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

import "./interfaces/IMinter.sol";
import "./interfaces/IVoter.sol";
import "./interfaces/IVotingEscrow.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract Bribe is ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint256 public constant WEEK = 7 days; // rewards are released over 7 days
    uint256 public firstBribeTimestamp;

    /* ========== STATE VARIABLES ========== */

    struct Reward {
        uint256 periodFinish;
        uint256 rewardsPerEpoch;
        uint256 lastUpdateTime; 
    }

    mapping(address => mapping(uint256 => Reward)) public rewardData;  // token -> startTimestamp -> Reward
    mapping(address => bool) public isRewardToken;
    address[] public rewardTokens;
    address public voter;
    address public immutable bribeFactory;
    address public minter;
    address public immutable ve;
    address public owner;

    string public TYPE;

    // owner -> reward token -> lastTime
    mapping(address => mapping(address => uint256)) public userRewardPerTokenPaid;
    mapping(address => mapping(address => uint256)) public userTimestamp;
    mapping(uint256 => uint256) public safetyMargin; // transition to n+1. this mapping is for unexpected consequences regarding removal of "+ WEEK" in multiple functions

    //uint256 private _totalSupply;
    mapping(uint256 => uint256) private _totalSupply;
    mapping(address => mapping(uint256 => uint256)) private _balances; //owner -> timestamp -> amount


    /* ========== CONSTRUCTOR ========== */

    constructor(address _owner,address _voter,address _bribeFactory, string memory _type)  {
        require(_bribeFactory != address(0) && _voter != address(0) && _owner != address(0));
        voter = _voter;
        bribeFactory = _bribeFactory;
        firstBribeTimestamp = 0;
        ve = IVoter(_voter)._ve();
        minter = IVoter(_voter).minter();
        require(minter != address(0));
        owner = _owner;
        TYPE = _type;
    }

    /// @notice get the current epoch 
    function getEpochStart() public view returns(uint256){
        return IMinter(minter).active_period();
    }

    /// @notice get next epoch (where bribes are saved)
    function getNextEpochStart() public view returns(uint256){
        return getEpochStart() + WEEK;
    }


    /* ========== VIEWS ========== */

    /// @notice get the length of the reward tokens
    function rewardsListLength() external view returns(uint256) {
        return rewardTokens.length;
    }

    /// @notice get the last totalSupply (total votes for a pool)
    function totalSupply() external view returns (uint256) {
        uint256 _currentEpochStart = IMinter(minter).active_period() + safetyMargin[0]; // claim until current epoch + safetyMargin
        return _totalSupply[_currentEpochStart];
    }

    /// @notice get a totalSupply given a timestamp
    function totalSupplyAt(uint256 _timestamp) external view returns (uint256) {
        return _totalSupply[_timestamp];
    }

    /// @notice read the balanceOf the tokenId at a given timestamp
    function balanceOfAt(uint256 tokenId, uint256 _timestamp) public view returns (uint256) {
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        return _balances[_owner][_timestamp];
    }


    /// @notice get last deposit available given a tokenID
    function balanceOf(uint256 tokenId) public view returns (uint256) {
        uint256 _timestamp = getNextEpochStart();
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        return _balances[_owner][_timestamp];
    }

    /// @notice get the balance of an owner in the current epoch
    function balanceOfOwner(address _owner) public view returns (uint256) {
        uint256 _timestamp = getNextEpochStart();
        return _balances[_owner][_timestamp];
    }

    /// @notice get the balance of an owner given a timestamp
    function balanceOfOwnerAt(address _owner, uint256 _timestamp) public view returns (uint256) {
        return _balances[_owner][_timestamp];
    }


