import { useAuth } from './useAuth';
import { useUserRole } from './useUserRole';
import { useRequireMFA } from './useRequireMFA';

/**
 * Centralized AAL2 enforcement for all superuser actions
 * 
 * This hook ensures that ALL superuser actions require AAL2 authentication
 * if the user has MFA enrolled. It fails closed - blocking actions if
 * AAL verification is uncertain.
 * 
 * SECURITY PRINCIPLE: Superusers MUST verify MFA before performing
 * privileged operations that could affect other users or system settings.
 */

export interface SuperuserGuardState {
  // Core permissions
  isSuperuser: boolean;
  canPerformAction: boolean; // Only true if superuser AND has AAL2 (if MFA enrolled)
  
  // AAL2 state
  hasAAL2: boolean;
  needsAAL2Verification: boolean; // True if has MFA but not at AAL2
  isEnrolled: boolean;
  
  // Loading states
  loading: boolean;
  
  // Current AAL level
  aal: 'aal1' | 'aal2' | null;
}

/**
 * Hook to check if current user can perform superuser actions
 * Enforces AAL2 requirement when MFA is enrolled
 */
export function useSuperuserGuard(): SuperuserGuardState {
  const { aal, loading: authLoading } = useAuth();
  const { isSuperuser, loading: roleLoading } = useUserRole();
  const { 
    hasMFA, 
    isEnrolled, 
    needsVerification,
    loading: mfaLoading 
  } = useRequireMFA();
  
  const loading = authLoading || roleLoading || mfaLoading;
  const isSuperuserRole = isSuperuser();
  const hasAAL2 = hasMFA; // hasMFA means AAL2 + enrolled
  
  // CRITICAL: Superuser can only perform actions if:
  // 1. They have superuser role, AND
  // 2. Either (no MFA enrolled) OR (has AAL2)
  // This fails closed - if uncertain about MFA state, block action
  const canPerformAction = isSuperuserRole && (!isEnrolled || hasAAL2);
  
  // User needs AAL2 verification if:
  // - Is superuser
  // - Has MFA enrolled
  // - Currently at AAL1 (not AAL2)
  const needsAAL2Verification = isSuperuserRole && isEnrolled && !hasAAL2;
  
  return {
    isSuperuser: isSuperuserRole,
    canPerformAction,
    hasAAL2,
    needsAAL2Verification,
    isEnrolled,
    loading,
    aal,
  };
}