import axios from 'axios';

const API_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001';

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

// Add auth token to requests
api.interceptors.request.use((config) => {
  if (typeof window !== 'undefined') {
    const token = localStorage.getItem('accessToken');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
  }
  return config;
});

// Handle token refresh on 401
api.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;

    if (error.response?.status === 401 && !originalRequest._retry && typeof window !== 'undefined') {
      originalRequest._retry = true;

      try {
        const refreshToken = localStorage.getItem('refreshToken');
        if (refreshToken) {
          const response = await axios.post(`${API_URL}/api/auth/refresh`, {
            refreshToken,
          });

          const { accessToken, refreshToken: newRefreshToken } = response.data.data;
          localStorage.setItem('accessToken', accessToken);
          if (newRefreshToken) {
            localStorage.setItem('refreshToken', newRefreshToken);
          }

          originalRequest.headers.Authorization = `Bearer ${accessToken}`;
          return api(originalRequest);
        }
      } catch (refreshError) {
        localStorage.removeItem('accessToken');
        localStorage.removeItem('refreshToken');
        if (typeof window !== 'undefined') {
          window.location.href = '/login';
        }
        return Promise.reject(refreshError);
      }
    }

    return Promise.reject(error);
  }
);

export default api;