/**
 * 环信 SDK 双用户消息互发测试脚本
 *
 * 同时登录两个环信账号，测试双向消息收发。
 * 配置从项目根目录的 config.json 文件读取。
 *
 * 用法：
 *   node scripts/test-easemob-msg.js              # 默认互发测试
 *   node scripts/test-easemob-msg.js <自定义消息>  # 指定初始消息内容
 */

const path = require('path');
const fs = require('fs');

// ──────────────────────────────────────────
// 从配置文件读取配置
// ──────────────────────────────────────────
function loadConfig() {
  const configPath = path.join(__dirname, '..', 'config.json');

  if (!fs.existsSync(configPath)) {
    throw new Error(`配置文件不存在: ${configPath}`);
  }

  const content = fs.readFileSync(configPath, 'utf-8');
  return JSON.parse(content);
}

const config = loadConfig();
const ACCOUNTS = config.accounts;
const APP_KEY = config.easemob.appKey;

// ──────────────────────────────────────────
// Polyfill
// ──────────────────────────────────────────
const { applyManualPolyfill } = require('./easemob-polyfill');

// ──────────────────────────────────────────
// 为账号创建连接实例并登录
// ──────────────────────────────────────────
function createConnection(account, websdk, appConfig) {
  const conn = new websdk.connection({
    appKey: appConfig.appKey,
    debug: appConfig.debug || false,
  });

  const peer = account.label === 'bot' ? ACCOUNTS.tester : ACCOUNTS.bot;

  // 消息统计（per-account）
  const stats = { sent: 0, received: 0 };

  conn.listen({
    onOpened: () => {
      console.log(`\n  [${account.label}] ✅ 登录成功！`);
    },

    onClosed: () => {
      console.log(`  [${account.label}] 连接已关闭`);
    },

    onError: (error) => {
      const errMsg = error?.message || error?.data?.error_description || JSON.stringify(error);
      console.error(`  [${account.label}] ❌ Error: ${errMsg}`);
    },

    onTextMessage: (message) => {
      stats.received++;
      const from = message.from || 'unknown';
      const data = message.data || '';

      console.log(`\n  [${account.label}] 📩 收到消息 from=${from}: "${data}"`);

      // 自动 echo 回复
      const replyText = `[${account.label} Echo] 收到: "${data.substring(0, 30)}"`;
      sendTextMessage(conn, websdk, from, replyText, account.label, stats);
    },

    onPresence: (message) => {
      console.log(`  [${account.label}] Presence: ${message?.type} from ${message?.from || ''}`);
    },
  });

  return { conn, stats, account, peer };
}

// ──────────────────────────────────────────
// 发送文本消息
// ──────────────────────────────────────────
function sendTextMessage(conn, websdk, to, text, label, stats) {
  try {
    const message = new websdk.message({
      to,
      type: 'chat',
      msg: text,
      chatType: 'singleChat',
    });
    const result = conn.send(message);
    // conn.send 可能返回 Promise
    if (result && typeof result.catch === 'function') {
      result.catch((err) => {
        console.error(`  [${label}] ❌ 发送失败(async): ${err?.message || err}`);
      });
    }
    stats.sent++;
    console.log(`  [${label}] 📤 已发送 -> ${to}: "${text}"`);
  } catch (err) {
    console.error(`  [${label}] ❌ 发送失败: ${err.message}`);
  }
}

// ──────────────────────────────────────────
// 延时工具
// ──────────────────────────────────────────
const delay = (ms) => new Promise((r) => setTimeout(r, ms));

// ──────────────────────────────────────────
// 主流程
// ──────────────────────────────────────────
async function main() {
  const customMsg = process.argv.slice(2).join(' ') || '你好，这是双向测试消息！';

  console.log('=== 环信双向消息收发测试 ===');
  console.log(`  Bot 账号: ${ACCOUNTS.bot.user}`);
  console.log(`  测试账号: ${ACCOUNTS.tester.user}`);
  console.log(`  初始消息: "${customMsg}"`);
  console.log('================================\n');

  // Step 1: 显示配置
  console.log('[Step 1] 加载配置...');
  console.log(`  AppKey: ${config.easemob.appKey}`);
  console.log(`  REST Server: ${config.easemob.restServer}`);
  console.log(`  Socket Server: ${config.easemob.socketServer}`);

  // Step 2: Polyfill
  console.log('\n[Step 2] 应用 Polyfill...');
  applyManualPolyfill();

