const gatewayBase = (process.env.NEXT_PUBLIC_API_URL || process.env.PUBLIC_API_URL || 'http://localhost:3005/api').replace(/\/+$/, '');

export function gatewayUrl(path: string) {
  const normalized = path.startsWith('/') ? path : `/${path}`;
  if (gatewayBase.endsWith('/api')) {
    if (normalized === '/api') return gatewayBase;
    if (normalized.startsWith('/api/')) {
      return `${gatewayBase}${normalized.slice(4)}`;
    }
  }
  return `${gatewayBase}${normalized}`;
}

export function readAccessTokenFromRequest(request: Request): string | null {
  const cookie = request.headers.get('cookie') || '';
  if (!cookie) return null;

  const parts = cookie.split(';').map((part) => part.trim());
  const pair = parts.find((part) => part.startsWith('nxtgauge_access_token='));
  if (!pair) return null;

  const token = pair.split('=').slice(1).join('=').trim();
  if (!token) return null;

  try {
    return decodeURIComponent(token);
  } catch {
    return token;
  }
}

export function withAuthHeaders(request: Request, extra?: Record<string, string>) {
  const token = readAccessTokenFromRequest(request);
  const headers: Record<string, string> = { ...(extra || {}) };
  if (token) headers.Authorization = `Bearer ${token}`;
  return headers;
}

// Alias for forwardAuth (used in some API endpoints)
export const forwardAuth = withAuthHeaders;

// Forward cookies from request
export function forwardCookies(request: Request): Record<string, string> {
  const cookie = request.headers.get('cookie');
  if (!cookie) return {};
  return { cookie };
}