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// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// =================== BalancerPoolBalanceChecker =====================
// ====================================================================

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IBalancerPool } from "./interfaces/IBalancerPool.sol";
import { IBalancerVault } from "./interfaces/IBalancerVault.sol";

/**
 * @title BalancerPoolBalanceChecker
 * @author Frax Finance
 * @notice The BalancerPoolBalanceChecker contract is used to retrieve the balances of collateral and LP tokens of pools.
 */
contract BalancerPoolBalanceChecker {
    IBalancerVault private balancerVault = IBalancerVault(0xBA12222222228d8Ba445958a75a0704d566BF2C8);

    constructor() {}

    /**
     * @notice Used to get the structure of a pool.
     * @dev Passing `0x0` address as the token address gets the native token balance.
     * @param poolAddress Address of the pool to check the structure of
     * @param tokens An array of tokens to check the balance of
     * @return result An array of the balances of the tokens in the pool
     * @return totalLpSupply The total supply of the LP token
     */
    function poolStructure(
        address poolAddress,
        address[] memory tokens
    ) external view returns (uint256[] memory result, uint256 totalLpSupply) {
        bytes32 poolId = 0x760b30eb4be3ccd840e91183e33e2953c6a31253000000000000000000000005;
        result = new uint256[](tokens.length);

        for (uint256 i; i < tokens.length; ) {
            (uint256 balance, , , ) = balancerVault.getPoolTokenInfo(poolId, IERC20(tokens[i]));
            result[i] = balance;

            unchecked {
                ++i;
            }
        }

        totalLpSupply = IBalancerPool(poolAddress).getActualSupply();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

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

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IBalancerVault {
    function getPoolTokenInfo(bytes32 poolId, IERC20 token)
        external
        view
        returns (
            uint256 cash,
            uint256 managed,
            uint256 lastChangeBlock,
            address assetManager
        );
}

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}

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