import { ethers, providers } from "ethers";
import { SmartWalletConfig, SmartWalletType } from "../../types";

// ERC-4337 Account Abstraction support
// This is a placeholder implementation - full implementation would require
// bundler service integration and UserOperation creation

export interface ERC4337Config {
  entryPoint: string;
  factory: string;
  bundlerUrl: string;
}

const ERC4337_CONFIGS: Record<number, ERC4337Config> = {
  1: {
    entryPoint: "0x0576a174D229E3cFA37253523E645A78A0C91B57",
    factory: "0x9406Cc6185a346906296840746125a0E44976454",
    bundlerUrl: "https://bundler.eth-infinitism.com/rpc",
  },
  5: {
    entryPoint: "0x0576a174D229E3cFA37253523E645A78A0C91B57",
    factory: "0x9406Cc6185a346906296840746125a0E44976454",
    bundlerUrl: "https://bundler-goerli.eth-infinitism.com/rpc",
  },
};

export async function connectToERC4337(
  accountAddress: string,
  networkId: number,
  provider: providers.Provider
): Promise<SmartWalletConfig | null> {
  try {
    // In full implementation, this would:
    // 1. Verify the account is an ERC-4337 account
    // 2. Fetch owners/signers from the account
    // 3. Get threshold configuration

    // For now, return a placeholder config
    return {
      id: `erc4337_${accountAddress}_${networkId}`,
      type: SmartWalletType.ERC4337,
      address: accountAddress,
      networkId,
      owners: [accountAddress], // Placeholder
      threshold: 1, // Placeholder
      createdAt: Date.now(),
      updatedAt: Date.now(),
    };
  } catch (error) {
    console.error("Failed to connect to ERC-4337 account", error);
    return null;
  }
}

export async function createUserOperation(
  to: string,
  value: string,
  data: string,
  accountAddress: string,
  networkId: number
): Promise<any> {
  const config = ERC4337_CONFIGS[networkId];
  if (!config) {
    throw new Error(`ERC-4337 not supported on network ${networkId}`);
  }

  // Placeholder UserOperation structure
  // Full implementation would:
  // 1. Get nonce from account
  // 2. Calculate callData
  // 3. Estimate gas
  // 4. Sign with account owner
  return {
    sender: accountAddress,
    nonce: "0x0",
    initCode: "0x",
    callData: data || "0x",
    callGasLimit: "0x0",
    verificationGasLimit: "0x0",
    preVerificationGas: "0x0",
    maxFeePerGas: "0x0",
    maxPriorityFeePerGas: "0x0",
    paymasterAndData: "0x",
    signature: "0x",
  };
}

export async function sendUserOperation(
  userOp: any,
  bundlerUrl: string
): Promise<string> {
  // Placeholder - full implementation would send to bundler
  const response = await fetch(bundlerUrl, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      id: 1,
      method: "eth_sendUserOperation",
      params: [userOp, "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"], // EntryPoint
    }),
  });

  const result = await response.json();
  if (result.error) {
    throw new Error(result.error.message);
  }

  return result.result;
}