brewman/overlord/src/app/raw-material-cost/raw-material-cost.service.ts

import { Injectable } from '@angular/core';
import { catchError } from 'rxjs/operators';
import { Observable } from 'rxjs/internal/Observable';
import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
import { RawMaterialCost } from './raw-material-cost';
import { ErrorLoggerService } from '../core/error-logger.service';

const httpOptions = {
  headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
};

const url = '/api/raw-material-cost';
const serviceName = 'RawMaterialCostService';

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

  list(id: string, startDate: string, finishDate): Observable<RawMaterialCost> {
    const options = { params: new HttpParams() };
    if (startDate !== null) {
      options.params = options.params.set('s', startDate);
    }
    if (finishDate !== null) {
      options.params = options.params.set('f', finishDate);
    }
    const listUrl = id === null ? (startDate || finishDate ? `${url}/data` : url) : `${url}/${id}`;
    return <Observable<RawMaterialCost>>(
      this.http
        .get<RawMaterialCost>(listUrl, options)
        .pipe(catchError(this.log.handleError(serviceName, 'list')))
    );
  }
}