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// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity ^0.8.0;

import "../interfaces/token/IERC20.sol";
import "../interfaces/master/IFeeRegistry.sol";
import "../interfaces/master/IFeeRecipient.sol";

import "../libraries/Ownable2Step.sol";
import "../libraries/TransferHelper.sol";

error InvalidFeeSender();

contract SyncSwapFeeRecipient is IFeeRecipient, Ownable2Step {

    uint public epochDuration = 1 days;

    /// @dev The registry for fee senders.
    address public feeRegistry;

    /// @dev The epoch fees of each token.
    mapping(uint => mapping(address => uint)) public fees; // epoch => token => amount

    /// @dev The fees tokens in each epoch.
    mapping(uint => address[]) public feeTokens;

    /// @dev Whether the address is a fee distributor.
    mapping(address => bool) public isFeeDistributor;

    /// @dev The fee distributors.
    address[] public feeDistributors; // for inspection only

    struct FeeTokenData {
        // The start time of a fee token from a sender.
        uint startTime;

        // The accumulated fee amount since start time.
        uint amount;
    }

    /// @dev The fee token data of a sender.
    mapping(address => mapping(address => FeeTokenData)) public feeTokenData; // sender => token => time

    event NotifyFees(address indexed sender, uint16 indexed feeType, address indexed token, uint amount, uint feeRate);
    event AddFeeDistributor(address indexed distributor);
    event RemoveFeeDistributor(address indexed distributor);
    event SetFeeRegistry(address indexed feeRegistry);
    event SetEpochDuration(uint epochDuration);

    constructor(address _feeRegistry) {
        feeRegistry = _feeRegistry;
    }

    function feeTokensLength(uint epoch) external view returns (uint) {
        return feeTokens[epoch].length;
    }

    function feeDistributorsLength() external view returns (uint) {
        return feeDistributors.length;
    }

    function getEpochStart(uint ts) public view returns (uint) {
        return ts - (ts % epochDuration);
    }

    /// @dev Notifies the fee recipient after sent fees.
    function notifyFees(
        uint16 feeType,
        address token,
        uint amount,
        uint feeRate,
        bytes calldata /*data*/
    ) external override {
        if (!IFeeRegistry(feeRegistry).isFeeSender(msg.sender)) {
            revert InvalidFeeSender();
        }

        uint epoch = getEpochStart(block.timestamp);
        uint epochTokenFees = fees[epoch][token];

        // Unchecked to avoid potential overflow, since fees are only for inspection.
        unchecked {
            if (epochTokenFees == 0) {
                // Pushes new tokens to array.
                feeTokens[epoch].push(token);

                // Updates epoch fees for the token.
                fees[epoch][token] = amount;

                // Updates fee token data for sender.
                feeTokenData[msg.sender][token] = FeeTokenData({
                    startTime: block.timestamp,
                    amount: amount
                });
            } else {
                // Updates epoch fees for the token.
                fees[epoch][token] = (epochTokenFees + amount);

                // Updates fee token data for sender.
                feeTokenData[msg.sender][token].amount += amount;
            }
        }

        emit NotifyFees(msg.sender, feeType, token, amount, feeRate);
    }

    /// @dev Distributes fees to the recipient.
    function distributeFees(address to, address[] calldata tokens, uint[] calldata amounts) external {
        require(isFeeDistributor[msg.sender] || msg.sender == owner(), "No perms");
        require(tokens.length == amounts.length, "Wrong length");

        uint n = tokens.length;
        address token; uint amount;

        for (uint i; i < n; ) {
            token = tokens[i];
            amount = amounts[i];

            if (token == address(0)) { // ETH
                if (amount == 0) {
                    amount = address(this).balance;
                }
                TransferHelper.safeTransferETH(to, amount);
            } else {
                if (amount == 0) {
                    amount = IERC20(token).balanceOf(address(this));
                }
                TransferHelper.safeTransfer(token, to, amount);
            }

            unchecked {
                ++i;
            }
        }
    }

    /// @dev Adds a new fee distributor.
    function addFeeDistributor(address distributor) external onlyOwner {
        require(distributor != address(0), "Invalid address");
        require(!isFeeDistributor[distributor], "Already set");
        isFeeDistributor[distributor] = true;
        feeDistributors.push(distributor);
        emit AddFeeDistributor(distributor);
    }

