// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";

/// @title LINEABOLStaking (Fixed APR model)
/// @notice Staking with a fixed APR determined when owner notifies a reward amount.
/// @dev Rewards are computed as if `maxTotalStake` were staked. If fewer tokens are staked,
///      some rewards remain undistributed and can be reclaimed or rolled over.
contract LINEABOLStaking is ReentrancyGuard, Ownable, Pausable {
    using SafeERC20 for IERC20;

    IERC20 public stakeToken;
    IERC20 public rewardToken;

    uint8 public stakeTokenDecimals;
    uint8 public rewardTokenDecimals;

    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;

    // Reward accounting
    uint256 public rewardPerTokenStored;
    uint256 public lastUpdateTime;
    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    // reward rate (reward tokens / second) derived from notifyRewardAmount (reward/duration)
    uint256 public rewardRate;
    uint256 public periodFinish;

    uint256 public lastRewardAmount;
    uint256 public rewardDuration;
    uint256 public distributedRewards; // amount of rewardToken actually paid out to users (monotonic across a cycle)

    uint256 private constant PRECISION = 1e18;

    // Pool caps & limits
    uint256 public maxStakePerUser = 100_000 * 1e18;
    uint256 public maxTotalStake = type(uint256).max;

    // Cooldown
    uint256 public cooldownPeriod = 72 hours;
    struct WithdrawalRequest {
        uint256 amount;
        uint256 unlockTime;
    }
    mapping(address => WithdrawalRequest) public withdrawalRequests;

    // Events
    event Staked(address indexed user, uint256 amount);
    event WithdrawRequested(address indexed user, uint256 amount, uint256 unlockTime);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardAdded(uint256 reward, uint256 newRate);
    event EmergencyWithdrawn(address indexed user, uint256 amount);
    event CooldownPeriodUpdated(uint256 newCooldownPeriod);
    event StakeTokenUpdated(address indexed newStakeToken, uint8 decimals);
    event RewardTokenUpdated(address indexed newRewardToken, uint8 decimals);
    event MaxStakePerUserUpdated(uint256 newMaxStake);
    event MaxTotalStakeUpdated(uint256 newMaxTotalStake);
    event UndistributedReclaimed(address indexed to, uint256 amount);
    event RolledOverRewards(uint256 amount, uint256 duration);

    constructor(address _stakeToken, address _rewardToken) Ownable(msg.sender) {
        require(_stakeToken != address(0) && _rewardToken != address(0), "Zero address");
        stakeToken = IERC20(_stakeToken);
        rewardToken = IERC20(_rewardToken);
        stakeTokenDecimals = _getTokenDecimals(_stakeToken);
        rewardTokenDecimals = _getTokenDecimals(_rewardToken);
        lastUpdateTime = block.timestamp;
    }

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    function setMaxStakePerUser(uint256 _max) external onlyOwner {
        require(_max > 0, "Invalid max");
        require(_max <= 500_000 * 1e18, "Cannot exceed 500k tokens");
        maxStakePerUser = _max;
        emit MaxStakePerUserUpdated(_max);
    }

    function setMaxTotalStake(uint256 _maxTotal) external onlyOwner {
        require(_maxTotal > 0, "Invalid max total");
        maxTotalStake = _maxTotal;
        emit MaxTotalStakeUpdated(_maxTotal);
    }

    // VIEW helpers

    function lastTimeRewardApplicable() public view returns (uint256) {
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    /// @notice rewardPerToken uses maxTotalStake as the denominator to enforce fixed APR
    /// @dev If maxTotalStake is very large (e.g., type(uint256).max) the per-token accrual will be tiny.
    function rewardPerToken() public view returns (uint256) {
        if (lastUpdateTime == 0) return rewardPerTokenStored;
        uint256 applicable = lastTimeRewardApplicable();
        if (applicable <= lastUpdateTime) return rewardPerTokenStored;
        uint256 timeDelta = applicable - lastUpdateTime;

        // Use maxTotalStake as the baseline supply for fixed APR distribution
        uint256 denominator = maxTotalStake;
        if (denominator == 0) {
            return rewardPerTokenStored; // defensive; setMaxTotalStake prevents this normally
        }

        // rewardRate is reward / duration (tokens per second).
        // We compute how much reward-per-unit-stake accrues in this timeDelta:
        // delta = timeDelta * rewardRate / denominator
        // scaled by PRECISION
        uint256 delta = (timeDelta * rewardRate * PRECISION) / denominator;
        return rewardPerTokenStored + delta;
    }

    function earned(address account) public view returns (uint256) {
        return ((balanceOf[account] * (rewardPerToken() - userRewardPerTokenPaid[account])) / PRECISION) + rewards[account];
    }

