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// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

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

/**
 * @title ZeroDevWithdrawalHelper
 * @notice This contract helps users to manually transfer USDB out of their ZeroDev smart accounts
 * @author predict.fun protocol team
 */
contract ZeroDevWithdrawalHelper {
    address public constant USDB = 0x4300000000000000000000000000000000000003;

    /**
     * @notice Encodes a USDB transfer calldata
     *
     * @param to The address to transfer the USDB to
     * @param amount The amount of USDB to transfer
     *
     * @return userOpCalldata The encoded user operation calldata
     */
    function encodeUSDBTransfer(address to, uint256 amount) external pure returns (bytes memory userOpCalldata) {
        bytes memory callData = abi.encode(to, amount);
        userOpCalldata = abi.encodePacked(USDB, uint256(0), IERC20.transfer.selector, callData);
    }

    /**
     * @notice Encodes an ETH transfer calldata
     *
     * @param to The address to transfer ETH to
     * @param amount The amount of ETH to transfer
     *
     * @return userOpCalldata The encoded user operation calldata
     */
    function encodeETHTransfer(address to, uint256 amount) external pure returns (bytes memory userOpCalldata) {
        userOpCalldata = abi.encodePacked(to, amount, bytes4(0), "");
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 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);
}

{
  "remappings": [
    "@chainlink/=node_modules/@chainlink/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@eth-optimism/=node_modules/@eth-optimism/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "forge-std/=lib/forge-std/src/",
    "hardhat/=node_modules/hardhat/",
    "solmate/=node_modules/solmate/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": true,
  "libraries": {}
}

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[{"inputs":[],"name":"USDB","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"encodeETHTransfer","outputs":[{"internalType":"bytes","name":"userOpCalldata","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"encodeUSDBTransfer","outputs":[{"internalType":"bytes","name":"userOpCalldata","type":"bytes"}],"stateMutability":"pure","type":"function"}]

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