import {Injectable} from "@angular/core";
import {HttpEvent, HttpHandler, HttpInterceptor, HttpRequest} from "@angular/common/http";
import {Observable, throwError} from "rxjs";
import {catchError} from "rxjs/operators";
import {Session} from "./login/utils/helper.class";
import {Router} from "@angular/router";
import {LoginErrorCodes} from "./login/utils/guardHelper.class";
import {properties} from "../../environments/environment";
import {isArray} from "util";

@Injectable()
export class ErrorInterceptorService implements HttpInterceptor {
  
  private static UNAUTHORIZED_WHITELIST = [properties.userInfoUrl, properties.orcidAPIURL];
  
  constructor(private router: Router) {
  }
  
  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(req).pipe(catchError(err => {
      if ((err.status === 0 && this.isService(req, properties.registryUrl)) ||
        (err.status === 401 && !this.isService(req, ErrorInterceptorService.UNAUTHORIZED_WHITELIST))) {
        this.logOut();
      } else if(err.status === 403) {
        this.unauthorized();
      }
      return throwError(err);
    }));
  }
  
  isService(req: HttpRequest<any>, service: string | string[]):boolean {
    if(isArray(service)) {
      return !!service.find(element => req.url.indexOf(element) !== -1);
    } else {
      return req.url.indexOf(service) !== -1;
    }
  }
  
  logOut() {
    Session.removeUser();
    this.router.navigate(['/user-info'], {
      queryParams: {
        'errorCode': LoginErrorCodes.NOT_LOGIN,
        'redirectUrl': this.router.url
      }
    });
  }
  
  unauthorized() {
    this.router.navigate(['/user-info'], {
      queryParams: {
        'errorCode': LoginErrorCodes.NOT_AUTHORIZED,
        'redirectUrl': this.router.url
      }
    });
  }
}