    /// @notice APR fixed based on lastRewardAmount, rewardDuration and maxTotalStake.
    /// @dev APR returned as fixed-point 1e18 (e.g., 0.12e18 for 12%).
    function apr() public view returns (uint256) {
        if (rewardDuration == 0 || maxTotalStake == 0) return 0;
        // APR = (lastRewardAmount / maxTotalStake) * (seconds in year / rewardDuration)
        uint256 numerator = lastRewardAmount * 365 days * PRECISION;
        uint256 denominator = maxTotalStake * rewardDuration;
        return denominator == 0 ? 0 : (numerator / denominator);
    }

    function aprPercent() external view returns (uint256 whole, uint256 frac2) {
        uint256 a = apr(); // 1e18 precision
        uint256 percentTimes100 = (a * 100) / PRECISION; // e.g., 12.34% => 1234
        whole = percentTimes100 / 100;
        frac2 = percentTimes100 % 100;
    }

    // USER ACTIONS

    function stake(uint256 amount) external nonReentrant whenNotPaused updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");

        uint256 beforeBal = stakeToken.balanceOf(address(this));
        stakeToken.safeTransferFrom(msg.sender, address(this), amount);
        uint256 afterBal = stakeToken.balanceOf(address(this));
        uint256 received = afterBal - beforeBal;

        require(received > 0, "Nothing received");

        require(balanceOf[msg.sender] + received <= maxStakePerUser, "Exceeds max stake limit");
        require(totalSupply + received <= maxTotalStake, "Exceeds pool max total stake");

        totalSupply += received;
        balanceOf[msg.sender] += received;

        emit Staked(msg.sender, received);
    }

    function requestWithdraw(uint256 amount) external nonReentrant whenNotPaused updateReward(msg.sender) {
        require(amount > 0, "Cannot request 0");
        require(balanceOf[msg.sender] >= amount, "Not enough staked");
        require(withdrawalRequests[msg.sender].amount == 0, "Pending withdrawal exists");

        withdrawalRequests[msg.sender] = WithdrawalRequest({
            amount: amount,
            unlockTime: block.timestamp + cooldownPeriod
        });

        emit WithdrawRequested(msg.sender, amount, block.timestamp + cooldownPeriod);
    }

    function withdrawRequested() external nonReentrant whenNotPaused updateReward(msg.sender) {
        WithdrawalRequest memory req = withdrawalRequests[msg.sender];
        require(req.amount > 0, "No withdrawal");
        require(block.timestamp >= req.unlockTime || block.timestamp >= periodFinish, "Cooldown not finished");

        delete withdrawalRequests[msg.sender];

        balanceOf[msg.sender] -= req.amount;
        totalSupply -= req.amount;
        stakeToken.safeTransfer(msg.sender, req.amount);

        emit Withdrawn(msg.sender, req.amount);
    }

    function getReward() public nonReentrant whenNotPaused updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            distributedRewards += reward;
            rewardToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    // OWNER FUNCTIONS

    function setCooldownPeriod(uint256 _newCooldownPeriod) external onlyOwner {
        require(_newCooldownPeriod >= 1 hours && _newCooldownPeriod <= 7 days, "Invalid cooldown period");
        cooldownPeriod = _newCooldownPeriod;
        emit CooldownPeriodUpdated(_newCooldownPeriod);
    }

    /// @notice Owner provides the reward amount and duration. This establishes the fixed APR.
    /// @dev rewardRate = reward / duration (tokens per second). rewardPerToken() uses maxTotalStake.
    function notifyRewardAmount(uint256 reward, uint256 duration) public onlyOwner updateReward(address(0)) {
        require(reward > 0, "No reward");
        require(duration >= 1 days, "Duration too short");

        // Ensure contract has enough reward tokens available for distribution.
        uint256 contractBalance = rewardToken.balanceOf(address(this));
        if (address(rewardToken) == address(stakeToken)) {
            require(contractBalance >= totalSupply, "Invariant: contract balance less than totalSupply");
            uint256 available = contractBalance - totalSupply;
            require(available >= reward, "Insufficient reward tokens (after accounting for staked tokens)");
        } else {
            require(contractBalance >= reward, "Insufficient reward tokens");
        }

        // compute rewardRate as reward per second
        rewardRate = reward / duration;