  // WebSocket polyfill
  try {
    const wsModule = require('ws');
    const OriginalWebSocket = wsModule.WebSocket || wsModule;
    globalThis.WebSocket = function DebugWebSocket(url, protocols, options) {
      console.log(`  [WS] new WebSocket(${JSON.stringify(url)})`);
      if (protocols !== undefined) {
        return new OriginalWebSocket(url, protocols, options);
      }
      return new OriginalWebSocket(url);
    };
    Object.assign(globalThis.WebSocket, OriginalWebSocket);
    globalThis.WebSocket.prototype = OriginalWebSocket.prototype;
    console.log('  + WebSocket = ws (debug-wrapped)');
  } catch (err) {
    console.warn('  ! ws 包未安装:', err.message);
  }

  // XHR polyfill
  try {
    const { XMLHttpRequest } = require('xhr2');
    globalThis.XMLHttpRequest = XMLHttpRequest;
    const baseUrl = config.easemob.restServer;
    const origOpen = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function patchedOpen(method, url, ...rest) {
      let finalUrl = url;
      if (typeof url === 'string' && url.startsWith('/')) {
        finalUrl = baseUrl + url;
      }
      return origOpen.call(this, method, finalUrl, ...rest);
    };
    console.log(`  + XMLHttpRequest = xhr2 (base: ${baseUrl})`);
  } catch {
    console.warn('  ! xhr2 包未安装');
  }

  // Step 3: 加载 SDK
  console.log('\n[Step 3] 加载 easemob-websdk...');
  let websdk;
  try {
    const rawSdk = require('easemob-websdk');
    websdk = rawSdk.default || rawSdk;
    console.log('  SDK 加载成功 ✓');
  } catch (err) {
    console.error('✗ SDK 加载失败:', err.message);
    process.exit(1);
  }

  // Step 4: 创建两个连接
  console.log('\n[Step 4] 创建双用户连接...');

  const botCtx = createConnection(ACCOUNTS.bot, websdk, config.easemob);
  const testerCtx = createConnection(ACCOUNTS.tester, websdk, config.easemob);

  console.log('  两个连接实例创建成功 ✓');

  // Step 5: 双方登录
  console.log('\n[Step 5] 双方登录...');

  const loginPromises = [
    (async () => {
      try {
        await botCtx.conn.open({ user: ACCOUNTS.bot.user, pwd: ACCOUNTS.bot.pwd });
      } catch (err) {
        console.error(`  [bot] 登录失败: ${err.message}`);
      }
    })(),
    (async () => {
      try {
        await testerCtx.conn.open({ user: ACCOUNTS.tester.user, pwd: ACCOUNTS.tester.pwd });
      } catch (err) {
        console.error(`  [tester] 登录失败: ${err.message}`);
      }
    })(),
  ];

  await Promise.all(loginPromises);

  // 等待连接建立
  console.log('\n  等待双方连接建立...');
  await delay(5000);

  // Step 6: 双向发消息
  console.log('\n[Step 6] 开始双向消息测试...\n');

  // tester -> bot
  console.log('--- 测试 1: testuser1 -> originclaw_bot ---');
  sendTextMessage(
    testerCtx.conn, websdk,
    ACCOUNTS.bot.user, customMsg,
    testerCtx.account.label, testerCtx.stats
  );

  await delay(3000);

  // bot -> tester
  console.log('\n--- 测试 2: originclaw_bot -> testuser1 ---');
  sendTextMessage(
    botCtx.conn, websdk,
    ACCOUNTS.tester.user, `[Bot] ${customMsg}`,
    botCtx.account.label, botCtx.stats
  );

  await delay(3000);

  // Step 7: 统计结果
  console.log('\n\n=== 测试结果 ===');
  console.log(`  [${botCtx.account.label}]    发送: ${botCtx.stats.sent}, 接收: ${botCtx.stats.received}`);
  console.log(`  [${testerCtx.account.label}] 发送: ${testerCtx.stats.sent}, 接收: ${testerCtx.stats.received}`);
  console.log('\n保持连接中... (Ctrl+C 退出)\n');

  // 优雅退出
  const cleanup = () => {
    console.log('\n=== 退出统计 ===');
    console.log(`  [${botCtx.account.label}]    发送: ${botCtx.stats.sent}, 接收: ${botCtx.stats.received}`);
    console.log(`  [${testerCtx.account.label}] 发送: ${testerCtx.stats.sent}, 接收: ${testerCtx.stats.received}`);
    try { botCtx.conn.close(); } catch {}
    try { testerCtx.conn.close(); } catch {}
    setTimeout(() => process.exit(0), 500);
  };

  process.on('SIGINT', cleanup);
  process.on('SIGTERM', cleanup);
}

// 防止未处理的 Promise 拒绝导致进程崩溃
process.on('unhandledRejection', (reason) => {
  console.error('⚠ unhandledRejection:', reason?.message || reason);
});

// ─── 启动 ───
main().catch((err) => {
  console.error('Fatal error:', err);
  process.exit(1);
});