import { Injectable } from '@angular/core';
import {TokenResponse} from "../interface/auth";
import moment from "moment";
import {HttpClient} from "@angular/common/http";
import {tap} from "rxjs";

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

  private apiUrl = 'http://localhost:8080/api/';

  constructor(
    private httpClient: HttpClient
  ) {

  }

  public register(email: string, username: string, password: string) {

    const body = {
      email: email,
      username: username,
      password: password
    }
    return this.httpClient.post(this.apiUrl + 'v1/auth/register', body);
  }

  public authenticate(email: string, password: string) {

    const body = {
      email: email,
      password: password
    }

    return this.httpClient.post<TokenResponse>(this.apiUrl + 'v1/auth/login', body)
      .pipe(tap(token => {this.setSession(token)}));
  }

  private setSession(res: TokenResponse) {
    const expiresAt = moment().add(res.expiresIn, 'milliseconds');

    localStorage.setItem('tokenId', res.token);
    localStorage.setItem("expiresAt", JSON.stringify(expiresAt.valueOf()) );
  }


  public logout() {
    localStorage.removeItem("tokenId");
    localStorage.removeItem("expiresAt");
  }

  public isLoggedIn() {
    return moment().isBefore(this.getExpiration());
  }

  isLoggedOut() {
    return !this.isLoggedIn();
  }

  getExpiration() {
    const expiration = localStorage.getItem("expiresAt");
    const expiresAt = JSON.parse(expiration ? expiration : '{}');
    return moment(expiresAt);
  }
}