/*
 * Enterprise Dashboard Page
 * Main dashboard for enterprise parent tenants showing network-wide metrics
 */

import React, { useState, useEffect } from 'react';
import { useNavigate, useParams } from 'react-router-dom';
import {
  useNetworkSummary,
  useChildrenPerformance,
  useDistributionOverview,
  useForecastSummary
} from '../../api/hooks/useEnterpriseDashboard';
import { Card, CardContent, CardHeader, CardTitle } from '../../components/ui/Card';
import { Button } from '../../components/ui/Button';
import {
  TrendingUp,
  MapPin,
  Truck,
  Package,
  BarChart3,
  Network,
  Activity,
  Calendar,
  Clock,
  AlertTriangle,
  PackageCheck,
  Building2,
  ArrowLeft,
  ChevronRight
} from 'lucide-react';
import { useTranslation } from 'react-i18next';
import { LoadingSpinner } from '../../components/ui/LoadingSpinner';
import { ErrorBoundary } from 'react-error-boundary';
import { apiClient } from '../../api/client/apiClient';
import { useEnterprise } from '../../contexts/EnterpriseContext';
import { useTenant } from '../../stores/tenant.store';

// Components for enterprise dashboard
const NetworkSummaryCards = React.lazy(() => import('../../components/dashboard/NetworkSummaryCards'));
const DistributionMap = React.lazy(() => import('../../components/maps/DistributionMap'));
const PerformanceChart = React.lazy(() => import('../../components/charts/PerformanceChart'));

interface EnterpriseDashboardPageProps {
  tenantId?: string;
}

const EnterpriseDashboardPage: React.FC<EnterpriseDashboardPageProps> = ({ tenantId: propTenantId }) => {
  const { tenantId: urlTenantId } = useParams<{ tenantId: string }>();
  const tenantId = propTenantId || urlTenantId;
  const navigate = useNavigate();
  const { t } = useTranslation('dashboard');
  const { state: enterpriseState, drillDownToOutlet, returnToNetworkView, enterNetworkView } = useEnterprise();
  const { switchTenant } = useTenant();

  const [selectedMetric, setSelectedMetric] = useState('sales');
  const [selectedPeriod, setSelectedPeriod] = useState(30);
  const [selectedDate, setSelectedDate] = useState(new Date().toISOString().split('T')[0]);

  // Check if tenantId is available at the start
  useEffect(() => {
    if (!tenantId) {
      console.error('No tenant ID available for enterprise dashboard');
      navigate('/unauthorized');
    }
  }, [tenantId, navigate]);

  // Initialize enterprise mode on mount
  useEffect(() => {
    if (tenantId && !enterpriseState.parentTenantId) {
      enterNetworkView(tenantId);
    }
  }, [tenantId, enterpriseState.parentTenantId, enterNetworkView]);

  // Check if user has enterprise tier access
  useEffect(() => {
    const checkAccess = async () => {
      if (!tenantId) {
        console.error('No tenant ID available for enterprise dashboard');
        navigate('/unauthorized');
        return;
      }

      try {
        const response = await apiClient.get<{ tenant_type: string }>(`/tenants/${tenantId}`);

        if (response.tenant_type !== 'parent') {
          navigate('/unauthorized');
        }
      } catch (error) {
        console.error('Access check failed:', error);
        navigate('/unauthorized');
      }
    };

    checkAccess();
  }, [tenantId, navigate]);

  // Fetch network summary data
  const {
    data: networkSummary,
    isLoading: isNetworkSummaryLoading,
    error: networkSummaryError
  } = useNetworkSummary(tenantId!, {
    refetchInterval: 60000, // Refetch every minute
    enabled: !!tenantId, // Only fetch if tenantId is available
  });

  // Fetch children performance data
  const {
    data: childrenPerformance,
    isLoading: isChildrenPerformanceLoading,
    error: childrenPerformanceError
  } = useChildrenPerformance(tenantId!, selectedMetric, selectedPeriod, {
    enabled: !!tenantId, // Only fetch if tenantId is available
  });

  // Fetch distribution overview data
  const {
    data: distributionOverview,
    isLoading: isDistributionLoading,
    error: distributionError
  } = useDistributionOverview(tenantId!, selectedDate, {
    refetchInterval: 60000, // Refetch every minute
    enabled: !!tenantId, // Only fetch if tenantId is available
  });

