import axios from 'axios';
import AsyncStorage from '@react-native-async-storage/async-storage';

const API_BASE_URL = process.env.EXPO_PUBLIC_API_URL || 'https://mobile.voltechgroup.com/api';

const api = axios.create({
  baseURL: API_BASE_URL,
  timeout: 15000,
  headers: {
    'Content-Type': 'application/json',
  },
});

let onUnauthorized: (() => void) | null = null;

export function setOnUnauthorized(handler: () => void) {
  onUnauthorized = handler;
}

api.interceptors.request.use(
  async (config) => {
    const token = await AsyncStorage.getItem('auth_token');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => Promise.reject(error)
);

let isRefreshing = false;

api.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;

    if (error.response?.status === 401 && !originalRequest._retry) {
      if (isRefreshing) return Promise.reject(error);
      isRefreshing = true;
      originalRequest._retry = true;

      try {
        await AsyncStorage.removeItem('auth_token');
        delete api.defaults.headers.common['Authorization'];
      } catch {
        // silent
      } finally {
        isRefreshing = false;
      }

      if (onUnauthorized) {
        onUnauthorized();
      }
    }
    return Promise.reject(error);
  }
);

export default api;