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// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

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

import "./interfaces/IAggregatorExecutor.sol";

contract AggregatorGuard {

    address constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    event AggregatedTrade(
        uint16 indexed id,
        address indexed user,
        address tokenIn,
        address tokenOut,
        address executor,
        uint256 amountIn,
        uint256 amountOut,
        uint256 minAmountOut
    );

    receive() external payable { }
    fallback() external payable { } // optional, add for remix to allow low level interactions

    function IceCreamSwap() external payable returns (uint256) {
        uint16 id;
        IAggregatorExecutor executor;
        uint128 amountIn;
        uint128 minAmountOut;

        address firstTokenReceiver;
        address recipient;
        IERC20 tokenIn;
        IERC20 tokenOut;

        assembly {
            id := shr(240, calldataload(4))
            executor := shr(96, calldataload(6))
            amountIn := shr(128, calldataload(26))
            minAmountOut := shr(128, calldataload(42))
            firstTokenReceiver := shr(96, calldataload(59))
            recipient := shr(96, calldataload(79))
            tokenIn := shr(96, calldataload(99))
            tokenOut := shr(96, calldataload(119))
        }

        if (address(tokenIn) != ETH) {
            // no need to check this token transfer, as a non sucessfull transfer would just cause a failed swap
            if (amountIn != 0) {
                tokenIn.transferFrom(msg.sender, firstTokenReceiver, amountIn);
            }
        } else {
            require(amountIn == msg.value, "incorrect value");
            require(firstTokenReceiver == address(executor), "Native receiver must bee executor");
        }

        uint256 balanceBefore = (address(tokenOut) == ETH) ? recipient.balance : tokenOut.balanceOf(recipient);

        executor.executeSwap{value: msg.value}(msg.data[26:]);

        uint256 amountOut;
        if (address(tokenOut) != ETH) {
            amountOut = tokenOut.balanceOf(recipient) - balanceBefore;
        } else {
            amountOut = recipient.balance - balanceBefore;
        }
        require(amountOut >= minAmountOut, "Insufficient output");

        emit AggregatedTrade(
            id,
            recipient,
            address(tokenIn),
            address(tokenOut),
            address(executor),
            amountIn,
            amountOut,
            minAmountOut
        );

        return amountOut;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

interface IAggregatorExecutor {
    function executeSwap(bytes calldata swapData) external payable;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint16","name":"id","type":"uint16"},{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":false,"internalType":"address","name":"tokenOut","type":"address"},{"indexed":false,"internalType":"address","name":"executor","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOut","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minAmountOut","type":"uint256"}],"name":"AggregatedTrade","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"IceCreamSwap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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