    /// @notice Read earned amount given a tokenID and _rewardToken
    function earned(uint256 tokenId, address _rewardToken) public view returns(uint256){
        uint256 k = 0;
        uint256 reward = 0;
        uint256 _endTimestamp = IMinter(minter).active_period() + safetyMargin[1]; // claim until current epoch + safetyMargin
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        uint256 _userLastTime = userTimestamp[_owner][_rewardToken];
        
        if(_endTimestamp == _userLastTime){
            return 0;
        }

        // if user first time then set it to first bribe - week to avoid any timestamp problem
        if(_userLastTime < firstBribeTimestamp){
            _userLastTime = firstBribeTimestamp - WEEK;
        }

        for(k; k < 50; k++){
            if(_userLastTime == _endTimestamp){
                // if we reach the current epoch, exit
                break;
            }
            reward += _earned(_owner, _rewardToken, _userLastTime);
            _userLastTime += WEEK;   
                     
        }  
        return reward;  
    }

    /// @notice read earned amounts given an address and the reward token
    function earned(address _owner, address _rewardToken) public view returns(uint256){
        uint256 k = 0;
        uint256 reward = 0;
        uint256 _endTimestamp = IMinter(minter).active_period() + safetyMargin[2]; // claim until current epoch + safetyMargin
        uint256 _userLastTime = userTimestamp[_owner][_rewardToken];
        
        if(_endTimestamp == _userLastTime){
            return 0;
        }

        // if user first time then set it to first bribe - week to avoid any timestamp problem
        if(_userLastTime < firstBribeTimestamp){
            _userLastTime = firstBribeTimestamp - WEEK;
        }

        for(k; k < 50; k++){
            if(_userLastTime == _endTimestamp){
                // if we reach the current epoch, exit
                break;
            }
            reward += _earned(_owner, _rewardToken, _userLastTime);
            _userLastTime += WEEK;   
                     
        }  
        return reward;  
    }

    /// @notice Read earned amount given address and reward token, returns the rewards and the last user timestamp (used in case user do not claim since 50+epochs)
    function earnedWithTimestamp(address _owner, address _rewardToken) private view returns(uint256,uint256){
        uint256 k = 0;
        uint256 reward = 0;
        uint256 _endTimestamp = IMinter(minter).active_period() + safetyMargin[3]; // claim until current epoch + safetyMargin
        uint256 _userLastTime = userTimestamp[_owner][_rewardToken];
        
        
        // if user first time then set it to first bribe - week to avoid any timestamp problem
        if(_userLastTime < firstBribeTimestamp){
            _userLastTime = firstBribeTimestamp - WEEK;
        }

        for(k; k < 50; k++){
            if(_userLastTime == _endTimestamp){
                // if we reach the current epoch, exit
                break;
            }
            reward += _earned(_owner, _rewardToken, _userLastTime);
            _userLastTime += WEEK;   
                     
        }  
        return (reward, _userLastTime);  
    }

    /// @notice get the earned rewards
    function _earned(address _owner, address _rewardToken, uint256 _timestamp) internal view returns (uint256) {
        uint256 _balance = balanceOfOwnerAt(_owner, _timestamp);
        if(_balance == 0){
            return 0;
        } else {
            uint256 _rewardPerToken = rewardPerToken(_rewardToken, _timestamp);
            uint256 _rewards = _rewardPerToken * _balance / 1e36;
            return _rewards;
        }
    }

    /// @notice get the rewards for token
    function rewardPerToken(address _rewardsToken, uint256 _timestamp) public view returns (uint256) {
        if (_totalSupply[_timestamp] == 0) {
            return rewardData[_rewardsToken][_timestamp].rewardsPerEpoch;
        }
        return rewardData[_rewardsToken][_timestamp].rewardsPerEpoch * 1e36 / _totalSupply[_timestamp];
    }

