/**
 *Submitted for verification at Etherscan.io on 2022-12-06
*/

// Sources flattened with hardhat v2.9.0 https://hardhat.org

// File @openzeppelin/contracts/utils/math/Math.sol@v4.5.0

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

// File @openzeppelin/contracts/security/ReentrancyGuard.sol@v4.5.0

// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v4.5.0

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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);
}

// File @openzeppelin/contracts/utils/Context.sol@v4.5.0

// 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;
    }
}

// File @openzeppelin/contracts/access/Ownable.sol@v4.5.0

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable 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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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);
    }
}

// File contracts/interface/IGauge.sol

pragma solidity 0.8.10;

interface IGauge {
    function notifyRewardAmount(address token, uint256 amount) external;

    function getReward(address account) external;

    function claimFees() external returns (uint256 claimed0, uint256 claimed1);

    function left(address token) external view returns (uint256);
}

// File contracts/interface/IGaugeFactory.sol

pragma solidity 0.8.10;

interface IGaugeFactory {
    function createGauge(
        address,
        address,
        address
    ) external returns (address);
}

// File @openzeppelin/contracts/utils/Address.sol@v4.5.0

// OpenZeppelin Contracts (last updated v4.5.0) (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol@v4.5.0

// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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));
        }
    }

    /**
     * @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");
        }
    }
}

// File @openzeppelin/contracts/utils/math/SafeMath.sol@v4.5.0

// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File @openzeppelin/contracts/utils/structs/EnumerableSet.sol@v4.5.0

// OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}

// File contracts/tools/TransferHelper.sol

pragma solidity 0.8.10;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: APPROVE_FAILED");
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FAILED");
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FROM_FAILED");
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, "TransferHelper: ETH_TRANSFER_FAILED");
    }
}

// File contracts/interface/IToken.sol

pragma solidity =0.8.10;

interface IToken is IERC20 {
    function mint(address to, uint256 amount) external returns (bool);

    function burn(uint256 _amount) external;
}

// File contracts/interface/ICheckPermission.sol

pragma solidity =0.8.10;

interface ICheckPermission {
    function operator() external view returns (address);

    function owner() external view returns (address);

    function check(address _target) external view returns (bool);
}

// File contracts/tools/Operatable.sol

pragma solidity =0.8.10;

// seperate owner and operator, operator is for daily devops, only owner can update operator
contract Operatable is Ownable {
    event SetOperator(address indexed oldOperator, address indexed newOperator);

    address public operator;

    mapping(address => bool) public contractWhiteList;

    constructor() {
        operator = msg.sender;
        emit SetOperator(address(0), operator);
    }

    modifier onlyOperator() {
        require(msg.sender == operator, "not operator");
        _;
    }

    function setOperator(address newOperator) public onlyOwner {
        require(newOperator != address(0), "bad new operator");
        address oldOperator = operator;
        operator = newOperator;
        emit SetOperator(oldOperator, newOperator);
    }

    // File: @openzeppelin/contracts/utils/Address.sol
    function isContract(address account) public view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != 0x0 && codehash != accountHash);
    }

    function addContract(address _target) public onlyOperator {
        contractWhiteList[_target] = true;
    }

    function removeContract(address _target) public onlyOperator {
        contractWhiteList[_target] = false;
    }

    //Do not ban access to the user, need to be in the whitelist contract address to be able to access
    function check(address _target) public view returns (bool) {
        if (isContract(_target)) {
            return contractWhiteList[_target];
        }
        return true;
    }
}

// File contracts/tools/CheckPermission.sol

pragma solidity =0.8.10;

// seperate owner and operator, operator is for daily devops, only owner can update operator
contract CheckPermission is ICheckPermission {
    Operatable public operatable;

    event SetOperatorContract(address indexed oldOperator, address indexed newOperator);

    constructor(address _oper) {
        operatable = Operatable(_oper);
        emit SetOperatorContract(address(0), _oper);
    }

    modifier onlyOwner() {
        require(operatable.owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    modifier onlyOperator() {
        require(operatable.operator() == msg.sender, "not operator");
        _;
    }

    modifier onlyAEOWhiteList() {
        require(check(msg.sender), "aeo or whitelist");
        _;
    }

    function operator() public view override returns (address) {
        return operatable.operator();
    }

    function owner() public view override returns (address) {
        return operatable.owner();
    }

    function setOperContract(address _oper) public onlyOwner {
        require(_oper != address(0), "bad new operator");
        address oldOperator = address(operatable);
        operatable = Operatable(_oper);
        emit SetOperatorContract(oldOperator, _oper);
    }

    function check(address _target) public view override returns (bool) {
        return operatable.check(_target);
    }
}

