// SPDX-License-Identifier: UNLICENSED
pragma solidity =0.8.24;

import "@openzeppelin/contracts/access/Ownable2Step.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract SynthrStaking is Ownable2Step, Pausable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    /// @notice Address of reward token contract.
    IERC20 public immutable SYNTH;

    uint256 public constant ACC_REWARD_PRECISION = 1e18;

    /// @notice Info of each user.
    /// `amount` SYNTH token amount the user has provided.
    /// `rewardDebt` The amount of reward token entitled to the user.
    struct UserInfo {
        uint256 amount;
        uint256 lockType;
        uint256 unlockEnd;
        int256 rewardDebt;
    }

    struct LockInfo {
        bool exist;
        uint64 lastRewardBlock;
        uint256 maxPoolSize;
        uint256 penalty;
        uint256 coolDownPeriod;
        uint256 totalStaked;
        uint256 rewardPerBlock;
        uint256 accRewardPerShare;
        uint256 epoch;
    }

    bool public killed;
    bool public emergencyWithdrawAllowed;

    /// @notice Total lock amount of users
    uint256 public totalSupply;

    uint256 public penaltyAmount;

    /// @notice Info of each user that stakes SYNTH tokens.
    mapping(address => UserInfo) public userInfo;

    mapping(address => uint256) public coolDownPeriod;

    mapping(uint256 => LockInfo) public lockInfo;

    event Deposit(address indexed user, uint256 amount);
    event Withdraw(address indexed user, address indexed to, uint256 amount);
    event Claimed(address indexed user, address indexed to, uint256 pendingRewardAmount);
    event LogUpdatePool(uint64 lastRewardBlock, uint256 accRewardPerShare);
    event EpochUpdated(address indexed owner, uint256[] lockType, uint256[] rewardPerBlock);
    event EmergencyWithdraw(address indexed user, uint256 amount);
    event PoolAlived(address indexed owner, bool _alive);
    event KillPool(address indexed owner, bool _killed);
    event RecoveredToken(address indexed owner, address indexed token, uint256 amount);
    event WithdrawPenalty(address indexed owner, address indexed to, uint256 penaltyAmount);
    event ToggleEmergencyWithdraw(address indexed owner, bool emergencyWithdrawAllowed);

    constructor(
        address _admin,
        address _SYNTH,
        uint256[] memory _lockType,
        LockInfo[] memory _lockInfo
    ) Ownable(_admin) {
        require(_lockInfo.length == _lockType.length, "SynthrStaking: length not equal");
        require(_SYNTH != address(0), "SynthrStaking: Address Zero Found");
        SYNTH = IERC20(_SYNTH);

        for (uint256 i; i < _lockType.length; ++i) {
            lockInfo[_lockType[i]] = _lockInfo[i];
        }
    }

    modifier isAlive() {
        require(!killed, "SynthrStaking: pool is killed");
        _;
    }

    /// @dev return user reward debt
    /// @param _user address of user
    function userRewardsDebt(address _user) external view returns (int256) {
        return userInfo[_user].rewardDebt;
    }

    /// @notice View function to see pending reward of user in pool at current block.
    /// @param _user Address of user.
    /// @return pending_ reward for a given user.
    function pendingReward(address _user) external view returns (uint256 pending_) {
        pending_ = _pendingRewardAmount(_user, block.number);
    }

    /// @notice View function to see pending reward of user at future block.
    /// @param _user Address of user.
    /// @return pending_ reward for a given user.
    function pendingRewardAtBlock(
        address _user,
        uint256 _blockNumber
    ) external view returns (uint256 pending_) {
        pending_ = _pendingRewardAmount(_user, _blockNumber);
    }

    /**
     * @dev pause pool to restrict pool functionality, can only be called by admin
     */
    function pausePool() external onlyOwner {
        _pause();
    }

    /**
     * @dev unpause pool, can only be called by admin
     */
    function unpausePool() external onlyOwner {
        _unpause();
    }

    /**
     * @dev kill pool to restrict pool functionality, can only be called by admin
     */
    function killPool() external onlyOwner {
        killed = true;
        emit KillPool(msg.sender, true);
    }

