import {
  WebSocketGateway,
  WebSocketServer,
  SubscribeMessage,
  OnGatewayConnection,
  OnGatewayDisconnect,
  OnGatewayInit,
} from '@nestjs/websockets';
import { Server, Socket } from 'socket.io';
import { RoomsService } from '../rooms/rooms.service';
import { RoomEventsService } from './room-events.service';
import { PrismaService } from '../prisma/prisma.service';
import { RoomPackService } from '../room-pack/room-pack.service';

interface PlayerAction {
  action: 'revealAnswer' | 'nextQuestion' | 'prevQuestion';
  roomId: string;
  roomCode: string;
  userId: string;
  participantId: string;
  // Для revealAnswer:
  questionId?: string;  // UUID вопроса
  answerId?: string;    // UUID ответа
}

@WebSocketGateway({
  cors: {
    origin: process.env.CORS_ORIGIN || 'http://localhost:5173',
    credentials: true,
  },
})
export class GameGateway implements OnGatewayConnection, OnGatewayDisconnect, OnGatewayInit {
  @WebSocketServer()
  server: Server;

  constructor(
    private roomsService: RoomsService,
    private roomEventsService: RoomEventsService,
    private prisma: PrismaService,
    private roomPackService: RoomPackService,
  ) {}

  afterInit(server: Server) {
    this.roomEventsService.setServer(server);
  }

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

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

  private async isHost(roomId: string, userId: string): Promise<boolean> {
    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      select: { hostId: true },
    });
    return room?.hostId === userId;
  }

  private async isCurrentPlayer(roomId: string, participantId: string): Promise<boolean> {
    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      select: { currentPlayerId: true },
    });
    return room?.currentPlayerId === participantId;
  }

  @SubscribeMessage('joinRoom')
  async handleJoinRoom(client: Socket, payload: { roomCode: string; userId: string }) {
    client.join(payload.roomCode);
    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('startGame')
  async handleStartGame(client: Socket, payload: { roomId: string; roomCode: string; userId: string }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can start the game' });
      return;
    }

    await this.roomsService.updateRoomStatus(payload.roomId, 'PLAYING');
    
    // Инициализировать первый вопрос и игрока
    const room = await this.prisma.room.findUnique({
      where: { id: payload.roomId },
      include: {
        roomPack: true,
        participants: { where: { isActive: true }, orderBy: { joinedAt: 'asc' } }
      }
    });

    if (room) {
      const questions = room.roomPack?.questions as any[] || [];
      const firstQuestion = questions[0];
      const firstParticipant = room.participants[0];

      if (firstQuestion && firstParticipant) {
        await this.prisma.room.update({
          where: { id: payload.roomId },
          data: {
            currentQuestionId: firstQuestion.id,
            currentPlayerId: firstParticipant.id,
          }
        });
      }
    }

    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('playerAction')
  async handlePlayerAction(client: Socket, payload: PlayerAction) {
    // Получаем комнату с данными
    const room = await this.prisma.room.findUnique({
      where: { id: payload.roomId },
      include: {
        roomPack: true,
        participants: { where: { isActive: true }, orderBy: { joinedAt: 'asc' } }
      },
    });

    if (!room) {
      client.emit('error', { message: 'Room not found' });
      return;
    }

    // Проверяем права
    const isHost = room.hostId === payload.userId;
    const isCurrentPlayer = room.currentPlayerId === payload.participantId;

    if (!isHost && !isCurrentPlayer) {
      client.emit('error', { message: 'Not your turn!' });
      return;
    }

    // Выполняем действие
    try {
      switch (payload.action) {
        case 'revealAnswer':
          await this.handleRevealAnswerAction(payload, room);
          break;
        case 'nextQuestion':
          await this.handleNextQuestionAction(payload, room);
          break;
        case 'prevQuestion':
          await this.handlePrevQuestionAction(payload, room);
          break;
      }

