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// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

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

contract BIFKN314Locker is Ownable(msg.sender), ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint256 public constant FEE_RATE = 100; // 1%
    uint256 public constant EXTEND_LOCK_DURATION_FEE_RATE = 50; // 0.5%
    address public feeTo;
    address public feeToSetter;

    /**
     * @dev Represents a locked  (Liquidity Provider) token.
     *
     * Each locked  token has the following properties:
     * - `token`: The address of the token being locked.
     * - `amount`: The amount of tokens being locked.
     * - `unlockTime`: The timestamp when the tokens can be unlocked.
     * - `owner`: The address of the user who owns the locked tokens.
     */
    struct LockedToken {
        IERC20 token;
        uint256 amount;
        uint256 unlockTime;
        uint256 totalLockDuration;
        address owner;
        uint256 lockId;
        bool claimed;
    }

    // Mapping from lock ID to the owner's address
    mapping(uint256 => address) public lockOwner;

    // Mapping from user address to an array of lock IDs
    mapping(address => uint256[]) public userLockIds;

    // Array to store all locks
    LockedToken[] public lockedTokens;

    event LockTokens(address indexed user, uint256 lockId, uint256 unlockTime);
    event ExtendLockDuration(
        address indexed user,
        uint256 lockId,
        uint256 additionalDuration
    );
    event ClaimUnlockedTokens(address indexed user, uint256 lockId);
    event TransferLockOwnership(
        uint256 indexed lockId,
        address indexed oldOwner,
        address indexed newOwner
    );

    error AmountMustBeGreaterThanZero();
    error InvalidLockId();
    error UnauthorizedLockId();
    error InvalidAddress(address address_);
    error OnlyFeeToSetter(address caller);
    error LockNotExpired(uint256 unlockTime, uint256 currentTime);
    error AlreadyClaimed();

    /**
     * @dev Modifier to restrict access to the `onlyFeeToSetter` function.
     * It ensures that only the `feeToSetter` address can execute the function.
     * Reverts with an error message if the caller is not the `feeToSetter`.
     */
    modifier onlyFeeToSetter() {
        if (_msgSender() != feeToSetter) revert OnlyFeeToSetter(_msgSender());
        _;
    }

    /**
     * @dev Initializes the contract with the specified feeTo and feeToSetter addresses.
     * @param _feeTo The address where the fees will be sent to.
     * @param _feeToSetter The address that is allowed to update the feeTo address.
     */
    constructor(address _feeTo, address _feeToSetter) {
        if (_feeTo == address(0)) {
            revert InvalidAddress(_feeTo);
        }
        if (_feeToSetter == address(0)) {
            revert InvalidAddress(_feeToSetter);
        }
        feeTo = _feeTo;
        feeToSetter = _feeToSetter;
    }

    /**
     * @dev Updates the feeTo address.
     * @param _feeTo The address where the fees will be sent to.
     */
    function setFeeTo(address _feeTo) external onlyFeeToSetter {
        if (_feeTo == address(0)) {
            revert InvalidAddress(_feeTo);
        }

        feeTo = _feeTo;
    }

    /**
     * @dev Updates the feeToSetter address.
     * @param _feeToSetter The address that is allowed to update the feeTo address.
     */
    function setFeeToSetter(address _feeToSetter) external onlyFeeToSetter {
        if (_feeToSetter == address(0)) {
            revert InvalidAddress(_feeToSetter);
        }

        feeToSetter = _feeToSetter;
    }

    /**
     * @dev Locks tokens in the contract for a specified duration.
     * @param _token The token to lock.
     * @param _amount The amount of tokens to lock.
     * @param _daysToLock The number of days to lock the tokens for.
     */
    function lockTokens(
        IERC20 _token,
        uint256 _amount,
        uint256 _daysToLock
    ) external nonReentrant {
        if (_amount == 0) {
            revert AmountMustBeGreaterThanZero();
        }
        if (_daysToLock == 0) {
            revert AmountMustBeGreaterThanZero();
        }
        address sender = _msgSender();

