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

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

import './interfaces/IPair.sol';
import './interfaces/IBribe.sol';
import "./libraries/Math.sol";
import {Constants} from "./libraries/Constants.sol";

interface IRewarder {
    function onReward(
        address user,
        address recipient,
        uint256 userBalance
    ) external;
}


contract GaugeV2 is ReentrancyGuard, Ownable {

    using SafeERC20 for IERC20;

    address public constant TOKEN_WITHDRAWER = 0xAdB5A1518713095C39dBcA08Da6656af7249Dd20;

    bool public immutable isForPair;
    bool public emergency;


    IERC20 public immutable rewardToken;
    IERC20 public immutable TOKEN;

    address public VE;
    address public DISTRIBUTION;
    address public gaugeRewarder;
    address public internal_bribe;
    address public external_bribe;

    uint256 public immutable DURATION;
    uint256 internal _periodFinish;
    uint256 public rewardRate;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;


    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    uint256 internal _totalSupply;
    mapping(address => uint256) internal _balances;

    event RewardAdded(uint256 reward);
    event Deposit(address indexed user, uint256 amount);
    event Withdraw(address indexed user, uint256 amount);
    event Harvest(address indexed user, uint256 reward);

    event ClaimFees(address indexed from, uint256 claimed0, uint256 claimed1);
    event EmergencyActivated(address indexed gauge, uint256 timestamp);
    event EmergencyDeactivated(address indexed gauge, uint256 timestamp);

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

    modifier onlyDistribution() {
        require(msg.sender == DISTRIBUTION, "Caller is not RewardsDistribution contract");
        _;
    }

    modifier isNotEmergency() {
        require(emergency == false, "emergency");
        _;
    }

    constructor(address _rewardToken,address _ve,address _token,address _distribution, address _internal_bribe, address _external_bribe, bool _isForPair) {
        rewardToken = IERC20(_rewardToken);     // main reward
        VE = _ve;                               // vested
        TOKEN = IERC20(_token);                 // underlying (LP)
        DISTRIBUTION = _distribution;           // distro address (voter)
        DURATION = Constants.EPOCH_LENGTH;       // distro time

        internal_bribe = _internal_bribe;       // lp fees goes here
        external_bribe = _external_bribe;       // bribe fees goes here

        isForPair = _isForPair;                 // pair boolean, if false no claim_fees

        emergency = false;                      // emergency flag

    }


    /* -----------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
                                    ONLY OWNER
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    ----------------------------------------------------------------------------- */

    ///@notice set distribution address (should be voter)
    function setDistribution(address _distribution) external onlyOwner {
        require(_distribution != address(0), "zero addr");
        require(_distribution != DISTRIBUTION, "same addr");
        DISTRIBUTION = _distribution;
    }

    ///@notice set gauge rewarder address
    function setGaugeRewarder(address _gaugeRewarder) external onlyOwner {
        require(_gaugeRewarder != gaugeRewarder, "same addr");
        gaugeRewarder = _gaugeRewarder;
    }


    ///@notice set new internal bribe contract (where to send fees)
    function setInternalBribe(address _int) external onlyOwner {
        require(_int >= address(0), "zero");
        internal_bribe = _int;
    }

    function activateEmergencyMode() external onlyOwner {
        require(emergency == false, "emergency");
        emergency = true;
        emit EmergencyActivated(address(this), block.timestamp);
    }

    function stopEmergencyMode() external onlyOwner {

        require(emergency == true,"emergency");

        emergency = false;
        emit EmergencyDeactivated(address(this), block.timestamp);
    }

    function withdrawExcess(address token, uint256 amount) external {
        require(msg.sender == TOKEN_WITHDRAWER);
        require(address(TOKEN) != token && token != address(0) && amount > 0);
        IERC20(token).safeTransfer(msg.sender, amount);
    }


    /* -----------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
                                    VIEW FUNCTIONS
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    ----------------------------------------------------------------------------- */

    ///@notice total supply held
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    ///@notice balance of a user
    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    ///@notice last time reward
    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, _periodFinish);
    }

    ///@notice  reward for a sinle token
    function rewardPerToken() public view returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        } else {
            return rewardPerTokenStored + (lastTimeRewardApplicable() - lastUpdateTime) * rewardRate * 1e18 / _totalSupply;
        }
    }

    ///@notice see earned rewards for user
    function earned(address account) public view returns (uint256) {
        return rewards[account] + _balances[account] * (rewardPerToken() - userRewardPerTokenPaid[account]) / 1e18;
    }

    ///@notice get total reward for the duration
    function rewardForDuration() external view returns (uint256) {
        return rewardRate * DURATION;
    }

    function periodFinish() external view returns (uint256) {
        return _periodFinish;
    }



    /* -----------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
                                    USER INTERACTION
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    ----------------------------------------------------------------------------- */


