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// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;

import "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
import "@balancer-labs/v2-interfaces/contracts/pool-utils/IRateProvider.sol";
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol";
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/ITemporarilyPausable.sol";
import "@balancer-labs/v2-interfaces/contracts/pool-utils/IRecoveryMode.sol";

enum TotalSupplyType { TOTAL_SUPPLY, VIRTUAL_SUPPLY, ACTUAL_SUPPLY }
enum SwapFeeType { SWAP_FEE_PERCENTAGE, PERCENT_FEE }

// The base ILinearPool does not include getWrappedTokenRate, so we redefine it here.
interface ILinearPool {
    function getWrappedTokenRate() external view returns (uint256);

    function getTargets() external view returns (uint256 lowerTarget, uint256 upperTarget);
}

interface IWeightedPool {
    function getNormalizedWeights() external view returns (uint256[] memory);
}

interface IPoolWithScalingFactors {
    function getScalingFactors() external view returns (uint256[] memory);
}

interface IPoolWithActualSupply {
    function getActualSupply() external view returns (uint256);
}

interface IPoolWithVirtualSupply {
    function getVirtualSupply() external view returns (uint256);
}

interface IPoolWithSwapFeePercentage {
    function getSwapFeePercentage() external view returns (uint256);
}

interface IPoolWithPercentFee {
    function percentFee() external view returns (uint256);
}

interface IPoolWithAmp {
    function getAmplificationParameter()
        external
        view
        returns (
            uint256 value,
            bool isUpdating,
            uint256 precision
        );
}

struct PoolDataQueryConfig {
    bool loadTokenBalanceUpdatesAfterBlock;
    bool loadTotalSupply;
    bool loadSwapFees;
    bool loadLinearWrappedTokenRates;
    bool loadLinearTargets;
    bool loadNormalizedWeights;
    bool loadScalingFactors;
    bool loadAmps;
    bool loadRates;
    uint256 blockNumber;
    TotalSupplyType[] totalSupplyTypes;
    SwapFeeType[] swapFeeTypes;
    uint256[] linearPoolIdxs;
    uint256[] weightedPoolIdxs;
    uint256[] scalingFactorPoolIdxs;
    uint256[] ampPoolIdxs;
    uint256[] ratePoolIdxs;
}

struct PoolStatusQueryConfig {
    bool loadInRecoveryMode;
    bool loadIsPaused;
}

/**
 * @dev This contract builds on top of the Balancer V2 architecture to provide useful helpers for fetching on chain data
 * for Balancer pools. It is especially helpful for SOR (Smart order router) initialization. It allows for bulking
 * actions for many pools at once, with the overall goal to reduce network-in and network-out required for loading
 * useful onchain data.
 */
contract BalancerPoolDataQueries {
    IVault public immutable vault;

    constructor(IVault _vault) {
        vault = _vault;
    }

    /**
     * @dev Under most circumstances, you will use getPoolData as the main entry point for this contract.
     * It allows you to fetch various types of pool data for many pools in a single query. The response
     * is optimized for data out. We return the minimum amount of data from this query to facilitate
     * faster network requests. getPoolData replaces the generic multicall approach that over fetches data
     * in most situations and will revert if any query in the multicall reverts, making it difficult to identify
     * pools that need to be filtered from routing. This function returns an array ignoreIdxs that contains the
     * enumerated idxs in the poolIds array that should be filtered out.
     */
    function getPoolData(bytes32[] memory poolIds, PoolDataQueryConfig memory config)
        external
        view
        returns (
            uint256[][] memory balances,
            uint256[] memory totalSupplies,
            uint256[] memory swapFees,
            uint256[] memory linearWrappedTokenRates,
            uint256[][] memory linearTargets,
            uint256[][] memory weights,
            uint256[][] memory scalingFactors,
            uint256[] memory amps,
            uint256[] memory rates,
            uint256[] memory ignoreIdxs
        )
    {
        uint256 i;
        address[] memory pools = new address[](poolIds.length);

        for (i = 0; i < poolIds.length; i++) {
            (pools[i], ) = vault.getPool(poolIds[i]);
        }

        if (config.loadTokenBalanceUpdatesAfterBlock) {
            balances = getPoolTokenBalancesWithUpdatesAfterBlock(poolIds, config.blockNumber);
        }

        if (config.loadTotalSupply) {
            totalSupplies = getTotalSupplyForPools(pools, config.totalSupplyTypes);
        }

        if (config.loadSwapFees) {
            swapFees = getSwapFeePercentageForPools(pools, config.swapFeeTypes);
        }

        if (config.loadLinearWrappedTokenRates) {
            address[] memory linearPools = new address[](config.linearPoolIdxs.length);

            for (i = 0; i < config.linearPoolIdxs.length; i++) {
                linearPools[i] = pools[config.linearPoolIdxs[i]];
            }

            linearWrappedTokenRates = getWrappedTokenRateForLinearPools(linearPools);
        }

        if (config.loadNormalizedWeights) {
            address[] memory weightedPools = new address[](config.weightedPoolIdxs.length);

            for (i = 0; i < config.weightedPoolIdxs.length; i++) {
                weightedPools[i] = pools[config.weightedPoolIdxs[i]];
            }

            weights = getNormalizedWeightsForPools(weightedPools);
        }

        if (config.loadScalingFactors) {
            address[] memory scalingFactorPools = new address[](config.scalingFactorPoolIdxs.length);

            for (i = 0; i < config.scalingFactorPoolIdxs.length; i++) {
                scalingFactorPools[i] = pools[config.scalingFactorPoolIdxs[i]];
            }

            scalingFactors = getScalingFactorsForPools(scalingFactorPools);
        }

        if (config.loadAmps) {
            address[] memory ampPools = new address[](config.ampPoolIdxs.length);

            for (i = 0; i < config.ampPoolIdxs.length; i++) {
                ampPools[i] = pools[config.ampPoolIdxs[i]];
            }

            amps = getAmpForPools(ampPools);
        }

        if (config.loadRates) {
            address[] memory ratePools = new address[](config.ratePoolIdxs.length);

            for (i = 0; i < config.ratePoolIdxs.length; i++) {
                ratePools[i] = pools[config.ratePoolIdxs[i]];
            }

            rates = getRateForPools(ratePools);
        }

        if (config.loadLinearTargets) {
            address[] memory linearTargetPools = new address[](config.linearPoolIdxs.length);

            for (i = 0; i < config.linearPoolIdxs.length; i++) {
                linearTargetPools[i] = pools[config.linearPoolIdxs[i]];
            }

            linearTargets = getLinearTargetsForPools(linearTargetPools);
        }

        ignoreIdxs = _getErrorIdxsFromResults(
            poolIds,
            config,
            totalSupplies,
            swapFees,
            linearWrappedTokenRates,
            amps,
            rates,
            scalingFactors,
            weights
        );
    }

    function getPoolStatus(bytes32[] memory poolIds, PoolStatusQueryConfig memory config)
        external
        view
        returns (bool[] memory isPaused, bool[] memory inRecoveryMode)
    {
        uint256 i;
        address[] memory pools = new address[](poolIds.length);

        for (i = 0; i < poolIds.length; i++) {
            (pools[i], ) = vault.getPool(poolIds[i]);
        }

        if (config.loadIsPaused) {
            isPaused = getIsPausedForPools(pools);
        }

