import axios from 'axios';

// Maintenance mode callback
let maintenanceModeCallback: ((enabled: boolean) => void) | null = null;

export const setMaintenanceModeCallback = (callback: (enabled: boolean) => void) => {
  maintenanceModeCallback = callback;
};

// Create axios instance
export const api = axios.create({
  baseURL: import.meta.env.VITE_API_URL || '/api',
  headers: {
    'Content-Type': 'application/json',
  },
  withCredentials: true,
});

// Request interceptor: drop Content-Type for FormData payloads so the browser can set boundaries
api.interceptors.request.use(
  (config) => {
    if (config.data instanceof FormData) {
      delete config.headers?.['Content-Type'];
    }

    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

// Response interceptor to handle errors
api.interceptors.response.use(
  (response) => response,
  (error) => {
    // Handle maintenance mode (503)
    if (error.response?.status === 503) {
      const isAdminRoute = error.config?.url?.includes('/admin');
      
      // Only trigger maintenance mode for non-admin routes or unauthenticated admin routes
      if (!isAdminRoute) {
        if (maintenanceModeCallback) {
          maintenanceModeCallback(true);
        }
      }
    }
    
    if (error.response?.status === 401) {
      // Check if it's an admin route (but not public endpoints)
      const isAdminRoute = error.config?.url?.includes('/admin') && !error.config?.url?.includes('/public/');
      const currentPath = window.location.pathname;
      
      if (isAdminRoute) {
        // Only redirect if we're not already on the admin login page
        if (!currentPath.includes('/admin/login')) {
          window.location.href = '/admin/login';
        }
      } else {
        // For gallery routes, check if the error is from a gallery API call
        const galleryMatch = error.config?.url?.match(/\/gallery\/([^\/]+)/);
        
        // Check if this is an image request (photo or thumbnail)
        const isImageRequest = error.config?.url?.match(/\/(photo|thumbnail)\/\d+$/);
        
        // Don't redirect if we're on any gallery page (to avoid redirect loops during login)
        if (currentPath.startsWith('/gallery/')) {
          // Don't clear tokens for image requests - they might just need a retry
          if (!isImageRequest && galleryMatch && galleryMatch[1]) {
            const gallerySlug = galleryMatch[1];
            sessionStorage.removeItem(`gallery_event_${gallerySlug}`);
          }
          // Don't redirect - let the component handle the auth state
        } else if (galleryMatch) {
          // We're not on a gallery page but got a 401 from a gallery API
          // This shouldn't happen in normal flow, but if it does, redirect to homepage
          window.location.href = '/';
        }
      }
    }

    return Promise.reject(error);
  }
);