        uint256 unlockTime = block.timestamp + (_daysToLock * 1 days);
        uint256 fee = (_amount * FEE_RATE) / 10000; // 1% fee
        uint256 amountAfterFee = _amount - fee;

        uint256 lockId = lockedTokens.length; // Lock ID is the index of the lock in the array
        LockedToken memory newLock = LockedToken({
            token: _token,
            amount: amountAfterFee,
            unlockTime: unlockTime,
            totalLockDuration: _daysToLock,
            owner: sender,
            lockId: lockId,
            claimed: false
        });

        lockedTokens.push(newLock);
        userLockIds[sender].push(lockId);
        lockOwner[lockId] = sender;

        _token.safeTransferFrom(sender, feeTo, fee); // Transfer fee to feeTo address
        _token.safeTransferFrom(sender, address(this), amountAfterFee); // Transfer tokens to this contract

        emit LockTokens(sender, lockId, unlockTime);
    }

    /**
     * Allows users to extend the lock duration of specific locked tokens by ID.
     * @param _lockId The unique identifier of the locked position to extend.
     * @param _additionalDurationInDays The additional duration in days to extend the lock period.
     */
    function extendLockDuration(
        uint256 _lockId,
        uint256 _additionalDurationInDays
    ) public nonReentrant {
        if (_additionalDurationInDays == 0)
            revert AmountMustBeGreaterThanZero();

        address sender = _msgSender();

        if (_lockId >= lockedTokens.length) {
            revert InvalidLockId();
        }
        if (lockOwner[_lockId] != sender) {
            revert UnauthorizedLockId();
        }
        if (lockedTokens[_lockId].claimed) {
            revert AlreadyClaimed();
        }

        LockedToken storage lock = lockedTokens[_lockId];

        uint256 fee = (lock.amount * EXTEND_LOCK_DURATION_FEE_RATE) / 10000; // 0.5% fee
        // if the lock is already expired, the additional duration will be added to the current time
        if (block.timestamp >= lock.unlockTime) {
            lock.unlockTime =
                block.timestamp +
                (_additionalDurationInDays * 1 days);
            // if the lock is expired, duration can be extended for the original fee
            // This is to encourage users to extend the lock duration before the lock expires
            fee = (lock.amount * FEE_RATE) / 10000; // 1% fee
        } else {
            // if the lock is not expired, the additional duration will be added to the current unlock time
            // for the extend lock duration fee of 0.5%
            lock.unlockTime += (_additionalDurationInDays * 1 days);
        }

        // update the total lock duration
        lock.totalLockDuration += _additionalDurationInDays;
        lock.amount -= fee;
        lock.token.safeTransfer(feeTo, fee); // Transfer fee to feeTo address

        emit ExtendLockDuration(sender, _lockId, _additionalDurationInDays);
    }

    /**
     * @dev Allows the lock owner to claim unlocked tokens.
     * @param _lockId The ID of the lock.
     */
    function claimUnlockedTokens(uint256 _lockId) public nonReentrant {
        address sender = _msgSender();

        if (_lockId >= lockedTokens.length) {
            revert InvalidLockId();
        }
        if (lockOwner[_lockId] != sender) {
            revert UnauthorizedLockId();
        }
        if (lockedTokens[_lockId].claimed) {
            revert AlreadyClaimed();
        }
        LockedToken storage lock = lockedTokens[_lockId];

        if (block.timestamp < lock.unlockTime) {
            revert LockNotExpired(lock.unlockTime, block.timestamp);
        }

        if (block.timestamp >= lock.unlockTime) {
            lockOwner[_lockId] = address(0);
            lock.claimed = true;
            lock.token.safeTransfer(sender, lock.amount);

            emit ClaimUnlockedTokens(sender, _lockId);
        }
    }

    /**
     * @dev Claims all unlocked tokens for the caller.
     * This function transfers the unlocked tokens to the caller's address.
     * Only tokens associated with the caller's lock IDs and whose unlock time has passed will be claimed.
     * Emits a `ClaimUnlockedTokens` event for each successfully claimed token.
     */

    function claimAllUnlockedTokens() public nonReentrant {
        address sender = _msgSender();
        uint256[] memory lockIds = userLockIds[sender];
        uint256 lockIdsLength = lockIds.length;

        for (uint256 i = 0; i < lockIdsLength; i++) {
            uint256 lockId = lockIds[i];
            LockedToken storage lock = lockedTokens[lockId];