        if (config.loadInRecoveryMode) {
            inRecoveryMode = getInRecoveryModeForPools(pools);
        }
    }

    function getPoolTokenBalancesWithUpdatesAfterBlock(bytes32[] memory poolIds, uint256 blockNumber)
        public
        view
        returns (uint256[][] memory)
    {
        uint256[] memory balances;
        uint256 lastChangeBlock;
        uint256[][] memory allBalances = new uint256[][](poolIds.length);

        for (uint256 i = 0; i < poolIds.length; i++) {
            (, balances, lastChangeBlock) = vault.getPoolTokens(poolIds[i]);

            if (lastChangeBlock > blockNumber) {
                allBalances[i] = balances;
            }
        }

        return allBalances;
    }

    function getWrappedTokenRateForLinearPools(address[] memory poolAddresses) public view returns (uint256[] memory) {
        uint256[] memory rates = new uint256[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            rates[i] = _getLinearWrappedTokenRate(poolAddresses[i]);
        }

        return rates;
    }

    function getAmpForPools(address[] memory poolAddresses) public view returns (uint256[] memory) {
        uint256[] memory amps = new uint256[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            amps[i] = _getPoolAmp(poolAddresses[i]);
        }

        return amps;
    }

    function getRateForPools(address[] memory poolAddresses) public view returns (uint256[] memory) {
        uint256[] memory rates = new uint256[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            rates[i] = _getPoolRate(poolAddresses[i]);
        }

        return rates;
    }

    function getSwapFeePercentageForPools(address[] memory poolAddresses, SwapFeeType[] memory swapFeeTypes)
        public
        view
        returns (uint256[] memory)
    {
        uint256[] memory swapFees = new uint256[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            if (swapFeeTypes[i] == SwapFeeType.PERCENT_FEE) {
                try IPoolWithPercentFee(poolAddresses[i]).percentFee() returns (uint256 swapFee) {
                    swapFees[i] = swapFee;
                } catch {
                    swapFees[i] = 0;
                }
            } else {
                // In instances where we get an unknown pool type that does not support the default getSwapFeePercentage
                // we return a 0 swap fee.
                try IPoolWithSwapFeePercentage(poolAddresses[i]).getSwapFeePercentage() returns (uint256 swapFee) {
                    swapFees[i] = swapFee;
                } catch {
                    swapFees[i] = 0;
                }
            }
        }

        return swapFees;
    }

    function getTotalSupplyForPools(address[] memory poolAddresses, TotalSupplyType[] memory totalSupplyTypes)
        public
        view
        returns (uint256[] memory)
    {
        uint256[] memory totalSupplies = new uint256[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            if (totalSupplyTypes[i] == TotalSupplyType.VIRTUAL_SUPPLY) {
                totalSupplies[i] = _getPoolVirtualSupply(poolAddresses[i]);
            } else if (totalSupplyTypes[i] == TotalSupplyType.ACTUAL_SUPPLY) {
                totalSupplies[i] = _getPoolActualSupply(poolAddresses[i]);
            } else {
                totalSupplies[i] = _getPoolTotalSupply(poolAddresses[i]);
            }
        }

        return totalSupplies;
    }

    function getNormalizedWeightsForPools(address[] memory poolAddresses) public view returns (uint256[][] memory) {
        uint256[][] memory allWeights = new uint256[][](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            allWeights[i] = _getPoolNormalizedWeights(poolAddresses[i]);
        }

        return allWeights;
    }

    function getScalingFactorsForPools(address[] memory poolAddresses) public view returns (uint256[][] memory) {
        uint256[][] memory allScalingFactors = new uint256[][](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            allScalingFactors[i] = _getPoolScalingFactors(poolAddresses[i]);
        }

        return allScalingFactors;
    }

    function getLinearTargetsForPools(address[] memory poolAddresses) public view returns (uint256[][] memory) {
        uint256[][] memory linearTargets = new uint256[][](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            linearTargets[i] = _getPoolLinearTargets(poolAddresses[i]);
        }

        return linearTargets;
    }

    function getInRecoveryModeForPools(address[] memory poolAddresses) public view returns (bool[] memory) {
        bool[] memory inRecoveryModes = new bool[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            inRecoveryModes[i] = _getPoolInRecoveryMode(poolAddresses[i]);
        }

        return inRecoveryModes;
    }

    function getIsPausedForPools(address[] memory poolAddresses) public view returns (bool[] memory) {
        bool[] memory isPaused = new bool[](poolAddresses.length);

        for (uint256 i = 0; i < poolAddresses.length; i++) {
            isPaused[i] = _getPoolIsPaused(poolAddresses[i]);
        }

        return isPaused;
    }

    /**
     * @dev Our goal is to prevent queries from reverting even if one or more pools are in an invalid/corrupt state.
     * We wrap each query below in a try/catch block, and return a value of 0 in instances where the query reverts.
     * We use a 0 value as our sentinel value, but recognize it is possible for pools to return a 0 value in non error
     * situations (ie: pool is uninitialized). In such situations, it is still appropriate for us to flag the pool to
     * be ignored.
     */
    function _getLinearWrappedTokenRate(address poolAddress) internal view returns (uint256) {
        try ILinearPool(poolAddress).getWrappedTokenRate() returns (uint256 rate) {
            return rate;
        } catch {
            return 0;
        }
    }

    function _getPoolLinearTargets(address poolAddress) internal view returns (uint256[] memory) {
        uint256[] memory targets = new uint256[](2);

        (targets[0], targets[1]) = ILinearPool(poolAddress).getTargets();

        return targets;
    }

    function _getPoolVirtualSupply(address poolAddress) internal view returns (uint256) {
        try IPoolWithVirtualSupply(poolAddress).getVirtualSupply() returns (uint256 virtualSupply) {
            return virtualSupply;
        } catch {
            return 0;
        }
    }

    function _getPoolActualSupply(address poolAddress) internal view returns (uint256) {
        try IPoolWithActualSupply(poolAddress).getActualSupply() returns (uint256 actualSupply) {
            return actualSupply;
        } catch {
            return 0;
        }
    }

    function _getPoolTotalSupply(address poolAddress) internal view returns (uint256) {
        try IERC20(poolAddress).totalSupply() returns (uint256 totalSupply) {
            return totalSupply;
        } catch {
            return 0;
        }
    }

    function _getPoolRate(address poolAddress) internal view returns (uint256) {
        try IRateProvider(poolAddress).getRate() returns (uint256 rate) {
            return rate;
        } catch {
            return 0;
        }
    }

    function _getPoolScalingFactors(address poolAddress) internal view returns (uint256[] memory) {
        try IPoolWithScalingFactors(poolAddress).getScalingFactors() returns (uint256[] memory scalingFactors) {
            return scalingFactors;
        } catch {
            uint256[] memory empty = new uint256[](0);

            return empty;
        }
    }

    function _getPoolNormalizedWeights(address poolAddress) internal view returns (uint256[] memory) {
        try IWeightedPool(poolAddress).getNormalizedWeights() returns (uint256[] memory normalizedWeights) {
            return normalizedWeights;
        } catch {
            uint256[] memory empty = new uint256[](0);

            return empty;
        }
    }

    function _getPoolAmp(address poolAddress) internal view returns (uint256) {
        try IPoolWithAmp(poolAddress).getAmplificationParameter() returns (uint256 value, bool, uint256) {
            return value;
        } catch {
            return 0;
        }
    }

