/**
 * API utilities for client and server-side requests
 */

/**
 * Normalizes the API URL to ensure it uses the proper prefix
 * For client-side, ensures all requests go through the Next.js API proxy
 */
export function normalizeApiUrl(url: string): string {
  // If URL already starts with http or https, return as is
  if (url.startsWith('http://') || url.startsWith('https://')) {
    return url;
  }
  
  // If URL already starts with /api, use as is
  if (url.startsWith('/api/')) {
    return url;
  }
  
  // Otherwise, ensure it has the /api prefix
  return `/api${url.startsWith('/') ? '' : '/'}${url}`;
}

/**
 * Get the server API URL for server-side requests
 */
export function getServerApiUrl(endpoint: string): string {
  // Get the base API URL from environment
  const baseUrl = process.env.SERVER_API_URL || process.env.NEXT_PUBLIC_API_URL || 'https://internal-api.inboxi.ng/api';
  
  // Ensure it doesn't have trailing slash
  const normalizedBaseUrl = baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl;
  
  // Ensure endpoint has leading slash
  const normalizedEndpoint = endpoint.startsWith('/') ? endpoint : `/${endpoint}`;
  
  return `${normalizedBaseUrl}${normalizedEndpoint}`;
}

/**
 * Get the authentication token from cookies or localStorage
 * Only available in client-side code
 */
export function getAuthToken(): string | null {
  if (typeof document === 'undefined') return null;
  
  return document.cookie
    .split('; ')
    .find(row => row.startsWith('Authorization='))
    ?.split('=')[1] || 
    (typeof localStorage !== 'undefined' ? localStorage.getItem('Authorization') : null);
}

/**
 * Create headers with authentication for API requests
 */
export function createApiHeaders(token: string | null = null, additionalHeaders: Record<string, string> = {}): Headers {
  const headers = new Headers({
    'Content-Type': 'application/json',
    ...additionalHeaders
  });
  
  // Use provided token or try to get it from storage
  const authToken = token || getAuthToken();
  
  if (authToken) {
    headers.append('Authorization', `Bearer ${authToken}`);
  }
  
  return headers;
}