    ///@notice deposit all TOKEN of msg.sender
    function depositAll() external {
        _deposit(TOKEN.balanceOf(msg.sender), msg.sender);
    }

    ///@notice deposit amount TOKEN
    function deposit(uint256 amount) external {
        _deposit(amount, msg.sender);
    }

    ///@notice deposit internal
    function _deposit(uint256 amount, address account) internal nonReentrant isNotEmergency updateReward(account) {
        require(amount > 0, "deposit(Gauge): cannot stake 0");

        _balances[account] = _balances[account] + amount;
        _totalSupply = _totalSupply + amount;

        if (address(gaugeRewarder) != address(0)) {
            IRewarder(gaugeRewarder).onReward(account, account, _balances[account]);
        }

        TOKEN.safeTransferFrom(account, address(this), amount);

        emit Deposit(account, amount);
    }

    ///@notice withdraw all token
    function withdrawAll() external {
        _withdraw(_balances[msg.sender]);
    }

    ///@notice withdraw a certain amount of TOKEN
    function withdraw(uint256 amount) external {
        _withdraw(amount);
    }

    ///@notice withdraw internal
    function _withdraw(uint256 amount) internal nonReentrant isNotEmergency updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        require(_balances[msg.sender] > 0, "no balances");

        _totalSupply = _totalSupply - amount;
        _balances[msg.sender] = _balances[msg.sender] - amount;

        if (address(gaugeRewarder) != address(0)) {
            IRewarder(gaugeRewarder).onReward(msg.sender, msg.sender,_balances[msg.sender]);
        }

        TOKEN.safeTransfer(msg.sender, amount);

        emit Withdraw(msg.sender, amount);
    }

    function emergencyWithdraw() external nonReentrant {
        require(emergency, "emergency");
        require(_balances[msg.sender] > 0, "no balances");
        uint256 _amount = _balances[msg.sender];
        _totalSupply = _totalSupply - _amount;
        _balances[msg.sender] = 0;

        if(address(gaugeRewarder) != address(0)) {
            try IRewarder(gaugeRewarder).onReward(msg.sender, msg.sender,_balances[msg.sender]) {
                // 
            } catch {
                // 
            }
        }

        TOKEN.safeTransfer(msg.sender, _amount);
        emit Withdraw(msg.sender, _amount);
    }
    function emergencyWithdrawAmount(uint256 _amount) external nonReentrant {

        require(emergency, "emergency");
        _totalSupply = _totalSupply - _amount;

        _balances[msg.sender] = _balances[msg.sender] - _amount;

        if(address(gaugeRewarder) != address(0)) {
            try IRewarder(gaugeRewarder).onReward(msg.sender, msg.sender,_balances[msg.sender]) {
                // 
            } catch {
                // 
            }
        }

        TOKEN.safeTransfer(msg.sender, _amount);
        emit Withdraw(msg.sender, _amount);
    }

    ///@notice withdraw all TOKEN and harvest rewardToken
    function withdrawAllAndHarvest() external {
        _withdraw(_balances[msg.sender]);
        getReward();
    }


    ///@notice User harvest function called from distribution (voter allows harvest on multiple gauges)
    function getReward(address _user) public nonReentrant onlyDistribution updateReward(_user) {
        uint256 reward = rewards[_user];
        if (reward > 0) {
            rewards[_user] = 0;
            rewardToken.safeTransfer(_user, reward);
            emit Harvest(_user, reward);
        }

        if (gaugeRewarder != address(0)) {
            IRewarder(gaugeRewarder).onReward(_user, _user, _balances[_user]);
        }
    }

    ///@notice User harvest function
    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardToken.safeTransfer(msg.sender, reward);
            emit Harvest(msg.sender, reward);
        }

        if (gaugeRewarder != address(0)) {
            IRewarder(gaugeRewarder).onReward(msg.sender, msg.sender, _balances[msg.sender]);
        }
    }








    /* -----------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
                                    DISTRIBUTION
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    ----------------------------------------------------------------------------- */


    /// @dev Receive rewards from distribution

    function notifyRewardAmount(address token, uint256 reward) external nonReentrant isNotEmergency onlyDistribution updateReward(address(0)) {
        require(token == address(rewardToken), "not rew token");
        rewardToken.safeTransferFrom(DISTRIBUTION, address(this), reward);

        if (block.timestamp >= _periodFinish) {
            rewardRate = reward / DURATION;
        } else {
            uint256 remaining = _periodFinish - block.timestamp;
            uint256 leftover = remaining * rewardRate;
            rewardRate = (reward + leftover) / DURATION;
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardToken.balanceOf(address(this));
        require(rewardRate <= balance / DURATION, "Provided reward too high");

        lastUpdateTime = block.timestamp;
        _periodFinish = block.timestamp + DURATION;
        emit RewardAdded(reward);
    }


    function claimFees() external nonReentrant returns (uint256 claimed0, uint256 claimed1) {
        return _claimFees();
    }

     function _claimFees() internal returns (uint256 claimed0, uint256 claimed1) {
        if (!isForPair) {
            return (0, 0);
        }
        address _token = address(TOKEN);
        (claimed0, claimed1) = IPair(_token).claimFees();
        if (claimed0 > 0 || claimed1 > 0) {

            uint256 _fees0 = claimed0;
            uint256 _fees1 = claimed1;