  // Fetch enterprise forecast summary
  const {
    data: forecastSummary,
    isLoading: isForecastLoading,
    error: forecastError
  } = useForecastSummary(tenantId!, 7, {
    enabled: !!tenantId, // Only fetch if tenantId is available
  });

  // Handle outlet drill-down
  const handleOutletClick = async (outletId: string, outletName: string) => {
    // Calculate network metrics if available
    const networkMetrics = childrenPerformance?.rankings ? {
      totalSales: childrenPerformance.rankings.reduce((sum, r) => sum + (selectedMetric === 'sales' ? r.metric_value : 0), 0),
      totalProduction: 0,
      totalInventoryValue: childrenPerformance.rankings.reduce((sum, r) => sum + (selectedMetric === 'inventory_value' ? r.metric_value : 0), 0),
      averageSales: childrenPerformance.rankings.reduce((sum, r) => sum + (selectedMetric === 'sales' ? r.metric_value : 0), 0) / childrenPerformance.rankings.length,
      averageProduction: 0,
      averageInventoryValue: childrenPerformance.rankings.reduce((sum, r) => sum + (selectedMetric === 'inventory_value' ? r.metric_value : 0), 0) / childrenPerformance.rankings.length,
      childCount: childrenPerformance.rankings.length
    } : undefined;

    drillDownToOutlet(outletId, outletName, networkMetrics);
    await switchTenant(outletId);
    navigate('/app/dashboard');
  };

  // Handle return to network view
  const handleReturnToNetwork = async () => {
    if (enterpriseState.parentTenantId) {
      returnToNetworkView();
      await switchTenant(enterpriseState.parentTenantId);
      navigate(`/app/enterprise/${enterpriseState.parentTenantId}`);
    }
  };

  // Error boundary fallback
  const ErrorFallback = ({ error, resetErrorBoundary }: { error: Error; resetErrorBoundary: () => void }) => (
    <div className="p-6 text-center">
      <AlertTriangle className="mx-auto h-12 w-12 text-red-500 mb-4" />
      <h3 className="text-lg font-medium text-gray-900 mb-2">Something went wrong</h3>
      <p className="text-gray-500 mb-4">{error.message}</p>
      <Button onClick={resetErrorBoundary}>Try again</Button>
    </div>
  );

  if (isNetworkSummaryLoading || isChildrenPerformanceLoading || isDistributionLoading || isForecastLoading) {
    return (
      <div className="p-6 min-h-screen">
        <div className="flex items-center justify-center h-96">
          <LoadingSpinner text={t('enterprise.loading')} />
        </div>
      </div>
    );
  }

  if (networkSummaryError || childrenPerformanceError || distributionError || forecastError) {
    return (
      <div className="p-6 min-h-screen">
        <div className="bg-red-50 border border-red-200 rounded-lg p-6 text-center">
          <AlertTriangle className="mx-auto h-12 w-12 text-red-500 mb-4" />
          <h3 className="text-lg font-medium text-red-800 mb-2">Error Loading Dashboard</h3>
          <p className="text-red-600">
            {networkSummaryError?.message ||
              childrenPerformanceError?.message ||
              distributionError?.message ||
              forecastError?.message}
          </p>
        </div>
      </div>
    );
  }

