauges(address pool) external view returns (address);

    /// @notice Returns the last distribution timestamp for a given gauge
    /// @param gauge The address of the gauge
    function gaugesDistributionTimestamp(address gauge) external view returns (uint256);

    /// @notice Returns the pool address for a given gauge
    /// @param gauge The address of the gauge
    function poolForGauge(address gauge) external view returns (address);

    /// @notice Returns the internal bribe address for a given gauge
    /// @param gauge The address of the gauge
    function internal_bribes(address gauge) external view returns (address);

    /// @notice Returns the external bribe address for a given gauge
    /// @param gauge The address of the gauge
    function external_bribes(address gauge) external view returns (address);

    /// @notice Returns the votes for a given NFT and pool
    /// @param nft The address of the NFT
    /// @param pool The address of the pool
    function votes(address nft, address pool) external view returns (uint256);

    /// @notice Returns the pool address at a given index for a given NFT
    /// @param nft The address of the NFT
    /// @param index The index of the pool in the poolVote array
    function poolVote(address nft, uint256 index) external view returns (address);

    /// @notice Returns the timestamp of the last vote for a given NFT
    /// @param nft The address of the NFT
    function lastVoted(address nft) external view returns (uint256);

    /// @notice Returns whether a given address is a gauge
    /// @param gauge The address of the gauge
    function isGauge(address gauge) external view returns (bool);

    /// @notice Returns whether a given token is whitelisted
    /// @param token The address of the token
    function isWhitelisted(address token) external view returns (bool);

    /// @notice Returns whether a given pool is whitelisted
    /// @param token The address of the pool token
    function isWhitelistedPool(address token) external view returns (bool);

    /// @notice Returns whether a given gauge is alive
    /// @param gauge The address of the gauge
    function isAlive(address gauge) external view returns (bool);

    /// @notice Returns the factory status of a given address
    /// @param factory The address of the factory
    function isFactory(address factory) external view returns (uint8);

    /// @notice Returns whether a given address is a gauge factory
    /// @param gaugeFactory The address of the gauge factory
    /// @dev in 5.4.1, this returns a uint8 instead of a bool
    ///      This allows the same gauge factory to be used across multiple gauge types.
    ///      Storage-safe: bool and uint8 both occupy 1 byte, existing true/false values
    ///      become 1/0 counters seamlessly during upgrades.
    function isGaugeFactory(address gaugeFactory) external view returns (uint8);

    /// @notice Returns whether a given address is a gauge depositor
    /// @param gaugeFactory The address of the gauge factory
    function isGaugeDepositor(address gaugeFactory) external view returns (bool);

    /// @notice Returns the address of the gauge logic contract
    function gaugeLogic() external view returns (IVoterV5_GaugeLogic);

    /// @notice Returns the epoch timestamp when a given gauge was killed
    /// @param gauge The address of the gauge
    function gaugeKilledEpoch(address gauge) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IVoterV5_Logic} from "./IVoterV5_Logic.sol";
import {IVoterV5_Storage} from "./IVoterV5_Storage.sol";

/// @title IVoterV5
/// @dev This interface is a composition of the IVoterV5_Logic and IVoterV5_Storage interfaces.
/// By composing these two interfaces, any contract that integrates IVoterV5 gains access to both the logic operations
/// and storage getters defined in IVoterV5_Logic and IVoterV5_Storage respectively. This design also
/// circumvents the need for the VoterV5_GaugeLogic to be abstract, as it separates the concerns of
/// logic handling and state management into distinct interfaces.
interface IVoterV5 is IVoterV5_Logic, IVoterV5_Storage {}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (governance/utils/IVotes.sol)
pragma solidity ^0.8.0;

/**
 * @dev Common interface for {ERC20Votes}, {ERC721Votes}, and other {Votes}-enabled contracts.
 *
 * _Available since v4.5._
 */
interface IVotes {
    /**
     * @dev Emitted when an account changes their delegate.
     */
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /**
     * @dev Emitted when a token transfer or delegate change results in changes to a delegate's number of votes.
     */
    event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

    /**
     * @dev Returns the current amount of votes that `account` has.
     */
    function getVotes(address account) external view returns (uint256);

    /**
     * @dev Returns the amount of votes that `account` had at a specific moment in the past. If the `clock()` is
     * configured to use block numbers, this will return the value at the end of the corresponding block.
     */
    function getPastVotes(address account, uint256 timepoint) external view returns (uint256);

