import { invoke } from "@tauri-apps/api/core";
import { ref } from "vue";

const TOKEN_STORAGE_KEY = "ewa-mobile.authToken";
const authToken = ref(localStorage.getItem(TOKEN_STORAGE_KEY) ?? "");
let restored = false;

interface AuthTokenResponse {
  token: string;
}

export function useAuth() {
  async function login(username: string, password: string) {
    const response = await invoke<AuthTokenResponse>("auth_login", { username, password });
    authToken.value = response.token;
    localStorage.setItem(TOKEN_STORAGE_KEY, response.token);
    restored = true;
  }

  async function logout() {
    authToken.value = "";
    localStorage.removeItem(TOKEN_STORAGE_KEY);
    restored = false;
    await invoke("auth_logout");
  }

  async function restoreToken() {
    if (restored || !authToken.value) {
      return;
    }

    await invoke("auth_set_token", { token: authToken.value });
    restored = true;
  }

  return {
    authToken,
    isAuthenticated,
    login,
    logout,
    restoreToken,
  };
}

export function isAuthenticated() {
  return Boolean(authToken.value);
}