import { DiscordUser } from '../types';

// Points to the production backend via Traefik
const API_URL = 'https://vollidioten.ceraticsoft.de';

class AuthService {
  private user: DiscordUser | null = null;
  private listeners: ((user: DiscordUser | null) => void)[] = [];

  constructor() {
    this.checkSession();
  }

  getUser(): DiscordUser | null {
    return this.user;
  }

  // Check if session cookie exists and is valid
  async checkSession() {
    try {
        const res = await fetch(`${API_URL}/auth/me`, { credentials: 'include' });
        if (res.ok) {
            const data = await res.json();
            this.user = data;
            this.notifyListeners();
        }
    } catch (e) {
        console.log("Auth check failed (Backend might be offline)", e);
    }
  }

  // Redirects to Discord OAuth
  async login(): Promise<void> {
     window.location.href = `${API_URL}/auth/discord`;
  }

  logout() {
     window.location.href = `${API_URL}/auth/logout`;
  }

  subscribe(listener: (user: DiscordUser | null) => void) {
    this.listeners.push(listener);
    listener(this.user);
    return () => {
      this.listeners = this.listeners.filter(l => l !== listener);
    };
  }

  private notifyListeners() {
    this.listeners.forEach(l => l(this.user));
  }
}

export const authService = new AuthService();