import axios from 'axios';
import { API_URL } from '../../constants';

// Create axios instance
const apiClient = axios.create({
  baseURL: API_URL,
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  },
});

// Request interceptor - Add auth token
apiClient.interceptors.request.use(
  (config) => {
    const tokenData = window.localStorage.getItem('token');
    if (tokenData) {
      try {
        const user = JSON.parse(tokenData);
        if (user?.token) {
          config.headers.Authorization = `Bearer ${user.token}`;
        }
      } catch (error) {
        console.error('Error parsing token:', error);
      }
    }
    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

// Response interceptor - Handle errors globally
apiClient.interceptors.response.use(
  (response) => {
    // Handle different response structures from the API
    // Some endpoints return { data: [...] }, some return plain arrays
    return response;
  },
  (error) => {
    if (error.response) {
      // The request was made and the server responded with a status code
      // that falls out of the range of 2xx
      const { status, data } = error.response;

      if (status === 401) {
        // Unauthorized - redirect to login
        window.localStorage.removeItem('token');
        window.location.href = '/login';
        return Promise.reject(new Error('You are not authorized to access this page.'));
      }

      if (status === 403) {
        return Promise.reject(new Error('You do not have permission to perform this action.'));
      }

      if (status === 404) {
        return Promise.reject(new Error('The requested resource was not found.'));
      }

      if (status === 500) {
        return Promise.reject(new Error('A server error occurred. Please try again later.'));
      }

      // Extract error message from response
      const message = data?.message || data?.Message || data?.error || 'An error occurred';
      return Promise.reject(new Error(message));
    } else if (error.request) {
      // The request was made but no response was received
      return Promise.reject(new Error('No response from server. Please check your connection.'));
    } else {
      // Something happened in setting up the request that triggered an Error
      return Promise.reject(error);
    }
  }
);

export default apiClient;