// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

pragma experimental ABIEncoderV2;

/**
 * @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);
}

/**
 * @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;
    }
}

/**
 * @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 in 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value : weiValue}(data);
        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);
            }
        }
    }
}

/**
 * @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");
        }
    }
}

interface IBPool is IERC20 {
    function version() external view returns(uint);
    function swapExactAmountIn(address, uint, address, uint, uint) external returns (uint, uint);

    function swapExactAmountOut(address, uint, address, uint, uint) external returns (uint, uint);

    function calcInGivenOut(uint, uint, uint, uint, uint, uint) external pure returns (uint);

    function calcOutGivenIn(uint, uint, uint, uint, uint, uint) external pure returns (uint);

    function getDenormalizedWeight(address) external view returns (uint);

    function swapFee() external view returns (uint);

    function setSwapFee(uint _swapFee) external;

    function bind(address token, uint balance, uint denorm) external;

    function rebind(address token, uint balance, uint denorm) external;

    function finalize(
        uint _swapFee,
        uint _initPoolSupply,
        address[] calldata _bindTokens,
        uint[] calldata _bindDenorms
    ) external;

    function setPublicSwap(bool _publicSwap) external;
    function setController(address _controller) external;
    function setExchangeProxy(address _exchangeProxy) external;
    function getFinalTokens() external view returns (address[] memory tokens);


    function getTotalDenormalizedWeight() external view returns (uint);

    function getBalance(address token) external view returns (uint);


    function joinPool(uint poolAmountOut, uint[] calldata maxAmountsIn) external;
    function joinPoolFor(address account, uint rewardAmountOut, uint[] calldata maxAmountsIn) external;
    function joinswapPoolAmountOut(address tokenIn, uint poolAmountOut, uint maxAmountIn) external returns (uint tokenAmountIn);

    function exitPool(uint poolAmountIn, uint[] calldata minAmountsOut) external;
    function exitswapPoolAmountIn(address tokenOut, uint poolAmountIn, uint minAmountOut) external returns (uint tokenAmountOut);
    function exitswapExternAmountOut(address tokenOut, uint tokenAmountOut, uint maxPoolAmountIn) external returns (uint poolAmountIn);
    function joinswapExternAmountIn(
        address tokenIn,
        uint tokenAmountIn,
        uint minPoolAmountOut
    ) external returns (uint poolAmountOut);
    function finalizeRewardFundInfo(address _rewardFund, uint _unstakingFrozenTime) external;
    function addRewardPool(IERC20 _rewardToken, uint256 _startBlock, uint256 _endRewardBlock, uint256 _rewardPerBlock,
        uint256 _lockRewardPercent, uint256 _startVestingBlock, uint256 _endVestingBlock) external;
}

interface IFreeFromUpTo {
    function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);
}

interface IBFactory {
    function newBPool() external returns (IBPool);
}

interface IValueLiquidRegistry {
    function getBestPoolsWithLimit(address, address, uint) external view returns (address[] memory);
}

interface IWETH {
    function deposit() external payable;
    function allowance(address owner, address spender) external view returns (uint256);
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
    function balanceOf(address account) external view returns (uint256);
}

// Token pool of arbitrary ERC20 token.
// This is owned and used by a parent FaaSPool.
contract FaaSRewardFund {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    event NewAdmin(address indexed newAdmin);
    event NewPendingAdmin(address indexed newPendingAdmin);
    event NewDelay(uint indexed newDelay);
    event CancelTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);
    event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);
    event QueueTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);

    uint public constant GRACE_PERIOD = 14 days;
    uint public constant MINIMUM_DELAY = 1 days;
    uint public constant MAXIMUM_DELAY = 30 days;
    bool private _initialized;
    address public faasPool;
    address public admin;
    address public pendingAdmin;
    uint public delay;
    bool public admin_initialized;
    mapping(bytes32 => bool) public queuedTransactions;

    constructor() public {
        admin_initialized = false;
        _initialized = false;
    }

    function initialized(address admin_, uint delay_, address _faasPool) public {
        require(_initialized == false, "Timelock::constructor: Delay must exceed minimum delay.");
        require(delay_ >= MINIMUM_DELAY, "Timelock::constructor: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::constructor: Delay must not exceed maximum delay.");
        admin = admin_;
        faasPool = _faasPool;
        delay = delay_;
        _initialized = true;
    }

