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

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

  async getBlogs(query: any) {
    const { page = 1, limit = 10, search = '' } = query;
    const skip = (Number(page) - 1) * Number(limit);
    
    const where = search ? { title: { contains: search, mode: 'insensitive' as any } } : {};
    
    const [data, total] = await Promise.all([
      this.prisma.blog.findMany({
        where,
        skip,
        take: Number(limit),
        orderBy: { createdAt: 'desc' },
        include: { author: { select: { firstName: true, lastName: true } } }
      }),
      this.prisma.blog.count({ where })
    ]);

    return {
      data,
      meta: { total, page: Number(page), limit: Number(limit), lastPage: Math.ceil(total / Number(limit)) }
    };
  }

  async createBlog(data: any, authorId: string) {
    return this.prisma.blog.create({ 
      data: { ...data, authorId }
    });
  }

  async updateBlog(id: string, data: any) {
    const blog = await this.prisma.blog.findUnique({ where: { id } });
    if (!blog) throw new NotFoundException('Blog not found');
    return this.prisma.blog.update({ where: { id }, data });
  }

  async deleteBlog(id: string) {
    const blog = await this.prisma.blog.findUnique({ where: { id } });
    if (!blog) throw new NotFoundException('Blog not found');
    return this.prisma.blog.delete({ where: { id } });
  }
}