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// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.5;

import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";

contract BalanceHelper {
    struct TokenBalance {
        uint256 total;
        uint256 allowance;
    }

    function balancesOf(address _user, IERC20[] memory _tokens, address _tokenSpender) public view returns (uint256 ethBalance, TokenBalance[] memory tokensBalances) {
        // Eth balance
        ethBalance = _user.balance;

        // Tokens balance
        tokensBalances = new TokenBalance[](_tokens.length);
        for (uint256 i = 0; i < _tokens.length; i++) {
            tokensBalances[i] = TokenBalance(
                _tokens[i].balanceOf(_user),
                _tokens[i].allowance(_user, _tokenSpender)
            );
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"contract IERC20[]","name":"_tokens","type":"address[]"},{"internalType":"address","name":"_tokenSpender","type":"address"}],"name":"balancesOf","outputs":[{"internalType":"uint256","name":"ethBalance","type":"uint256"},{"components":[{"internalType":"uint256","name":"total","type":"uint256"},{"internalType":"uint256","name":"allowance","type":"uint256"}],"internalType":"struct BalanceHelper.TokenBalance[]","name":"tokensBalances","type":"tuple[]"}],"stateMutability":"view","type":"function"}]

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