const express = require('express');
const router = express.Router();
const roomStore = require('../store/roomStore');
const http = require('http');

// Java 后端地址 (host.docker.internal 用于从 Docker 容器访问宿主机)
const JAVA_BACKEND_HOST = process.env.JAVA_BACKEND_HOST || 'host.docker.internal';
const JAVA_BACKEND_PORT = process.env.JAVA_BACKEND_PORT || 8081;

// 转发到 Java 后端
function forwardToJava(path, data) {
  const postData = JSON.stringify(data);
  const options = {
    hostname: JAVA_BACKEND_HOST,
    port: JAVA_BACKEND_PORT,
    path: path,
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': Buffer.byteLength(postData)
    },
    timeout: 5000
  };

  const req = http.request(options, (res) => {
    console.log(`[SRS->Java] ${path} 响应状态: ${res.statusCode}`);
  });

  req.on('error', (e) => {
    console.error(`[SRS->Java] ${path} 转发失败: ${e.message}`);
  });

  req.on('timeout', () => {
    console.error(`[SRS->Java] ${path} 转发超时`);
    req.destroy();
  });

  req.write(postData);
  req.end();
}

// POST /api/srs/on_publish - 推流开始回调
router.post('/on_publish', (req, res) => {
  const { app, stream } = req.body;
  
  console.log(`[SRS] 推流开始: app=${app}, stream=${stream}`);
  
  // 更新内存存储
  const room = roomStore.setLiveStatus(stream, true);
  
  if (room) {
    console.log(`[SRS] 房间 "${room.title}" 开始直播`);
  } else {
    console.log(`[SRS] 未找到对应房间，streamKey=${stream}`);
  }
  
  // 转发到 Java 后端更新数据库
  forwardToJava('/api/front/live/srs/on_publish', { stream });
  
  // SRS 要求返回 code: 0 表示成功
  res.json({ code: 0 });
});

// POST /api/srs/on_unpublish - 推流结束回调
router.post('/on_unpublish', (req, res) => {
  const { app, stream } = req.body;
  
  console.log(`[SRS] 推流结束: app=${app}, stream=${stream}`);
  
  // 暂时禁用自动关闭直播，改为手动控制
  // 这样可以避免网络波动导致直播状态被误重置
  // const room = roomStore.setLiveStatus(stream, false);
  // forwardToJava('/api/front/live/srs/on_unpublish', { stream });
  
  res.json({ code: 0 });
});

// POST /api/srs/on_play - 观看回调 (可选)
router.post('/on_play', (req, res) => {
  const { app, stream } = req.body;
  console.log(`[SRS] 观众进入: app=${app}, stream=${stream}`);
  res.json({ code: 0 });
});

// POST /api/srs/on_stop - 停止观看回调 (可选)
router.post('/on_stop', (req, res) => {
  const { app, stream } = req.body;
  console.log(`[SRS] 观众离开: app=${app}, stream=${stream}`);
  res.json({ code: 0 });
});

module.exports = router;