authentication.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Router } from '@angular/router';
import jwtDecode from 'jwt-decode';
import { User } from '../Types/types';

@Injectable({
  providedIn: 'root'
})
export class AuthenticationService {

  constructor(
    private http: HttpClient,
    private router: Router) { }


  login(username:string, password:string): void {

    const body = {
      username, password
    }

    const headers = new Headers({
        'Content-Type': 'application/json'
      });

    this.http.post('http://0.0.0.0:30992/API/v1/login', body, {observe: 'response'})
    .subscribe(res => {
      if(res.ok) {
        
        localStorage.setItem("token", res.body.toString());
        this.router.navigateByUrl("/");
      }
      else {
        // sheeeeeeeesh
      }
    }); 
  }
  
  isLoggedIn(): Boolean {
    return localStorage.getItem("token") !== null;
  }

  logout(): void {
    localStorage.removeItem("token");
    this.router.navigateByUrl("/");
  }

  private getDecodedAccessToken(): User {
    try {
      return jwtDecode(localStorage.getItem("token")) as User;
    } catch(Error) {
      return null;
    }
  }

  isAdmin(): Boolean {
    const user = this.getDecodedAccessToken() as User;
    
    if (user === null)
      return false;
    return user.type === 'admin';
  }

  getUsername(): string {
    const user = this.getDecodedAccessToken() as User;

    if(user === null)
      return "Guest";
    return user.username;
  }

}