import { Injectable } from '@angular/core';
import {JwtHelper} from 'angular2-jwt';

@Injectable()
export class AuthService {

  tokenKey = 'loginToken';

  constructor(public jwtHelper: JwtHelper) {}

  public setToken(token): boolean {
    if (token) {
      if (!this.jwtHelper.isTokenExpired(token)) {
        sessionStorage.setItem(this.tokenKey, token);
        return true;
      }
    }
    return false;
  }

  public deleteToken(): void {
    sessionStorage.removeItem(this.tokenKey);
    sessionStorage.removeItem('nonce');
  }

  public getToken(): string {
    return sessionStorage.getItem(this.tokenKey);
  }

  // Check whether the token is expired and return
  // true or false
  public isAuthenticated(): boolean {
    const token = sessionStorage.getItem(this.tokenKey);
    if (token) {
      return !this.jwtHelper.isTokenExpired(token);
    } else {
      return false;
    }
  }
}