import { useState, useEffect } from "react";
import { useNavigate } from "react-router-dom";
import { API_URL } from "../config/authConstants";
import { saveTokens } from "../api/apiClient";

export function useCheckLogin(login) {
  const [checking, setChecking] = useState(false);
  const [exists, setExists] = useState(false);

  useEffect(() => {
    if (!login || login.length < 3) {
      setExists(false);
      return;
    }

    const timer = setTimeout(async () => {
      try {
        setChecking(true);
        const res = await fetch(`${API_URL}/api/v1/auth/check-login?login=${encodeURIComponent(login)}`);
        const json = await res.json();
        setExists(json.exists);
      } catch (e) {
        console.error(e);
      } finally {
        setChecking(false);
      }
    }, 400);

    return () => clearTimeout(timer);
  }, [login]);

  return { checking, exists };
}

export function useRegister() {
  const navigate = useNavigate();
  const [loading, setLoading] = useState(false);
  const [error, setError]     = useState(null);
  const [success, setSuccess] = useState(false);

  const register = async ({ name, login, password }) => {
    setLoading(true);
    setError(null);

    try {
      const res = await fetch(`${API_URL}/api/v1/auth/register`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ name, login, password }),
      });

      const data = await res.json();

      if (!res.ok) {
        throw new Error(data.message || "Ошибка регистрации");
      }

      saveTokens(data.token, data.refreshToken);
      setSuccess(true);
      setTimeout(() => navigate("/feed"), 1500);
    } catch (e) {
      setError(e.message);
    } finally {
      setLoading(false);
    }
  };

  return { register, loading, error, success };
}