    /**
     * @dev revive pool, can only be called by admin
     */
    function revivePool() external onlyOwner {
        killed = false;
        emit PoolAlived(msg.sender, false);
    }

    function setLockInfo(
        uint256 _lockType,
        uint256 _maxPoolSize,
        uint256 _penalty,
        uint256 _coolDownPeriod
    ) external onlyOwner {
        require(_penalty <= 100, "SynthrStaking: Penalty percentage greater than 100");
        LockInfo memory _lockInfo = lockInfo[_lockType];
        _lockInfo.coolDownPeriod = _coolDownPeriod;
        _lockInfo.maxPoolSize = _maxPoolSize;
        _lockInfo.penalty = _penalty;
        _lockInfo.exist = true;

        lockInfo[_lockType] = _lockInfo;
    }

    function toggleEmergencyWithdraw() external onlyOwner {
        emergencyWithdrawAllowed = !emergencyWithdrawAllowed;

        emit ToggleEmergencyWithdraw(msg.sender, emergencyWithdrawAllowed);
    }

    /// @notice update epoch of pool
    function updateEpoch(
        uint256 _rewardAmount,
        uint256[] memory _rewardPerBlock,
        uint256[] memory _lockType
    ) external whenNotPaused isAlive onlyOwner {
        require(_rewardPerBlock.length == _lockType.length, "SynthrStaking: length not equal");

        for (uint256 i; i < _rewardPerBlock.length; ++i) {
            LockInfo memory _lockInfo = lockInfo[_lockType[i]];
            _lockInfo.rewardPerBlock = _rewardPerBlock[i];
            ++_lockInfo.epoch;

            lockInfo[_lockType[i]] = _lockInfo;
        }

        SYNTH.safeTransferFrom(msg.sender, address(this), _rewardAmount);
        emit EpochUpdated(msg.sender, _lockType, _rewardPerBlock);
    }

    /// @notice Deposit token.
    function deposit(uint256 _amount, uint256 _lockType) external whenNotPaused isAlive {
        LockInfo memory _lockInfo = _updatePool(_lockType);

        require(
            _lockInfo.totalStaked + _amount <= _lockInfo.maxPoolSize,
            "SynthrStaking: max amount limit exceed"
        );

        UserInfo memory _user = userInfo[msg.sender];
        require(
            _user.unlockEnd == 0 || _user.unlockEnd > block.timestamp,
            "SynthrStaking: withdraw locked token"
        );

        require(
            _user.lockType == 0 || _user.lockType == _lockType,
            "SynthrStaking: lock type differ"
        );

        // Effects
        int256 _calRewardDebt = _calAccRewardPerShare(_lockInfo.accRewardPerShare, _amount);

        if (_user.amount == 0) {
            _user.unlockEnd = block.timestamp + _lockType;
            _user.lockType = _lockType;
        }
        _user.amount += _amount;
        _user.rewardDebt += _calRewardDebt;

        userInfo[msg.sender] = _user;

        totalSupply += _amount;
        _lockInfo.totalStaked += _amount;
        lockInfo[_lockType] = _lockInfo;

        SYNTH.safeTransferFrom(msg.sender, address(this), _amount);

        emit Deposit(msg.sender, _amount);
    }

    /// @notice Claim proceeds for transaction sender to `to`.
    /// @param _to Receiver receives SYNTH token as reward.
    function claim(address _to) external nonReentrant whenNotPaused {
        UserInfo memory _user = userInfo[msg.sender];
        require(_user.unlockEnd < block.timestamp, "SynthrStaking: claim after lock end");
        LockInfo memory _lockInfo = _updatePool(_user.lockType);

        (int256 accumulatedReward, uint256 _pendingReward) = _calAccumulatedAndPendingReward(
            _lockInfo.accRewardPerShare,
            _user.amount,
            _user.rewardDebt
        );

        // Effects
        lockInfo[_user.lockType] = _lockInfo;
        _user.rewardDebt = accumulatedReward;
        userInfo[msg.sender] = _user;

        // Interactions
        if (_pendingReward != 0) {
            SYNTH.safeTransfer(_to, _pendingReward);
        }

        emit Claimed(msg.sender, _to, _pendingReward);
    }

    function withdrawRequest() external whenNotPaused {
        uint256 _lockType = userInfo[msg.sender].lockType;
        coolDownPeriod[msg.sender] = block.timestamp + lockInfo[_lockType].coolDownPeriod;
    }

    /// @notice Withdraw  token from pool and claim proceeds for transaction sender to `to`.
    /// @param _to Receiver of the SYNTH tokens with their pending reward(in SYNTHs).
    function withdraw(address _to) external nonReentrant whenNotPaused {
        uint256 _coolDownPeriod = coolDownPeriod[msg.sender];
        require(_coolDownPeriod != 0, "SynthrStaking: request for withdraw");
        require(_coolDownPeriod < block.timestamp, "SynthrStaking: lock time not end");
        UserInfo memory _user = userInfo[msg.sender];
        LockInfo memory _lockInfo = _updatePool(_user.lockType);

        (, uint256 _pendingReward) = _calAccumulatedAndPendingReward(
            _lockInfo.accRewardPerShare,
            _user.amount,
            _user.rewardDebt
        );

        uint256 _amount = _user.amount;
        totalSupply -= _amount;
        _lockInfo.totalStaked -= _amount;
        if (_user.unlockEnd > block.timestamp) {
            uint256 _lockType = _user.lockType;
            _amount = (_amount * (100 - lockInfo[_lockType].penalty)) / 100;
            penaltyAmount += _user.amount - _amount;
        }

        lockInfo[_user.lockType] = _lockInfo;
        delete userInfo[msg.sender];
        coolDownPeriod[msg.sender] = 0;

