import {Injectable} from '@angular/core';
import {
  HttpErrorResponse,
  HttpEvent,
  HttpHandler,
  HttpInterceptor,
  HttpRequest,
  // HttpResponse,
  // HttpClient,
} from '@angular/common/http';
import {
  NbComponentStatus,
 } from '@nebular/theme';
import {Observable, of, throwError} from 'rxjs';
import {catchError,
  // filter,
  // map,
} from 'rxjs/internal/operators';
import {Router} from '@angular/router';
import { environment } from '../../environments/environment';

import { MessageToasterService } from '../services/message-toaster.service';

@Injectable({
  providedIn: 'root',
})

export class CommonInterceptorService implements HttpInterceptor {
  environment: any = environment;

  constructor(
    private router: Router, private toasterService: MessageToasterService,
    ) { }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    let secureReq = req.clone();
    if (req.body) {
      secureReq = req.clone({
        body: req.body,
      });
      // secureReq.body.err = 'hello error!';
    }

    if (!secureReq.url.startsWith('http') && !secureReq.url.endsWith('environment.prod.json')) {
      let url = secureReq.url;
      if (!url.startsWith('/')) {
        url = '/' + url;
      }

      secureReq = secureReq.clone({
        url: this.environment.apiHost + url,
      });
    }

    return next.handle(secureReq).pipe(
      catchError((err: HttpErrorResponse) => this.handleError(err)),
      );
  }

  private handleError(
    event: HttpErrorResponse,
  ): Observable<any> {
    let message = '';
    let errorRes = null;
    let errorType = '';
    let cssType: NbComponentStatus ;
    switch (event.status) {
      case 400:
        message = event.error.errorInfo.message;
        errorType = 'Business Error';
        cssType = 'warning';
        if (event.error.errorDetail !== null) {
          message += '\n' + event.error.errorDetail;
        }
        errorRes = of(event);
        break;
      case 401:
        message = 'not login';
        errorType = 'Business Error';
        cssType = 'warning';
        this.router.navigate(['/']);
        errorRes = of(event) ;
        break;
      case 504:
        message = 'there some error was happend on server.';
        errorType = 'System Error';
        cssType = 'danger';
        this.router.navigate(['/']);
        errorRes = of(event) ;
        break;
      default:
        errorRes = throwError(event) ;
        break;
    }

    this.toasterService.makeToast(errorType, message, cssType, 5000);
    return errorRes;
  }

}