// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract CrossChainToken is ERC20, Ownable {
    
    // Bridge event
    event Bridge(address indexed user, uint256 amount);
    // Mint event
    event Mint(address indexed to, uint256 amount);

    /**
     * @param name Token Name
     * @param symbol Token Symbol
     * @param totalSupply Token Supply
     */
    constructor(
        string memory name,
        string memory symbol,
        uint256 totalSupply
    ) payable ERC20(name, symbol) Ownable(msg.sender) {
        _mint(msg.sender, totalSupply);
    }

    /**
     * Bridge function
     * @param amount: burn amount of token on the current chain and mint on the other chain
     */
    function bridge(uint256 amount) public {
        _burn(msg.sender, amount);
        emit Bridge(msg.sender, amount);
    }

    /**
     * Mint function
     */
    function mint(address to, uint amount) external onlyOwner {
        _mint(to, amount);
        emit  Mint(to, amount);
    }
}

import { ethers } from "ethers";

// 初始化两条链的provider
const providerGoerli = new ethers.JsonRpcProvider("Goerli_Provider_URL");
const providerSepolia = new ethers.JsonRpcProvider("Sepolia_Provider_URL://eth-sepolia.g.alchemy.com/v2/RgxsjQdKTawszh80TpJ-14Y8tY7cx5W2");

// 初始化两条链的signer
// privateKey填管理者钱包的私钥
const privateKey = "Your_Key";
const walletGoerli = new ethers.Wallet(privateKey, providerGoerli);
const walletSepolia = new ethers.Wallet(privateKey, providerSepolia);

// 合约地址和ABI
const contractAddressGoerli = "0xa2950F56e2Ca63bCdbA422c8d8EF9fC19bcF20DD";
const contractAddressSepolia = "0xad20993E1709ed13790b321bbeb0752E50b8Ce69";

const abi = [
    "event Bridge(address indexed user, uint256 amount)",
    "function bridge(uint256 amount) public",
    "function mint(address to, uint amount) external",
];

// 初始化合约实例
const contractGoerli = new ethers.Contract(contractAddressGoerli, abi, walletGoerli);
const contractSepolia = new ethers.Contract(contractAddressSepolia, abi, walletSepolia);

const main = async () => {
    try{
        console.log(`开始监听跨链事件`)

        // 监听chain Sepolia的Bridge事件，然后在Goerli上执行mint操作，完成跨链
        contractSepolia.on("Bridge", async (user, amount) => {
            console.log(`Bridge event on Chain Sepolia: User ${user} burned ${amount} tokens`);

            // 在Goerli上执行mint操作
            let tx = await contractGoerli.mint(user, amount);
            await tx.wait();

            console.log(`Minted ${amount} tokens to ${user} on Chain Goerli`);
        });

        // 监听chain Goerli的Bridge事件，然后在Sepolia上执行mint操作，完成跨链
        contractGoerli.on("Bridge", async (user, amount) => {
            console.log(`Bridge event on Chain Goerli: User ${user} burned ${amount} tokens`);

            // 在Sepolia上执行mint操作
            let tx = await contractSepolia.mint(user, amount);
            await tx.wait();

            console.log(`Minted ${amount} tokens to ${user} on Chain Sepolia`);
        });
    } catch(e) {
        console.log(e);
    } 
}

main();