  return (
    <ErrorBoundary FallbackComponent={ErrorFallback}>
      <div className="px-4 sm:px-6 lg:px-8 py-6 min-h-screen" style={{ backgroundColor: 'var(--bg-secondary)' }}>
        {/* Breadcrumb / Return to Network Banner */}
        {enterpriseState.selectedOutletId && !enterpriseState.isNetworkView && (
          <div className="mb-6 rounded-lg p-4" style={{
            backgroundColor: 'var(--color-info-light, #dbeafe)',
            borderColor: 'var(--color-info, #3b82f6)',
            borderWidth: '1px',
            borderStyle: 'solid'
          }}>
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-3">
                <Network className="w-5 h-5" style={{ color: 'var(--color-info)' }} />
                <div className="flex items-center gap-2 text-sm">
                  <span className="font-medium" style={{ color: 'var(--color-info)' }}>Network Overview</span>
                  <ChevronRight className="w-4 h-4" style={{ color: 'var(--color-info-light, #93c5fd)' }} />
                  <span className="text-gray-700 font-semibold">{enterpriseState.selectedOutletName}</span>
                </div>
              </div>
              <Button
                onClick={handleReturnToNetwork}
                variant="outline"
                size="sm"
                className="flex items-center gap-2"
              >
                <ArrowLeft className="w-4 h-4" />
                Return to Network View
              </Button>
            </div>
            {enterpriseState.networkMetrics && (
              <div className="mt-3 pt-3 border-t grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4 text-sm"
                   style={{ borderColor: 'var(--color-info-light, #93c5fd)' }}>
                <div>
                  <span style={{ color: 'var(--color-info)' }}>Network Average Sales:</span>
                  <span className="ml-2 font-semibold">€{enterpriseState.networkMetrics.averageSales.toLocaleString()}</span>
                </div>
                <div>
                  <span style={{ color: 'var(--color-info)' }}>Total Outlets:</span>
                  <span className="ml-2 font-semibold">{enterpriseState.networkMetrics.childCount}</span>
                </div>
                <div>
                  <span style={{ color: 'var(--color-info)' }}>Network Total:</span>
                  <span className="ml-2 font-semibold">€{enterpriseState.networkMetrics.totalSales.toLocaleString()}</span>
                </div>
              </div>
            )}
          </div>
        )}

        {/* Enhanced Header */}
        <div className="mb-8">
          <div className="flex items-center justify-between">
            {/* Title Section with Gradient Icon */}
            <div className="flex items-center gap-4">
              <div
                className="w-16 h-16 rounded-2xl flex items-center justify-center shadow-lg"
                style={{
                  background: 'linear-gradient(135deg, var(--color-info) 0%, var(--color-primary) 100%)',
                }}
              >
                <Network className="w-8 h-8 text-white" />
              </div>
              <div>
                <h1 className="text-4xl font-bold" style={{ color: 'var(--text-primary)' }}>
                  {t('enterprise.network_dashboard')}
                </h1>
                <p className="mt-1" style={{ color: 'var(--text-secondary)' }}>
                  {t('enterprise.network_summary_description')}
                </p>
              </div>
            </div>
          </div>
        </div>

        {/* Network Summary Cards */}
        <div className="mb-8">
          <NetworkSummaryCards
            data={networkSummary}
            isLoading={isNetworkSummaryLoading}
          />
        </div>

        {/* Distribution Map and Performance Chart Row */}
        <div className="grid grid-cols-1 lg:grid-cols-2 gap-8 mb-8">
          {/* Distribution Map */}
          <div>
            <Card className="h-full">
              <CardHeader className="flex flex-row items-center justify-between">
                <div className="flex items-center gap-2">
                  <Truck className="w-5 h-5 text-blue-600" />
                  <CardTitle>{t('enterprise.distribution_map')}</CardTitle>
                </div>
                <div className="flex items-center gap-2">
                  <Calendar className="w-4 h-4 text-gray-500" />
                  <input
                    type="date"
                    value={selectedDate}
                    onChange={(e) => setSelectedDate(e.target.value)}
                    className="border rounded px-2 py-1 text-sm"
                  />
                </div>
              </CardHeader>
              <CardContent>
                {distributionOverview ? (
                  <DistributionMap
                    routes={distributionOverview.route_sequences}
                    shipments={distributionOverview.status_counts}
                  />
                ) : (
                  <div className="h-96 flex items-center justify-center text-gray-500">
                    {t('enterprise.no_distribution_data')}
                  </div>
                )}
              </CardContent>
            </Card>
          </div>

