import { inject, Injectable } from '@angular/core';
import { Location } from '@angular/common';
import { Router } from '@angular/router';

import { ImageStorage } from './image-storage';
import { ProductDAO } from '../dao/ProductDAO';
import { Product } from '../models/Product';

@Injectable({
  providedIn: 'root',
})
export class ProductSettings {
  private readonly imageStorage = inject(ImageStorage);
  private readonly location = inject(Location);
  private readonly productDAO = inject(ProductDAO);
  private readonly router = inject(Router);

  async save(product: Product, img: File | null) {
    try {
      if (img) {
        const imgFileName = await this.imageStorage.saveImage(img);
        product.image = imgFileName;
      }
      await this.productDAO.insert(product);
    } catch (e) {
      //catch by message starts with SQLITE_CONSTRAINT_UNIQUE is duplicate
      console.error(e)
      //TODO: report problem
    }
    this.router.navigate(['settings', 'products']);
    this.location.replaceState('products');
  }

  async update(prevProd: Product, updatedProd: Product, img: File | null) {
    try {
      let imgName = prevProd.name;
      if (img) {
        if (img.name !== imgName) {
          imgName = await this.imageStorage.saveImage(img);
          if (prevProd.image) {
            this.imageStorage.deleteImage(prevProd.image);
          }
          updatedProd.image = imgName;
        }
      }
      await this.productDAO.update(updatedProd, { id: updatedProd.id });
    } catch (e) {
      console.error(e);
      //TODO: report problem
    }
    this.router.navigate(['settings', 'products']);
    this.location.replaceState('products');
  }
}