/**
 * @file server.js
 * @brief Express 服务器入口
 */

'use strict';

const express = require('express');
const path = require('path');
const Config = require('./src/core/config');
const { initDB } = require('./src/core/database');

// ==================== 初始化 ====================
initDB();

const app = express();

// 中间件
app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true }));

// 静态文件
app.use(express.static(path.join(__dirname, 'public')));
// 截图静态服务：data/screenshots/ → /screenshots/
app.use('/screenshots', express.static(path.join(Config.DATA_DIR, 'screenshots')));

// ==================== API 路由 ====================
app.use('/api/accounts', require('./src/routes/accounts'));
app.use('/api/settings', require('./src/routes/settings'));
app.use('/api/recharge-credentials', require('./src/routes/recharge_credentials'));
app.use('/api/workspace-refund-credentials', require('./src/routes/workspace_refund_credentials'));
app.use('/api/google-account-credentials', require('./src/routes/google_account_credentials'));
app.use('/api/feishu', require('./src/routes/feishu'));
app.use('/api/quota-monitor', require('./src/routes/quota_monitor'));
app.use('/api/operations', require('./src/routes/operations'));
app.use('/api/diagnostics', require('./src/routes/diagnostics'));
app.use('/api/static-proxies', require('./src/routes/static_proxies'));
app.use('/api/templates', require('./src/routes/templates'));
app.use('/api/backups', require('./src/routes/backups'));

// ==================== 前端路由 (SPA) ====================
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

// ==================== 错误处理 ====================
app.use((err, req, res, next) => {
  // body-parser 的解析异常可能携带原始请求体；充值请求中包含 API Secret
  // 或卡密，因此全局错误日志和响应都不能输出 err/body/message 原文。
  const status = Number.isInteger(err && err.status) && err.status >= 400 && err.status < 600
    ? err.status
    : 500;
  const type = String((err && err.type) || 'request_error')
    .replace(/[^a-z0-9_.-]/gi, '')
    .slice(0, 80) || 'request_error';
  console.error(`[Server] Request failed: type=${type} status=${status}`);
  res.status(status).json({
    success: false,
    msg: status >= 400 && status < 500 ? '请求格式无效' : '服务器内部错误',
  });
});

// ==================== 启动服务器 ====================
// 端口优先级：环境变量 PORT > src/core/config.js 中的 PORT > 3000
// 注意：启动程序.bat 会读取 config.js 中的 PORT 来打开浏览器，二者需保持一致
const PORT = Number(process.env.PORT) || Config.PORT || 3000;
const HOST = process.env.HOST || '0.0.0.0';
const server = app.listen(PORT, HOST, () => {
  require('./src/services/quota_monitor_scheduler').start();
  require('./src/services/refund_deadline_scheduler').start();
  require('./src/services/recharge_reconciler').start();
  const { networkInterfaces } = require('os');
  const nets = networkInterfaces();
  let localIP = 'localhost';
  for (const name of Object.keys(nets)) {
    for (const net of nets[name]) {
      if (net.family === 'IPv4' && !net.internal) {
        localIP = net.address;
        break;
      }
    }
  }
  console.log(`╔═══════════════════════════════════════╗`);
  console.log(`║   Gemini Go Web - Node.js版           ║`);
  console.log(`╠═══════════════════════════════════════╣`);
  console.log(`║   服务器已启动                         ║`);
  console.log(`║   本机: http://localhost:${PORT}          ║`);
  console.log(`║   局域网: http://${localIP}:${PORT}  ║`);
  console.log(`╚═══════════════════════════════════════╝`);
});

// 监听失败时给出明确提示（否则只会抛出一段堆栈，启动窗口一闪而过难以排查）
server.on('error', (err) => {
  const code = err && err.code ? err.code : '';
  if (code === 'EADDRINUSE') {
    console.error(`[Server] 启动失败：端口 ${PORT} 已被占用。`);
    console.error(`[Server] 请关闭仍在运行的旧 "Gemini Go Server" 窗口，或修改 src/core/config.js 中的 PORT 后重试。`);
  } else if (code === 'EACCES') {
    console.error(`[Server] 启动失败：没有权限监听 ${HOST}:${PORT}，请更换端口或以管理员身份运行。`);
  } else {
    console.error(`[Server] 启动失败：${code} ${err && err.message ? err.message : err}`);
  }
  process.exit(1);
});

module.exports = app;