// File contracts/dao/TokenReward.sol

pragma solidity =0.8.10;

abstract contract TokenReward is CheckPermission {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    event SetPool(address indexed pool, uint256 point);
    event AddPool(address indexed pool, uint256 point);

    IToken public swapToken;

    uint256 public tokenPerBlock;
    uint256 public immutable startBlock;
    uint256 public periodEndBlock;
    // How many blocks (90 days) are halved 2592000
    uint256 public period;

    uint256 public mintMulti;

    uint256 public minTokenReward = 1.75e17;

    constructor(
        address _operatorMsg,
        IToken _swapToken,
        uint256 _tokenPerBlock,
        uint256 _startBlock,
        uint256 _period
    ) CheckPermission(_operatorMsg) {
        require(address(_swapToken) != address(0), "swapToken is 0");
        swapToken = _swapToken;
        tokenPerBlock = _tokenPerBlock;
        startBlock = _startBlock;
        period = _period;
        periodEndBlock = _startBlock.add(_period);
        mintMulti = 1000;
    }

    modifier reduceBlockReward() {
        if (block.number > startBlock && block.number >= periodEndBlock) {
            if (tokenPerBlock > minTokenReward) {
                tokenPerBlock = tokenPerBlock.mul(80).div(100);
            }
            if (tokenPerBlock < minTokenReward) {
                tokenPerBlock = minTokenReward;
            }
            periodEndBlock = block.number.add(period);
        }
        _;
    }

    function setHalvingPeriod(uint256 _block) public onlyOperator {
        period = _block;
    }

    function setMintMulti(uint256 _multi) public onlyOperator {
        mintMulti = _multi;
    }

    function setMinTokenReward(uint256 _reward) public onlyOperator {
        minTokenReward = _reward;
    }

    // Set the number of swap produced by each block
    function setTokenPerBlock(uint256 _newPerBlock, bool _withUpdate) public onlyOperator {
        tokenPerBlock = _newPerBlock;
        if (_withUpdate) {
            massUpdatePools();
        }
    }

    // Safe swap token transfer function, just in case if rounding error causes pool to not have enough swaps.
    function _safeTokenTransfer(address _to, uint256 _amount) internal {
        _mintRewardToken(_amount);
        uint256 bal = swapToken.balanceOf(address(this));
        if (_amount > bal) {
            _amount = bal;
        }
        TransferHelper.safeTransfer(address(swapToken), _to, _amount);
    }

    function _mintRewardToken(uint256 _amount) private {
        uint256 bal = swapToken.balanceOf(address(this));
        if (bal < _amount) {
            swapToken.mint(address(this), _amount.mul(mintMulti));
        }
    }

    function massUpdatePools() public virtual;
}

// File contracts/interface/IVeToken.sol

pragma solidity 0.8.10;

interface IVeToken {
    function token() external view returns (address);

    function tokenOfOwnerByIndex(address _owner, uint256 _tokenIndex) external view returns (uint256);

    function balanceOfNFT(uint256) external view returns (uint256);

    function isApprovedOrOwner(address, uint256) external view returns (bool);

    function ownerOf(uint256) external view returns (address);

    function transferFrom(
        address,
        address,
        uint256
    ) external;

    function voting(uint256 tokenId) external;

    function abstain(uint256 tokenId) external;
}

// File contracts/dao/AbstractBoost.sol

pragma solidity 0.8.10;

abstract contract AbstractBoost is TokenReward {
    using SafeMath for uint256;

    event Voted(address indexed voter, uint256 tokenId, int256 weight);
    event Abstained(uint256 tokenId, int256 weight);
    event ControllerAdded(address _address);
    event ControllerRemoved(address _address);

    mapping(address => bool) public controllers;

    uint256 public totalWeight; // total voting weight

    address public immutable veToken; // the ve token that governs these contracts
    address internal immutable _base;

    mapping(address => int256) public weights; // pool => weight
    mapping(uint256 => mapping(address => int256)) public votes; // nft => pool => votes
    mapping(uint256 => address[]) public poolVote; // nft => pools
    mapping(uint256 => uint256) public usedWeights; // nft => total voting weight of user

    constructor(
        address _operatorMsg,
        address __ve,
        IToken _swapToken,
        uint256 _tokenPerBlock,
        uint256 _startBlock,
        uint256 _period
    ) TokenReward(_operatorMsg, _swapToken, _tokenPerBlock, _startBlock, _period) {
        veToken = __ve;
        _base = IVeToken(__ve).token();
    }