 
    /* ========== MUTATIVE FUNCTIONS ========== */

    /// @notice User votes deposit
    /// @dev    called on voter.vote() or voter.poke()
    ///         we save into owner "address" and not "tokenID". 
    ///         Owner must reset before transferring token
    function deposit(uint256 amount, uint256 tokenId) external nonReentrant {
        require(amount > 0, "Cannot stake 0");
        require(msg.sender == voter);
        uint256 _startTimestamp = IMinter(minter).active_period() + safetyMargin[4];
        uint256 _oldSupply = _totalSupply[_startTimestamp]; 
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        uint256 _lastBalance = _balances[_owner][_startTimestamp]; 

        _totalSupply[_startTimestamp] =  _oldSupply + amount;
        _balances[_owner][_startTimestamp] = _lastBalance + amount;

        emit Staked(tokenId, amount);
    }

    /// @notice User votes withdrawal 
    /// @dev    called on voter.reset()
    function withdraw(uint256 amount, uint256 tokenId) external nonReentrant {
        require(amount > 0, "Cannot withdraw 0");
        require(msg.sender == voter);
        uint256 _startTimestamp = IMinter(minter).active_period() + safetyMargin[5]; 
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);

        // incase of bribe contract reset in gauge proxy
        if (amount <= _balances[_owner][_startTimestamp]) {
            uint256 _oldSupply = _totalSupply[_startTimestamp]; 
            uint256 _oldBalance = _balances[_owner][_startTimestamp];
            _totalSupply[_startTimestamp] =  _oldSupply - amount;
            _balances[_owner][_startTimestamp] =  _oldBalance - amount;
            emit Withdrawn(tokenId, amount);
        }

    }

    /// @notice Claim the TOKENID rewards
    function getReward(uint256 tokenId, address[] memory tokens) external nonReentrant  {
        require(IVotingEscrow(ve).isApprovedOrOwner(msg.sender, tokenId));
        uint256 _userLastTime;
        uint256 reward = 0;
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        
        for (uint256 i = 0; i < tokens.length; i++) {
            address _rewardToken = tokens[i];
            (reward, _userLastTime) = earnedWithTimestamp(_owner, _rewardToken);          
            if (reward > 0) {
                IERC20(_rewardToken).safeTransfer(_owner, reward);
                emit RewardPaid(_owner, _rewardToken, reward);
            }
            userTimestamp[_owner][_rewardToken] = _userLastTime;
        }
    }

    /// @notice Claim the rewards given msg.sender
    function getReward(address[] memory tokens) external nonReentrant  {
        uint256 _userLastTime;
        uint256 reward = 0;
        address _owner = msg.sender;
        
        for (uint256 i = 0; i < tokens.length; i++) {
            address _rewardToken = tokens[i];
            (reward, _userLastTime) = earnedWithTimestamp(_owner, _rewardToken);          
            if (reward > 0) {
                IERC20(_rewardToken).safeTransfer(_owner, reward);
                emit RewardPaid(_owner, _rewardToken, reward);
            }
            userTimestamp[_owner][_rewardToken] = _userLastTime;
        }
    }

    /// @notice Claim rewards from voter
    function getRewardForOwner(uint256 tokenId, address[] memory tokens) public nonReentrant  {
        require(msg.sender == voter);
        uint256 _userLastTime;
        uint256 reward = 0;
        address _owner = IVotingEscrow(ve).ownerOf(tokenId);

        for (uint256 i = 0; i < tokens.length; i++) {
            address _rewardToken = tokens[i];
            (reward, _userLastTime) = earnedWithTimestamp(_owner, _rewardToken);    
            if (reward > 0) {
                IERC20(_rewardToken).safeTransfer(_owner, reward);
                emit RewardPaid(_owner, _rewardToken, reward);
            }
            userTimestamp[_owner][_rewardToken] = _userLastTime;
        }
    }

    /// @notice Claim rewards from voter
    function getRewardForAddress(address _owner, address[] memory tokens) public nonReentrant  {
        require(msg.sender == voter);
        uint256 _userLastTime;
        uint256 reward = 0;

        for (uint256 i = 0; i < tokens.length; i++) {
            address _rewardToken = tokens[i];
            (reward, _userLastTime) = earnedWithTimestamp(_owner, _rewardToken);    
            if (reward > 0) {
                IERC20(_rewardToken).safeTransfer(_owner, reward);
                emit RewardPaid(_owner, _rewardToken, reward);
            }
            userTimestamp[_owner][_rewardToken] = _userLastTime;
        }
    }

