import { Injectable } from '@angular/core';
import { User } from '../cookbook/type';

@Injectable({
  providedIn: 'root',
})
export class LoginService {
  async logIn(username: string, password: string): Promise<boolean> {
    const res = await fetch('https://dummyjson.com/user/login', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json',
      },
      body: JSON.stringify({
        username,
        password,
        expiresInMins: 30,
      }),
    });
    if (res.status !== 200) {
      return false;
    }
    const user: User = await res.json();
    localStorage.setItem('user', JSON.stringify(user));
    return true;
  }

  me(): Promise<User | null> {
    const token = this.currentToken();
    if (!token) {
      return Promise.resolve(null);
    }
    return fetch('http://dummyjson.com/user/me', {
      method: 'GET',
      headers: {
        'Authorization': `Bearer ${token}`,
      },
    })
      .then(res => res.json());
  }

  isLoggedIn(): boolean {
    return this.currentToken() !== null;
  }

  currentToken(): string | null {
    const json = localStorage?.getItem('user');
    if (!json) return null;
    return JSON.parse(json).token;
  }

  logOut(): void {
    localStorage?.removeItem('user');
  }
}