const COMPANY_ID_QUERY_KEYS = [
  'blt-gtw-fc-cid',
];
const COMPANY_ID_STORAGE_KEY = 'sms_runtime_company_id';
const EXTENSION_ID_STORAGE_KEY = 'sms_runtime_extension_id';

function getRuntimeUrl() {
  if (typeof window === 'undefined') return null;

  try {
    return new URL(window.location.href);
  } catch {
    return null;
  }
}

function getReferrerUrl() {
  if (typeof document === 'undefined' || !document.referrer) return null;

  try {
    return new URL(document.referrer);
  } catch {
    return null;
  }
}

function getPathMatch(pathname, regex) {
  const match = pathname.match(regex);
  return match?.[1] || '';
}

function readStoredCompanyId() {
  if (typeof sessionStorage === 'undefined') return '';

  try {
    return (sessionStorage.getItem(COMPANY_ID_STORAGE_KEY) || '').trim();
  } catch {
    return '';
  }
}

function persistCompanyId(companyId) {
  if (!companyId || typeof sessionStorage === 'undefined') return;

  try {
    sessionStorage.setItem(COMPANY_ID_STORAGE_KEY, companyId);
  } catch {
    // Ignore storage errors; URL/referrer extraction still works for the current request.
  }
}

function readStoredExtensionId() {
  if (typeof sessionStorage === 'undefined') return '';

  try {
    return (sessionStorage.getItem(EXTENSION_ID_STORAGE_KEY) || '').trim();
  } catch {
    return '';
  }
}

function persistExtensionId(extensionId) {
  if (!extensionId || typeof sessionStorage === 'undefined') return;

  try {
    sessionStorage.setItem(EXTENSION_ID_STORAGE_KEY, extensionId);
  } catch {
    // Ignore storage errors; URL/referrer extraction still works for the current request.
  }
}

function getFirstSearchParam(url, keys) {
  if (!url) return '';

  for (const key of keys) {
    const value = url.searchParams.get(key);
    if (value) return value.trim();
  }

  return '';
}

export function getRuntimeCompanyId() {
  const runtimeUrl = getRuntimeUrl();
  const referrerUrl = getReferrerUrl();
  const companyId = (
    getFirstSearchParam(runtimeUrl, COMPANY_ID_QUERY_KEYS)
    || getPathMatch(runtimeUrl?.pathname || '', /\/company\/([^/]+)/i)
    || getFirstSearchParam(referrerUrl, COMPANY_ID_QUERY_KEYS)
    || getPathMatch(referrerUrl?.pathname || '', /\/company\/([^/]+)/i)
    || readStoredCompanyId()
    || ''
  );

  persistCompanyId(companyId);
  return companyId;
}

export function getRuntimeExtensionId() {
  const runtimeUrl = getRuntimeUrl();
  const referrerUrl = getReferrerUrl();
  const extensionId = (
    getPathMatch(runtimeUrl?.pathname || '', /\/extensions\/([^/]+)/i)
    || getPathMatch(referrerUrl?.pathname || '', /\/extensions\/([^/]+)/i)
    || readStoredExtensionId()
    || ''
  );

  persistExtensionId(extensionId);
  return extensionId;
}

export function getRuntimeApplicationId() {
  const runtimeUrl = getRuntimeUrl();
  if (!runtimeUrl) return '';

  return (
    runtimeUrl.searchParams.get('applicationId')
    || runtimeUrl.searchParams.get('application_id')
    || getPathMatch(runtimeUrl.pathname, /\/application\/([^/]+)/i)
    || getPathMatch(runtimeUrl.pathname, /\/applications\/([^/]+)/i)
    || ''
  ).trim();
}