import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../prisma/prisma.service';
import { Prisma, ProductVersion } from '../../prisma/generated/client';
import { ProductVersionCreateInput } from '../../prisma/generated/models/ProductVersion';

/** Database access to product versions (one per Hiboutik size), identified by their product and `hiboutikSizeId`. */
@Injectable()
export class ProductVersionDatabaseRepository {
  constructor(private readonly prisma: PrismaService) {}

  async getAll(): Promise<ProductVersion[]> {
    return this.prisma.productVersion.findMany({
      orderBy: { hiboutikSizeId: 'asc' },
    });
  }

  /**
   * Creates or updates the version of `productId` with the same `hiboutikSizeId`.
   * @param db transaction client, to run it inside a transaction.
   */
  async upsert(
    productId: string,
    productVersion: ProductVersionCreateInput,
    db: Prisma.TransactionClient = this.prisma,
  ): Promise<ProductVersion> {
    return db.productVersion.upsert({
      where: { productId_hiboutikSizeId: { productId: productId, hiboutikSizeId: productVersion.hiboutikSizeId } },
      create: productVersion,
      update: productVersion,
    });
  }

  /**
   * Deletes the versions of a product that no longer exist in Hiboutik.
   * Order lines keep their own snapshot of the product, their link is set to null.
   * @param db transaction client, to run it inside a transaction.
   */
  async deleteMissing(productId: string, keptHiboutikSizeIds: number[], db: Prisma.TransactionClient = this.prisma): Promise<number> {
    const result = await db.productVersion.deleteMany({
      where: { productId, hiboutikSizeId: { notIn: keptHiboutikSizeIds } },
    });
    return result.count;
  }
}