# All files / modules/favorites favorites.service.ts

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     import { PrismaClient } from '@prisma/client';

    const prisma = new PrismaClient();

    /**
     * 获取用户收藏列表（收藏的是书籍）
     */
    export async function getFavorites(userId: string) {
      const userIdNum = parseInt(userId);

      const favorites = await prisma.favorite.findMany({
        where: { userId: userIdNum },
        include: {
          book: {
            select: {
              id: true,
              title: true,
              subtitle: true,
              description: true,
              coverUrl: true,
              createdAt: true,
            },
          },
        },
        orderBy: { createdAt: 'desc' },
      });

      return favorites;
    }

    /**
     * 添加收藏（收藏书籍）
     */
    export async function addFavorite(userId: string, bookId: number) {
      const userIdNum = parseInt(userId);

      // 检查是否已存在
      const existing = await prisma.favorite.findUnique({
        where: {
          userId_bookId: {
            userId: userIdNum,
            bookId,
          },
        },
      });

      if (existing) {
        return existing;
      }

      return await prisma.favorite.create({
        data: {
          userId: userIdNum,
          bookId,
        },
        include: {
          book: {
            select: {
              id: true,
              title: true,
              subtitle: true,
              description: true,
              coverUrl: true,
              createdAt: true,
            },
          },
        },
      });
    }

    /**
     * 取消收藏
     */
    export async function removeFavorite(userId: string, bookId: number) {
      const userIdNum = parseInt(userId);

      return await prisma.favorite.delete({
        where: {
          userId_bookId: {
            userId: userIdNum,
            bookId,
          },
        },
      });
    }

    /**
     * 检查是否已收藏
     */
    export async function isFavorited(userId: string, bookId: number) {
      const userIdNum = parseInt(userId);

      const favorite = await prisma.favorite.findUnique({
        where: {
          userId_bookId: {
            userId: userIdNum,
            bookId,
          },
        },
      });

      return !!favorite;
    }