// Sources flattened with hardhat v2.17.3 https://hardhat.org

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

// File contracts/core/interfaces/IVaultUtils.sol

interface IVaultUtils {
    function updateCumulativeFundingRate(address _collateralToken, address _indexToken) external returns (bool);
    function validateIncreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external view;
    function validateDecreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external view;
    function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
    function getEntryFundingRate(address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256);
    function getPositionFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _sizeDelta) external view returns (uint256);
    function getFundingFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _size, uint256 _entryFundingRate) external view returns (uint256);
    function getBuyUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getSellUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getSwapFeeBasisPoints(address _tokenIn, address _tokenOut, uint256 _usdgAmount) external view returns (uint256);
    function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
}


// File contracts/core/interfaces/IVault.sol

interface IVault {
    function isInitialized() external view returns (bool);
    function isSwapEnabled() external view returns (bool);
    function isLeverageEnabled() external view returns (bool);

    function setVaultUtils(IVaultUtils _vaultUtils) external;
    function setError(uint256 _errorCode, string calldata _error) external;

    function router() external view returns (address);
    function usdg() external view returns (address);
    function gov() external view returns (address);

    function whitelistedTokenCount() external view returns (uint256);
    function maxLeverage() external view returns (uint256);

    function minProfitTime() external view returns (uint256);
    function hasDynamicFees() external view returns (bool);
    function fundingInterval() external view returns (uint256);
    function totalTokenWeights() external view returns (uint256);
    function getTargetUsdgAmount(address _token) external view returns (uint256);

    function inManagerMode() external view returns (bool);
    function inPrivateLiquidationMode() external view returns (bool);

    function maxGasPrice() external view returns (uint256);

    function approvedRouters(address _account, address _router) external view returns (bool);
    function isLiquidator(address _account) external view returns (bool);
    function isManager(address _account) external view returns (bool);

    function minProfitBasisPoints(address _token) external view returns (uint256);
    function tokenBalances(address _token) external view returns (uint256);
    function lastFundingTimes(address _token) external view returns (uint256);

    function setMaxLeverage(uint256 _maxLeverage) external;
    function setInManagerMode(bool _inManagerMode) external;
    function setManager(address _manager, bool _isManager) external;
    function setIsSwapEnabled(bool _isSwapEnabled) external;
    function setIsLeverageEnabled(bool _isLeverageEnabled) external;
    function setMaxGasPrice(uint256 _maxGasPrice) external;
    function setUsdgAmount(address _token, uint256 _amount) external;
    function setBufferAmount(address _token, uint256 _amount) external;
    function setMaxGlobalShortSize(address _token, uint256 _amount) external;
    function setInPrivateLiquidationMode(bool _inPrivateLiquidationMode) external;
    function setLiquidator(address _liquidator, bool _isActive) external;

    function setFundingRate(uint256 _fundingInterval, uint256 _fundingRateFactor, uint256 _stableFundingRateFactor) external;

    function setFees(
        uint256 _taxBasisPoints,
        uint256 _stableTaxBasisPoints,
        uint256 _mintBurnFeeBasisPoints,
        uint256 _swapFeeBasisPoints,
        uint256 _stableSwapFeeBasisPoints,
        uint256 _marginFeeBasisPoints,
        uint256 _liquidationFeeUsd,
        uint256 _minProfitTime,
        bool _hasDynamicFees
    ) external;

    function setTokenConfig(
        address _token,
        uint256 _tokenDecimals,
        uint256 _redemptionBps,
        uint256 _minProfitBps,
        uint256 _maxUsdgAmount,
        bool _isStable,
        bool _isShortable
    ) external;

    function setPriceFeed(address _priceFeed) external;
    function withdrawFees(address _token, address _receiver) external returns (uint256);

    function directPoolDeposit(address _token) external;
    function buyUSDG(address _token, address _receiver) external returns (uint256);
    function sellUSDG(address _token, address _receiver) external returns (uint256);
    function swap(address _tokenIn, address _tokenOut, address _receiver) external returns (uint256);
    function increasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external;
    function decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external returns (uint256);
    function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
    function liquidatePosition(address _account, address _collateralToken, address _indexToken, bool _isLong, address _feeReceiver) external;
    function tokenToUsdMin(address _token, uint256 _tokenAmount) external view returns (uint256);

