/**
 * useDashboard Hook
 *
 * Aggregates tenant and integration key stats for the dashboard overview.
 *
 * @layer Presentation
 */

import { useMemo } from 'react';
import { useTenants } from '@/features/tenants/hooks/useTenants';

export interface DashboardStats {
  totalTenants: number;
  activeTenants: number;
  totalIntegrationKeys: number;
  activeIntegrationKeys: number;
}

export interface UseDashboard {
  stats: DashboardStats;
  isLoading: boolean;
  error: string | null;
  refetch: () => void;
}

export function useDashboard(): UseDashboard {
  const { data, isLoading, error, refetch } = useTenants();

  const stats = useMemo<DashboardStats>(() => {
    const tenants = data?.tenants ?? [];
    const activeTenants = tenants.filter((t) => t.isActive());

    // Sum integrationKeysCount across all tenants for total,
    // and across active tenants only for active keys count
    const totalIntegrationKeys = tenants.reduce((sum, t) => sum + t.integrationKeysCount, 0);
    const activeIntegrationKeys = activeTenants.reduce((sum, t) => sum + t.integrationKeysCount, 0);

    return {
      totalTenants: tenants.length,
      activeTenants: activeTenants.length,
      totalIntegrationKeys,
      activeIntegrationKeys,
    };
  }, [data]);

  return {
    stats,
    isLoading,
    error: error?.message ?? null,
    refetch,
  };
}