    function _getPoolInRecoveryMode(address poolAddress) internal view returns (bool) {
        try IRecoveryMode(poolAddress).inRecoveryMode() returns (bool inRecoveryMode) {
            return inRecoveryMode;
        } catch {
            return false;
        }
    }

    function _getPoolIsPaused(address poolAddress) internal view returns (bool) {
        try ITemporarilyPausable(poolAddress).getPausedState() returns (bool paused, uint256, uint256) {
            return paused;
        } catch {
            return false;
        }
    }

    function _getErrorIdxsFromResults(
        bytes32[] memory poolIds,
        PoolDataQueryConfig memory config,
        uint256[] memory totalSupplies,
        uint256[] memory swapFees,
        uint256[] memory linearWrappedTokenRates,
        uint256[] memory amps,
        uint256[] memory rates,
        uint256[][] memory scalingFactors,
        uint256[][] memory weights
    ) internal pure returns (uint256[] memory) {
        bool[] memory errors = new bool[](poolIds.length);
        uint256 numErrors = 0;
        uint256 i;

        for (i = 0; i < poolIds.length; i++) {
            if ((config.loadTotalSupply && totalSupplies[i] == 0) || (config.loadSwapFees && swapFees[i] == 0)) {
                errors[i] = true;
            }
        }

        if (config.loadLinearWrappedTokenRates) {
            for (i = 0; i < config.linearPoolIdxs.length; i++) {
                if (linearWrappedTokenRates[i] == 0) {
                    errors[config.linearPoolIdxs[i]] = true;
                }
            }
        }

        if (config.loadAmps) {
            for (i = 0; i < config.ampPoolIdxs.length; i++) {
                if (amps[i] == 0) {
                    errors[config.ampPoolIdxs[i]] = true;
                }
            }
        }

        if (config.loadRates) {
            for (i = 0; i < config.ratePoolIdxs.length; i++) {
                if (rates[i] == 0) {
                    errors[config.ratePoolIdxs[i]] = true;
                }
            }
        }

        if (config.loadScalingFactors) {
            for (i = 0; i < config.scalingFactorPoolIdxs.length; i++) {
                // any failed fetches to scaling factors returns an empty array
                if (scalingFactors[i].length == 0) {
                    errors[config.scalingFactorPoolIdxs[i]] = true;
                }
            }
        }

        if (config.loadNormalizedWeights) {
            for (i = 0; i < config.weightedPoolIdxs.length; i++) {
                // any failed fetches to normalized weights returns an empty array
                if (weights[i].length == 0) {
                    errors[config.weightedPoolIdxs[i]] = true;
                }
            }
        }

        for (i = 0; i < errors.length; i++) {
            if (errors[i] == true) {
                numErrors++;
            }
        }

        uint256[] memory errorIdxs = new uint256[](numErrors);
        uint256 idx = 0;

        for (i = 0; i < errors.length; i++) {
            if (errors[i] == true) {
                errorIdxs[idx] = i;
                idx++;
            }
        }

        return errorIdxs;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

interface IRateProvider {
    /**
     * @dev Returns an 18 decimal fixed point number that is the exchange rate of the token to some other underlying
     * token. The meaning of this rate depends on the context.
     */
    function getRate() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev Interface for the RecoveryMode module.
 */
interface IRecoveryMode {
    /**
     * @dev Emitted when the Recovery Mode status changes.
     */
    event RecoveryModeStateChanged(bool enabled);

    /**
     * @notice Enables Recovery Mode in the Pool, disabling protocol fee collection and allowing for safe proportional
     * exits with low computational complexity and no dependencies.
     */
    function enableRecoveryMode() external;

    /**
     * @notice Disables Recovery Mode in the Pool, restoring protocol fee collection and disallowing proportional exits.
     */
    function disableRecoveryMode() external;

    /**
     * @notice Returns true if the Pool is in Recovery Mode.
     */
    function inRecoveryMode() external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

interface IAuthentication {
    /**
     * @dev Returns the action identifier associated with the external function described by `selector`.
     */
    function getActionId(bytes4 selector) external view returns (bytes32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev Interface for the SignatureValidator helper, used to support meta-transactions.
 */
interface ISignaturesValidator {
    /**
     * @dev Returns the EIP712 domain separator.
     */
    function getDomainSeparator() external view returns (bytes32);

    /**
     * @dev Returns the next nonce used by an address to sign messages.
     */
    function getNextNonce(address user) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev Interface for the TemporarilyPausable helper.
 */
interface ITemporarilyPausable {
    /**
     * @dev Emitted every time the pause state changes by `_setPaused`.
     */
    event PausedStateChanged(bool paused);

    /**
     * @dev Returns the current paused state.
     */
    function getPausedState()
        external
        view
        returns (
            bool paused,
            uint256 pauseWindowEndTime,
            uint256 bufferPeriodEndTime
        );
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

import "../openzeppelin/IERC20.sol";

/**
 * @dev Interface for WETH9.
 * See https://github.com/gnosis/canonical-weth/blob/0dd1ea3e295eef916d0c6223ec63141137d22d67/contracts/WETH9.sol
 */
interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;

/**
 * @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 `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);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero
 * address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like
 * types.
 *
 * This concept is unrelated to a Pool's Asset Managers.
 */
interface IAsset {
    // solhint-disable-previous-line no-empty-blocks
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

interface IAuthorizer {
    /**
     * @dev Returns true if `account` can perform the action described by `actionId` in the contract `where`.
     */
    function canPerform(
        bytes32 actionId,
        address account,
        address where
    ) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

// Inspired by Aave Protocol's IFlashLoanReceiver.

import "../solidity-utils/openzeppelin/IERC20.sol";

interface IFlashLoanRecipient {
    /**
     * @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.
     *
     * At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this
     * call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the
     * Vault, or else the entire flash loan will revert.
     *
     * `userData` is the same value passed in the `IVault.flashLoan` call.
     */
    function receiveFlashLoan(
        IERC20[] memory tokens,
        uint256[] memory amounts,
        uint256[] memory feeAmounts,
        bytes memory userData
    ) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;

import "../solidity-utils/openzeppelin/IERC20.sol";

import "./IVault.sol";
import "./IAuthorizer.sol";

interface IProtocolFeesCollector {
    event SwapFeePercentageChanged(uint256 newSwapFeePercentage);
    event FlashLoanFeePercentageChanged(uint256 newFlashLoanFeePercentage);

    function withdrawCollectedFees(
        IERC20[] calldata tokens,
        uint256[] calldata amounts,
        address recipient
    ) external;

    function setSwapFeePercentage(uint256 newSwapFeePercentage) external;

    function setFlashLoanFeePercentage(uint256 newFlashLoanFeePercentage) external;

    function getSwapFeePercentage() external view returns (uint256);

    function getFlashLoanFeePercentage() external view returns (uint256);

    function getCollectedFeeAmounts(IERC20[] memory tokens) external view returns (uint256[] memory feeAmounts);

    function getAuthorizer() external view returns (IAuthorizer);

    function vault() external view returns (IVault);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma experimental ABIEncoderV2;

import "../solidity-utils/openzeppelin/IERC20.sol";
import "../solidity-utils/helpers/IAuthentication.sol";
import "../solidity-utils/helpers/ISignaturesValidator.sol";
import "../solidity-utils/helpers/ITemporarilyPausable.sol";
import "../solidity-utils/misc/IWETH.sol";

import "./IAsset.sol";
import "./IAuthorizer.sol";
import "./IFlashLoanRecipient.sol";
import "./IProtocolFeesCollector.sol";

