/**
 * File Access Utility
 * Phase 5: Sites Renderer & Publishing
 * 
 * Integrates with Phase 3's SiteBuilderFileService for file access.
 * Provides utilities to access site assets (images, documents, media).
 */

const SITES_DATA_PATH = import.meta.env.SITES_DATA_PATH || '/sites';

/**
 * Get API base URL - auto-detect based on current origin
 */
function getApiBaseUrl(): string {
  const envUrl = import.meta.env.VITE_API_URL;
  if (envUrl) {
    return envUrl.endsWith('/api') ? envUrl : `${envUrl}/api`;
  }
  
  if (typeof window !== 'undefined') {
    const origin = window.location.origin;
    if (/^\d+\.\d+\.\d+\.\d+/.test(origin) || origin.includes('localhost') || origin.includes('127.0.0.1')) {
      if (origin.includes(':8024')) {
        return origin.replace(':8024', ':8011') + '/api';
      }
      return origin.split(':')[0] + ':8011/api';
    }
  }
  
  return 'https://api.igny8.com/api';
}

const API_URL = getApiBaseUrl();

/**
 * Get file URL for a site asset.
 * 
 * @param siteId - Site ID
 * @param version - Site version (optional, defaults to 'latest')
 * @param filePath - Relative path to file from assets directory
 * @returns Full URL to the asset
 */
export function getSiteAssetUrl(
  siteId: string | number,
  filePath: string,
  version: string | number = 'latest'
): string {
  // Try filesystem first (for deployed sites)
  const fsPath = `${SITES_DATA_PATH}/clients/${siteId}/v${version}/assets/${filePath}`;
  
  // In browser, we need to use API endpoint
  // The backend will serve files from the filesystem
  return `${API_URL}/v1/site-builder/assets/${siteId}/${version}/${filePath}`;
}

/**
 * Get image URL for a site.
 */
export function getSiteImageUrl(
  siteId: string | number,
  imagePath: string,
  version: string | number = 'latest'
): string {
  return getSiteAssetUrl(siteId, `images/${imagePath}`, version);
}

/**
 * Get document URL for a site.
 */
export function getSiteDocumentUrl(
  siteId: string | number,
  documentPath: string,
  version: string | number = 'latest'
): string {
  return getSiteAssetUrl(siteId, `documents/${documentPath}`, version);
}

/**
 * Get media URL for a site.
 */
export function getSiteMediaUrl(
  siteId: string | number,
  mediaPath: string,
  version: string | number = 'latest'
): string {
  return getSiteAssetUrl(siteId, `media/${mediaPath}`, version);
}

/**
 * Check if a file exists.
 * 
 * @param siteId - Site ID
 * @param filePath - Relative path to file
 * @param version - Site version
 * @returns Promise that resolves to true if file exists
 */
export async function fileExists(
  siteId: string | number,
  filePath: string,
  version: string | number = 'latest'
): Promise<boolean> {
  try {
    const url = getSiteAssetUrl(siteId, filePath, version);
    const response = await fetch(url, { method: 'HEAD' });
    return response.ok;
  } catch {
    return false;
  }
}

/**
 * Load file content as text.
 */
export async function loadFileAsText(
  siteId: string | number,
  filePath: string,
  version: string | number = 'latest'
): Promise<string> {
  const url = getSiteAssetUrl(siteId, filePath, version);
  const response = await fetch(url);
  if (!response.ok) {
    throw new Error(`Failed to load file: ${filePath}`);
  }
  return response.text();
}

/**
 * Load file content as blob.
 */
export async function loadFileAsBlob(
  siteId: string | number,
  filePath: string,
  version: string | number = 'latest'
): Promise<Blob> {
  const url = getSiteAssetUrl(siteId, filePath, version);
  const response = await fetch(url);
  if (!response.ok) {
    throw new Error(`Failed to load file: ${filePath}`);
  }
  return response.blob();
}