      // Отправляем полное состояние всем
      await this.broadcastFullState(payload.roomCode);
    } catch (error) {
      console.error('Error handling player action:', error);
      client.emit('error', { message: 'Failed to process action' });
    }
  }

  private async handleRevealAnswerAction(payload: PlayerAction, room: any) {
    if (!payload.questionId || !payload.answerId) {
      console.error('Missing questionId or answerId in payload');
      return;
    }

    const questions = room.roomPack?.questions as any[] || [];
    const question = questions.find(q => q.id === payload.questionId);
    
    if (!question) {
      console.error('Question not found:', payload.questionId);
      return;
    }

    const answer = question.answers?.find((a: any) => a.id === payload.answerId);
    if (!answer) {
      console.error('Answer not found:', payload.answerId);
      return;
    }

    // Обновляем revealedAnswers
    const revealed = (room.revealedAnswers as any) || {};
    const currentRevealed: string[] = revealed[payload.questionId] || [];

    if (!currentRevealed.includes(payload.answerId)) {
      currentRevealed.push(payload.answerId);
      revealed[payload.questionId] = currentRevealed;

      // Начисляем очки
      await this.prisma.participant.update({
        where: { id: payload.participantId },
        data: { score: { increment: answer.points } }
      });

      // Сохраняем revealedAnswers
      await this.prisma.room.update({
        where: { id: payload.roomId },
        data: { revealedAnswers: revealed }
      });

      // Определяем следующего игрока
      const participants = room.participants;
      const currentIdx = participants.findIndex((p: any) => p.id === payload.participantId);
      const nextIdx = (currentIdx + 1) % participants.length;
      const nextPlayerId = participants[nextIdx]?.id;

      // Проверяем, это последний ответ?
      const isLastAnswer = currentRevealed.length >= question.answers.length;

      if (!isLastAnswer) {
        // Меняем игрока
        await this.prisma.room.update({
          where: { id: payload.roomId },
          data: { currentPlayerId: nextPlayerId }
        });
      } else {
        // Последний ответ - проверяем, последний ли вопрос
        const currentQuestionIndex = questions.findIndex((q: any) => q.id === payload.questionId);
        const isLastQuestion = currentQuestionIndex >= questions.length - 1;

        if (isLastQuestion) {
          // Конец игры
          await this.prisma.room.update({
            where: { id: payload.roomId },
            data: {
              status: 'FINISHED',
              isGameOver: true,
              finishedAt: new Date()
            }
          });
        } else {
          // Меняем игрока для следующего вопроса
          await this.prisma.room.update({
            where: { id: payload.roomId },
            data: { currentPlayerId: nextPlayerId }
          });
        }
      }
    }
  }

  private async handleNextQuestionAction(payload: PlayerAction, room: any) {
    const questions = room.roomPack?.questions as any[] || [];
    const currentIdx = questions.findIndex((q: any) => q.id === room.currentQuestionId);

    if (currentIdx < questions.length - 1) {
      const nextQuestion = questions[currentIdx + 1];
      await this.prisma.room.update({
        where: { id: payload.roomId },
        data: {
          currentQuestionId: nextQuestion.id,
          currentQuestionIndex: currentIdx + 1  // Для совместимости
        }
      });
    }
  }

  private async handlePrevQuestionAction(payload: PlayerAction, room: any) {
    const questions = room.roomPack?.questions as any[] || [];
    const currentIdx = questions.findIndex((q: any) => q.id === room.currentQuestionId);

    if (currentIdx > 0) {
      const prevQuestion = questions[currentIdx - 1];
      await this.prisma.room.update({
        where: { id: payload.roomId },
        data: {
          currentQuestionId: prevQuestion.id,
          currentQuestionIndex: currentIdx - 1  // Для совместимости
        }
      });
    }
  }