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev Full external interface for the Vault core contract - no external or public methods exist in the contract that
 * don't override one of these declarations.
 */
interface IVault is ISignaturesValidator, ITemporarilyPausable, IAuthentication {
    // Generalities about the Vault:
    //
    // - Whenever documentation refers to 'tokens', it strictly refers to ERC20-compliant token contracts. Tokens are
    // transferred out of the Vault by calling the `IERC20.transfer` function, and transferred in by calling
    // `IERC20.transferFrom`. In these cases, the sender must have previously allowed the Vault to use their tokens by
    // calling `IERC20.approve`. The only deviation from the ERC20 standard that is supported is functions not returning
    // a boolean value: in these scenarios, a non-reverting call is assumed to be successful.
    //
    // - All non-view functions in the Vault are non-reentrant: calling them while another one is mid-execution (e.g.
    // while execution control is transferred to a token contract during a swap) will result in a revert. View
    // functions can be called in a re-reentrant way, but doing so might cause them to return inconsistent results.
    // Contracts calling view functions in the Vault must make sure the Vault has not already been entered.
    //
    // - View functions revert if referring to either unregistered Pools, or unregistered tokens for registered Pools.

    // Authorizer
    //
    // Some system actions are permissioned, like setting and collecting protocol fees. This permissioning system exists
    // outside of the Vault in the Authorizer contract: the Vault simply calls the Authorizer to check if the caller
    // can perform a given action.

    /**
     * @dev Returns the Vault's Authorizer.
     */
    function getAuthorizer() external view returns (IAuthorizer);

    /**
     * @dev Sets a new Authorizer for the Vault. The caller must be allowed by the current Authorizer to do this.
     *
     * Emits an `AuthorizerChanged` event.
     */
    function setAuthorizer(IAuthorizer newAuthorizer) external;

    /**
     * @dev Emitted when a new authorizer is set by `setAuthorizer`.
     */
    event AuthorizerChanged(IAuthorizer indexed newAuthorizer);

    // Relayers
    //
    // Additionally, it is possible for an account to perform certain actions on behalf of another one, using their
    // Vault ERC20 allowance and Internal Balance. These accounts are said to be 'relayers' for these Vault functions,
    // and are expected to be smart contracts with sound authentication mechanisms. For an account to be able to wield
    // this power, two things must occur:
    //  - The Authorizer must grant the account the permission to be a relayer for the relevant Vault function. This
    //    means that Balancer governance must approve each individual contract to act as a relayer for the intended
    //    functions.
    //  - Each user must approve the relayer to act on their behalf.
    // This double protection means users cannot be tricked into approving malicious relayers (because they will not
    // have been allowed by the Authorizer via governance), nor can malicious relayers approved by a compromised
    // Authorizer or governance drain user funds, since they would also need to be approved by each individual user.

    /**
     * @dev Returns true if `user` has approved `relayer` to act as a relayer for them.
     */
    function hasApprovedRelayer(address user, address relayer) external view returns (bool);

    /**
     * @dev Allows `relayer` to act as a relayer for `sender` if `approved` is true, and disallows it otherwise.
     *
     * Emits a `RelayerApprovalChanged` event.
     */
    function setRelayerApproval(
        address sender,
        address relayer,
        bool approved
    ) external;

    /**
     * @dev Emitted every time a relayer is approved or disapproved by `setRelayerApproval`.
     */
    event RelayerApprovalChanged(address indexed relayer, address indexed sender, bool approved);

    // Internal Balance
    //
    // Users can deposit tokens into the Vault, where they are allocated to their Internal Balance, and later
    // transferred or withdrawn. It can also be used as a source of tokens when joining Pools, as a destination
    // when exiting them, and as either when performing swaps. This usage of Internal Balance results in greatly reduced
    // gas costs when compared to relying on plain ERC20 transfers, leading to large savings for frequent users.
    //
    // Internal Balance management features batching, which means a single contract call can be used to perform multiple
    // operations of different kinds, with different senders and recipients, at once.

    /**
     * @dev Returns `user`'s Internal Balance for a set of tokens.
     */
    function getInternalBalance(address user, IERC20[] memory tokens) external view returns (uint256[] memory);

    /**
     * @dev Performs a set of user balance operations, which involve Internal Balance (deposit, withdraw or transfer)
     * and plain ERC20 transfers using the Vault's allowance. This last feature is particularly useful for relayers, as
     * it lets integrators reuse a user's Vault allowance.
     *
     * For each operation, if the caller is not `sender`, it must be an authorized relayer for them.
     */
    function manageUserBalance(UserBalanceOp[] memory ops) external payable;

    /**
     * @dev Data for `manageUserBalance` operations, which include the possibility for ETH to be sent and received
     without manual WETH wrapping or unwrapping.
     */
    struct UserBalanceOp {
        UserBalanceOpKind kind;
        IAsset asset;
        uint256 amount;
        address sender;
        address payable recipient;
    }

    // There are four possible operations in `manageUserBalance`:
    //
    // - DEPOSIT_INTERNAL
    // Increases the Internal Balance of the `recipient` account by transferring tokens from the corresponding
    // `sender`. The sender must have allowed the Vault to use their tokens via `IERC20.approve()`.
    //
    // ETH can be used by passing the ETH sentinel value as the asset and forwarding ETH in the call: it will be wrapped
    // and deposited as WETH. Any ETH amount remaining will be sent back to the caller (not the sender, which is
    // relevant for relayers).
    //
    // Emits an `InternalBalanceChanged` event.
    //
    //
    // - WITHDRAW_INTERNAL
    // Decreases the Internal Balance of the `sender` account by transferring tokens to the `recipient`.
    //
    // ETH can be used by passing the ETH sentinel value as the asset. This will deduct WETH instead, unwrap it and send
    // it to the recipient as ETH.
    //
    // Emits an `InternalBalanceChanged` event.
    //
    //
    // - TRANSFER_INTERNAL
    // Transfers tokens from the Internal Balance of the `sender` account to the Internal Balance of `recipient`.
    //
    // Reverts if the ETH sentinel value is passed.
    //
    // Emits an `InternalBalanceChanged` event.
    //
    //
    // - TRANSFER_EXTERNAL
    // Transfers tokens from `sender` to `recipient`, using the Vault's ERC20 allowance. This is typically used by
    // relayers, as it lets them reuse a user's Vault allowance.
    //
    // Reverts if the ETH sentinel value is passed.
    //
    // Emits an `ExternalBalanceTransfer` event.

    enum UserBalanceOpKind { DEPOSIT_INTERNAL, WITHDRAW_INTERNAL, TRANSFER_INTERNAL, TRANSFER_EXTERNAL }

    /**
     * @dev Emitted when a user's Internal Balance changes, either from calls to `manageUserBalance`, or through
     * interacting with Pools using Internal Balance.
     *
     * Because Internal Balance works exclusively with ERC20 tokens, ETH deposits and withdrawals will use the WETH
     * address.
     */
    event InternalBalanceChanged(address indexed user, IERC20 indexed token, int256 delta);