            // if the lock is claimed, it cannot be claimed again
            if (!lock.claimed && block.timestamp >= lock.unlockTime) {
                lockOwner[lockId] = address(0);
                lock.claimed = true;
                lock.token.safeTransfer(sender, lock.amount);

                emit ClaimUnlockedTokens(sender, lockId);
            }
        }
    }

    /**
     * @dev Transfers the ownership of a lock to a new owner.
     * @param _lockId The ID of the lock to transfer ownership.
     * @param _newOwner The address of the new owner.
     * @notice This function can only be called by the current owner of the lock.
     * @notice The new owner cannot be the zero address.
     * @notice If the lock ID is invalid or the caller is not the current owner, the function will revert.
     * @notice The lock ownership is updated, and the lock is added to the new owner's list of locks.
     * @notice The lock is removed from the old owner's list of locks.
     * @notice Emits a TransferLockOwnership event with the lock ID, the current owner, and the new owner.
     */
    function transferLockOwnership(
        uint256 _lockId,
        address _newOwner
    ) public nonReentrant {
        if (_newOwner == address(0)) revert InvalidAddress(_newOwner);
        if (_newOwner == _msgSender()) revert InvalidAddress(_newOwner);
        address sender = _msgSender();

        if (_lockId >= lockedTokens.length) {
            revert InvalidLockId();
        }
        if (lockOwner[_lockId] != sender) {
            revert UnauthorizedLockId();
        }
        // if the lock is claimed, it cannot be transferred
        if (lockedTokens[_lockId].claimed) {
            revert AlreadyClaimed();
        }

        lockOwner[_lockId] = _newOwner; // Update lock owner
        userLockIds[_newOwner].push(_lockId); // Add lock to new owner
        // Remove lock from old owner
        uint256[] storage oldOwnerLockIds = userLockIds[sender];
        uint256 oldOwnerLockIdsLength = oldOwnerLockIds.length;
        for (uint256 i = 0; i < oldOwnerLockIdsLength; i++) {
            if (oldOwnerLockIds[i] == _lockId) {
                oldOwnerLockIds[i] = oldOwnerLockIds[oldOwnerLockIdsLength - 1];
                oldOwnerLockIds.pop();
                break;
            }
        }

        emit TransferLockOwnership(_lockId, sender, _newOwner);
    }

    /**
     * @dev Returns the lock IDs for a given user.
     * @param _user The address of the user.
     * @return _lockIDs An array of lock IDs.
     */
    function getUserLocks(
        address _user
    ) external view returns (uint256[] memory _lockIDs) {
        return userLockIds[_user];
    }

    /**
     * @dev Retrieves the details of a specific lock.
     * @param _lockId The ID of the lock to retrieve details for.
     * @return _lockDetails The details of the lock as a `LockedToken` struct.
     */
    function getLockDetails(
        uint256 _lockId
    ) external view returns (LockedToken memory _lockDetails) {
        return lockedTokens[_lockId];
    }