    function getPoolVote(uint256 tokenId) public view returns (address[] memory) {
        return poolVote[tokenId];
    }

    function reset(uint256 _tokenId) external {
        require(IVeToken(veToken).isApprovedOrOwner(msg.sender, _tokenId), "no owner");
        require(usedWeights[_tokenId] > 0, "use weight > 0");
        _reset(_tokenId);
        IVeToken(veToken).abstain(_tokenId);
    }

    function _reset(uint256 _tokenId) internal {
        address[] storage _poolVote = poolVote[_tokenId];
        uint256 _poolVoteCnt = _poolVote.length;
        int256 _totalWeight = 0;

        for (uint256 i = 0; i < _poolVoteCnt; i++) {
            address _pool = _poolVote[i];
            int256 _votes = votes[_tokenId][_pool];

            if (_votes != 0) {
                _updatePoolInfo(_pool);
                weights[_pool] -= _votes;
                votes[_tokenId][_pool] -= _votes;
                if (_votes > 0) {
                    _totalWeight += _votes;
                } else {
                    _totalWeight -= _votes;
                }
                emit Abstained(_tokenId, _votes);
            }
        }
        totalWeight -= uint256(_totalWeight);
        usedWeights[_tokenId] = 0;
        delete poolVote[_tokenId];
    }

    function _vote(
        uint256 _tokenId,
        address[] memory _poolVote,
        int256[] memory _weights
    ) internal {
        _reset(_tokenId);
        uint256 _poolCnt = _poolVote.length;
        int256 _weight = int256(IVeToken(veToken).balanceOfNFT(_tokenId));
        int256 _totalVoteWeight = 0;
        int256 _totalWeight = 0;
        int256 _usedWeight = 0;

        for (uint256 i = 0; i < _poolCnt; i++) {
            _totalVoteWeight += _weights[i] > 0 ? _weights[i] : -_weights[i];
        }
        require(_totalVoteWeight > 0, "total weight is 0");

        for (uint256 i = 0; i < _poolCnt; i++) {
            address _pool = _poolVote[i];

            if (_isGaugeForPool(_pool)) {
                int256 _poolWeight = (_weights[i] * _weight) / _totalVoteWeight;
                require(votes[_tokenId][_pool] == 0, "token pool is 0");
                require(_poolWeight != 0, "weight is 0");
                _updatePoolInfo(_pool);

                poolVote[_tokenId].push(_pool);

                weights[_pool] += _poolWeight;
                votes[_tokenId][_pool] += _poolWeight;
                if (_poolWeight > 0) {} else {
                    _poolWeight = -_poolWeight;
                }
                _usedWeight += _poolWeight;
                _totalWeight += _poolWeight;
                emit Voted(msg.sender, _tokenId, _poolWeight);
            }
        }
        if (_usedWeight > 0) IVeToken(veToken).voting(_tokenId);
        totalWeight += uint256(_totalWeight);
        usedWeights[_tokenId] = uint256(_usedWeight);
    }

    function poke(uint256 _tokenId) external {
        require(IVeToken(veToken).isApprovedOrOwner(msg.sender, _tokenId), "no owner");
        require(usedWeights[_tokenId] > 0, "use weight > 0");
        address[] memory _poolVote = poolVote[_tokenId];
        uint256 _poolCnt = _poolVote.length;
        int256[] memory _weights = new int256[](_poolCnt);

        for (uint256 i = 0; i < _poolCnt; i++) {
            _weights[i] = votes[_tokenId][_poolVote[i]];
        }
        _reset(_tokenId);
        IVeToken(veToken).abstain(_tokenId);
        _vote(_tokenId, _poolVote, _weights);
    }

    function vote(
        uint256 tokenId,
        address[] calldata _poolVote,
        int256[] calldata _weights
    ) external {
        require(IVeToken(veToken).isApprovedOrOwner(msg.sender, tokenId), "no owner");
        require(_poolVote.length == _weights.length);
        _vote(tokenId, _poolVote, _weights);
    }

    function addController(address _address) external onlyOperator {
        require(_address != address(0), "0 address");
        require(controllers[_address] == false, "Address already exists");
        controllers[_address] = true;
        emit ControllerAdded(_address);
    }

    function removeController(address _address) external onlyOperator {
        require(controllers[_address] == true, "Address no exist");
        delete controllers[_address];
        emit ControllerRemoved(_address);
    }

    function _updatePoolInfo(address _pool) internal virtual;

    function _isGaugeForPool(address _pool) internal view virtual returns (bool);
}

// File contracts/dao/Boost.sol

pragma solidity 0.8.10;

contract Boost is ReentrancyGuard, AbstractBoost {
    using SafeMath for uint256;

    event GaugeCreated(address indexed gauge, address creator, address indexed pool);

    event NotifyReward(address indexed sender, address indexed reward, uint256 amount);
    event DistributeReward(address indexed sender, address indexed gauge, uint256 amount);