    /// @dev Removes a new fee distributor.
    function removeFeeDistributor(address distributor, bool updateArray) external onlyOwner {
        require(isFeeDistributor[distributor], "Not set");
        delete isFeeDistributor[distributor];
        if (updateArray) {
            uint n = feeDistributors.length;
            for (uint i; i < n; ) {
                if (feeDistributors[i] == distributor) {
                    feeDistributors[i] = feeDistributors[n - 1];
                    feeDistributors[n - 1] = distributor;
                    feeDistributors.pop();
                    break;
                }

                unchecked {
                    ++i;
                }
            }
        }
        emit RemoveFeeDistributor(distributor);
    }

    /// @dev Sets a new fee registry.
    function setFeeRegistry(address _feeRegistry) external onlyOwner {
        require(_feeRegistry != address(0), "Invalid address");
        feeRegistry = _feeRegistry;
        emit SetFeeRegistry(_feeRegistry);
    }

    function setEpochDuration(uint _epochDuration) external onlyOwner {
        require(_epochDuration != 0, "Invalid duration");
        epochDuration = _epochDuration;
        emit SetEpochDuration(_epochDuration);
    }

    function withdrawERC20(address token, address to, uint amount) external onlyOwner {
        if (amount == 0) {
            amount = IERC20(token).balanceOf(address(this));
        }
        TransferHelper.safeTransfer(token, to, amount);
    }

    function withdrawETH(address to, uint amount) external onlyOwner {
        if (amount == 0) {
            amount = address(this).balance;
        }
        TransferHelper.safeTransferETH(to, amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IFeeRecipient {
    /// @dev Notifies the fee recipient after sent fees.
    function notifyFees(
        uint16 feeType,
        address token,
        uint amount,
        uint feeRate,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IFeeRegistry {
    function isFeeSender(address sender) external view returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

import "./IERC20Base.sol";

interface IERC20 is IERC20Base {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IERC20Base {
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint amount) external returns (bool);
    function transfer(address to, uint amount) external returns (bool);
    function transferFrom(address from, address to, uint amount) external returns (bool);
    
    event Approval(address indexed owner, address indexed spender, uint amount);
    event Transfer(address indexed from, address indexed to, uint amount);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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 Ownable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(msg.sender);
    }

    /**
     * @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() == msg.sender, "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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        require(pendingOwner() == msg.sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(msg.sender);
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity ^0.8.0;

/// @dev The ETH transfer has failed.
error ETHTransferFailed();

/// @dev The ERC20 `transferFrom` has failed.
error TransferFromFailed();

/// @dev The ERC20 `transfer` has failed.
error TransferFailed();

/// @dev The ERC20 `approve` has failed.
error ApproveFailed();

/// @dev Helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true / false.
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("approve(address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ApproveFailed();
        }
    }

    function safeTransfer(
        address token,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("transfer(address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert TransferFailed();
        }
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("transferFrom(address,address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert TransferFromFailed();
        }
    }

    function safeTransferETH(address to, uint value) internal {
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = to.call{value: value}("");

        if (!success) {
            revert ETHTransferFailed();
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {
      "yul": false
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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0000000000000000000000008cdf4ec0d5ee197b00467a720660c44480b3ec60

-----Decoded View---------------
Arg [0] : _feeRegistry (address): 0x8cDf4Ec0D5ee197B00467A720660C44480B3Ec60

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000008cdf4ec0d5ee197b00467a720660c44480b3ec60