import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../prisma/prisma.service';
import { Product } from '../../prisma/generated/client';
import { ProductCreateInput } from '../../prisma/generated/models/Product';

/** Database access to products. Rows are matched with Hiboutik by `hiboutikId`. */
@Injectable()
export class ProductDatabaseRepository {
  constructor(private readonly prisma: PrismaService) {}

  async getAll(): Promise<Product[]> {
    return this.prisma.product.findMany({
      orderBy: { hiboutikId: 'asc' },
    });
  }

  /** Creates or updates the product with the same `hiboutikId`. On update, the relations missing from the input are unlinked. */
  async upsert(product: ProductCreateInput): Promise<Product> {
    return this.prisma.product.upsert({
      where: { hiboutikId: product.hiboutikId },
      create: product,
      update: {
        ...product,
        // an undefined relation is ignored by Prisma on update: explicitly unlink relations removed in Hiboutik
        brand: product.brand ?? { disconnect: true },
        category: product.category ?? { disconnect: true },
        supplier: product.supplier ?? { disconnect: true },
      },
    });
  }

  /**
   * Deletes products (and their versions, by cascade).
   * Order lines keep their own snapshot of the product, their link is set to null.
   */
  async deleteAll(productIds: string[]): Promise<number> {
    if (productIds.length === 0) return 0;

    const result = await this.prisma.product.deleteMany({
      where: { id: { in: productIds } },
    });
    return result.count;
  }
}