    /**
     * @dev Emitted when a user's Vault ERC20 allowance is used by the Vault to transfer tokens to an external account.
     */
    event ExternalBalanceTransfer(IERC20 indexed token, address indexed sender, address recipient, uint256 amount);

    // Pools
    //
    // There are three specialization settings for Pools, which allow for cheaper swaps at the cost of reduced
    // functionality:
    //
    //  - General: no specialization, suited for all Pools. IGeneralPool is used for swap request callbacks, passing the
    // balance of all tokens in the Pool. These Pools have the largest swap costs (because of the extra storage reads),
    // which increase with the number of registered tokens.
    //
    //  - Minimal Swap Info: IMinimalSwapInfoPool is used instead of IGeneralPool, which saves gas by only passing the
    // balance of the two tokens involved in the swap. This is suitable for some pricing algorithms, like the weighted
    // constant product one popularized by Balancer V1. Swap costs are smaller compared to general Pools, and are
    // independent of the number of registered tokens.
    //
    //  - Two Token: only allows two tokens to be registered. This achieves the lowest possible swap gas cost. Like
    // minimal swap info Pools, these are called via IMinimalSwapInfoPool.

    enum PoolSpecialization { GENERAL, MINIMAL_SWAP_INFO, TWO_TOKEN }

    /**
     * @dev Registers the caller account as a Pool with a given specialization setting. Returns the Pool's ID, which
     * is used in all Pool-related functions. Pools cannot be deregistered, nor can the Pool's specialization be
     * changed.
     *
     * The caller is expected to be a smart contract that implements either `IGeneralPool` or `IMinimalSwapInfoPool`,
     * depending on the chosen specialization setting. This contract is known as the Pool's contract.
     *
     * Note that the same contract may register itself as multiple Pools with unique Pool IDs, or in other words,
     * multiple Pools may share the same contract.
     *
     * Emits a `PoolRegistered` event.
     */
    function registerPool(PoolSpecialization specialization) external returns (bytes32);

    /**
     * @dev Emitted when a Pool is registered by calling `registerPool`.
     */
    event PoolRegistered(bytes32 indexed poolId, address indexed poolAddress, PoolSpecialization specialization);

    /**
     * @dev Returns a Pool's contract address and specialization setting.
     */
    function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);

    /**
     * @dev Registers `tokens` for the `poolId` Pool. Must be called by the Pool's contract.
     *
     * Pools can only interact with tokens they have registered. Users join a Pool by transferring registered tokens,
     * exit by receiving registered tokens, and can only swap registered tokens.
     *
     * Each token can only be registered once. For Pools with the Two Token specialization, `tokens` must have a length
     * of two, that is, both tokens must be registered in the same `registerTokens` call, and they must be sorted in
     * ascending order.
     *
     * The `tokens` and `assetManagers` arrays must have the same length, and each entry in these indicates the Asset
     * Manager for the corresponding token. Asset Managers can manage a Pool's tokens via `managePoolBalance`,
     * depositing and withdrawing them directly, and can even set their balance to arbitrary amounts. They are therefore
     * expected to be highly secured smart contracts with sound design principles, and the decision to register an
     * Asset Manager should not be made lightly.
     *
     * Pools can choose not to assign an Asset Manager to a given token by passing in the zero address. Once an Asset
     * Manager is set, it cannot be changed except by deregistering the associated token and registering again with a
     * different Asset Manager.
     *
     * Emits a `TokensRegistered` event.
     */
    function registerTokens(
        bytes32 poolId,
        IERC20[] memory tokens,
        address[] memory assetManagers
    ) external;

    /**
     * @dev Emitted when a Pool registers tokens by calling `registerTokens`.
     */
    event TokensRegistered(bytes32 indexed poolId, IERC20[] tokens, address[] assetManagers);

    /**
     * @dev Deregisters `tokens` for the `poolId` Pool. Must be called by the Pool's contract.
     *
     * Only registered tokens (via `registerTokens`) can be deregistered. Additionally, they must have zero total
     * balance. For Pools with the Two Token specialization, `tokens` must have a length of two, that is, both tokens
     * must be deregistered in the same `deregisterTokens` call.
     *
     * A deregistered token can be re-registered later on, possibly with a different Asset Manager.
     *
     * Emits a `TokensDeregistered` event.
     */
    function deregisterTokens(bytes32 poolId, IERC20[] memory tokens) external;

    /**
     * @dev Emitted when a Pool deregisters tokens by calling `deregisterTokens`.
     */
    event TokensDeregistered(bytes32 indexed poolId, IERC20[] tokens);

    /**
     * @dev Returns detailed information for a Pool's registered token.
     *
     * `cash` is the number of tokens the Vault currently holds for the Pool. `managed` is the number of tokens
     * withdrawn and held outside the Vault by the Pool's token Asset Manager. The Pool's total balance for `token`
     * equals the sum of `cash` and `managed`.
     *
     * Internally, `cash` and `managed` are stored using 112 bits. No action can ever cause a Pool's token `cash`,
     * `managed` or `total` balance to be greater than 2^112 - 1.
     *
     * `lastChangeBlock` is the number of the block in which `token`'s total balance was last modified (via either a
     * join, exit, swap, or Asset Manager update). This value is useful to avoid so-called 'sandwich attacks', for
     * example when developing price oracles. A change of zero (e.g. caused by a swap with amount zero) is considered a
     * change for this purpose, and will update `lastChangeBlock`.
     *
     * `assetManager` is the Pool's token Asset Manager.
     */
    function getPoolTokenInfo(bytes32 poolId, IERC20 token)
        external
        view
        returns (
            uint256 cash,
            uint256 managed,
            uint256 lastChangeBlock,
            address assetManager
        );

    /**
     * @dev Returns a Pool's registered tokens, the total balance for each, and the latest block when *any* of
     * the tokens' `balances` changed.
     *
     * The order of the `tokens` array is the same order that will be used in `joinPool`, `exitPool`, as well as in all
     * Pool hooks (where applicable). Calls to `registerTokens` and `deregisterTokens` may change this order.
     *
     * If a Pool only registers tokens once, and these are sorted in ascending order, they will be stored in the same
     * order as passed to `registerTokens`.
     *
     * Total balances include both tokens held by the Vault and those withdrawn by the Pool's Asset Managers. These are
     * the amounts used by joins, exits and swaps. For a detailed breakdown of token balances, use `getPoolTokenInfo`
     * instead.
     */
    function getPoolTokens(bytes32 poolId)
        external
        view
        returns (
            IERC20[] memory tokens,
            uint256[] memory balances,
            uint256 lastChangeBlock
        );

