import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { customAlphabet } from 'nanoid';
import { RoomEventsService } from '../game/room-events.service';

const nanoid = customAlphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', 6);

@Injectable()
export class RoomsService {
  constructor(
    private prisma: PrismaService,
    @Inject(forwardRef(() => RoomEventsService))
    private roomEventsService: RoomEventsService,
  ) {}

  async createRoom(hostId: string, questionPackId?: string, settings?: any) {
    const code = nanoid();
    const expiresAt = new Date(Date.now() + 24 * 60 * 60 * 1000); // 24 hours

    // Remove undefined values from settings and ensure questionPackId is handled correctly
    const cleanSettings = settings ? { ...settings } : {};
    if ('questionPackId' in cleanSettings) {
      delete cleanSettings.questionPackId;
    }

    const room = await this.prisma.room.create({
      data: {
        code,
        hostId,
        expiresAt,
        ...cleanSettings,
        questionPackId: questionPackId || null,
      },
      include: {
        host: true,
        questionPack: true,
      },
    });

    await this.prisma.participant.create({
      data: {
        userId: hostId,
        roomId: room.id,
        name: room.host.name || 'Host',
        role: 'HOST',
      },
    });

    return room;
  }

  async getRoomByCode(code: string) {
    return this.prisma.room.findUnique({
      where: { code },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });
  }

  async joinRoom(roomId: string, userId: string, name: string, role: 'PLAYER' | 'SPECTATOR') {
    const participant = await this.prisma.participant.create({
      data: {
        userId,
        roomId,
        name,
        role,
      },
    });

    // Получаем обновленную комнату со всеми участниками
    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    // Отправляем событие roomUpdate всем клиентам в комнате
    if (room) {
      this.roomEventsService.emitRoomUpdate(room.code, room);
    }

    return participant;
  }

  async updateRoomStatus(roomId: string, status: 'WAITING' | 'PLAYING' | 'FINISHED') {
    return this.prisma.room.update({
      where: { id: roomId },
      data: { status },
    });
  }

  async updateParticipantScore(participantId: string, score: number) {
    return this.prisma.participant.update({
      where: { id: participantId },
      data: { score },
    });
  }

  async updateQuestionPack(roomId: string, questionPackId: string) {
    return this.prisma.room.update({
      where: { id: roomId },
      data: {
        questionPackId,
        currentQuestionIndex: 0,
        revealedAnswers: {},
      },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });
  }

  async updateCustomQuestions(roomId: string, questions: any) {
    const room = await this.prisma.room.update({
      where: { id: roomId },
      data: {
        customQuestions: questions,
        currentQuestionIndex: 0,
        revealedAnswers: {},
      },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    this.roomEventsService.emitCustomQuestionsUpdated(room.code, room);
    return room;
  }

  async getEffectiveQuestions(roomId: string) {
    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      include: { questionPack: true },
    });

    if (!room) {
      return null;
    }

    // Если есть кастомные вопросы, используем их
    if (room.customQuestions) {
      return room.customQuestions;
    }

    // Иначе используем вопросы из пака
    if (room.questionPack) {
      return room.questionPack.questions;
    }

    return null;
  }

  async updateRoomSettings(roomId: string, settings: any) {
    const room = await this.prisma.room.update({
      where: { id: roomId },
      data: settings,
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    this.roomEventsService.emitRoomUpdate(room.code, room);
    return room;
  }

  async restartGame(roomId: string) {
    await this.prisma.room.update({
      where: { id: roomId },
      data: {
        status: 'WAITING',
        currentQuestionIndex: 0,
        revealedAnswers: {},
        currentPlayerId: null,
        isGameOver: false,
        answeredQuestions: 0,
      },
    });

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

    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    if (room) {
      this.roomEventsService.emitGameRestarted(room.code, room);
    }

    return room;
  }

  async setCurrentPlayer(roomId: string, playerId: string) {
    const room = await this.prisma.room.update({
      where: { id: roomId },
      data: { currentPlayerId: playerId },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    this.roomEventsService.emitCurrentPlayerChanged(room.code, { playerId });
    return room;
  }

  async kickPlayer(roomId: string, participantId: string) {
    await this.prisma.participant.update({
      where: { id: participantId },
      data: { isActive: false },
    });

    const room = await this.prisma.room.findUnique({
      where: { id: roomId },
      include: {
        host: true,
        participants: {
          include: { user: true },
        },
        questionPack: true,
      },
    });

    if (room) {
      this.roomEventsService.emitPlayerKicked(room.code, { participantId, room });
    }

    return room;
  }
}