  // КЛЮЧЕВОЙ МЕТОД: Отправка полного состояния
  private async broadcastFullState(roomCode: string) {
    const room = await this.prisma.room.findUnique({
      where: { code: roomCode },
      include: {
        participants: {
          where: { isActive: true },
          orderBy: { joinedAt: 'asc' }
        },
        roomPack: true,
        host: { select: { id: true, name: true } }
      }
    });

    if (!room) return;

    const questions = room.roomPack?.questions as any[] || [];

    // Инициализация currentQuestionId если не установлен
    let currentQuestionId = room.currentQuestionId;
    if (!currentQuestionId && questions.length > 0) {
      currentQuestionId = questions[0].id;
      await this.prisma.room.update({
        where: { id: room.id },
        data: { currentQuestionId }
      });
    }

    const fullState = {
      roomId: room.id,
      roomCode: room.code,
      status: room.status,
      currentQuestionId: currentQuestionId,
      currentPlayerId: room.currentPlayerId,
      revealedAnswers: room.revealedAnswers,
      isGameOver: room.isGameOver,
      hostId: room.hostId,
      participants: room.participants.map(p => ({
        id: p.id,
        userId: p.userId,
        name: p.name,
        role: p.role,
        score: p.score
      })),
      questions: questions.map((q: any) => ({
        id: q.id,
        text: q.text || q.question,
        answers: (q.answers || []).map((a: any) => ({
          id: a.id,
          text: a.text,
          points: a.points
        }))
      }))
    };

    this.server.to(roomCode).emit('gameStateUpdated', fullState);
  }

  @SubscribeMessage('requestFullState')
  async handleRequestFullState(client: Socket, payload: { roomCode: string }) {
    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('endGame')
  async handleEndGame(client: Socket, payload: { roomId: string; roomCode: string; userId: string }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can end the game' });
      return;
    }

    await this.roomsService.updateRoomStatus(payload.roomId, 'FINISHED');
    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('restartGame')
  async handleRestartGame(client: Socket, payload: { roomId: string; roomCode: string; userId: string }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can restart the game' });
      return;
    }

    const room = await this.prisma.room.findUnique({
      where: { id: payload.roomId },
      include: {
        roomPack: true,
        participants: { where: { isActive: true }, orderBy: { joinedAt: 'asc' } }
      }
    });

    const questions = room?.roomPack?.questions as any[] || [];
    const firstQuestion = questions[0];
    const firstParticipant = room?.participants[0];

    await this.prisma.room.update({
      where: { id: payload.roomId },
      data: {
        status: 'WAITING',
        currentQuestionIndex: 0,
        currentQuestionId: firstQuestion?.id || null,
        revealedAnswers: {},
        currentPlayerId: firstParticipant?.id || null,
        isGameOver: false,
        answeredQuestions: 0,
      },
    });

    await this.prisma.participant.updateMany({
      where: { roomId: payload.roomId },
      data: { score: 0 },
    });

    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('updateRoomPack')
  async handleUpdateRoomPack(client: Socket, payload: { roomId: string; roomCode: string; userId: string; questions: any[] }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can update questions' });
      return;
    }

    await this.roomsService.updateRoomPack(payload.roomId, payload.questions);
    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('importQuestions')
  async handleImportQuestions(client: Socket, payload: {
    roomId: string;
    roomCode: string;
    userId: string;
    sourcePackId: string;
    questionIndices: number[];
  }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can import questions' });
      return;
    }

    await this.roomPackService.importQuestions(payload.roomId, payload.sourcePackId, payload.questionIndices);
    await this.broadcastFullState(payload.roomCode);
  }

  @SubscribeMessage('kickPlayer')
  async handleKickPlayer(client: Socket, payload: { roomId: string; roomCode: string; userId: string; participantId: string }) {
    const isHost = await this.isHost(payload.roomId, payload.userId);
    if (!isHost) {
      client.emit('error', { message: 'Only the host can kick players' });
      return;
    }

    await this.prisma.participant.update({
      where: { id: payload.participantId },
      data: { isActive: false },
    });

    await this.broadcastFullState(payload.roomCode);
  }
}