    /**
     * @dev Called by users to join a Pool, which transfers tokens from `sender` into the Pool's balance. This will
     * trigger custom Pool behavior, which will typically grant something in return to `recipient` - often tokenized
     * Pool shares.
     *
     * If the caller is not `sender`, it must be an authorized relayer for them.
     *
     * The `assets` and `maxAmountsIn` arrays must have the same length, and each entry indicates the maximum amount
     * to send for each asset. The amounts to send are decided by the Pool and not the Vault: it just enforces
     * these maximums.
     *
     * If joining a Pool that holds WETH, it is possible to send ETH directly: the Vault will do the wrapping. To enable
     * this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead of the
     * WETH address. Note that it is not possible to combine ETH and WETH in the same join. Any excess ETH will be sent
     * back to the caller (not the sender, which is important for relayers).
     *
     * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when
     * interacting with Pools that register and deregister tokens frequently. If sending ETH however, the array must be
     * sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the final
     * `assets` array might not be sorted. Pools with no registered tokens cannot be joined.
     *
     * If `fromInternalBalance` is true, the caller's Internal Balance will be preferred: ERC20 transfers will only
     * be made for the difference between the requested amount and Internal Balance (if any). Note that ETH cannot be
     * withdrawn from Internal Balance: attempting to do so will trigger a revert.
     *
     * This causes the Vault to call the `IBasePool.onJoinPool` hook on the Pool's contract, where Pools implement
     * their own custom logic. This typically requires additional information from the user (such as the expected number
     * of Pool shares). This can be encoded in the `userData` argument, which is ignored by the Vault and passed
     * directly to the Pool's contract, as is `recipient`.
     *
     * Emits a `PoolBalanceChanged` event.
     */
    function joinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        JoinPoolRequest memory request
    ) external payable;

    struct JoinPoolRequest {
        IAsset[] assets;
        uint256[] maxAmountsIn;
        bytes userData;
        bool fromInternalBalance;
    }

    /**
     * @dev Called by users to exit a Pool, which transfers tokens from the Pool's balance to `recipient`. This will
     * trigger custom Pool behavior, which will typically ask for something in return from `sender` - often tokenized
     * Pool shares. The amount of tokens that can be withdrawn is limited by the Pool's `cash` balance (see
     * `getPoolTokenInfo`).
     *
     * If the caller is not `sender`, it must be an authorized relayer for them.
     *
     * The `tokens` and `minAmountsOut` arrays must have the same length, and each entry in these indicates the minimum
     * token amount to receive for each token contract. The amounts to send are decided by the Pool and not the Vault:
     * it just enforces these minimums.
     *
     * If exiting a Pool that holds WETH, it is possible to receive ETH directly: the Vault will do the unwrapping. To
     * enable this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead
     * of the WETH address. Note that it is not possible to combine ETH and WETH in the same exit.
     *
     * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when
     * interacting with Pools that register and deregister tokens frequently. If receiving ETH however, the array must
     * be sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the
     * final `assets` array might not be sorted. Pools with no registered tokens cannot be exited.
     *
     * If `toInternalBalance` is true, the tokens will be deposited to `recipient`'s Internal Balance. Otherwise,
     * an ERC20 transfer will be performed. Note that ETH cannot be deposited to Internal Balance: attempting to
     * do so will trigger a revert.
     *
     * `minAmountsOut` is the minimum amount of tokens the user expects to get out of the Pool, for each token in the
     * `tokens` array. This array must match the Pool's registered tokens.
     *
     * This causes the Vault to call the `IBasePool.onExitPool` hook on the Pool's contract, where Pools implement
     * their own custom logic. This typically requires additional information from the user (such as the expected number
     * of Pool shares to return). This can be encoded in the `userData` argument, which is ignored by the Vault and
     * passed directly to the Pool's contract.
     *
     * Emits a `PoolBalanceChanged` event.
     */
    function exitPool(
        bytes32 poolId,
        address sender,
        address payable recipient,
        ExitPoolRequest memory request
    ) external;

    struct ExitPoolRequest {
        IAsset[] assets;
        uint256[] minAmountsOut;
        bytes userData;
        bool toInternalBalance;
    }

    /**
     * @dev Emitted when a user joins or exits a Pool by calling `joinPool` or `exitPool`, respectively.
     */
    event PoolBalanceChanged(
        bytes32 indexed poolId,
        address indexed liquidityProvider,
        IERC20[] tokens,
        int256[] deltas,
        uint256[] protocolFeeAmounts
    );

    enum PoolBalanceChangeKind { JOIN, EXIT }

    // Swaps
    //
    // Users can swap tokens with Pools by calling the `swap` and `batchSwap` functions. To do this,
    // they need not trust Pool contracts in any way: all security checks are made by the Vault. They must however be
    // aware of the Pools' pricing algorithms in order to estimate the prices Pools will quote.
    //
    // The `swap` function executes a single swap, while `batchSwap` can perform multiple swaps in sequence.
    // In each individual swap, tokens of one kind are sent from the sender to the Pool (this is the 'token in'),
    // and tokens of another kind are sent from the Pool to the recipient in exchange (this is the 'token out').
    // More complex swaps, such as one token in to multiple tokens out can be achieved by batching together
    // individual swaps.
    //
    // There are two swap kinds:
    //  - 'given in' swaps, where the amount of tokens in (sent to the Pool) is known, and the Pool determines (via the
    // `onSwap` hook) the amount of tokens out (to send to the recipient).
    //  - 'given out' swaps, where the amount of tokens out (received from the Pool) is known, and the Pool determines
    // (via the `onSwap` hook) the amount of tokens in (to receive from the sender).
    //
    // Additionally, it is possible to chain swaps using a placeholder input amount, which the Vault replaces with
    // the calculated output of the previous swap. If the previous swap was 'given in', this will be the calculated
    // tokenOut amount. If the previous swap was 'given out', it will use the calculated tokenIn amount. These extended
    // swaps are known as 'multihop' swaps, since they 'hop' through a number of intermediate tokens before arriving at
    // the final intended token.
    //
    // In all cases, tokens are only transferred in and out of the Vault (or withdrawn from and deposited into Internal
    // Balance) after all individual swaps have been completed, and the net token balance change computed. This makes
    // certain swap patterns, such as multihops, or swaps that interact with the same token pair in multiple Pools, cost
    // much less gas than they would otherwise.
    //
    // It also means that under certain conditions it is possible to perform arbitrage by swapping with multiple
    // Pools in a way that results in net token movement out of the Vault (profit), with no tokens being sent in (only
    // updating the Pool's internal accounting).
    //
    // To protect users from front-running or the market changing rapidly, they supply a list of 'limits' for each token
    // involved in the swap, where either the maximum number of tokens to send (by passing a positive value) or the
    // minimum amount of tokens to receive (by passing a negative value) is specified.
    //
    // Additionally, a 'deadline' timestamp can also be provided, forcing the swap to fail if it occurs after
    // this point in time (e.g. if the transaction failed to be included in a block promptly).
    //
    // If interacting with Pools that hold WETH, it is possible to both send and receive ETH directly: the Vault will do
    // the wrapping and unwrapping. To enable this mechanism, the IAsset sentinel value (the zero address) must be
    // passed in the `assets` array instead of the WETH address. Note that it is possible to combine ETH and WETH in the
    // same swap. Any excess ETH will be sent back to the caller (not the sender, which is relevant for relayers).
    //
    // Finally, Internal Balance can be used when either sending or receiving tokens.

    enum SwapKind { GIVEN_IN, GIVEN_OUT }

    /**
     * @dev Performs a swap with a single Pool.
     *
     * If the swap is 'given in' (the number of tokens to send to the Pool is known), it returns the amount of tokens
     * taken from the Pool, which must be greater than or equal to `limit`.
     *
     * If the swap is 'given out' (the number of tokens to take from the Pool is known), it returns the amount of tokens
     * sent to the Pool, which must be less than or equal to `limit`.
     *
     * Internal Balance usage and the recipient are determined by the `funds` struct.
     *
     * Emits a `Swap` event.
     */
    function swap(
        SingleSwap memory singleSwap,
        FundManagement memory funds,
        uint256 limit,
        uint256 deadline
    ) external payable returns (uint256);