    /**
     * @dev Retrieves all lock details for a given user.
     * @param _user The address of the user.
     * @return _lockDetails An array of LockedToken structs representing the lock details.
     */
    function getAllLockDetailsForUser(
        address _user
    ) external view returns (LockedToken[] memory _lockDetails) {
        uint256[] memory lockIds = userLockIds[_user];
        uint256 lockIdsLength = lockIds.length; // Cached length for gas optimization
        LockedToken[] memory locks = new LockedToken[](lockIdsLength);

        for (uint256 i = 0; i < lockIdsLength; i++) {
            locks[i] = lockedTokens[lockIds[i]];
        }

        return locks;
    }

    /**
     * @dev Retrieves the lock details for a specific user and token.
     * @param _user The address of the user.
     * @param _token The address of the token.
     * @return _lockDetails An array of LockedToken structs representing the lock details.
     */
    function getLockDetailsByUserAndToken(
        address _user,
        IERC20 _token
    ) external view returns (LockedToken[] memory _lockDetails) {
        uint256[] memory lockIds = userLockIds[_user];
        uint256 relevantLocksCount = 0;
        uint256 lockIdsLength = lockIds.length;

        // First pass: Count relevant locks
        for (uint256 i = 0; i < lockIdsLength; i++) {
            if (lockedTokens[lockIds[i]].token == _token) {
                relevantLocksCount++;
            }
        }

        // Allocate array of the correct size
        LockedToken[] memory relevantLocks = new LockedToken[](
            relevantLocksCount
        );

        // Second pass: Populate the array
        uint256 counter = 0;
        for (uint256 i = 0; i < lockIdsLength; i++) {
            if (lockedTokens[lockIds[i]].token == _token) {
                relevantLocks[counter] = lockedTokens[lockIds[i]];
                counter++;
            }
        }

        return relevantLocks;
    }

    /**
     * @dev Retrieves the lock details for a specific token.
     * @param _token The ERC20 token for which to retrieve the lock details.
     * @return _lockDetails An array of LockedToken structs representing the lock details.
     */
    function getLockDetailsByToken(
        IERC20 _token
    ) external view returns (LockedToken[] memory _lockDetails) {
        uint256 lockCount = lockedTokens.length;
        uint256 relevantLocksCount = 0;

        // First pass: Count relevant locks
        for (uint256 i = 0; i < lockCount; i++) {
            if (lockedTokens[i].token == _token) {
                relevantLocksCount++;
            }
        }

        // Allocate array of the correct size
        LockedToken[] memory relevantLocks = new LockedToken[](
            relevantLocksCount
        );

        // Second pass: Populate the array
        uint256 counter = 0;
        for (uint256 i = 0; i < lockCount; i++) {
            if (lockedTokens[i].token == _token) {
                relevantLocks[counter] = lockedTokens[i];
                counter++;
            }
        }

        return relevantLocks;
    }

    /**
     * @dev Returns the number of locks for a given user.
     * @param _user The address of the user.
     * @return _count The number of locks.
     */
    function getUserLocksCount(
        address _user
    ) external view returns (uint256 _count) {
        return userLockIds[_user].length;
    }
}

// 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 v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 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 v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @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 v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../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 An operation with an ERC20 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.
     */
    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.
     */
    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.
     */
    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 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);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            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 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(token).code.length > 0;
    }
}

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

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

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

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) 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 FailedInnerCall();
        }
    }
}

// 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 v5.0.0) (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 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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 50
  },
  "evmVersion": "paris",
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_daysToLock","type":"uint256"}],"name":"lockTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"lockedTokens","outputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"},{"internalType":"uint256","name":"totalLockDuration","type":"uint256"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"lockId","type":"uint256"},{"internalType":"bool","name":"claimed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_lockId","type":"uint256"},{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferLockOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userLockIds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000078d4bc2aaac565e7b96ab6607563a1403e508b490000000000000000000000005568938bf4188bb868dbf31614091062c4a44b1e

-----Decoded View---------------
Arg [0] : _feeTo (address): 0x78D4BC2aaaC565E7b96aB6607563a1403e508B49
Arg [1] : _feeToSetter (address): 0x5568938Bf4188Bb868Dbf31614091062C4a44B1E

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000078d4bc2aaac565e7b96ab6607563a1403e508b49
Arg [1] : 0000000000000000000000005568938bf4188bb868dbf31614091062c4a44b1e