import { PrismaService } from '@/src/core/prisma/prisma.service'
import { Injectable, NotFoundException } from '@nestjs/common'

@Injectable()
export class CategoryService {
  constructor(
    private readonly prismaService: PrismaService,
  ) {
  }

  public async findAll() {
    return this.prismaService.category.findMany({
      orderBy: { createdAt: 'desc' },
      include: {
        streams: {
          include: {
            user: true,
            category: true,
          },
        },
      },
    })
  }

  public async findRandom() {
    const total = await this.prismaService.category.count({})

    const randomIndexes = new Set<number>()
    while (randomIndexes.size < 7) {
      const randomIndex = Math.floor(Math.random() * total)
      randomIndexes.add(randomIndex)
    }

    const categories = await this.prismaService.category.findMany({
      take: total,
      skip: 0,
      include: {
        streams: {
          include: {
            user: true,
            category: true,
          },
        },
      },
    })

    return Array.from(randomIndexes).map(index => categories[index])
  }

  public async findBySlug(slug: string) {
    const category = await this.prismaService.category.findUnique({
      where: {
        slug,
      },
      include: {
        streams: {
          include: {
            user: true,
            category: true,
          },
        },
      },
    })

    if (!category) {
      throw new NotFoundException('Категория не найдена')
    }

    return category
  }
}