    function priceFeed() external view returns (address);
    function fundingRateFactor() external view returns (uint256);
    function stableFundingRateFactor() external view returns (uint256);
    function cumulativeFundingRates(address _token) external view returns (uint256);
    function getNextFundingRate(address _token) external view returns (uint256);
    function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);

    function liquidationFeeUsd() external view returns (uint256);
    function taxBasisPoints() external view returns (uint256);
    function stableTaxBasisPoints() external view returns (uint256);
    function mintBurnFeeBasisPoints() external view returns (uint256);
    function swapFeeBasisPoints() external view returns (uint256);
    function stableSwapFeeBasisPoints() external view returns (uint256);
    function marginFeeBasisPoints() external view returns (uint256);

    function allWhitelistedTokensLength() external view returns (uint256);
    function allWhitelistedTokens(uint256) external view returns (address);
    function whitelistedTokens(address _token) external view returns (bool);
    function stableTokens(address _token) external view returns (bool);
    function shortableTokens(address _token) external view returns (bool);
    function feeReserves(address _token) external view returns (uint256);
    function globalShortSizes(address _token) external view returns (uint256);
    function globalShortAveragePrices(address _token) external view returns (uint256);
    function maxGlobalShortSizes(address _token) external view returns (uint256);
    function tokenDecimals(address _token) external view returns (uint256);
    function tokenWeights(address _token) external view returns (uint256);
    function guaranteedUsd(address _token) external view returns (uint256);
    function poolAmounts(address _token) external view returns (uint256);
    function bufferAmounts(address _token) external view returns (uint256);
    function reservedAmounts(address _token) external view returns (uint256);
    function usdgAmounts(address _token) external view returns (uint256);
    function maxUsdgAmounts(address _token) external view returns (uint256);
    function getRedemptionAmount(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getMaxPrice(address _token) external view returns (uint256);
    function getMinPrice(address _token) external view returns (uint256);

    function getDelta(address _indexToken, uint256 _size, uint256 _averagePrice, bool _isLong, uint256 _lastIncreasedTime) external view returns (bool, uint256);
    function getPosition(address _account, address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256, uint256, uint256, uint256, uint256, uint256, bool, uint256);
}


// File contracts/core/interfaces/IGlpManager.sol

pragma solidity 0.6.12;
interface IGlpManager {
    function glp() external view returns (address);
    function usdg() external view returns (address);
    function vault() external view returns (IVault);
    function cooldownDuration() external returns (uint256);
    function getAumInUsdg(bool maximise) external view returns (uint256);
    function lastAddedAt(address _account) external returns (uint256);
    function addLiquidity(address _token, uint256 _amount, uint256 _minUsdg, uint256 _minGlp) external returns (uint256);
    function addLiquidityForAccount(address _fundingAccount, address _account, address _token, uint256 _amount, uint256 _minUsdg, uint256 _minGlp) external returns (uint256);
    function removeLiquidity(address _tokenOut, uint256 _glpAmount, uint256 _minOut, address _receiver) external returns (uint256);
    function removeLiquidityForAccount(address _account, address _tokenOut, uint256 _glpAmount, uint256 _minOut, address _receiver) external returns (uint256);
    function setShortsTrackerAveragePriceWeight(uint256 _shortsTrackerAveragePriceWeight) external;
    function setCooldownDuration(uint256 _cooldownDuration) external;
}


// File contracts/libraries/math/SafeMath.sol

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @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 sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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 mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


// File contracts/libraries/token/IERC20.sol

/**
 * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, 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 contracts/libraries/utils/Address.sol