    /// @notice Notify a bribe amount
    function notifyRewardAmount(address _rewardsToken, uint256 reward) external nonReentrant {
        require(isRewardToken[_rewardsToken], "reward token not verified");
        IERC20(_rewardsToken).safeTransferFrom(msg.sender,address(this),reward);

        uint256 _startTimestamp = IMinter(minter).active_period() + safetyMargin[6]; //period points to the current thursday. Bribes are distributed from next epoch (thursday) + safetyMargin
        if(firstBribeTimestamp == 0){
            firstBribeTimestamp = _startTimestamp;
        }

        uint256 _lastReward = rewardData[_rewardsToken][_startTimestamp].rewardsPerEpoch;
        
        rewardData[_rewardsToken][_startTimestamp].rewardsPerEpoch = _lastReward + reward;
        rewardData[_rewardsToken][_startTimestamp].lastUpdateTime = block.timestamp;
        rewardData[_rewardsToken][_startTimestamp].periodFinish = _startTimestamp + WEEK;

        emit RewardAdded(_rewardsToken, reward, _startTimestamp);
    }



    /* ========== RESTRICTED FUNCTIONS ========== */

    /// @notice add rewards tokens
    function addRewardTokens(address[] memory _rewardsToken) public onlyAllowed {
        uint256 i = 0;
        for(i; i < _rewardsToken.length; i++){
           _addRewardToken(_rewardsToken[i]);
        }
    }

    /// @notice add a single reward token
    function addRewardToken(address _rewardsToken) public onlyAllowed {
        _addRewardToken(_rewardsToken);
    }
    function _addRewardToken(address _rewardsToken) internal {
        if(!isRewardToken[_rewardsToken]){
            isRewardToken[_rewardsToken] = true;
            rewardTokens.push(_rewardsToken);
        }
    }

    /// @notice Recover some ERC20 from the contract and updated given bribe
    function recoverERC20AndUpdateData(address tokenAddress, uint256 tokenAmount) external onlyAllowed {
        require(tokenAmount <= IERC20(tokenAddress).balanceOf(address(this)));
        
        uint256 _startTimestamp = IMinter(minter).active_period() + safetyMargin[7];
        uint256 _lastReward = rewardData[tokenAddress][_startTimestamp].rewardsPerEpoch;
        rewardData[tokenAddress][_startTimestamp].rewardsPerEpoch = _lastReward - tokenAmount;
        rewardData[tokenAddress][_startTimestamp].lastUpdateTime = block.timestamp;


        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    /// @notice Recover some ERC20 from the contract.
    /// @dev    Be careful --> if called then getReward() at last epoch will fail because some reward are missing! 
    ///         Think about calling recoverERC20AndUpdateData()
    function emergencyRecoverERC20(address tokenAddress, uint256 tokenAmount) external onlyAllowed {
        require(tokenAmount <= IERC20(tokenAddress).balanceOf(address(this)));
        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    /// @notice Set a new voter
    function setVoter(address _Voter) external onlyAllowed {
        require(_Voter != address(0));
        voter = _Voter;
    }

    /// @notice Set a new minter
    function setMinter(address _minter) external onlyAllowed {
        require(_minter != address(0));
        minter = _minter;
    }

    /// @notice Set a new Owner
    event SetOwner(address indexed _owner);
    function setOwner(address _owner) external onlyAllowed {
        require(_owner != address(0));
        owner = _owner;
        emit SetOwner(_owner);
    }

    /// @notice Set safety margin for future flexibility & fix in case of any errors
    function setSafetyMargin(uint256 index, uint256 amount) external onlyAllowed {
        safetyMargin[index] = amount;
    }

