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

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

  async findAll(params: {
    skip?: number;
    take?: number;
    where?: Prisma.ProductWhereInput;
    orderBy?: Prisma.ProductOrderByWithRelationInput;
  }): Promise<{ data: Product[]; total: number }> {
    const { skip, take, where, orderBy } = params;
    const [data, total] = await this.prisma.$transaction([
      this.prisma.product.findMany({ 
        skip, 
        take, 
        where, 
        orderBy,
        include: {
          productType: true,
          parent: true,
        },
      }),
      this.prisma.product.count({ where }),
    ]);
    return { data, total };
  }

  async findOne(where: Prisma.ProductWhereUniqueInput): Promise<Product | null> {
    return this.prisma.product.findUnique({ 
      where,
      include: {
        productType: true,
        parent: true,
      },
    });
  }

  async create(data: Prisma.ProductCreateInput): Promise<Product> {
    return this.prisma.product.create({ 
      data,
      include: {
        productType: true,
        parent: true,
      },
    });
  }

  async update(params: {
    where: Prisma.ProductWhereUniqueInput;
    data: Prisma.ProductUpdateInput;
  }): Promise<Product> {
    return this.prisma.product.update({
      ...params,
      include: {
        productType: true,
        parent: true,
      },
    });
  }

  async remove(where: Prisma.ProductWhereUniqueInput): Promise<Product> {
    return this.prisma.product.delete({ 
      where,
      include: {
        productType: true,
        parent: true,
      },
    });
  }
}