/**
 * CloudFlare Images utility
 * 
 * Provides helper functions to construct CloudFlare Images URLs
 * using the configured CDN domain (cdn.thrillwiki.com)
 */

import { env } from './env';

/**
 * Available image variants for CloudFlare Images
 */
export type ImageVariant = 'public' | 'thumbnail' | 'banner' | 'avatar' | 'og';

/**
 * Get CloudFlare Images URL for a given image ID and variant
 * 
 * @param imageId - CloudFlare image ID
 * @param variant - Image variant (default: 'public')
 * @returns Full CloudFlare CDN URL
 * 
 * @example
 * ```ts
 * const url = getCloudFlareImageUrl('abc123', 'thumbnail');
 * // Returns: https://cdn.thrillwiki.com/images/abc123/thumbnail
 * ```
 */
export function getCloudFlareImageUrl(
  imageId: string,
  variant: ImageVariant = 'public'
): string {
  const baseUrl = env.NEXT_PUBLIC_CLOUDFLARE_IMAGE_URL;
  
  // cdn.thrillwiki.com format: {base_url}/images/{image-id}/{variant-id}
  return `${baseUrl}/images/${imageId}/${variant}`;
}

/**
 * Extract image ID from a CloudFlare Images URL
 * 
 * @param url - CloudFlare Images URL
 * @returns Image ID or null if not a valid CloudFlare URL
 * 
 * @example
 * ```ts
 * const imageId = extractImageId('https://cdn.thrillwiki.com/images/abc123/public');
 * // Returns: 'abc123'
 * ```
 */
export function extractImageId(url: string): string | null {
  try {
    // Pattern for cdn.thrillwiki.com: /images/{id}/{variant}
    const cdnMatch = url.match(/\/images\/([^\/]+)\/[^\/]+$/);
    if (cdnMatch) {
      return cdnMatch[1];
    }
    
    // Pattern for imagedelivery.net: /{hash}/{id}/{variant}
    const deliveryMatch = url.match(/imagedelivery\.net\/[^\/]+\/([^\/]+)\/[^\/]+$/);
    if (deliveryMatch) {
      return deliveryMatch[1];
    }
    
    return null;
  } catch {
    return null;
  }
}

/**
 * Check if a URL is a CloudFlare Images URL
 * 
 * @param url - URL to check
 * @returns true if URL is a CloudFlare Images URL
 */
export function isCloudFlareImageUrl(url: string): boolean {
  return url.includes('cdn.thrillwiki.com/images') || 
         url.includes('imagedelivery.net');
}

/**
 * Get multiple variant URLs for an image
 * 
 * @param imageId - CloudFlare image ID
 * @param variants - Array of variants to generate URLs for
 * @returns Object mapping variant names to URLs
 * 
 * @example
 * ```ts
 * const urls = getImageVariants('abc123', ['public', 'thumbnail']);
 * // Returns: { public: '...', thumbnail: '...' }
 * ```
 */
export function getImageVariants(
  imageId: string,
  variants: ImageVariant[]
): Record<ImageVariant, string> {
  return variants.reduce((acc, variant) => {
    acc[variant] = getCloudFlareImageUrl(imageId, variant);
    return acc;
  }, {} as Record<ImageVariant, string>);
}