liars-bar-game/server/game/room.js

const { v4: uuidv4 } = require('uuid');
const GameEngine = require('./engine');

class RoomManager {
  constructor() {
    this.rooms = new Map();
  }

  // 建立房間
  createRoom(hostId) {
    const roomId = uuidv4().substring(0, 8);
    const room = {
      id: roomId,
      hostId,
      players: [hostId],
      engine: null,
      gameState: null,
      status: 'waiting', // waiting, playing, ended
      maxPlayers: 4, // 20 張牌 ÷ 5 張 = 最多 4 人
      minPlayers: 2
    };

    this.rooms.set(roomId, room);
    return room;
  }

  // 加入房間
  joinRoom(roomId, playerId) {
    const room = this.rooms.get(roomId);
    if (!room) {
      return { error: '房間不存在' };
    }

    if (room.status !== 'waiting') {
      return { error: '遊戲已開始，無法加入' };
    }

    if (room.players.length >= room.maxPlayers) {
      return { error: '房間已滿' };
    }

    if (room.players.includes(playerId)) {
      return { error: '已在房間中' };
    }

    room.players.push(playerId);
    return { success: true, room };
  }

  // 開始遊戲
  startGame(roomId) {
    const room = this.rooms.get(roomId);
    if (!room) {
      return { error: '房間不存在' };
    }

    if (room.players.length < room.minPlayers) {
      return { error: '人數不足' };
    }

    if (room.status !== 'waiting') {
      return { error: '遊戲已開始' };
    }

    const engine = new GameEngine();
    const gameState = engine.init(room.players);
    
    room.engine = engine; // 儲存引擎
    room.gameState = gameState;
    room.status = 'playing';

    return { success: true, gameState };
  }

  // 取得房間
  getRoom(roomId) {
    return this.rooms.get(roomId);
  }

  // 列出房間
  listRooms() {
    const rooms = [];
    for (const [id, room] of this.rooms) {
      rooms.push({
        id: room.id,
        players: room.players.length,
        maxPlayers: room.maxPlayers,
        status: room.status
      });
    }
    return rooms;
  }

  // 移除玩家
  removePlayer(playerId) {
    for (const [roomId, room] of this.rooms) {
      if (room.players.includes(playerId)) {
        room.players = room.players.filter(id => id !== playerId);
        
        // 如果房間人數不足，結束遊戲
        if (room.players.length < room.minPlayers && room.status === 'playing') {
          room.status = 'ended';
        }
        
        return { roomId, room };
      }
    }
    return null;
  }
}

module.exports = RoomManager;