/**
 * Express服务入口 - 安全加固版
 * LongShu/右枢 HF Space Backend
 */
import express from 'express';
import cors from 'cors';
import compression from 'compression';
import path from 'path';
import { gatewayAuth } from './middleware/auth';
import { errorHandler } from './middleware/errorHandler';
import { initCookieParser, requireAdmin, requireAdminApi } from './middleware/adminAuth';
import chatRouter from './routes/chat';
import healthRouter from './routes/health';
import dashboardRouter from './routes/dashboard';
import authRouter from './routes/auth';
import { startHeartbeatMonitor } from './lib/keepalive';
import { cleanupExpiredSessions } from './middleware/adminAuth';

const app = express();
const PORT = process.env.PORT || 3000;

// ─── 全局中间件 ───

app.use(cors({
  origin: [
    'https://chat.5e1.com',
    'https://game.5e1.com',
    'https://www.5e1.com',
    'http://localhost:3000',
    'http://localhost:3001',
  ],
  methods: ['GET', 'POST', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'x-5e1-secret', 'Authorization'],
}));

app.use(compression());
app.use(initCookieParser());
app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true }));

// ─── 静态文件 ───

app.use('/public', express.static(path.join(process.cwd(), 'public')));

// ─── 公开路由 ───

// 根路径 - 障眼法首页
app.get('/', (req, res) => {
  res.sendFile(path.join(process.cwd(), 'public', 'index.html'));
});

// 登录页面
app.get('/login', (req, res) => {
  res.sendFile(path.join(process.cwd(), 'public', 'login.html'));
});

// 健康检查（公开）
app.use('/internal/health', healthRouter);

// 登录 API（公开）
app.use('/api/auth', authRouter);

// ─── 保护路由 ───

// Dashboard 页面（Session 保护）
app.get('/dashboard', requireAdmin, (req, res) => {
  res.sendFile(path.join(process.cwd(), 'public', 'dashboard.html'));
});

// Dashboard API（Session 保护）
app.use('/internal/dashboard', dashboardRouter);

// ─── 内部通信路由（API Secret 保护） ───

// Chat API
app.use('/internal/chat', gatewayAuth, chatRouter);

// ─── 错误处理 ───

app.use(errorHandler);

// ─── 启动服务 ───

app.listen(PORT, () => {
  console.log(`[Backend] Server running on port ${PORT}`);
  console.log(`[Backend] Environment: ${process.env.NODE_ENV || 'development'}`);

  // 启动心跳监控
  startHeartbeatMonitor();

  // 定期清理过期 Session（每小时）
  setInterval(cleanupExpiredSessions, 60 * 60 * 1000);
});

export default app;