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

    modifier onlyAllowed() {
        require( (msg.sender == owner || msg.sender == bribeFactory), "permission is denied!" );
        _;
    }


    /* ========== EVENTS ========== */

    event RewardAdded(address indexed rewardToken, uint256 reward, uint256 startTimestamp);
    event Staked(uint256 indexed tokenId, uint256 amount);
    event Withdrawn(uint256 indexed tokenId, uint256 amount);
    event RewardPaid(address indexed user,address indexed rewardsToken,uint256 reward);
    event Recovered(address indexed token, uint256 amount);
}

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

pragma solidity ^0.8.0;

/**
 * @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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
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].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

interface IVoter {
    function claimBribes(address[] memory _bribes, address[][] memory _tokens, uint256 _tokenId) external;
    function claimFees(address[] memory _fees, address[][] memory _tokens, uint256 _tokenId) external;
    function reset(uint256 _tokenId) external;
    function vote(uint256 _tokenId, address[] calldata _poolVote, uint256[] calldata _weights) external;
    function poke(uint256 _tokenId) external;
    function _epochTimestamp() external view returns(uint256);

    function _ve() external view returns (address);
    function gauges(address _pair) external view returns (address);
    function isGauge(address _gauge) external view returns (bool);
    function poolForGauge(address _gauge) external view returns (address);
    function factory() external view returns (address);
    function minter() external view returns(address);
    function isWhitelisted(address token) external view returns (bool);
    function notifyRewardAmount(uint amount) external;
    function distributeAll() external;
    function distributeFees(address[] memory _gauges) external;

    function internal_bribes(address _gauge) external view returns (address);
    function external_bribes(address _gauge) external view returns (address);

    function usedWeights(uint id) external view returns(uint);
    function lastVoted(uint id) external view returns(uint);
    function poolVote(uint id, uint _index) external view returns(address _pair);
    function votes(uint id, address _pool) external view returns(uint votes);
    function poolVoteLength(uint tokenId) external view returns(uint);
    
}

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

interface IVotingEscrow {

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    struct LockedBalance {
        int128 amount;
        uint end;
    }

    function create_lock(uint _value, uint _lock_duration) external returns (uint);
    function create_lock_for(uint _value, uint _lock_duration, address _to) external returns (uint);
    function merge(uint _from, uint _to) external;
    function increase_amount(uint _tokenId, uint _value) external;
    function increase_unlock_time(uint _tokenId, uint _lock_duration) external;
    function split(uint[] memory amounts, uint _tokenId) external;
    function withdraw(uint _tokenId) external;
    function setApprovalForAll(address _operator, bool _approved) external;

    function locked(uint id) external view returns(LockedBalance memory);
    function tokenOfOwnerByIndex(address _owner, uint _tokenIndex) external view returns (uint);

    function token() external view returns (address);
    function team() external returns (address);
    function epoch() external view returns (uint);
    function point_history(uint loc) external view returns (Point memory);
    function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
    function user_point_epoch(uint tokenId) external view returns (uint);
    function optionToken() external view returns (address);
    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;
    function safeTransferFrom(
        address _from,
        address _to,
        uint _tokenId
    ) external;

    function voted(uint) external view returns (bool);
    function attachments(uint) external view returns (uint);
    function voting(uint tokenId) external;
    function abstain(uint tokenId) external;
    function attach(uint tokenId) external;
    function detach(uint tokenId) external;

    function checkpoint() external;
    function deposit_for(uint tokenId, uint value) external;

    function balanceOfNFT(uint _id) external view returns (uint);
    function balanceOf(address _owner) external view returns (uint);
    function totalSupply() external view returns (uint);
    function supply() external view returns (uint);
    function balanceOfNFTAt(uint _tokenId, uint _t) external view returns (uint);
    function balanceOfAtNFT(uint _tokenId, uint _t) external view returns (uint);



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

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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