const { v4: uuidv4 } = require('uuid');
const fs = require('fs');
const path = require('path');

// 持久化文件路径
const STORAGE_FILE = path.join(__dirname, '../../data/rooms.json');

// 确保数据目录存在
const ensureDataDir = () => {
  const dir = path.dirname(STORAGE_FILE);
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true });
  }
};

// 从文件加载房间数据
const loadRooms = () => {
  try {
    ensureDataDir();
    if (fs.existsSync(STORAGE_FILE)) {
      const data = fs.readFileSync(STORAGE_FILE, 'utf8');
      const roomsArray = JSON.parse(data);
      return new Map(roomsArray.map(room => [room.id, room]));
    }
  } catch (e) {
    console.warn('[RoomStore] Failed to load rooms from file:', e.message);
  }
  return new Map();
};

// 保存房间数据到文件
const saveRooms = (rooms) => {
  try {
    ensureDataDir();
    const roomsArray = Array.from(rooms.values());
    fs.writeFileSync(STORAGE_FILE, JSON.stringify(roomsArray, null, 2), 'utf8');
  } catch (e) {
    console.error('[RoomStore] Failed to save rooms to file:', e.message);
  }
};

// 内存存储（从文件加载）
const rooms = loadRooms();
console.log(`[RoomStore] Loaded ${rooms.size} rooms from storage`);

const roomStore = {
  // 创建房间
  create(data) {
    const id = uuidv4();
    const room = {
      id,
      title: data.title,
      streamerName: data.streamerName,
      streamKey: id,
      isLive: false,
      viewerCount: 0,
      createdAt: new Date().toISOString(),
      startedAt: null
    };
    rooms.set(id, room);
    saveRooms(rooms);
    return room;
  },

  // 获取所有房间
  getAll() {
    return Array.from(rooms.values());
  },

  // 根据 ID 获取房间
  getById(id) {
    return rooms.get(id) || null;
  },

  // 根据 streamKey 获取房间
  getByStreamKey(streamKey) {
    return rooms.get(streamKey) || null;
  },

  // 更新房间
  update(id, data) {
    const room = rooms.get(id);
    if (!room) return null;
    
    const updated = { ...room, ...data };
    rooms.set(id, updated);
    saveRooms(rooms);
    return updated;
  },

  // 设置直播状态
  setLiveStatus(streamKey, isLive) {
    const room = rooms.get(streamKey);
    if (!room) return null;
    
    room.isLive = isLive;
    room.startedAt = isLive ? new Date().toISOString() : null;
    rooms.set(streamKey, room);
    saveRooms(rooms);
    return room;
  },

  // 删除房间
  delete(id) {
    const result = rooms.delete(id);
    if (result) saveRooms(rooms);
    return result;
  },

  // 清空所有房间 (测试用)
  clear() {
    rooms.clear();
  }
};

module.exports = roomStore;