import { Injectable } from '@angular/core';
import {
  HttpClient,
  HttpErrorResponse,
  HttpHeaders,
} from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';
import { environment } from 'src/environments/environment';
import { MeterData } from '../dataModels/Meterdata';
import { Meter } from '../dataModels/Meter';

@Injectable({
  providedIn: 'root',
})
export class DatabaseService {
  private baseUrl = environment.apiBaseUrl;

  constructor(private http: HttpClient) {}

  getMeterData(): Observable<MeterData[]> {
    const url = `${this.baseUrl}/meter-data`;
    return this.http.get<MeterData[]>(url).pipe(catchError(this.handleError));
  }

  getMeterDataByType(usageType: string): Observable<MeterData[]> {
    const url = `${this.baseUrl}/meter-data?usageType=${usageType}`;
    return this.http.get<MeterData[]>(url).pipe(catchError(this.handleError));
  }

  addMeterData(meterData: MeterData): Observable<MeterData> {
    const url = `${this.baseUrl}/meter-data`;
    return this.http
      .post<MeterData>(url, meterData)
      .pipe(catchError(this.handleError));
  }

  getMeters(): Observable<Meter[]> {
    const url = `${this.baseUrl}/meters`;
    return this.http.get<Meter[]>(url).pipe(catchError(this.handleError));
  }

  private handleError(error: HttpErrorResponse): Observable<never> {
    // https://stackoverflow.com/questions/68655492/throwerrorerror-is-now-deprecated-but-there-is-no-new-errorhttperrorresponse

    if (error.error instanceof ErrorEvent) {
      // A client-side or network error occurred. Handle it accordingly.
      console.error('An error occurred:', error.error.message);
    } else {
      // The backend returned an unsuccessful response code.
      // The response body may contain clues as to what went wrong.
      console.error(
        `Backend returned code ${error.status}, ` + `body was: ${error.error}`
      );
    }
    // Return an observable with a user-facing error message.
    return throwError(() => error);
  }
}