        // bookkeeping
        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp + duration;
        lastRewardAmount = reward;
        rewardDuration = duration;
        distributedRewards = 0;

        emit RewardAdded(reward, rewardRate);
    }

    function depositRewards(uint256 amount) external onlyOwner {
        require(amount > 0, "Cannot deposit 0");
        rewardToken.safeTransferFrom(msg.sender, address(this), amount);
    }

    /// @notice Owner reclaims undistributed rewards after the period is finished.
    /// @dev leftover = lastRewardAmount - distributedRewards (bounded to zero)
    function reclaimUndistributedRewards(address to) external onlyOwner {
        require(block.timestamp >= periodFinish, "Period not finished");
        require(to != address(0), "Invalid to");

        uint256 leftover = 0;
        if (lastRewardAmount > distributedRewards) {
            leftover = lastRewardAmount - distributedRewards;
        }

        require(leftover > 0, "No leftover rewards");

        // adjust bookkeeping
        lastRewardAmount -= leftover;

        // if rewardToken == stakeToken, ensure not withdrawing staked tokens
        if (address(rewardToken) == address(stakeToken)) {
            uint256 contractBal = IERC20(address(stakeToken)).balanceOf(address(this));
            require(contractBal - leftover >= totalSupply, "Cannot withdraw staked tokens");
        }

        rewardToken.safeTransfer(to, leftover);

        emit UndistributedReclaimed(to, leftover);
    }

    /// @notice Rollover leftover undistributed rewards into a new cycle of newDuration.
    function rolloverUndistributedRewards(uint256 newDuration) external onlyOwner updateReward(address(0)) {
        require(block.timestamp >= periodFinish, "Period not finished");
        require(newDuration >= 1 days, "Duration too short");

        uint256 leftover = 0;
        if (lastRewardAmount > distributedRewards) {
            leftover = lastRewardAmount - distributedRewards;
        }
        require(leftover > 0, "No leftover to rollover");

        // reset counters for new cycle
        distributedRewards = 0;
        lastRewardAmount = 0;
        rewardDuration = 0;

        // Start new period with leftover
        notifyRewardAmount(leftover, newDuration);

        emit RolledOverRewards(leftover, newDuration);
    }

    function updateStakeToken(address _newStakeToken) external onlyOwner whenPaused {
        require(_newStakeToken != address(0), "Invalid address");
        require(totalSupply == 0, "Cannot update with active stakes");
        stakeToken = IERC20(_newStakeToken);
        stakeTokenDecimals = _getTokenDecimals(_newStakeToken);
        emit StakeTokenUpdated(_newStakeToken, stakeTokenDecimals);
    }

    function updateRewardToken(address _newRewardToken) external onlyOwner whenPaused {
        require(_newRewardToken != address(0), "Invalid address");
        rewardToken = IERC20(_newRewardToken);
        rewardTokenDecimals = _getTokenDecimals(_newRewardToken);
        emit RewardTokenUpdated(_newRewardToken, rewardTokenDecimals);
    }

    // INTERNAL / HELPERS

    function _getTokenDecimals(address token) internal view returns (uint8) {
        (bool success, bytes memory data) = token.staticcall{gas: 30000}(abi.encodeWithSignature("decimals()"));
        if (!success || data.length < 32) {
            return 18;
        }
        uint8 d = abi.decode(data, (uint8));
        return d;
    }

    function toSmallestUnit(uint256 amount, uint8 decimals_) public pure returns (uint256) {
        return amount * (10 ** decimals_);
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    function emergencyWithdrawERC20(address token, address to, uint256 amount) external onlyOwner {
        require(to != address(0), "Invalid to");
        if (token == address(stakeToken)) {
            uint256 contractBal = IERC20(token).balanceOf(address(this));
            require(contractBal - amount >= totalSupply, "Cannot withdraw staked tokens");
        }
        IERC20(token).safeTransfer(to, amount);
        emit EmergencyWithdrawn(to, amount);
    }

    // ===== View util: how much undistributed currently remains for the active cycle =====
    function undistributedAmount() external view returns (uint256) {
        if (lastRewardAmount <= distributedRewards) return 0;
        return lastRewardAmount - distributedRewards;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.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.
 *
 * The initial owner is set to the address provided by the deployer. 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 Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)

pragma solidity ^0.8.20;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.2.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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 Context {
    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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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 v5.0.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

{
  "evmVersion": "london",
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/"
  ]
}

• No Contract Security Audit Submitted- Submit Audit Here

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