import { HttpClient, HttpParams } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/internal/Observable';
import { catchError } from 'rxjs/operators';

import { ErrorLoggerService } from '../core/error-logger.service';
import { Product } from '../core/product';
import { ProductSku } from '../core/product-sku';

const url = '/api/products';
const serviceName = 'ProductService';

@Injectable({ providedIn: 'root' })
export class ProductService {
  constructor(
    private http: HttpClient,
    private log: ErrorLoggerService,
  ) {}

  get(id: string | null): Observable<Product> {
    const getUrl: string = id === null ? `${url}` : `${url}/${id}`;
    return this.http
      .get<Product>(getUrl)
      .pipe(catchError(this.log.handleError(serviceName, `get id=${id}`))) as Observable<Product>;
  }

  list(): Observable<Product[]> {
    return this.http
      .get<Product[]>(`${url}/list`)
      .pipe(catchError(this.log.handleError(serviceName, 'getList'))) as Observable<Product[]>;
  }

  save(product: Product): Observable<Product> {
    return this.http
      .post<Product>(`${url}`, product)
      .pipe(catchError(this.log.handleError(serviceName, 'save'))) as Observable<Product>;
  }

  update(product: Product): Observable<Product> {
    return this.http
      .put<Product>(`${url}/${product.id}`, product)
      .pipe(catchError(this.log.handleError(serviceName, 'update'))) as Observable<Product>;
  }

  saveOrUpdate(product: Product): Observable<Product> {
    if (!product.id) {
      return this.save(product);
    }
    return this.update(product);
  }

  delete(id: string): Observable<Product> {
    return this.http
      .delete<Product>(`${url}/${id}`)
      .pipe(catchError(this.log.handleError(serviceName, 'delete'))) as Observable<Product>;
  }

  autocompleteProduct(query: string, isPurchased: boolean | null): Observable<ProductSku[]> {
    const options = {
      params: new HttpParams().set('q', query),
    };
    if (isPurchased !== null) {
      options.params = options.params.set('p', isPurchased.toString());
    }
    return this.http
      .get<ProductSku[]>(`${url}/q-product`, options)
      .pipe(catchError(this.log.handleError(serviceName, 'autocomplete'))) as Observable<ProductSku[]>;
  }

  autocompleteSku(
    query: string,
    isPurchased: boolean | null,
    date?: string,
    vendorId?: string,
  ): Observable<ProductSku[]> {
    const options = {
      params: new HttpParams().set('q', query),
    };
    if (isPurchased !== null) {
      options.params = options.params.set('p', isPurchased.toString());
    }
    if (!!vendorId && !!date) {
      options.params = options.params.set('v', vendorId as string).set('d', date as string);
    }
    return this.http
      .get<ProductSku[]>(`${url}/q-sku`, options)
      .pipe(catchError(this.log.handleError(serviceName, 'autocomplete'))) as Observable<ProductSku[]>;
  }
}