          {/* Performance Chart */}
          <div>
            <Card className="h-full">
              <CardHeader className="flex flex-row items-center justify-between">
                <div className="flex items-center gap-2">
                  <BarChart3 className="w-5 h-5 text-green-600" />
                  <CardTitle>{t('enterprise.outlet_performance')}</CardTitle>
                </div>
                <div className="flex gap-2">
                  <select
                    value={selectedMetric}
                    onChange={(e) => setSelectedMetric(e.target.value)}
                    className="border rounded px-2 py-1 text-sm"
                  >
                    <option value="sales">{t('enterprise.metrics.sales')}</option>
                    <option value="inventory_value">{t('enterprise.metrics.inventory_value')}</option>
                    <option value="order_frequency">{t('enterprise.metrics.order_frequency')}</option>
                  </select>
                  <select
                    value={selectedPeriod}
                    onChange={(e) => setSelectedPeriod(Number(e.target.value))}
                    className="border rounded px-2 py-1 text-sm"
                  >
                    <option value={7}>{t('enterprise.last_7_days')}</option>
                    <option value={30}>{t('enterprise.last_30_days')}</option>
                    <option value={90}>{t('enterprise.last_90_days')}</option>
                  </select>
                </div>
              </CardHeader>
              <CardContent>
                {childrenPerformance ? (
                  <PerformanceChart
                    data={childrenPerformance.rankings}
                    metric={selectedMetric}
                    period={selectedPeriod}
                    onOutletClick={handleOutletClick}
                  />
                ) : (
                  <div className="h-96 flex items-center justify-center text-gray-500">
                    {t('enterprise.no_performance_data')}
                  </div>
                )}
              </CardContent>
            </Card>
          </div>
        </div>

        {/* Forecast Summary */}
        <div className="mb-8">
          <Card>
            <CardHeader className="flex flex-row items-center gap-2">
              <TrendingUp className="w-5 h-5 text-purple-600" />
              <CardTitle>{t('enterprise.network_forecast')}</CardTitle>
            </CardHeader>
            <CardContent>
              {forecastSummary && forecastSummary.aggregated_forecasts ? (
                <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
                  {/* Total Demand Card */}
                  <div
                    className="p-6 rounded-xl border-2 transition-all duration-300 hover:shadow-lg"
                    style={{
                      backgroundColor: 'var(--color-info-50)',
                      borderColor: 'var(--color-info-200)',
                    }}
                  >
                    <div className="flex items-center gap-3 mb-3">
                      <div
                        className="w-10 h-10 rounded-lg flex items-center justify-center shadow-md"
                        style={{ backgroundColor: 'var(--color-info-100)' }}
                      >
                        <Package className="w-5 h-5" style={{ color: 'var(--color-info-600)' }} />
                      </div>
                      <h3 className="font-semibold text-sm" style={{ color: 'var(--color-info-800)' }}>
                        {t('enterprise.total_demand')}
                      </h3>
                    </div>
                    <p className="text-3xl font-bold" style={{ color: 'var(--color-info-900)' }}>
                      {Object.values(forecastSummary.aggregated_forecasts).reduce((total: number, day: any) =>
                        total + Object.values(day).reduce((dayTotal: number, product: any) =>
                          dayTotal + (product.predicted_demand || 0), 0), 0
                      ).toLocaleString()}
                    </p>
                  </div>

                  {/* Days Forecast Card */}
                  <div
                    className="p-6 rounded-xl border-2 transition-all duration-300 hover:shadow-lg"
                    style={{
                      backgroundColor: 'var(--color-success-50)',
                      borderColor: 'var(--color-success-200)',
                    }}
                  >
                    <div className="flex items-center gap-3 mb-3">
                      <div
                        className="w-10 h-10 rounded-lg flex items-center justify-center shadow-md"
                        style={{ backgroundColor: 'var(--color-success-100)' }}
                      >
                        <Calendar className="w-5 h-5" style={{ color: 'var(--color-success-600)' }} />
                      </div>
                      <h3 className="font-semibold text-sm" style={{ color: 'var(--color-success-800)' }}>
                        {t('enterprise.days_forecast')}
                      </h3>
                    </div>
                    <p className="text-3xl font-bold" style={{ color: 'var(--color-success-900)' }}>
                      {forecastSummary.days_forecast || 7}
                    </p>
                  </div>