    /**
     * @dev Returns the total supply of votes available at a specific moment in the past. If the `clock()` is
     * configured to use block numbers, this will return the value at the end of the corresponding block.
     *
     * NOTE: This value is the sum of all available votes, which is not necessarily the sum of all delegated votes.
     * Votes that have not been delegated are still part of total supply, even though they would not participate in a
     * vote.
     */
    function getPastTotalSupply(uint256 timepoint) external view returns (uint256);

    /**
     * @dev Returns the delegate that `account` has chosen.
     */
    function delegates(address account) external view returns (address);

    /**
     * @dev Delegates votes from the sender to `delegatee`.
     */
    function delegate(address delegatee) external;

    /**
     * @notice Removed from the interface to avoid signature conflicts.
     * @dev Delegates votes from signer to `delegatee`.
     */
    // function delegateBySig(address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IVotes} from "./IVotes.sol";
import {ICheckpoints} from "./ICheckpoints.sol";
import {IERC5725_ExtendedApproval} from "./IERC5725Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC721EnumerableUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol";
import {IVersionable} from "./IVersionable.sol";

/**
 * @title Voting Escrow V2 Interface for Upgrades
 */
interface IVotingEscrowV2 is IVotes, IERC5725_ExtendedApproval, IERC721EnumerableUpgradeable, IVersionable {
    struct LockDetails {
        uint256 amount; /// @dev amount of tokens locked
        uint256 startTime; /// @dev when locking started
        uint256 endTime; /// @dev when locking ends
        bool isPermanent; /// @dev if its a permanent lock
    }

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------

    event SupplyUpdated(uint256 oldSupply, uint256 newSupply);
    /// @notice Lock events
    event LockCreated(uint256 indexed tokenId, address indexed to, uint256 value, uint256 unlockTime, bool isPermanent);
    event LockUpdated(uint256 indexed tokenId, uint256 value, uint256 unlockTime, bool isPermanent);
    event LockMerged(
        uint256 indexed fromTokenId,
        uint256 indexed toTokenId,
        uint256 totalValue,
        uint256 unlockTime,
        bool isPermanent
    );
    event LockSplit(uint256[] splitWeights, uint256 indexed _tokenId);
    event LockDurationExtended(uint256 indexed tokenId, uint256 newUnlockTime, bool isPermanent);
    event LockAmountIncreased(uint256 indexed tokenId, uint256 value);
    event UnlockPermanent(uint256 indexed tokenId, address indexed sender, uint256 unlockTime);
    /// @notice Delegate events
    event LockDelegateChanged(
        uint256 indexed tokenId,
        address indexed delegator,
        address fromDelegate,
        address indexed toDelegate
    );

    /// -----------------------------------------------------------------------
    /// Errors
    /// -----------------------------------------------------------------------

    error AlreadyVoted();
    error InvalidNonce();
    error InvalidDelegatee();
    error InvalidSignature();
    error InvalidSignatureS();
    error InvalidWeights();
    error LockDurationNotInFuture();
    error LockDurationTooLong();
    error LockExpired();
    error LockNotExpired();
    error LockHoldsValue();
    error LockModifiedDelay();
    error NotPermanentLock();
    error PermanentLock();
    error PermanentLockMismatch();
    error SameNFT();
    error SignatureExpired();
    error ZeroAmount();
    error NotLockOwner();

    function supply() external view returns (uint);

    function token() external view returns (IERC20Upgradeable);

    function totalNftsMinted() external view returns (uint256);

    function balanceOfNFT(uint256 _tokenId) external view returns (uint256);

    function balanceOfNFTAt(uint256 _tokenId, uint256 _timestamp) external view returns (uint256);

    function delegates(uint256 tokenId, uint48 timestamp) external view returns (address);

    function lockDetails(uint256 tokenId) external view returns (LockDetails calldata);

    function getPastEscrowPoint(
        uint256 _tokenId,
        uint256 _timePoint
    ) external view returns (ICheckpoints.Point memory, uint48);

    function getFirstEscrowPoint(uint256 _tokenId) external view returns (ICheckpoints.Point memory, uint48);

    function checkpoint() external;

    function increaseAmount(uint256 _tokenId, uint256 _value) external;

    function increaseUnlockTime(uint256 _tokenId, uint256 _lockDuration, bool _permanent) external;

    function createLockFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to,
        bool _permanent
    ) external returns (uint256);

    function createDelegatedLockFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to,
        address _delegatee,
        bool _permanent
    ) external returns (uint256);

    function split(uint256[] memory _weights, uint256 _tokenId) external;

    function merge(uint256 _from, uint256 _to) external;

    function burn(uint256 _tokenId) external;