        // Interactions
        SYNTH.safeTransfer(_to, _pendingReward + _amount);

        emit Withdraw(msg.sender, _to, _pendingReward + _amount);
    }

    function emergencyWithdraw() public nonReentrant whenNotPaused {
        require(emergencyWithdrawAllowed, "SynthrStaking: emergency withdraw not allowed");
        UserInfo memory _user = userInfo[msg.sender];
        uint256 _amount = _user.amount;
        require(_amount > 0, "SynthrStaking: Amount should be non zero");

        LockInfo memory _lockInfo = lockInfo[_user.lockType];
        _lockInfo.totalStaked -= _amount;
        lockInfo[_user.lockType] = _lockInfo;
        delete userInfo[msg.sender];

        totalSupply -= _amount;

        // Interactions
        SYNTH.safeTransfer(msg.sender, _amount);

        emit EmergencyWithdraw(msg.sender, _amount);
    }

    function recoverToken(
        address _token,
        address _to,
        uint256 _amount
    ) external onlyOwner nonReentrant whenNotPaused {
        if (_token == address(SYNTH)) {
            require(
                IERC20(_token).balanceOf(address(this)) - _amount >= totalSupply,
                "SynthrStaking: can not withdraw user token"
            );
        }
        IERC20(_token).safeTransfer(_to, _amount);

        emit RecoveredToken(msg.sender, _token, _amount);
    }

    function withdrawPenalty(address _to) external onlyOwner nonReentrant whenNotPaused {
        uint256 oldPenaltyAmount = penaltyAmount;
        penaltyAmount = 0;
        emit WithdrawPenalty(msg.sender, _to, oldPenaltyAmount);
        SYNTH.safeTransfer(_to, oldPenaltyAmount);
    }

    /// @notice Update reward variables of the pool.
    function _updatePool(uint256 _lockType) internal returns (LockInfo memory _lockInfo) {
        _lockInfo = lockInfo[_lockType];
        require(_lockInfo.exist, "SynthrStaking: lock type not exist");
        uint256 _lpSupply = totalSupply;
        if (block.number > _lockInfo.lastRewardBlock) {
            if (_lpSupply > 0) {
                uint256 _blocks = block.number - _lockInfo.lastRewardBlock;
                uint256 _rewardAmount = (_blocks * _lockInfo.rewardPerBlock);
                _lockInfo.accRewardPerShare += _calAccPerShare(_rewardAmount, _lpSupply);
            }
            _lockInfo.lastRewardBlock = uint64(block.number);

            emit LogUpdatePool(_lockInfo.lastRewardBlock, _lockInfo.accRewardPerShare);
        }
    }

    function _pendingRewardAmount(
        address _user,
        uint256 _blockNumber
    ) internal view returns (uint256 _pending) {
        uint256 _lpSupply = totalSupply;
        UserInfo memory _userInfo = userInfo[_user];
        LockInfo memory _lockInfo = lockInfo[_userInfo.lockType];
        uint256 _accRewardPerShare = _lockInfo.accRewardPerShare;
        if (_blockNumber > _lockInfo.lastRewardBlock && _lpSupply != 0) {
            uint256 _blocks = _blockNumber - (_lockInfo.lastRewardBlock);
            uint256 _rewardAmount = (_blocks * _lockInfo.rewardPerBlock);
            _accRewardPerShare += (_calAccPerShare(_rewardAmount, _lpSupply));
        }
        _pending = uint256(
            _calAccRewardPerShare(_accRewardPerShare, _userInfo.amount) - _userInfo.rewardDebt
        );
    }

    function _calAccPerShare(
        uint256 _rewardAmount,
        uint256 _lpSupply
    ) internal pure returns (uint256) {
        return (_rewardAmount * ACC_REWARD_PRECISION) / _lpSupply;
    }

    function _calAccRewardPerShare(
        uint256 _accRewardPerShare,
        uint256 _amount
    ) internal pure returns (int256) {
        return int256((_amount * _accRewardPerShare) / ACC_REWARD_PRECISION);
    }

    function _calAccumulatedAndPendingReward(
        uint256 _accRewardPerShare,
        uint256 _amount,
        int256 _rewardDebt
    ) internal pure returns (int256 _accumulatedReward, uint256 _pendingReward) {
        _accumulatedReward = _calAccRewardPerShare(_accRewardPerShare, _amount);
        _pendingReward = uint256(_accumulatedReward - (_rewardDebt));
    }
}

// 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) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "./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.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. 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 {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

// 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/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/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/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 v5.0.0) (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": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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