# All files / src/components/device DeviceManagementInterface.tsx

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     'use client';

    import React, { useState } from 'react';
    import { useQuery } from '@tanstack/react-query';
    import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
    import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
    import { Alert, AlertDescription } from '@/components/ui/alert';
    import { Smartphone, Users, BarChart3, AlertTriangle } from 'lucide-react';
    import { deviceService } from '@/services/device';
    import ActiveDeviceList from './ActiveDeviceList';
    import DeviceRemovalInterface from './DeviceRemovalInterface';
    import DeviceLimitWarning from './DeviceLimitWarning';
    import { useTranslation } from 'react-i18next';
    import useLoadNamespace from '@/hooks/useLoadNamespace';

    interface DeviceManagementInterfaceProps {
      className?: string;
    }

    export default function DeviceManagementInterface({ className }: DeviceManagementInterfaceProps) {
      const [activeTab, setActiveTab] = useState('overview');
      // Load admin/devices namespace and use it exclusively to avoid raw dotted keys
      useLoadNamespace('admin/devices');
      const { t } = useTranslation('admin/devices');

      // Fetch device statistics
      const { data: deviceStats, isLoading: isStatsLoading, error: statsError } = useQuery({
        queryKey: ['device-stats'],
        queryFn: async () => {
          const result = await deviceService.getDeviceStats();
          if (result.success) {
            return result.data;
          }
          throw new Error(result.error.details);
        }});

      // Fetch all devices for admin view
      const { data: allDevicesData, isLoading: isDevicesLoading, error: devicesError } = useQuery({
        queryKey: ['all-devices'],
        queryFn: async () => {
          const result = await deviceService.getAllDevices();
          if (result.success) {
            return result.data;
          }
          throw new Error(result.error.details);
        }});

      if (statsError || devicesError) {
        return (
          <Card className={className}>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Smartphone className="h-5 w-5" />
                {t('devices.title')}
              </CardTitle>
            </CardHeader>
            <CardContent>
              <Alert variant="destructive">
                <AlertTriangle className="h-4 w-4" />
                <AlertDescription>
                  {t('devices.errors.loadFailed')}
                </AlertDescription>
              </Alert>
            </CardContent>
          </Card>
        );
      }

      return (
        <div className={className}>
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Smartphone className="h-5 w-5" />
                {t('devices.title')}
              </CardTitle>
              <CardDescription>
                {t('devices.description')}
              </CardDescription>
            </CardHeader>
            <CardContent>
              <Tabs value={activeTab} onValueChange={setActiveTab} className="space-y-6">
                <TabsList className="grid w-full grid-cols-4">
                  <TabsTrigger value="overview" className="flex items-center gap-2">
                    <BarChart3 className="h-4 w-4" />
                    {t('devices.overviewTitle')}
                  </TabsTrigger>
                  <TabsTrigger value="active-devices" className="flex items-center gap-2">
                    <Smartphone className="h-4 w-4" />
                    {t('devices.activeDevices')}
                  </TabsTrigger>
                  <TabsTrigger value="device-removal" className="flex items-center gap-2">
                    <AlertTriangle className="h-4 w-4" />
                    {t('devices.deviceRemoval')}
                  </TabsTrigger>
                  <TabsTrigger value="warnings" className="flex items-center gap-2">
                    <AlertTriangle className="h-4 w-4" />
                    {t('devices.warnings')}
                  </TabsTrigger>
                </TabsList>

                {/* Overview Tab */}
                <TabsContent value="overview" className="space-y-6">
                  <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-4">
                    {/* Total Devices */}
                    <Card>
                      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                        <CardTitle className="text-sm font-medium">{t('devices.totalDevices')}</CardTitle>
                        <Smartphone className="h-4 w-4 text-muted-foreground" />
                      </CardHeader>
                      <CardContent>
                        <div className="text-2xl font-bold">
                          {isStatsLoading ? '...' : deviceStats?.total_devices || 0}
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {t('devices.registeredDevices')}
                        </p>
                      </CardContent>
                    </Card>

                    {/* Active Devices */}
                    <Card>
                      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                        <CardTitle className="text-sm font-medium">{t('devices.activeDevices')}</CardTitle>
                        <Smartphone className="h-4 w-4 text-green-600" />
                      </CardHeader>
                      <CardContent>
                        <div className="text-2xl font-bold">
                          {isStatsLoading ? '...' : deviceStats?.active_devices || 0}
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {t('devices.currentlyConnected')}
                        </p>
                      </CardContent>
                    </Card>

                    {/* Users with Devices */}
                    <Card>
                      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                        <CardTitle className="text-sm font-medium">{t('devices.usersWithDevices')}</CardTitle>
                        <Users className="h-4 w-4 text-muted-foreground" />
                      </CardHeader>
                      <CardContent>
                        <div className="text-2xl font-bold">
                          {isStatsLoading ? '...' : deviceStats?.users_with_devices || 0}
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {t('devices.activeUsers')}
                        </p>
                      </CardContent>
                    </Card>

                    {/* Device Limit Warnings */}
                    <Card>
                      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                        <CardTitle className="text-sm font-medium">{t('devices.limitWarnings')}</CardTitle>
                        <AlertTriangle className="h-4 w-4 text-yellow-600" />
                      </CardHeader>
                      <CardContent>
                        <div className="text-2xl font-bold">
                          {isStatsLoading ? '...' : deviceStats?.users_at_limit || 0}
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {t('devices.usersAtLimit')}
                        </p>
                      </CardContent>
                    </Card>
                  </div>