    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IVotingEscrowVault {
    function rewardOutputToken() external view returns (address);
    function notifyReward(uint256 amount) external;
    function enableRedeem() external;
    function disableRedeem() external;
    function lastTimeRewardApplicable() external view returns (uint256);
    function rewardForDuration() external view returns (uint256);
    function getPeriodFinish() external view returns (uint256);
    function left() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library CallLib {
    /**
     * @dev Handles the result of a call and reverts with the revert reason if the call failed.
     * @param success The success flag returned by the call.
     * @param result The result bytes returned by the call.
     * @return The result bytes if the call was successful.
     */
    function handleCallResult(bool success, bytes memory result) internal pure returns (bytes memory) {
        if (success) {
            return result;
        } else {
            // If the result length is less than 68, then the transaction failed silently (without a revert reason)
            if (result.length < 68) revert("call failed without a revert reason");

            assembly {
                // Slice the sighash to remove the function selector
                result := add(result, 0x04)
            }
            // All that remains is the revert string
            revert(abi.decode(result, (string)));
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IVotingEscrowV2.sol";

/**
 * @title VeHelper
 * @notice Library for voting escrow operations
 * @dev Provides stateless utility functions for VE token management
 */
library VeHelper {
    using SafeERC20 for IERC20;

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------

    event LockCreated(address indexed veToken, uint256 indexed tokenId, uint256 amount, uint256 unlockTime);
    event LockIncreased(address indexed veToken, uint256 indexed tokenId, uint256 amount);
    event VeNftMerged(address indexed veToken, uint256 indexed fromTokenId, uint256 indexed toTokenId);
    event VeNftSplit(address indexed veToken, uint256 indexed fromTokenId, uint256 newTokenId, uint256 splitAmount);
    event VeNftBurned(address indexed veToken, uint256 indexed tokenId, uint256 releasedAmount);

    /// -----------------------------------------------------------------------
    /// Errors
    /// -----------------------------------------------------------------------

    error InvalidAmount();
    error InvalidTokenId();
    error InsufficientBalance();
    error SplitFailed();
    error MergeFailed();
    error CannotBurnNftWithLockedAmount();

    /// -----------------------------------------------------------------------
    /// Core VE Operations
    /// -----------------------------------------------------------------------

    /**
     * @notice Create a new VE lock
     * @param veToken Address of the VE token contract
     * @param underlyingToken Address of the underlying token
     * @param amount Amount of tokens to lock
     * @param unlockTime Unlock timestamp
     * @return tokenId The created token ID
     */
    function createLock(
        IVotingEscrowV2 veToken,
        address underlyingToken,
        uint256 amount,
        uint256 unlockTime,
        bool permanent
    ) internal returns (uint256 tokenId) {
        if (amount == 0) revert InvalidAmount();

        // Approve and create lock
        IERC20(underlyingToken).safeApprove(address(veToken), 0);
        IERC20(underlyingToken).safeApprove(address(veToken), amount);

        tokenId = veToken.createLockFor(amount, unlockTime, address(this), permanent);

        emit LockCreated(address(veToken), tokenId, amount, unlockTime);
    }

    /**
     * @notice Increase the amount of an existing VE lock
     * @param veToken Address of the VE token contract
     * @param underlyingToken Address of the underlying token
     * @param tokenId Token ID to increase
     * @param amount Amount to add to the lock
     */
    function increaseAmount(
        IVotingEscrowV2 veToken,
        address underlyingToken,
        uint256 tokenId,
        uint256 amount
    ) internal {
        if (amount == 0) revert InvalidAmount();
        if (tokenId == 0) revert InvalidTokenId();

        // Approve and increase amount
        IERC20(underlyingToken).safeApprove(address(veToken), 0);
        IERC20(underlyingToken).safeApprove(address(veToken), amount);

        veToken.increaseAmount(tokenId, amount);

        emit LockIncreased(address(veToken), tokenId, amount);
    }

    /**
     * @notice Permanently lock a VE token
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to permanently lock
     * @dev Note: This function may not be supported by all VE implementations
     */
    function lockPermanent(IVotingEscrowV2 veToken, uint256 tokenId) internal {
        if (tokenId == 0) revert InvalidTokenId();

        veToken.increaseUnlockTime(tokenId, 0, true);
    }

    /**
     * @notice Split a VE NFT and send the split portion to a recipient
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to split
     * @param splitAmount Amount to split off
     * @param recipient Address to receive the split NFT
     * @return newTokenId The ID of the newly created split NFT
     */
    function splitAndSend(
        IVotingEscrowV2 veToken,
        uint256 tokenId,
        uint256 splitAmount,
        address recipient
    ) internal returns (uint256 newTokenId) {
        if (tokenId == 0) revert InvalidTokenId();
        if (splitAmount == 0) revert InvalidAmount();

        uint256 totalNftsBefore = veToken.balanceOf(address(this));

