import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor, HttpErrorResponse } from '@angular/common/http';
import { Inject, Injectable } from '@angular/core';
import { Observable, from } from '{{&observableImport}}';
import {REST_AUTH_TOKEN, RestAuthService} from './rest-auth-service';
import {REST_TOKEN_TOKEN, RestTokenService} from './rest-token-service';

@Injectable()
export class JWTInterceptor implements HttpInterceptor {

  constructor(@Inject(REST_AUTH_TOKEN) private _authService: RestAuthService,
              @Inject(REST_TOKEN_TOKEN) private _tokenService: RestTokenService) { }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return from(this.handle(req, next));
  }

  async handle(req: HttpRequest<any>, next: HttpHandler): Promise<HttpEvent<any>> {
    try {
      await this._authService.silentRefresh(req);

      const token = this._tokenService.token();

      if (token) {
        req = req.clone({
          setHeaders: {authorization: 'Bearer ' + token}
        });
      }

    } catch (e) {
      console.log('JWTInterceptor had an error');
      console.log(e);
    }

    // always attempt the API, potentially w/o the authorization header:
    return next.handle(req).toPromise();
  }


}