Sky.Net/client/src/app/shop/shop.service.ts

import { HttpClient, HttpParams } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { IBrand } from '../shared/models/brand';
import { IPagination } from '../shared/models/pagination';
import { IType } from '../shared/models/producttype';
import { map } from 'rxjs/operators'
import { ShopParams } from '../shared/models/shopparams';

@Injectable({
  providedIn: 'root'
})
export class ShopService {
  baseURL = 'https://localhost:5001/api/'

  constructor(private http: HttpClient) { }

  getProducts(shopParams: ShopParams){
    let params = new HttpParams();

    if (shopParams.brandId !== 0){
      params = params.append('brandId', shopParams.brandId.toString());
    }

    if(shopParams.typeId !== 0){
      params = params.append('typeId', shopParams.typeId.toString());
    }

    if (shopParams.search){
      params = params.append('search', shopParams.search);
    }

    params = params.append('sort', shopParams.sort);
    params = params.append('pageIndex', shopParams.pageNumber.toString());
    params = params.append('pageIndex', shopParams.pageSize.toString());

    return this.http.get<IPagination>(this.baseURL + 'products', {observe: 'response', params})
      .pipe(
        map(response => {
          return response.body;
        })
      );
  }

  getBrands(){
    return this.http.get<IBrand[]>(this.baseURL + 'products/brands');
  }

  getTypes(){
    return this.http.get<IType[]>(this.baseURL + 'products/types');
  }
}