        // Use actual locked amount, not voting power
        uint256 totalBalance = veToken.lockDetails(tokenId).amount;

        if (splitAmount > totalBalance) revert InsufficientBalance();

        uint256 remainingBalance = totalBalance - splitAmount;

        uint256[] memory amounts = new uint256[](2);
        amounts[0] = remainingBalance;
        amounts[1] = splitAmount;

        // Split the NFT
        veToken.split(amounts, tokenId);

        uint256 totalNftsAfter = veToken.balanceOf(address(this));
        if (totalNftsAfter != totalNftsBefore + 1) revert SplitFailed();

        // Get the new split token ID (should be the last one)
        newTokenId = veToken.tokenOfOwnerByIndex(address(this), totalNftsAfter - 1);

        // Transfer the split NFT to recipient
        veToken.transferFrom(address(this), recipient, newTokenId);

        emit VeNftSplit(address(veToken), tokenId, newTokenId, splitAmount);
    }

    /**
     * @notice Burn a VE NFT (only works if lock amount is 0)
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to burn
     * @dev NFT can only be burned when lockDetails.amount == 0
     */
    function burnNft(IVotingEscrowV2 veToken, uint256 tokenId) internal {
        if (tokenId == 0) revert InvalidTokenId();

        // Verify that the NFT has no locked amount before burning
        IVotingEscrowV2.LockDetails memory lockDetails = veToken.lockDetails(tokenId);
        if (lockDetails.amount > 0) revert CannotBurnNftWithLockedAmount();

        // Burn the empty NFT
        veToken.burn(tokenId);

        emit VeNftBurned(address(veToken), tokenId, 0);
    }

    /// -----------------------------------------------------------------------
    /// View Functions
    /// -----------------------------------------------------------------------

    /**
     * @notice Get the actual locked token amount for a VE NFT (not voting power)
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to query
     * @return amount Actual locked token amount
     */
    function getLockedAmount(IVotingEscrowV2 veToken, uint256 tokenId) internal view returns (uint256 amount) {
        if (tokenId == 0) return 0;
        return veToken.lockDetails(tokenId).amount;
    }

    /**
     * @notice Get lock details for a VE NFT
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to query
     * @return lockDetails Lock details struct
     */
    function getLockDetails(
        IVotingEscrowV2 veToken,
        uint256 tokenId
    ) internal view returns (IVotingEscrowV2.LockDetails memory lockDetails) {
        if (tokenId == 0) {
            return IVotingEscrowV2.LockDetails(0, 0, 0, false);
        }
        return veToken.lockDetails(tokenId);
    }

    /**
     * @notice Check if a VE NFT is owned by the given address
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to check
     * @param owner Address to check ownership for
     * @return isOwner True if the address owns the NFT
     */
    function isOwner(IVotingEscrowV2 veToken, uint256 tokenId, address owner) internal view returns (bool) {
        if (tokenId == 0) return false;
        try veToken.ownerOf(tokenId) returns (address actualOwner) {
            return actualOwner == owner;
        } catch {
            return false;
        }
    }

    /**
     * @notice Get the VE voting power for a token ID at a specific epoch
     * @param veToken Address of the VE token contract
     * @param tokenId Token ID to query
     * @param epoch Epoch timestamp to get voting power for
     * @return votingPower Voting power of the NFT at the specified epoch
     */
    function getVotingPower(
        IVotingEscrowV2 veToken,
        uint256 tokenId,
        uint256 epoch
    ) internal view returns (uint256 votingPower) {
        if (tokenId == 0) return 0;
        address owner = veToken.ownerOf(tokenId);
        return veToken.getPastVotes(owner, epoch);
    }

    /**
     * @notice Get the underlying token address for a VE token
     * @param veToken Address of the VE token contract
     * @return underlyingToken Address of the underlying token
     */
    function getUnderlyingToken(IVotingEscrowV2 veToken) internal view returns (address underlyingToken) {
        return address(veToken.token());
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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