// vim: set tw=80 ts=2 sw=2 sts=2 :

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

import { Observable} from 'rxjs/Rx';
import 'rxjs/add/operator/map';

import { Logger } from '@nsalaun/ng-logger';

import { LoginService } from './login.service';

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  constructor(
    private logger: Logger,
    private loginService: LoginService,
  ) {}

  intercept(
    req: HttpRequest<any>,
    next: HttpHandler
  ): Observable<HttpEvent<any>> {
    this.logger.log('Intercepted request', req, next);

    if(!req.headers.has('Authorization')) {
      let accessToken: string = this.loginService.accessToken();

      if(accessToken){
        req = req.clone({
          headers: req.headers.set('Authorization', `Bearer ${accessToken}`)
        });
      }
    }

    this.logger.log('Request', req);

    return next.handle(req).map(
      (event: HttpEvent<any>) => event,
      (error) => {
        if(error instanceof HttpErrorResponse && error.status === 401) {
          this.logger.error('Unauthorized', error);
        }
      }
    );
  }
}