import {
  WebSocketGateway,
  WebSocketServer,
  SubscribeMessage,
  OnGatewayConnection,
  OnGatewayDisconnect,
} from '@nestjs/websockets';
import { Server, Socket } from 'socket.io';
import { RoomsService } from '../rooms/rooms.service';

@WebSocketGateway({
  cors: {
    // Примечание: декоратор выполняется на этапе инициализации,
    // ConfigModule.forRoot() уже загружает переменные в process.env
    origin: process.env.CORS_ORIGIN || 'http://localhost:5173',
    credentials: true,
  },
})
export class GameGateway implements OnGatewayConnection, OnGatewayDisconnect {
  @WebSocketServer()
  server: Server;

  constructor(private roomsService: RoomsService) {}

  handleConnection(client: Socket) {
    console.log(`Client connected: ${client.id}`);
  }

  handleDisconnect(client: Socket) {
    console.log(`Client disconnected: ${client.id}`);
  }

  @SubscribeMessage('joinRoom')
  async handleJoinRoom(client: Socket, payload: { roomCode: string; userId: string }) {
    client.join(payload.roomCode);
    const room = await this.roomsService.getRoomByCode(payload.roomCode);
    this.server.to(payload.roomCode).emit('roomUpdate', room);
  }

  @SubscribeMessage('startGame')
  async handleStartGame(client: Socket, payload: { roomId: string; roomCode: string }) {
    await this.roomsService.updateRoomStatus(payload.roomId, 'PLAYING');
    const room = await this.roomsService.getRoomByCode(payload.roomCode);
    if (room) {
      this.server.to(room.code).emit('gameStarted', room);
    }
  }

  @SubscribeMessage('revealAnswer')
  handleRevealAnswer(client: Socket, payload: { roomCode: string; answerIndex: number }) {
    this.server.to(payload.roomCode).emit('answerRevealed', payload);
  }

  @SubscribeMessage('updateScore')
  async handleUpdateScore(client: Socket, payload: { participantId: string; score: number; roomCode: string }) {
    await this.roomsService.updateParticipantScore(payload.participantId, payload.score);
    this.server.to(payload.roomCode).emit('scoreUpdated', payload);
  }

  @SubscribeMessage('nextQuestion')
  handleNextQuestion(client: Socket, payload: { roomCode: string }) {
    this.server.to(payload.roomCode).emit('questionChanged', payload);
  }

  @SubscribeMessage('endGame')
  async handleEndGame(client: Socket, payload: { roomId: string; roomCode: string }) {
    await this.roomsService.updateRoomStatus(payload.roomId, 'FINISHED');
    this.server.to(payload.roomCode).emit('gameEnded', payload);
  }
}