import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { customAlphabet } from 'nanoid';

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

@Injectable()
export class RoomsService {
  constructor(private prisma: PrismaService) {}

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

    const room = await this.prisma.room.create({
      data: {
        code,
        hostId,
        questionPackId,
        expiresAt,
        ...settings,
      },
      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') {
    return this.prisma.participant.create({
      data: {
        userId,
        roomId,
        name,
        role,
      },
    });
  }

  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 },
    });
  }
}