                  {/* Device Statistics Section */}
                  <Card>
                    <CardHeader>
                      <CardTitle className="flex items-center gap-2">
                        <BarChart3 className="h-5 w-5" />
                        {t('devices.deviceStatistics.title')}
                      </CardTitle>
                      <CardDescription>
                        {t('devices.statsDescription')}
                      </CardDescription>
                    </CardHeader>
                    <CardContent className="space-y-6">
                      {/* Summary Metrics */}
                      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
                        <div className="p-4 border rounded-lg">
                          <div className="flex items-center gap-2 mb-2">
                            <BarChart3 className="h-4 w-4 text-blue-600" />
                            <span className="text-sm font-medium">{t('devices.avgDevicesPerUser')}</span>
                          </div>
                          <div className="text-2xl font-bold">
                            {isStatsLoading ? '...' : deviceStats?.avg_devices_per_user?.toFixed(1) || '0'}
                          </div>
                        </div>

                        <div className="p-4 border rounded-lg">
                          <div className="flex items-center gap-2 mb-2">
                            <AlertTriangle className="h-4 w-4 text-red-600" />
                            <span className="text-sm font-medium">{t('devices.usersAtLimit')}</span>
                          </div>
                          <div className="text-2xl font-bold">
                            {isStatsLoading ? '...' : deviceStats?.users_at_limit || 0}
                          </div>
                        </div>

                        <div className="p-4 border rounded-lg">
                          <div className="flex items-center gap-2 mb-2">
                            <Smartphone className="h-4 w-4 text-green-600" />
                            <span className="text-sm font-medium">{t('devices.totalCapacity')}</span>
                          </div>
                          <div className="text-2xl font-bold">
                            {isStatsLoading ? '...' : deviceStats?.total_capacity || 0}
                          </div>
                        </div>

                        <div className="p-4 border rounded-lg">
                          <div className="flex items-center gap-2 mb-2">
                            <BarChart3 className="h-4 w-4 text-purple-600" />
                            <span className="text-sm font-medium">{t('devices.utilization')}</span>
                          </div>
                          <div className="text-2xl font-bold">
                            {isStatsLoading ? '...' : `${deviceStats?.utilization || 0}%`}
                          </div>
                        </div>
                      </div>

                      {/* Device Usage by User */}
                      <div>
                        <h3 className="text-lg font-medium mb-4">{t('devices.usageByUserTitle')}</h3>
                        {!deviceStats?.devices_by_user || deviceStats.devices_by_user.length === 0 ? (
                          <div className="text-center py-8">
                            <Users className="h-12 w-12 text-gray-400 mx-auto mb-4" />
                            <h3 className="text-lg font-medium text-gray-900 mb-2">
                              {t('devices.deviceUsageByUser.none')}
                            </h3>
                            <p className="text-gray-500">
                              {t('devices.usageByUserDescription')}
                            </p>
                          </div>
                        ) : (
                          <div className="space-y-2">
                            {deviceStats.devices_by_user.map((user) => (
                              <div key={user.user_id} className="flex items-center justify-between p-3 border rounded-lg">
                                <div className="flex items-center gap-2">
                                  <Users className="h-4 w-4 text-muted-foreground" />
                                  <span className="font-medium">{user.username}</span>
                                </div>
                                <div className="flex items-center gap-4">
                                  <span className="text-sm text-muted-foreground">
                                    {t('devices.overview.deviceCount', { count: user.device_count, max: user.max_devices })}
                                  </span>
                                  <div className="w-24 bg-gray-200 rounded-full h-2">
                                    <div
                                      className="bg-blue-600 h-2 rounded-full"
                                      style={{ width: `${Math.min((user.device_count / user.max_devices) * 100, 100)}%` }}
                                    ></div>
                                  </div>
                                </div>
                              </div>
                            ))}
                          </div>
                        )}
                      </div>

                      {/* Usage Distribution */}
                      <div>
                        <h3 className="text-lg font-medium mb-4">{t('devices.usageDistribution')}</h3>
                        <div className="grid gap-4 md:grid-cols-2">
                          <div>
                            <h4 className="text-sm font-medium mb-2">{t('devices.byUsageLevel')}</h4>
                            <div className="space-y-2">
                              <div className="flex items-center justify-between">
                                <div className="flex items-center gap-2">
                                  <div className="w-3 h-3 bg-green-500 rounded-full"></div>
                                  <span className="text-sm">{t('devices.lowUsage')}</span>
                                </div>
                                <span className="text-sm font-medium">0</span>
                              </div>
                            </div>
                          </div>
                          <div>
                            <h4 className="text-sm font-medium mb-2">{t('devices.systemHealth.title')}</h4>
                            <div className="space-y-2">
                              <div className="flex items-center justify-between">
                                <span className="text-sm">{t('devices.activeDevices')}</span>
                                <span className="text-sm font-medium">{deviceStats?.active_devices || 0}</span>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </CardContent>
                  </Card>
                </TabsContent>

                {/* Active Devices Tab */}
                <TabsContent value="active-devices">
                    <ActiveDeviceList
                      devicesData={allDevicesData}
                      isLoading={isDevicesLoading}
                    />
                </TabsContent>

                {/* Device Removal Tab */}
                <TabsContent value="device-removal">
                    <DeviceRemovalInterface
                      devicesData={allDevicesData}
                      isLoading={isDevicesLoading}
                    />
                </TabsContent>

                {/* Warnings Tab */}
                <TabsContent value="warnings">
                    <DeviceLimitWarning
                      deviceStats={deviceStats}
                      isLoading={isStatsLoading}
                    />
                </TabsContent>

              </Tabs>
            </CardContent>
          </Card>
        </div>
      );
    }