import { queryClient } from '../lib/queryClient';

export const LOCAL_STORAGE_TOKEN_KEY = 'pfm_access_token';
export const LOCAL_STORAGE_USER_KEY = 'pfm_auth_user';
export const LOCAL_STORAGE_SUB_KEY = 'pfm_user_sub';
export const LOCAL_STORAGE_CLAIMS_KEY = 'pfm_user_claims';
export const LOCAL_STORAGE_USER_SYNC_KEY = 'pfm_user_sync_record';
export const LOCAL_STORAGE_ACTIVATION_PENDING_KEY = 'pfm_user_pending_activation';
export const LOCAL_STORAGE_ACTIVATION_REASON_KEY = 'pfm_user_pending_activation_reason';

export function isUserSyncEndpoint(url?: string): boolean {
  if (!url) return false;
  const clean = url.toLowerCase().split('?')[0];
  return clean.includes('/users/sync') || clean.includes('/integration/sync') || clean.includes('/user/sync');
}

export function isTenantEndpoint(url?: string): boolean {
  if (!url) return false;
  return url.toLowerCase().includes('/governance/tenants');
}

type SessionExpiredListener = (reason?: string) => void;
const listeners = new Set<SessionExpiredListener>();
let hasTriggeredSessionExpired = false;

export function triggerSessionExpired(reason?: string, requestUrl?: string): void {
  if (requestUrl && isUserSyncEndpoint(requestUrl)) return;
  if (typeof window !== 'undefined' && localStorage.getItem(LOCAL_STORAGE_ACTIVATION_PENDING_KEY)) return;
  if (hasTriggeredSessionExpired) return;

  const hasExistingToken = typeof window !== 'undefined' && !!localStorage.getItem(LOCAL_STORAGE_TOKEN_KEY);
  if (!hasExistingToken) return;

  hasTriggeredSessionExpired = true;
  if (typeof window !== 'undefined') {
    window.dispatchEvent(new CustomEvent('pfm:session-expired', { detail: { reason: reason || 'HTTP 401 Unauthorized' } }));
  }
  listeners.forEach((cb) => cb(reason));
}

export function onSessionExpired(listener: SessionExpiredListener): () => void {
  listeners.add(listener);
  return () => { listeners.delete(listener); };
}

export function resetSessionExpiredState(): void {
  hasTriggeredSessionExpired = false;
}

export function clearSessionAndRedirectToLanding(): void {
  if (typeof window === 'undefined') return;
  try {
    localStorage.removeItem(LOCAL_STORAGE_TOKEN_KEY);
    localStorage.removeItem(LOCAL_STORAGE_USER_KEY);
    localStorage.removeItem(LOCAL_STORAGE_SUB_KEY);
    localStorage.removeItem(LOCAL_STORAGE_CLAIMS_KEY);
    localStorage.removeItem(LOCAL_STORAGE_USER_SYNC_KEY);
    localStorage.removeItem(LOCAL_STORAGE_ACTIVATION_PENDING_KEY);
    localStorage.removeItem(LOCAL_STORAGE_ACTIVATION_REASON_KEY);
  } catch {}
  try { queryClient.clear(); } catch {}
  resetSessionExpiredState();
  window.location.replace('/');
}