                  {/* Average Daily Demand Card */}
                  <div
                    className="p-6 rounded-xl border-2 transition-all duration-300 hover:shadow-lg"
                    style={{
                      backgroundColor: 'var(--color-secondary-50)',
                      borderColor: 'var(--color-secondary-200)',
                    }}
                  >
                    <div className="flex items-center gap-3 mb-3">
                      <div
                        className="w-10 h-10 rounded-lg flex items-center justify-center shadow-md"
                        style={{ backgroundColor: 'var(--color-secondary-100)' }}
                      >
                        <Activity className="w-5 h-5" style={{ color: 'var(--color-secondary-600)' }} />
                      </div>
                      <h3 className="font-semibold text-sm" style={{ color: 'var(--color-secondary-800)' }}>
                        {t('enterprise.avg_daily_demand')}
                      </h3>
                    </div>
                    <p className="text-3xl font-bold" style={{ color: 'var(--color-secondary-900)' }}>
                      {forecastSummary.aggregated_forecasts
                        ? Math.round(Object.values(forecastSummary.aggregated_forecasts).reduce((total: number, day: any) =>
                          total + Object.values(day).reduce((dayTotal: number, product: any) =>
                            dayTotal + (product.predicted_demand || 0), 0), 0) /
                          Object.keys(forecastSummary.aggregated_forecasts).length
                        ).toLocaleString()
                        : 0}
                    </p>
                  </div>

                  {/* Last Updated Card */}
                  <div
                    className="p-6 rounded-xl border-2 transition-all duration-300 hover:shadow-lg"
                    style={{
                      backgroundColor: 'var(--color-warning-50)',
                      borderColor: 'var(--color-warning-200)',
                    }}
                  >
                    <div className="flex items-center gap-3 mb-3">
                      <div
                        className="w-10 h-10 rounded-lg flex items-center justify-center shadow-md"
                        style={{ backgroundColor: 'var(--color-warning-100)' }}
                      >
                        <Clock className="w-5 h-5" style={{ color: 'var(--color-warning-600)' }} />
                      </div>
                      <h3 className="font-semibold text-sm" style={{ color: 'var(--color-warning-800)' }}>
                        {t('enterprise.last_updated')}
                      </h3>
                    </div>
                    <p className="text-lg font-semibold" style={{ color: 'var(--color-warning-900)' }}>
                      {forecastSummary.last_updated ?
                        new Date(forecastSummary.last_updated).toLocaleTimeString() :
                        'N/A'}
                    </p>
                  </div>
                </div>
              ) : (
                <div className="flex items-center justify-center h-48 text-gray-500">
                  {t('enterprise.no_forecast_data')}
                </div>
              )}
            </CardContent>
          </Card>
        </div>

        {/* Quick Actions */}
        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
          <Card>
            <CardContent className="p-6">
              <div className="flex items-center gap-3 mb-4">
                <Building2 className="w-6 h-6 text-blue-600" />
                <h3 className="text-lg font-semibold">Agregar Punto de Venta</h3>
              </div>
              <p className="text-gray-600 mb-4">Añadir un nuevo outlet a la red enterprise</p>
              <Button
                onClick={() => navigate(`/app/tenants/${tenantId}/settings/organization`)}
                className="w-full"
              >
                Crear Outlet
              </Button>
            </CardContent>
          </Card>

          <Card>
            <CardContent className="p-6">
              <div className="flex items-center gap-3 mb-4">
                <PackageCheck className="w-6 h-6 text-green-600" />
                <h3 className="text-lg font-semibold">Transferencias Internas</h3>
              </div>
              <p className="text-gray-600 mb-4">Gestionar pedidos entre obrador central y outlets</p>
              <Button
                onClick={() => navigate(`/app/tenants/${tenantId}/procurement/internal-transfers`)}
                variant="outline"
                className="w-full"
              >
                Ver Transferencias
              </Button>
            </CardContent>
          </Card>

          <Card>
            <CardContent className="p-6">
              <div className="flex items-center gap-3 mb-4">
                <MapPin className="w-6 h-6 text-red-600" />
                <h3 className="text-lg font-semibold">Rutas de Distribución</h3>
              </div>
              <p className="text-gray-600 mb-4">Optimizar rutas de entrega entre ubicaciones</p>
              <Button
                onClick={() => navigate(`/app/tenants/${tenantId}/distribution/routes`)}
                variant="outline"
                className="w-full"
              >
                Ver Rutas
              </Button>
            </CardContent>
          </Card>
        </div>
      </div>
    </ErrorBoundary>
  );
};

export default EnterpriseDashboardPage;