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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 v3.3._
     */
    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 v3.3._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts/libraries/token/SafeERC20.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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File contracts/access/Governable.sol

contract Governable {
    address public gov;

    constructor() public {
        gov = msg.sender;
    }

    modifier onlyGov() {
        require(msg.sender == gov, "Governable: forbidden");
        _;
    }

    function setGov(address _gov) external onlyGov {
        gov = _gov;
    }
}


// File contracts/libraries/utils/ReentrancyGuard.sol

/**
 * @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].
 */
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 () internal {
        _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 make 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 contracts/staking/interfaces/IRewardTracker.sol

interface IRewardTracker {
    function depositBalances(address _account, address _depositToken) external view returns (uint256);
    function stakedAmounts(address _account) external view returns (uint256);
    function updateRewards() external;
    function stake(address _depositToken, uint256 _amount) external;
    function stakeForAccount(address _fundingAccount, address _account, address _depositToken, uint256 _amount) external;
    function unstake(address _depositToken, uint256 _amount) external;
    function unstakeForAccount(address _account, address _depositToken, uint256 _amount, address _receiver) external;
    function tokensPerInterval() external view returns (uint256);
    function claim(address _receiver) external returns (uint256);
    function claimForAccount(address _account, address _receiver) external returns (uint256);
    function claimable(address _account) external view returns (uint256);
    function averageStakedAmounts(address _account) external view returns (uint256);
    function cumulativeRewards(address _account) external view returns (uint256);
}


// File contracts/tokens/interfaces/IMintable.sol

interface IMintable {
    function isMinter(address _account) external returns (bool);
    function setMinter(address _minter, bool _isActive) external;
    function mint(address _account, uint256 _amount) external;
    function burn(address _account, uint256 _amount) external;
}


// File contracts/tokens/interfaces/IWETH.sol

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}


// File contracts/staking/RewardRouterV4.sol

/**
 * @title RewardRouterV4
 * @dev Implements reward handling for staking and providing liquidity.
 */
contract RewardRouterV4 is ReentrancyGuard, Governable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address payable;

    bool public isInitialized;

    address public weth;
    address public bmx;
    address public opBmx; // option-BMX or oBMX
    address public bnBmx; // multiplier points
    address public blt; // BMX Liquidity Provider token

    address public stakedBmxTracker;
    address public bonusBmxTracker;
    address public feeBmxTracker;
    address public stakedBltTracker;
    address public feeBltTracker;

    address public bltManager;

    // Keeping original event names so subgraphs don't need to be updated
    event StakeGmx(address account, address token, uint256 amount);
    event UnstakeGmx(address account, address token, uint256 amount);
    event StakeGlp(address account, uint256 amount);
    event UnstakeGlp(address account, uint256 amount);

    /**
     * @notice Handles receiving ETH directly to the contract.
     * Reverts if the sender is not the wETH contract.
     */
    receive() external payable {
        require(msg.sender == weth, "Router: invalid sender");
    }

    /**
     * @notice Initializes the contract with provided addresses.
     * Can only be called once by governance.
     * @param _weth Address of the Wrapped ETH token.
     * @param _bmx Address of the BMX token.
     * @param _opBmx Address of the option-BMX token.
     * @param _bnBmx Address of the multiplier points token.
     * @param _blt Address of the BMX Liquidity Provider token.
     * @param _stakedBmxTracker Address of the staked BMX tracker contract.
     * @param _bonusBmxTracker Address of the bonus BMX tracker contract.
     * @param _feeBmxTracker Address of the fee BMX tracker contract.
     * @param _feeBltTracker Address of the fee BLT tracker contract.
     * @param _stakedBltTracker Address of the staked BLT tracker contract.
     * @param _bltManager Address of the BLT manager contract.
     */
    function initialize(
        address _weth,
        address _bmx,
        address _opBmx,
        address _bnBmx,
        address _blt,
        address _stakedBmxTracker,
        address _bonusBmxTracker,
        address _feeBmxTracker,
        address _feeBltTracker,
        address _stakedBltTracker,
        address _bltManager
    ) external onlyGov {
        require(!isInitialized, "RewardRouter: already initialized");
        isInitialized = true;

        weth = _weth;
        bmx = _bmx;
        opBmx = _opBmx;
        bnBmx = _bnBmx;
        blt = _blt;

        stakedBmxTracker = _stakedBmxTracker;
        bonusBmxTracker = _bonusBmxTracker;
        feeBmxTracker = _feeBmxTracker;
        feeBltTracker = _feeBltTracker;
        stakedBltTracker = _stakedBltTracker;

        bltManager = _bltManager;
    }

    /**
     * @notice Allows governance to withdraw tokens sent to this contract.
     * Example: To help users who accidentally send their tokens to this contract
     * @param _token The address of the token to withdraw.
     * @param _account The address to send the token to.
     * @param _amount The amount of tokens to withdraw.
     */
    function withdrawToken(address _token, address _account, uint256 _amount) external onlyGov {
        IERC20(_token).safeTransfer(_account, _amount);
    }

