import { Injectable } from '@angular/core';
import { Router } from "@angular/router";
import { HttpClient } from "@angular/common/http";
import 'rxjs/Rx';
import { JwtHelperService } from '@auth0/angular-jwt';

import { environment } from '../../environments/environment';

const TOKEN_LS_NAME = 'token';

@Injectable()
export class AuthService {
    private url = environment.apiUrl + '/api/auth';

    public redirectUrl: string;
    public isLoading: boolean = false;
    public hasError: boolean = false;
    public errorMessage: string = "";

    constructor(private httpService: HttpClient,
                private jwtHelperService: JwtHelperService,
                private router: Router) {
    }

    get token(): string {
        return localStorage.getItem(TOKEN_LS_NAME);
    }

    get isLoggedIn(): boolean {
        try {
            return !this.jwtHelperService.isTokenExpired(this.token);
        } catch (ex) {
            return false;
        }
    }

    get tokenData() {
        return this.jwtHelperService.decodeToken(this.token);
    }

    public authRedirect() {
        this.router.navigate(['/bejelentkezes']);
    }

    public login(login: string, password: string) {
        this.hasError = false;
        this.isLoading = true;
        this.httpService.post<AuthResponse>(this.url + '/login',{
            'login': login,
            'password': password,
        }).subscribe(
            apiResponse => {
                this.isLoading = false;
                if (apiResponse.message == 'login') {
                    localStorage.setItem(TOKEN_LS_NAME, apiResponse.token);
                    this.router.navigate(['/']);
                } else {
                    this.hasError = true;
                    this.errorMessage = "Sikertelen bejelentkezés.";
                }
            },
            err => {
                console.log(err);
                this.hasError = true;
                this.errorMessage = "Hiba történt bejelentkezés közben.";
                this.isLoading = false;
            }
        );
    }

    public renew() {
        this.httpService.get<AuthResponse>(this.url + '/renew')
            .subscribe(
                apiResponse => {
                    if (apiResponse.message == 'renew') {
                        localStorage.setItem(TOKEN_LS_NAME, apiResponse.token);
                    }
                },
                err => console.log(err)
            );
    }

    public logout() {
        localStorage.removeItem(TOKEN_LS_NAME);
    }
}

class AuthResponse {
    public message: string;
    public token: string;
}