import { useState } from "react";
import { useNavigate } from "react-router-dom";
import { API_URL } from "../config/constants";

export function useAuth() {
  const navigate = useNavigate();
  const [loading, setLoading] = useState(false);
  const [error,   setError]   = useState("");

  const login = async (email, password) => {
    if (!email || !password) { setError("Введи email и пароль"); return; }
    setLoading(true); setError("");

    try {
      const res = await fetch(`${API_URL}/api/auth/login`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password }),
      });

      if (!res.ok) {
        const data = await res.json().catch(() => ({}));
        throw new Error(data.message || "Неверный email или пароль");
      }

      const { token, user } = await res.json();
      localStorage.setItem("token", token);
      localStorage.setItem("user",  JSON.stringify(user));
      navigate("/dashboard");
    } catch (err) {
      setError(err.message);
    } finally {
      setLoading(false);
    }
  };

  const loginGoogle  = () => { /* TODO: @react-oauth/google */ };

  const loginYandex  = () => {
    const clientId = process.env.REACT_APP_YANDEX_CLIENT_ID;
    const redirect = encodeURIComponent(`${window.location.origin}/auth/yandex`);
    window.location.href =
        `https://oauth.yandex.ru/authorize?response_type=code&client_id=${clientId}&redirect_uri=${redirect}`;
  };

  const loginVK = () => {
    const appId    = process.env.REACT_APP_VK_APP_ID;
    const redirect = encodeURIComponent(`${window.location.origin}/auth/vk`);
    window.location.href =
        `https://oauth.vk.com/authorize?client_id=${appId}&redirect_uri=${redirect}&response_type=code&scope=email`;
  };

  return { login, loginGoogle, loginYandex, loginVK, loading, error };
}