    /**
     * @notice Stakes BMX for multiple accounts.
     * @dev This function allows batch staking of BMX for different accounts. Can only be called by governance.
     * @param _accounts Array of addresses for which BMX tokens are to be staked.
     * @param _amounts Array of amounts of BMX tokens to be staked for each corresponding account in `_accounts`.
     */
    function batchStakeBmxForAccount(address[] memory _accounts, uint256[] memory _amounts) external nonReentrant onlyGov {
        address _bmx = bmx;
        for (uint256 i = 0; i < _accounts.length; i++) {
            _stakeBmx(msg.sender, _accounts[i], _bmx, _amounts[i]);
        }
    }

    /**
     * @notice Stakes BMX on behalf of a specified account.
     * @dev This function allows governance to stake BMX for a specified account. Can only be called by governance.
     * @param _account The address of the account for which BMX tokens are to be staked.
     * @param _amount The amount of BMX tokens to stake.
     */
    function stakeBmxForAccount(address _account, uint256 _amount) external nonReentrant onlyGov {
        _stakeBmx(msg.sender, _account, bmx, _amount);
    }

    /**
     * @notice Allows a user to stake their BMX.
     * @dev This function lets an account stake BMX tokens for itself.
     * Calls `_stakeBmx` internally.
     * @param _amount The amount of BMX tokens the user wishes to stake.
     */
    function stakeBmx(uint256 _amount) external nonReentrant {
        _stakeBmx(msg.sender, msg.sender, bmx, _amount);
    }

    /**
     * @notice Allows a user to unstake their BMX.
     * @dev This function lets an account unstake BMX tokens that it has previously staked.
     * Calls `_unstakeBmx` internally.
     * @param _amount The amount of BMX tokens the user wishes to unstake.
     */
    function unstakeBmx(uint256 _amount) external nonReentrant {
        _unstakeBmx(msg.sender, bmx, _amount, true);
    }

    /**
     * @notice Mints and stakes BLT.
     * @dev Allows a user to mint BLT using an underlying token and then stakes the resulting BLT.
     * @param _token The address of the token to be used for minting BLT.
     * @param _amount The amount of the token to mint BLT with.
     * @param _minUsd The minimum USD value expected to receive.
     * @param _minBlt The minimum BLT tokens expected to receive.
     * @return bltAmount The amount of BLT tokens staked.
     */
    function mintAndStakeBlt(address _token, uint256 _amount, uint256 _minUsd, uint256 _minBlt) external nonReentrant returns (uint256) {
        require(_amount > 0, "RewardRouter: invalid _amount");

        address account = msg.sender;
        uint256 bltAmount = IGlpManager(bltManager).addLiquidityForAccount(account, account, _token, _amount, _minUsd, _minBlt);
        IRewardTracker(feeBltTracker).stakeForAccount(account, account, blt, bltAmount);
        IRewardTracker(stakedBltTracker).stakeForAccount(account, account, feeBltTracker, bltAmount);

        emit StakeGlp(account, bltAmount);

        return bltAmount;
    }

    /**
     * @notice Mints and stakes BLT with ETH.
     * @dev Allows a user to mint BLT with ETH and then stakes the resulting BLT.
     * @param _minUsd The minimum USD value expected to receive.
     * @param _minBlt The minimum BLT tokens expected to receive.
     * @return bltAmount The amount of BLT tokens staked.
     */
    function mintAndStakeBltETH(uint256 _minUsd, uint256 _minBlt) external payable nonReentrant returns (uint256) {
        require(msg.value > 0, "RewardRouter: invalid msg.value");

        IWETH(weth).deposit{value: msg.value}();
        IERC20(weth).approve(bltManager, msg.value);

        address account = msg.sender;
        uint256 bltAmount = IGlpManager(bltManager).addLiquidityForAccount(address(this), account, weth, msg.value, _minUsd, _minBlt);

