import { Core, Data } from "@strapi/strapi";
import { Cart } from "../common/types/cart";
import { PrintboxProject } from "src/api/project/common/types/project";
import { BookTypeService } from "src/api/book-type/services/book-type";
import { BookSizeService } from "src/api/book-size/services/book-size";
import { PaperFinishService } from "src/api/paper-finish/services/paper-finish";

export class CartService {
  constructor(private readonly strapi: Core.Strapi) {}

  public transform(cart: Cart) {
    const cartPrice = cart.orderedProjects?.reduce((acc, orderedProject) => acc + orderedProject.project.priceDiscounted * orderedProject.quantity, 0);
    const cartPriceDiscounted = cart.orderedProjects?.reduce((acc, orderedProject) => acc + orderedProject.project.price * orderedProject.quantity, 0);
    return {
      ...cart,
      cartPrice,
      cartPriceDiscounted,
    }
  }

  public async findOrCreate(userId: number): Promise<Cart & { cartPrice: number; cartPriceDiscounted: number }> {
    let cart = await this.strapi.db.query('api::cart.cart').findOne({
      where: { user: userId },
      populate: {
        orderedProjects: {
          populate: {
            project: {
              populate: {
                bookType: true,
                bookSize: true,
                paperFinish: true,
              }
            }
          }
        },
        orderAdditives: true,
      }
    });

    if (!cart) {
      cart = await this.strapi.db.query('api::cart.cart').create({
        data: {
          user: userId,
        },
        populate: {
          project: {
            populate: {
              bookType: true,
              bookSize: true,
              paperFinish: true,
            }
          }
        }
      });
    }

    return this.transform(cart);
  }

  public async appendOrderedProject(cartId: Data.ID, orderedProjectId: Data.ID[]) {
    await this.strapi.db.query('api::cart.cart').update({
      where: { id: cartId },
      data: {
        orderedProjects: {
          connect: orderedProjectId,
        }
      }
    })
  }

  public async getBookAttributes(projectData: PrintboxProject) {
    const bookTypeService = new BookTypeService(strapi);
    const bookSizeService = new BookSizeService(strapi);
    const paperFinishService = new PaperFinishService(strapi);

    const bookType = await bookSizeService.findByPrintboxIds(projectData.params[0].attribute_values_ids);
    const bookSize = await bookTypeService.findByPrintboxIds(projectData.params[0].attribute_values_ids);
    const paperFinish = await paperFinishService.findByPrintboxIds(projectData.params[0].attribute_values_ids);

    return { bookType, bookSize, paperFinish };
  }
}

• [F] cart.ts
  Delete