    /**
     * @dev Data for a single swap executed by `swap`. `amount` is either `amountIn` or `amountOut` depending on
     * the `kind` value.
     *
     * `assetIn` and `assetOut` are either token addresses, or the IAsset sentinel value for ETH (the zero address).
     * Note that Pools never interact with ETH directly: it will be wrapped to or unwrapped from WETH by the Vault.
     *
     * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be
     * used to extend swap behavior.
     */
    struct SingleSwap {
        bytes32 poolId;
        SwapKind kind;
        IAsset assetIn;
        IAsset assetOut;
        uint256 amount;
        bytes userData;
    }

    /**
     * @dev Performs a series of swaps with one or multiple Pools. In each individual swap, the caller determines either
     * the amount of tokens sent to or received from the Pool, depending on the `kind` value.
     *
     * Returns an array with the net Vault asset balance deltas. Positive amounts represent tokens (or ETH) sent to the
     * Vault, and negative amounts represent tokens (or ETH) sent by the Vault. Each delta corresponds to the asset at
     * the same index in the `assets` array.
     *
     * Swaps are executed sequentially, in the order specified by the `swaps` array. Each array element describes a
     * Pool, the token to be sent to this Pool, the token to receive from it, and an amount that is either `amountIn` or
     * `amountOut` depending on the swap kind.
     *
     * Multihop swaps can be executed by passing an `amount` value of zero for a swap. This will cause the amount in/out
     * of the previous swap to be used as the amount in for the current one. In a 'given in' swap, 'tokenIn' must equal
     * the previous swap's `tokenOut`. For a 'given out' swap, `tokenOut` must equal the previous swap's `tokenIn`.
     *
     * The `assets` array contains the addresses of all assets involved in the swaps. These are either token addresses,
     * or the IAsset sentinel value for ETH (the zero address). Each entry in the `swaps` array specifies tokens in and
     * out by referencing an index in `assets`. Note that Pools never interact with ETH directly: it will be wrapped to
     * or unwrapped from WETH by the Vault.
     *
     * Internal Balance usage, sender, and recipient are determined by the `funds` struct. The `limits` array specifies
     * the minimum or maximum amount of each token the vault is allowed to transfer.
     *
     * `batchSwap` can be used to make a single swap, like `swap` does, but doing so requires more gas than the
     * equivalent `swap` call.
     *
     * Emits `Swap` events.
     */
    function batchSwap(
        SwapKind kind,
        BatchSwapStep[] memory swaps,
        IAsset[] memory assets,
        FundManagement memory funds,
        int256[] memory limits,
        uint256 deadline
    ) external payable returns (int256[] memory);

    /**
     * @dev Data for each individual swap executed by `batchSwap`. The asset in and out fields are indexes into the
     * `assets` array passed to that function, and ETH assets are converted to WETH.
     *
     * If `amount` is zero, the multihop mechanism is used to determine the actual amount based on the amount in/out
     * from the previous swap, depending on the swap kind.
     *
     * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be
     * used to extend swap behavior.
     */
    struct BatchSwapStep {
        bytes32 poolId;
        uint256 assetInIndex;
        uint256 assetOutIndex;
        uint256 amount;
        bytes userData;
    }

    /**
     * @dev Emitted for each individual swap performed by `swap` or `batchSwap`.
     */
    event Swap(
        bytes32 indexed poolId,
        IERC20 indexed tokenIn,
        IERC20 indexed tokenOut,
        uint256 amountIn,
        uint256 amountOut
    );

    /**
     * @dev All tokens in a swap are either sent from the `sender` account to the Vault, or from the Vault to the
     * `recipient` account.
     *
     * If the caller is not `sender`, it must be an authorized relayer for them.
     *
     * If `fromInternalBalance` is true, the `sender`'s Internal Balance will be preferred, performing an ERC20
     * transfer for the difference between the requested amount and the User's Internal Balance (if any). The `sender`
     * must have allowed the Vault to use their tokens via `IERC20.approve()`. This matches the behavior of
     * `joinPool`.
     *
     * If `toInternalBalance` is true, tokens will be deposited to `recipient`'s internal balance instead of
     * transferred. This matches the behavior of `exitPool`.
     *
     * Note that ETH cannot be deposited to or withdrawn from Internal Balance: attempting to do so will trigger a
     * revert.
     */
    struct FundManagement {
        address sender;
        bool fromInternalBalance;
        address payable recipient;
        bool toInternalBalance;
    }

    /**
     * @dev Simulates a call to `batchSwap`, returning an array of Vault asset deltas. Calls to `swap` cannot be
     * simulated directly, but an equivalent `batchSwap` call can and will yield the exact same result.
     *
     * Each element in the array corresponds to the asset at the same index, and indicates the number of tokens (or ETH)
     * the Vault would take from the sender (if positive) or send to the recipient (if negative). The arguments it
     * receives are the same that an equivalent `batchSwap` call would receive.
     *
     * Unlike `batchSwap`, this function performs no checks on the sender or recipient field in the `funds` struct.
     * This makes it suitable to be called by off-chain applications via eth_call without needing to hold tokens,
     * approve them for the Vault, or even know a user's address.
     *
     * Note that this function is not 'view' (due to implementation details): the client code must explicitly execute
     * eth_call instead of eth_sendTransaction.
     */
    function queryBatchSwap(
        SwapKind kind,
        BatchSwapStep[] memory swaps,
        IAsset[] memory assets,
        FundManagement memory funds
    ) external returns (int256[] memory assetDeltas);

    // Flash Loans

    /**
     * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,
     * and then reverting unless the tokens plus a proportional protocol fee have been returned.
     *
     * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount
     * for each token contract. `tokens` must be sorted in ascending order.
     *
     * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the
     * `receiveFlashLoan` call.
     *
     * Emits `FlashLoan` events.
     */
    function flashLoan(
        IFlashLoanRecipient recipient,
        IERC20[] memory tokens,
        uint256[] memory amounts,
        bytes memory userData
    ) external;

    /**
     * @dev Emitted for each individual flash loan performed by `flashLoan`.
     */
    event FlashLoan(IFlashLoanRecipient indexed recipient, IERC20 indexed token, uint256 amount, uint256 feeAmount);

    // Asset Management
    //
    // Each token registered for a Pool can be assigned an Asset Manager, which is able to freely withdraw the Pool's
    // tokens from the Vault, deposit them, or assign arbitrary values to its `managed` balance (see
    // `getPoolTokenInfo`). This makes them extremely powerful and dangerous. Even if an Asset Manager only directly
    // controls one of the tokens in a Pool, a malicious manager could set that token's balance to manipulate the
    // prices of the other tokens, and then drain the Pool with swaps. The risk of using Asset Managers is therefore
    // not constrained to the tokens they are managing, but extends to the entire Pool's holdings.
    //
    // However, a properly designed Asset Manager smart contract can be safely used for the Pool's benefit,
    // for example by lending unused tokens out for interest, or using them to participate in voting protocols.
    //
    // This concept is unrelated to the IAsset interface.