    // XXX: function() external payable { }
    receive() external payable {}

    function setDelay(uint delay_) public {
        require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock.");
        require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay.");
        delay = delay_;

        emit NewDelay(delay);
    }

    function acceptAdmin() public {
        require(msg.sender == pendingAdmin, "Timelock::acceptAdmin: Call must come from pendingAdmin.");
        admin = msg.sender;
        pendingAdmin = address(0);

        emit NewAdmin(admin);
    }

    function setPendingAdmin(address pendingAdmin_) public {
        // allows one time setting of admin for deployment purposes
        if (admin_initialized) {
            require(msg.sender == address(this), "Timelock::setPendingAdmin: Call must come from Timelock.");
        } else {
            require(msg.sender == admin, "Timelock::setPendingAdmin: First call must come from admin.");
            admin_initialized = true;
        }
        pendingAdmin = pendingAdmin_;

        emit NewPendingAdmin(pendingAdmin);
    }

    function queueTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public returns (bytes32) {
        require(msg.sender == admin, "Timelock::queueTransaction: Call must come from admin.");
        require(eta >= getBlockTimestamp().add(delay), "Timelock::queueTransaction: Estimated execution block must satisfy delay.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = true;

        emit QueueTransaction(txHash, target, value, signature, data, eta);
        return txHash;
    }

    function cancelTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public {
        require(msg.sender == admin, "Timelock::cancelTransaction: Call must come from admin.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = false;

        emit CancelTransaction(txHash, target, value, signature, data, eta);
    }

    function executeTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public payable returns (bytes memory) {
        require(msg.sender == admin, "Timelock::executeTransaction: Call must come from admin.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        require(queuedTransactions[txHash], "Timelock::executeTransaction: Transaction hasn't been queued.");
        require(getBlockTimestamp() >= eta, "Timelock::executeTransaction: Transaction hasn't surpassed time lock.");
        require(getBlockTimestamp() <= eta.add(GRACE_PERIOD), "Timelock::executeTransaction: Transaction is stale.");

        queuedTransactions[txHash] = false;

        bytes memory callData;

        if (bytes(signature).length == 0) {
            callData = data;
        } else {
            callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
        }

        // solium-disable-next-line security/no-call-value
        (bool success, bytes memory returnData) = target.call{value : value}(callData);
        require(success, "Timelock::executeTransaction: Transaction execution reverted.");

        emit ExecuteTransaction(txHash, target, value, signature, data, eta);

        return returnData;
    }

    function getBlockTimestamp() internal view returns (uint) {
        return block.timestamp;
    }


    function balance(IERC20 _token) public view returns (uint256) {
        return _token.balanceOf(address(this));
    }

    function safeTransfer(IERC20 _token, address _to, uint256 _value) external {
        require(msg.sender == faasPool, "!faasPool");
        uint256 _tokenBal = balance(_token);
        _token.safeTransfer(_to, _tokenBal > _value ? _value : _tokenBal);
    }

    /**
     * This function allows governance to take unsupported tokens out of the contract. This is in an effort to make someone whole, should they seriously mess up.
     * There is no guarantee governance will vote to return these. It also allows for removal of airdropped tokens.
     */
    function governanceRecoverUnsupported(IERC20 _token, uint _amount, address _to) external {
        require(msg.sender == address(this), "!timelock");
        if ((address(_token) == address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE))) {
            (bool xfer,) = _to.call{value : _amount}("");
            require(xfer, "ERR_ETH_FAILED");
        } else {
            _token.safeTransfer(_to, _amount);
        }
    }
}

contract FaasPoolProxy {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address;

    IFreeFromUpTo public constant chi = IFreeFromUpTo(0x0000000000004946c0e9F43F4Dee607b0eF1fA1c);

    modifier discountCHI(uint8 flag) {
        if ((flag & 0x1) == 0) {
            _;
        } else {
            uint256 gasStart = gasleft();
            _;
            uint256 gasSpent = 21000 + gasStart - gasleft() + 16 * msg.data.length;
            chi.freeFromUpTo(msg.sender, (gasSpent + 14154) / 41130);
        }
    }

