import axios from 'axios';

// Replace with your actual HF Space backend URL
const API_BASE_URL = process.env.REACT_APP_API_URL || 'https://humblebeeai-al-ghazali-rag-retrieval-api.hf.space';

const api = axios.create({
  baseURL: API_BASE_URL,
  headers: {
    'Content-Type': 'application/json',
  },
});

// Helper to get tokens from localStorage
function getAuthTokens() {
  const tokens = localStorage.getItem('authTokens');
  return tokens ? JSON.parse(tokens) : null;
}

// Request interceptor to add auth token
api.interceptors.request.use(
  (config) => {
    const tokens = getAuthTokens();
    if (tokens?.access) {
      config.headers['Authorization'] = `Bearer ${tokens.access}`;
    }
    return config;
  },
  (error) => Promise.reject(error)
);

// Response interceptor to handle token refresh
api.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;

    if (error.response && error.response.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true;

      try {
        const tokens = getAuthTokens();
        if (!tokens?.refresh) throw new Error('No refresh token');

        const response = await axios.post(`${API_BASE_URL}/refresh`, {
          refresh_token: tokens.refresh
        });

        const newTokens = {
          access: response.data.access_token,
          refresh: response.data.refresh_token
        };
        localStorage.setItem('authTokens', JSON.stringify(newTokens));

        originalRequest.headers['Authorization'] = `Bearer ${newTokens.access}`;
        return api(originalRequest);
      } catch (refreshError) {
        localStorage.removeItem('authTokens');
        window.location.href = '/';
        return Promise.reject(refreshError);
      }
    }

    return Promise.reject(error);
  }
);

export default api;