        IRewardTracker(feeBltTracker).stakeForAccount(account, account, blt, bltAmount);
        IRewardTracker(stakedBltTracker).stakeForAccount(account, account, feeBltTracker, bltAmount);

        emit StakeGlp(account, bltAmount);

        return bltAmount;
    }

    /**
     * @notice Unstakes and redeems BLT for an underlying token.
     * @dev Allows a user to unstake BLT tokens and redeem them for an underlying token.
     * @param _tokenOut The address of the underlying token to receive.
     * @param _bltAmount The amount of BLT tokens to unstake and redeem.
     * @param _minOut The minimum amount of the underlying token expected to receive.
     * @param _receiver The address that will receive the underlying tokens.
     * @return amountOut The amount of the underlying tokens received.
     */
    function unstakeAndRedeemBlt(address _tokenOut, uint256 _bltAmount, uint256 _minOut, address _receiver) external nonReentrant returns (uint256) {
        require(_bltAmount > 0, "RewardRouter: invalid _bltAmount");

        address account = msg.sender;
        IRewardTracker(stakedBltTracker).unstakeForAccount(account, feeBltTracker, _bltAmount, account);
        IRewardTracker(feeBltTracker).unstakeForAccount(account, blt, _bltAmount, account);
        uint256 amountOut = IGlpManager(bltManager).removeLiquidityForAccount(account, _tokenOut, _bltAmount, _minOut, _receiver);

        emit UnstakeGlp(account, _bltAmount);

        return amountOut;
    }

    /**
     * @notice Unstakes and redeems BLT for ETH.
     * @dev Allows a user to unstake BLT tokens and redeem them for ETH.
     * @param _bltAmount The amount of BLT tokens to unstake and redeem.
     * @param _minOut The minimum amount of ETH expected to receive.
     * @param _receiver The address that will receive the ETH.
     * @return amountOut The amount of ETH received.
     */
    function unstakeAndRedeemBltETH(uint256 _bltAmount, uint256 _minOut, address payable _receiver) external nonReentrant returns (uint256) {
        require(_bltAmount > 0, "RewardRouter: invalid _bltAmount");

        address account = msg.sender;
        IRewardTracker(stakedBltTracker).unstakeForAccount(account, feeBltTracker, _bltAmount, account);
        IRewardTracker(feeBltTracker).unstakeForAccount(account, blt, _bltAmount, account);
        uint256 amountOut = IGlpManager(bltManager).removeLiquidityForAccount(account, weth, _bltAmount, _minOut, address(this));

        IWETH(weth).withdraw(amountOut);

        _receiver.sendValue(amountOut);

        emit UnstakeGlp(account, _bltAmount);

        return amountOut;
    }

    /**
     * @notice Claims wETH and oBMX rewards from staking BMX and/or BLT.
     * @dev This function allows a user to claim their rewards from all staked (oBMX) and fee (wETH) reward trackers.
     */
    function claim() external nonReentrant {
        address account = msg.sender;

        // Claim wETH
        IRewardTracker(feeBmxTracker).claimForAccount(account, account);
        IRewardTracker(feeBltTracker).claimForAccount(account, account);

        // Claim oBMX
        IRewardTracker(stakedBmxTracker).claimForAccount(account, account);
        IRewardTracker(stakedBltTracker).claimForAccount(account, account);
    }

    /**
     * @notice Claims oBMX rewards from staking BMX and/or BLT.
     * @dev This function allows a user to claim their rewards from all staked reward trackers.
     */
    function claimOpBmx() external nonReentrant {
        address account = msg.sender;

        IRewardTracker(stakedBmxTracker).claimForAccount(account, account);
        IRewardTracker(stakedBltTracker).claimForAccount(account, account);
    }

    /**
     * @notice Claims wETH rewards from staking BMX and/or BLT.
     * @dev This function allows a user to claim their rewards from all fee reward trackers.
     */
    function claimFees() external nonReentrant {
        address account = msg.sender;

        IRewardTracker(feeBmxTracker).claimForAccount(account, account);
        IRewardTracker(feeBltTracker).claimForAccount(account, account);
    }