    IWETH weth;
    address private constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
    address public governance;
    address public exchangeProxy;

    constructor(address _weth,address _exchangeProxy) public {
        weth = IWETH(_weth);
        governance = tx.origin;
        exchangeProxy = _exchangeProxy;
    }
    struct PoolRewardInfo {
        IERC20 rewardToken;
        uint256 startBlock;
        uint256 endRewardBlock;
        uint256 rewardPerBlock;
        uint256 lockRewardPercent;
        uint256 startVestingBlock;
        uint256 endVestingBlock;
        uint unstakingFrozenTime;
        uint rewardFundAmount;
    }

    struct PoolInfo {
        IBFactory factory;
        address[] tokens;
        uint[] balances;
        uint[] denorms;
        uint swapFee;
        uint initPoolSupply;
    }

    receive() external payable {}

    function setExchangeProxy(address _exchangeProxy) external {
        require(msg.sender == governance, "!governance");
        exchangeProxy = _exchangeProxy;
    }
    function createInternal(
        PoolInfo calldata poolInfo

    ) internal returns (IBPool pool) {
        address[] memory tokens = poolInfo.tokens;
        require(tokens.length == poolInfo.balances.length, "ERR_LENGTH_MISMATCH");
        require(tokens.length == poolInfo.denorms.length, "ERR_LENGTH_MISMATCH");
        pool = poolInfo.factory.newBPool();
        bool containsETH = false;
        for (uint i = 0; i < tokens.length; i++) {
            if (transferFromAllTo(tokens[i], poolInfo.balances[i], address(pool))) {
                containsETH = true;
                tokens[i] = address(weth);
            }
        }
        require(msg.value == 0 || containsETH, "!invalid payable");
        pool.finalize(poolInfo.swapFee, poolInfo.initPoolSupply, tokens, poolInfo.denorms);

    }

    function createFaaSReward(
        PoolInfo calldata poolInfo,
        PoolRewardInfo calldata poolRewardInfo,
        uint8 flag
    ) payable external discountCHI(flag) returns (IBPool pool) {
        pool = createInternal(poolInfo);
        {
            FaaSRewardFund faasRewardFund = new FaaSRewardFund();
            pool.finalizeRewardFundInfo(address(faasRewardFund), poolRewardInfo.unstakingFrozenTime);
            pool.addRewardPool(
                poolRewardInfo.rewardToken,
                poolRewardInfo.startBlock,
                poolRewardInfo.endRewardBlock,
                poolRewardInfo.rewardPerBlock,
                poolRewardInfo.lockRewardPercent,
                poolRewardInfo.startVestingBlock,
                poolRewardInfo.endVestingBlock);
            transferFromAllTo(address(poolRewardInfo.rewardToken), poolRewardInfo.rewardFundAmount, address(faasRewardFund));
            faasRewardFund.initialized(msg.sender, poolRewardInfo.unstakingFrozenTime + 1 days, address(pool));
            pool.setExchangeProxy(exchangeProxy);
            pool.setController(address(faasRewardFund));
        }
        uint lpAmount = pool.balanceOf(address(this));
        if (lpAmount > 0) {
            IERC20(pool).safeTransfer(msg.sender, lpAmount);
        }
    }

    function isETH(IERC20 token) internal pure returns (bool) {
        return (address(token) == ETH_ADDRESS);
    }

    function transferFromAllTo(address token, uint amount, address to) internal returns (bool containsETH) {
        if (isETH(IERC20(token))) {
            require(amount == msg.value, "!invalid amount");
            weth.deposit{value : amount}();
            weth.transfer(to, amount);
            containsETH = true;
        } else {
            IERC20(token).safeTransferFrom(msg.sender, to, amount);
        }
        return containsETH;
    }

    function transferFromAllAndApprove(address token, uint amount, address spender) internal returns (bool containsETH) {
        if (isETH(IERC20(token))) {
            require(amount == msg.value, "!invalid amount");
            weth.deposit{value : amount}();
            if (weth.allowance(address(this), spender) > 0) {
                IERC20(address(weth)).safeApprove(address(spender), 0);
            }
            IERC20(address(weth)).safeApprove(spender, amount);
            containsETH = true;
        } else {
            IERC20(token).safeTransferFrom(msg.sender, address(this), amount);
            if (IERC20(token).allowance(address(this), spender) > 0) {
                IERC20(token).safeApprove(spender, 0);
            }
            IERC20(token).safeApprove(spender, amount);
        }
        return containsETH;
    }
}