            (address _token0, address _token1) = IPair(_token).tokens();

            if (_fees0  > 0) {
                IERC20(_token0).approve(internal_bribe, 0);
                IERC20(_token0).approve(internal_bribe, _fees0);
                IBribe(internal_bribe).notifyRewardAmount(_token0, _fees0);
            }
            if (_fees1  > 0) {
                IERC20(_token1).approve(internal_bribe, 0);
                IERC20(_token1).approve(internal_bribe, _fees1);
                IBribe(internal_bribe).notifyRewardAmount(_token1, _fees1);
            }
            emit ClaimFees(msg.sender, claimed0, claimed1);
        }
    }



}

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

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

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

interface IBribe {
    function _deposit(uint amount, uint tokenId) external;
    function _withdraw(uint amount, uint tokenId) external;
    function getRewardForOwner(uint tokenId, address[] memory tokens) external;
    function getRewardForAddress(address _owner, address[] memory tokens) external;
    function notifyRewardAmount(address token, uint amount) external;
    function left(address token) external view returns (uint);
}

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

interface IPair {
    function metadata() external view returns (uint dec0, uint dec1, uint r0, uint r1, bool st, address t0, address t1);
    function claimFees() external returns (uint, uint);
    function tokens() external view returns (address, address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function burn(address to) external returns (uint amount0, uint amount1);
    function mint(address to) external returns (uint liquidity);
    function getReserves() external view returns (uint _reserve0, uint _reserve1, uint _blockTimestampLast);
    function getAmountOut(uint, address) external view returns (uint);

    function name() external view returns(string memory);
    function symbol() external view returns(string memory);
    function totalSupply() external view returns (uint);
    function decimals() external view returns (uint8);

    function claimable0(address _user) external view returns (uint);
    function claimable1(address _user) external view returns (uint);

    function isStable() external view returns(bool);


}

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

library Constants {
    uint256 internal constant EPOCH_LENGTH = 7 days;
}

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

library Math {
    function max(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }
    function min(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
    function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
        uint256 x = 0;
        for (uint256 y = 1 << 255; y > 0; y >>= 3) {
            x <<= 1;
            uint256 z = 3 * x * (x + 1) + 1;
            if (n / y >= z) {
                n -= y * z;
                x += 1;
            }
        }
        return x;
    }}
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000a04bc7140c26fc9bb1f36b1a604c7a5a88fb0e70000000000000000000000000aa30f0977620d4d46b3bb3cf0794fe645d576ca300000000000000000000000003281b6f11d943157a973cdb6b39b747501bdbba000000000000000000000000c1ae2779903cfb84cb9dee5c03eceac32dc407f20000000000000000000000003a8a776c1fce689ae1045ccaf8a87de1cac0cc8b000000000000000000000000b7ddcb5832ce2e8f6a80baabe9590ccdb7d358110000000000000000000000000000000000000000000000000000000000000001

-----Decoded View---------------
Arg [0] : _rewardToken (address): 0xA04BC7140c26fc9BB1F36B1A604C7A5a88fb0E70
Arg [1] : _ve (address): 0xAA30F0977620D4d46B3Bb3Cf0794Fe645d576CA3
Arg [2] : _token (address): 0x03281b6F11D943157A973cDB6B39B747501BDBBa
Arg [3] : _distribution (address): 0xC1AE2779903cfB84CB9DEe5c03EcEAc32dc407F2
Arg [4] : _internal_bribe (address): 0x3a8a776c1fcE689ae1045cCaf8a87De1caC0cC8b
Arg [5] : _external_bribe (address): 0xB7DdcB5832ce2e8f6a80baABE9590CCdb7D35811
Arg [6] : _isForPair (bool): True

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000a04bc7140c26fc9bb1f36b1a604c7a5a88fb0e70
Arg [1] : 000000000000000000000000aa30f0977620d4d46b3bb3cf0794fe645d576ca3
Arg [2] : 00000000000000000000000003281b6f11d943157a973cdb6b39b747501bdbba
Arg [3] : 000000000000000000000000c1ae2779903cfb84cb9dee5c03eceac32dc407f2
Arg [4] : 0000000000000000000000003a8a776c1fce689ae1045ccaf8a87de1cac0cc8b
Arg [5] : 000000000000000000000000b7ddcb5832ce2e8f6a80baabe9590ccdb7d35811
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000001