    /**
     * @notice Handles various reward claims based on the provided params.
     * @dev This function provides a consolidated way to handle multiple actions like claiming oBMX, staking multiplier points, claiming wETH, and converting wETH to ETH.
     * @param _shouldClaimOpBmx If oBMX rewards should be claimed.
     * @param _shouldStakeMultiplierPoints If multiplier points should be staked.
     * @param _shouldClaimWeth If wETH rewards should be claimed.
     * @param _shouldConvertWethToEth If claimed wETH should be converted to ETH.
     */
    function handleRewards(
        bool _shouldClaimOpBmx,
        bool _shouldStakeMultiplierPoints,
        bool _shouldClaimWeth,
        bool _shouldConvertWethToEth
    ) external nonReentrant {
        address account = msg.sender;

        if (_shouldClaimOpBmx) {
            IRewardTracker(stakedBmxTracker).claimForAccount(account, account);
            IRewardTracker(stakedBltTracker).claimForAccount(account, account);
        }
        if (_shouldStakeMultiplierPoints) {
            uint256 bnBmxAmount = IRewardTracker(bonusBmxTracker).claimForAccount(account, account);
            if (bnBmxAmount > 0) {
                IRewardTracker(feeBmxTracker).stakeForAccount(account, account, bnBmx, bnBmxAmount);
            }
        }
        if (_shouldClaimWeth) {
            if (_shouldConvertWethToEth) {
                uint256 weth0 = IRewardTracker(feeBmxTracker).claimForAccount(account, address(this));
                uint256 weth1 = IRewardTracker(feeBltTracker).claimForAccount(account, address(this));

                uint256 wethAmount = weth0.add(weth1);
                IWETH(weth).withdraw(wethAmount);

                payable(account).sendValue(wethAmount);
            } else {
                IRewardTracker(feeBmxTracker).claimForAccount(account, account);
                IRewardTracker(feeBltTracker).claimForAccount(account, account);
            }
        }
    }

    // Internal functions to stake and unstake BMX
    
    function _stakeBmx(address _fundingAccount, address _account, address _token, uint256 _amount) private {
        require(_amount > 0, "RewardRouter: invalid _amount");

        IRewardTracker(stakedBmxTracker).stakeForAccount(_fundingAccount, _account, _token, _amount);
        IRewardTracker(bonusBmxTracker).stakeForAccount(_account, _account, stakedBmxTracker, _amount);
        IRewardTracker(feeBmxTracker).stakeForAccount(_account, _account, bonusBmxTracker, _amount);

        emit StakeGmx(_account, _token, _amount);
    }

    function _unstakeBmx(address _account, address _token, uint256 _amount, bool _shouldReduceBnBmx) private {
        require(_amount > 0, "RewardRouter: invalid _amount");

        uint256 balance = IRewardTracker(stakedBmxTracker).stakedAmounts(_account);

        IRewardTracker(feeBmxTracker).unstakeForAccount(_account, bonusBmxTracker, _amount, _account);
        IRewardTracker(bonusBmxTracker).unstakeForAccount(_account, stakedBmxTracker, _amount, _account);
        IRewardTracker(stakedBmxTracker).unstakeForAccount(_account, _token, _amount, _account);

        if (_shouldReduceBnBmx) {
            uint256 bnBmxAmount = IRewardTracker(bonusBmxTracker).claimForAccount(_account, _account);
            if (bnBmxAmount > 0) {
                IRewardTracker(feeBmxTracker).stakeForAccount(_account, _account, bnBmx, bnBmxAmount);
            }

            uint256 stakedBnBmx = IRewardTracker(feeBmxTracker).depositBalances(_account, bnBmx);
            if (stakedBnBmx > 0) {
                uint256 reductionAmount = stakedBnBmx.mul(_amount).div(balance);
                IRewardTracker(feeBmxTracker).unstakeForAccount(_account, bnBmx, reductionAmount, _account);
                IMintable(bnBmx).burn(_account, reductionAmount);
            }
        }

        emit UnstakeGmx(_account, _token, _amount);
    }
}

{
  "compilationTarget": {
    "RewardRouterV4.sol": "RewardRouterV4"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "remappings": []
}