import {Injectable} from '@angular/core';
import {HttpRequest, HttpHandler, HttpEvent, HttpInterceptor} from '@angular/common/http';
import {Observable} from 'rxjs';

import {AuthService} from '../auth/auth.service';

@Injectable()
export class JwtInterceptor implements HttpInterceptor {
  private isRefreshing = false;

  constructor(private authService: AuthService) {
  }

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // add authorization header with jwt token if available

    // We use this line to debug token refreshing
    // console.log("intercepting:\nisRefreshing: ", this.isRefreshing, "\n user: ", this.authService.user,"\n needsRefreshing: ", this.authService.needsRefreshing());
    if (!this.isRefreshing && this.authService.user && this.authService.needsRefreshing()) {
      this.isRefreshing = true;
      this.authService.refreshToken().subscribe( x => this.isRefreshing = false);
    }
    const currentUser = this.authService.user;
    if (currentUser?.access_token) {
      request = request.clone({
        setHeaders: {
          Authorization: `Bearer ${currentUser.access_token}`
        }
      });
    }


    return next.handle(request);
  }
}