export interface TenantResolveQueryInput {
  host?: string;
  tenantCode?: string;
}

function normalizedHostname(value: string) {
  const raw = value.trim();
  if (!raw) return '';
  try {
    return new URL(`http://${raw}`).hostname.toLowerCase().replace(/^\[|\]$/g, '').replace(/\.$/, '');
  } catch {
    return '';
  }
}

export function isLocalRuntimeHost(value: string) {
  const hostname = normalizedHostname(value);
  return hostname === 'localhost'
    || hostname.endsWith('.localhost')
    || hostname === '::1'
    || hostname === '0.0.0.0'
    || /^127(?:\.\d{1,3}){3}$/.test(hostname);
}

export function tenantResolveQuery(input: TenantResolveQueryInput) {
  const host = input.host?.trim() || '';
  const tenantCode = input.tenantCode?.trim() || '';
  return {
    host: host || undefined,
    tenantCode: !host || isLocalRuntimeHost(host) ? (tenantCode || undefined) : undefined,
  };
}