/**
 * 多链配置管理（TypeScript 骨架）
 */
interface ChainConfig {
  id: number;
  name: string;
  rpcUrl: string;
  currency: { name: string; symbol: string; decimals: number };
  explorer: string;
  contracts: { [name: string]: string }; // 已部署合约地址映射
  isTestnet: boolean;
}

const chains: Record<string, ChainConfig> = {
  mainnet: {
    id: 1,
    name: "Ethereum",
    rpcUrl: "https://eth-mainnet.g.alchemy.com/v2/...",
    currency: { name: "Ether", symbol: "ETH", decimals: 18 },
    explorer: "https://etherscan.io",
    contracts: {
      token: "0x6B1754...", // DAI on mainnet
      aavePool: "0x87870B...",
    },
    isTestnet: false,
  },
  arbitrum: {
    id: 42161,
    name: "Arbitrum One",
    rpcUrl: "https://arb-mainnet.g.alchemy.com/v2/...",
    currency: { name: "Ether", symbol: "ETH", decimals: 18 },
    explorer: "https://arbiscan.io",
    contracts: {
      token: "0xDA1000...", // DAI on Arbitrum
      aavePool: "0x794a61...",
    },
    isTestnet: false,
  },
  base: {
    id: 8453,
    name: "Base",
    rpcUrl: "https://base-mainnet.g.alchemy.com/v2/...",
    currency: { name: "Ether", symbol: "ETH", decimals: 18 },
    explorer: "https://basescan.org",
    contracts: {
      token: "0x50c572...", // DAI on Base
    },
    isTestnet: false,
  },
  sepolia: {
    id: 11155111,
    name: "Sepolia",
    rpcUrl: "https://eth-sepolia.g.alchemy.com/v2/...",
    currency: { name: "SepoliaETH", symbol: "ETH", decimals: 18 },
    explorer: "https://sepolia.etherscan.io",
    contracts: {
      token: "0x123abc...",
    },
    isTestnet: true,
  },
};

// 切换链
async function switchChain(targetChainId: number, wallet: any) {
  try {
    await wallet.request({
      method: "wallet_switchEthereumChain",
      params: [{ chainId: "0x" + targetChainId.toString(16) }], // 0x1, 0xa4b1 (42161)
    });
  } catch (error: any) {
    // 如果链未安装，需要先添加
    if (error.code === 4902) {
      const chain = Object.values(chains).find(c => c.id === targetChainId);
      await wallet.request({
        method: "wallet_addEthereumChain",
        params: [{
          chainId: "0x" + targetChainId.toString(16),
          chainName: chain?.name,
          rpcUrls: [chain?.rpcUrl],
          nativeCurrency: chain?.currency,
          blockExplorerUrls: [chain?.explorer],
        }],
      });
    }
  }
}

console.log("多链配置已定义");

/**
 * 跨链交易状态追踪
 */
interface CrossChainTx {
  id: string;
  sourceChain: number;    // 源链 ID
  targetChain: number;    // 目标链 ID
  status: "sending" | "waiting_attestation" | "delivered" | "completed" | "failed";
  sourceTxHash: string;   // 源链交易哈希
  targetTxHash?: string;  // 目标链执行哈希（有延迟）
  estimatedTime: number;  // 秒
  progress: number;       // 0-100%
}

class CrossChainTracker {
  private txs: Map<string, CrossChainTx> = new Map();
  private listeners = new Set<(tx: CrossChainTx) => void>();
  
  // 用户发起桥接
  async initiateBridge(from: number, to: number, amount: bigint, token: string): Promise<string> {
    const txId = crypto.randomUUID(); // 简化 ID
    
    this.txs.set(txId, {
      id: txId,
      sourceChain: from,
      targetChain: to,
      status: "sending",
      sourceTxHash: "",
      estimatedTime: 120, // 2 分钟估计
      progress: 0,
    });
    
    // 简化流程模拟
    setTimeout(() => this.updateStatus(txId, "waiting_attestation", 10), 2000);
    setTimeout(() => this.updateStatus(txId, "delivered", 80), 60000);
    setTimeout(() => this.updateStatus(txId, "completed", 100), 120000);
    
    return txId;
  }
  
  private updateStatus(id: string, status: CrossChainTx["status"], progress: number) {
    const tx = this.txs.get(id);
    if (!tx) return;
    tx.status = status;
    tx.progress = progress;
    for (const cb of this.listeners) cb({ ...tx });
  }
  
  subscribe(txId: string, cb: (tx: CrossChainTx) => void) {
    this.listeners.add(cb);
    return () => this.listeners.delete(cb);
  }
  
  getStatusText(tx: CrossChainTx): string {
    const map: Record<string, string> = {
      sending: "正在发送源链交易...",
      waiting_attestation: "等待目标链验证...",
      delivered: "已到达目标链，确认中...",
      completed: "✅ 完成！",
      failed: "❌ 失败",
    };
    return map[tx.status];
  }
}

// LayerZero SDK 风格的调用层
interface LZSendParam {
  dstEid: number;           // 目标端点 ID (Endpoint ID)
  to: string;               // 目标地址
  amount: bigint;
  minAmount: bigint;        // 防止滑点
  extraOptions: string;     // 额外选项（gas 空投等）
  composeMsg: string;       // 可携带额外消息
  oftCmd: string;           // 命令
}

// 现代跨链桥 SDK 简化高层调用：
// send(srcChain, dstChain, token, amount, recipient)
// 抽象掉 Wormhole VAA / LayerZero 消息包 / 中继器验证 等底层
console.log("跨链架构：锁定-证明-铸造/释放");