// Axios API client with base URL and auth interceptor.

import axios from 'axios';

const API_BASE_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000/api/v1';

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

// Request interceptor: attach access token
api.interceptors.request.use(
  (config) => {
    const token = localStorage.getItem('access_token');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => Promise.reject(error),
);

// Response interceptor: handle 401 & auto-refresh
api.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;

    // If 401 and not already retried and a refresh token exists
    if (
      error.response?.status === 401 &&
      !originalRequest._retry &&
      localStorage.getItem('refresh_token')
    ) {
      originalRequest._retry = true;

      try {
        const refreshToken = localStorage.getItem('refresh_token');
        const response = await axios.post(`${API_BASE_URL}/auth/refresh`, {
          refresh_token: refreshToken,
        });

        const { access_token, refresh_token: newRefreshToken, user } = response.data;
        localStorage.setItem('access_token', access_token);
        localStorage.setItem('refresh_token', newRefreshToken);
        // Optionally update store
        const { useAuthStore } = await import('../stores/authStore');
        useAuthStore.getState().setUser(user);

        // Retry original request with new token
        originalRequest.headers.Authorization = `Bearer ${access_token}`;
        return api(originalRequest);
      } catch (refreshError) {
        // Refresh failed – logout
        localStorage.removeItem('access_token');
        localStorage.removeItem('refresh_token');
        localStorage.removeItem('user');
        window.location.href = '/login';
        return Promise.reject(refreshError);
      }
    }

    return Promise.reject(error);
  },
);

export default api;