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

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

  async findAll(filters: PaginationDto) {
    const { search, page = 1, limit = 10, sortBy = 'createdAt', sortOrder = 'desc' } = filters;
    
    const whereClause: any = { isPublished: true };
    if (search) {
      whereClause.OR = [
        { title: { contains: search, mode: 'insensitive' } },
        { content: { contains: search, mode: 'insensitive' } },
      ];
    }

    const skip = (page - 1) * limit;

    const [data, total] = await Promise.all([
      this.prisma.blog.findMany({
        where: whereClause,
        skip,
        take: limit,
        orderBy: { [sortBy]: sortOrder },
        include: {
          author: {
            select: { firstName: true, lastName: true }
          }
        }
      }),
      this.prisma.blog.count({ where: whereClause })
    ]);

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

  async findOneBySlug(slug: string) {
    const blog = await this.prisma.blog.findUnique({
      where: { slug, isPublished: true },
      include: {
        author: {
          select: { firstName: true, lastName: true }
        }
      }
    });
    
    if (!blog) {
      throw new NotFoundException('مقاله یافت نشد');
    }
    
    return blog;
  }
}