    // Info of each pool.
    struct PoolInfo {
        address lpToken;
        uint256 allocPoint;
        uint256 lastRewardBlock;
    }

    address public immutable gaugeFactory;
    uint256 public totalAllocPoint = 0;
    PoolInfo[] public poolInfo;
    // pid corresponding address
    mapping(address => uint256) public lpOfPid;

    uint256 public mintDuration = 7 * 28800; // rewards are released over 7 days

    mapping(address => address) public gauges; // pool => gauge
    mapping(address => address) public poolForGauge; // gauge => pool
    mapping(address => bool) public isGauge;

    constructor(
        address _operatorMsg,
        address __ve,
        address _gauges,
        IToken _swapToken,
        uint256 _tokenPerBlock,
        uint256 _startBlock,
        uint256 _period
    ) AbstractBoost(_operatorMsg, __ve, _swapToken, _tokenPerBlock, _startBlock, _period) {
        gaugeFactory = _gauges;
    }

    function poolLength() public view returns (uint256) {
        return poolInfo.length;
    }

    function createGauge(
        address _pool,
        uint256 _allocPoint,
        bool _withUpdate
    ) external onlyOperator returns (address) {
        require(gauges[_pool] == address(0x0), "exists");

        require(address(_pool) != address(0), "_lpToken is the zero address");
        require(IERC20(_pool).totalSupply() >= 0, "is erc20");
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({lpToken: _pool, allocPoint: _allocPoint, lastRewardBlock: lastRewardBlock}));
        lpOfPid[address(_pool)] = poolLength() - 1;

        address _gauge = IGaugeFactory(gaugeFactory).createGauge(_pool, veToken, address(swapToken));
        IERC20(address(swapToken)).approve(_gauge, type(uint256).max);
        gauges[_pool] = _gauge;
        poolForGauge[_gauge] = _pool;
        isGauge[_gauge] = true;
        _updateForGauge(_gauge);
        emit GaugeCreated(_gauge, msg.sender, _pool);
        return _gauge;
    }

    function set(
        uint256 _pid,
        uint256 _allocPoint,
        bool _withUpdate
    ) public {
        require(controllers[msg.sender] || msg.sender == operator(), "no auth");

        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
        poolInfo[_pid].allocPoint = _allocPoint;
        if (_withUpdate) {
            massUpdatePools();
        }
    }

    function setMitDuration(uint256 _duration) public onlyOperator {
        mintDuration = _duration;
    }

    function massUpdatePools() public override {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public reduceBlockReward {
        require(totalAllocPoint > 0, "total=0");
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = IERC20(pool.lpToken).balanceOf(gauges[pool.lpToken]);
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        if (tokenPerBlock <= 0) {
            return;
        }
        uint256 tokenReward = tokenPerBlock.mul(pool.allocPoint).div(totalAllocPoint);
        if (IERC20(swapToken).balanceOf(gauges[pool.lpToken]) < tokenReward.mul(mintDuration)) {
            bool minRet = swapToken.mint(address(this), tokenReward.mul(mintDuration));
            if (minRet) {
                TransferHelper.safeTransfer(address(swapToken), gauges[pool.lpToken], tokenReward.mul(mintDuration));
                IGauge(gauges[pool.lpToken]).notifyRewardAmount(address(swapToken), tokenReward);
            }
            pool.lastRewardBlock = block.number;
        }
    }

    function updateAll() external {
        for (uint256 i = 0; i < poolLength(); i++) {
            PoolInfo memory pool = poolInfo[i];
            _updateForGauge(gauges[pool.lpToken]);
        }
    }

    function _updateForGauge(address _gauge) internal {
        address _pool = poolForGauge[_gauge];
        updatePool(lpOfPid[_pool]);
    }

    function claimRewards(address[] memory _gauges) external {
        for (uint256 i = 0; i < _gauges.length; i++) {
            IGauge(_gauges[i]).getReward(msg.sender);
        }
    }

    function distribute(address _gauge) public {
        _updateForGauge(_gauge);
    }

    function _updatePoolInfo(address _pool) internal override {
        _updateForGauge(gauges[_pool]);
    }

    function _isGaugeForPool(address _pool) internal view override returns (bool) {
        return isGauge[gauges[_pool]];
    }
}