    /**
     * @dev Performs a set of Pool balance operations, which may be either withdrawals, deposits or updates.
     *
     * Pool Balance management features batching, which means a single contract call can be used to perform multiple
     * operations of different kinds, with different Pools and tokens, at once.
     *
     * For each operation, the caller must be registered as the Asset Manager for `token` in `poolId`.
     */
    function managePoolBalance(PoolBalanceOp[] memory ops) external;

    struct PoolBalanceOp {
        PoolBalanceOpKind kind;
        bytes32 poolId;
        IERC20 token;
        uint256 amount;
    }

    /**
     * Withdrawals decrease the Pool's cash, but increase its managed balance, leaving the total balance unchanged.
     *
     * Deposits increase the Pool's cash, but decrease its managed balance, leaving the total balance unchanged.
     *
     * Updates don't affect the Pool's cash balance, but because the managed balance changes, it does alter the total.
     * The external amount can be either increased or decreased by this call (i.e., reporting a gain or a loss).
     */
    enum PoolBalanceOpKind { WITHDRAW, DEPOSIT, UPDATE }

    /**
     * @dev Emitted when a Pool's token Asset Manager alters its balance via `managePoolBalance`.
     */
    event PoolBalanceManaged(
        bytes32 indexed poolId,
        address indexed assetManager,
        IERC20 indexed token,
        int256 cashDelta,
        int256 managedDelta
    );

    // Protocol Fees
    //
    // Some operations cause the Vault to collect tokens in the form of protocol fees, which can then be withdrawn by
    // permissioned accounts.
    //
    // There are two kinds of protocol fees:
    //
    //  - flash loan fees: charged on all flash loans, as a percentage of the amounts lent.
    //
    //  - swap fees: a percentage of the fees charged by Pools when performing swaps. For a number of reasons, including
    // swap gas costs and interface simplicity, protocol swap fees are not charged on each individual swap. Rather,
    // Pools are expected to keep track of how much they have charged in swap fees, and pay any outstanding debts to the
    // Vault when they are joined or exited. This prevents users from joining a Pool with unpaid debt, as well as
    // exiting a Pool in debt without first paying their share.

    /**
     * @dev Returns the current protocol fee module.
     */
    function getProtocolFeesCollector() external view returns (IProtocolFeesCollector);

    /**
     * @dev Safety mechanism to pause most Vault operations in the event of an emergency - typically detection of an
     * error in some part of the system.
     *
     * The Vault can only be paused during an initial time period, after which pausing is forever disabled.
     *
     * While the contract is paused, the following features are disabled:
     * - depositing and transferring internal balance
     * - transferring external balance (using the Vault's allowance)
     * - swaps
     * - joining Pools
     * - Asset Manager interactions
     *
     * Internal Balance can still be withdrawn, and Pools exited.
     */
    function setPaused(bool paused) external;

    /**
     * @dev Returns the Vault's WETH instance.
     */
    function WETH() external view returns (IWETH);
    // solhint-disable-previous-line func-name-mixedcase
}

{
  "optimizer": {
    "enabled": true,
    "runs": 9999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IVault","name":"_vault","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getAmpForPools","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getInRecoveryModeForPools","outputs":[{"internalType":"bool[]","name":"","type":"bool[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getIsPausedForPools","outputs":[{"internalType":"bool[]","name":"","type":"bool[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getLinearTargetsForPools","outputs":[{"internalType":"uint256[][]","name":"","type":"uint256[][]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getNormalizedWeightsForPools","outputs":[{"internalType":"uint256[][]","name":"","type":"uint256[][]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"poolIds","type":"bytes32[]"},{"components":[{"internalType":"bool","name":"loadTokenBalanceUpdatesAfterBlock","type":"bool"},{"internalType":"bool","name":"loadTotalSupply","type":"bool"},{"internalType":"bool","name":"loadSwapFees","type":"bool"},{"internalType":"bool","name":"loadLinearWrappedTokenRates","type":"bool"},{"internalType":"bool","name":"loadLinearTargets","type":"bool"},{"internalType":"bool","name":"loadNormalizedWeights","type":"bool"},{"internalType":"bool","name":"loadScalingFactors","type":"bool"},{"internalType":"bool","name":"loadAmps","type":"bool"},{"internalType":"bool","name":"loadRates","type":"bool"},{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"internalType":"enum TotalSupplyType[]","name":"totalSupplyTypes","type":"uint8[]"},{"internalType":"enum SwapFeeType[]","name":"swapFeeTypes","type":"uint8[]"},{"internalType":"uint256[]","name":"linearPoolIdxs","type":"uint256[]"},{"internalType":"uint256[]","name":"weightedPoolIdxs","type":"uint256[]"},{"internalType":"uint256[]","name":"scalingFactorPoolIdxs","type":"uint256[]"},{"internalType":"uint256[]","name":"ampPoolIdxs","type":"uint256[]"},{"internalType":"uint256[]","name":"ratePoolIdxs","type":"uint256[]"}],"internalType":"struct PoolDataQueryConfig","name":"config","type":"tuple"}],"name":"getPoolData","outputs":[{"internalType":"uint256[][]","name":"balances","type":"uint256[][]"},{"internalType":"uint256[]","name":"totalSupplies","type":"uint256[]"},{"internalType":"uint256[]","name":"swapFees","type":"uint256[]"},{"internalType":"uint256[]","name":"linearWrappedTokenRates","type":"uint256[]"},{"internalType":"uint256[][]","name":"linearTargets","type":"uint256[][]"},{"internalType":"uint256[][]","name":"weights","type":"uint256[][]"},{"internalType":"uint256[][]","name":"scalingFactors","type":"uint256[][]"},{"internalType":"uint256[]","name":"amps","type":"uint256[]"},{"internalType":"uint256[]","name":"rates","type":"uint256[]"},{"internalType":"uint256[]","name":"ignoreIdxs","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"poolIds","type":"bytes32[]"},{"components":[{"internalType":"bool","name":"loadInRecoveryMode","type":"bool"},{"internalType":"bool","name":"loadIsPaused","type":"bool"}],"internalType":"struct PoolStatusQueryConfig","name":"config","type":"tuple"}],"name":"getPoolStatus","outputs":[{"internalType":"bool[]","name":"isPaused","type":"bool[]"},{"internalType":"bool[]","name":"inRecoveryMode","type":"bool[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"poolIds","type":"bytes32[]"},{"internalType":"uint256","name":"blockNumber","type":"uint256"}],"name":"getPoolTokenBalancesWithUpdatesAfterBlock","outputs":[{"internalType":"uint256[][]","name":"","type":"uint256[][]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getRateForPools","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getScalingFactorsForPools","outputs":[{"internalType":"uint256[][]","name":"","type":"uint256[][]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"},{"internalType":"enum SwapFeeType[]","name":"swapFeeTypes","type":"uint8[]"}],"name":"getSwapFeePercentageForPools","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"},{"internalType":"enum TotalSupplyType[]","name":"totalSupplyTypes","type":"uint8[]"}],"name":"getTotalSupplyForPools","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"poolAddresses","type":"address[]"}],"name":"getWrappedTokenRateForLinearPools","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vault","outputs":[{"internalType":"contract IVault","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000ba12222222228d8ba445958a75a0704d566bf2c8

-----Decoded View---------------
Arg [0] : _vault (address): 0xBA12222222228d8Ba445958a75a0704d566BF2C8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000ba12222222228d8ba445958a75a0704d566bf2c8