'use client';

import { Activity, CheckCircle, AlertCircle, XCircle, Globe, Server } from 'lucide-react';

import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card';
import { useSystemHealth } from '@/hooks/useDashboardData';

type HealthSite = { status?: string };
type HealthResource = { status?: string };

export function SystemHealthTile() {
  const { data, loading, error } = useSystemHealth();

  // Calculate health data from API response
  const healthData = data ? {
    regions: {
      total: data.sites?.length || 0,
      healthy: data.sites?.filter((s: HealthSite) => s.status === 'ACTIVE').length || 0,
      warning: data.sites?.filter((s: HealthSite) => s.status === 'MAINTENANCE').length || 0,
      critical: data.sites?.filter((s: HealthSite) => s.status === 'INACTIVE').length || 0,
    },
    clusters: {
      total: data.resources?.length || 0,
      healthy: data.resources?.filter((r: HealthResource) => r.status === 'RUNNING').length || 0,
      warning: data.resources?.filter((r: HealthResource) => r.status === 'PROVISIONING').length || 0,
      critical: data.resources?.filter((r: HealthResource) => r.status === 'ERROR').length || 0,
    },
    nodes: {
      total: data.resources?.length || 0,
      healthy: data.resources?.filter((r: HealthResource) => r.status === 'RUNNING').length || 0,
      warning: data.resources?.filter((r: HealthResource) => r.status === 'PROVISIONING').length || 0,
      critical: data.resources?.filter((r: HealthResource) => r.status === 'ERROR').length || 0,
    },
  } : {
    regions: { total: 0, healthy: 0, warning: 0, critical: 0 },
    clusters: { total: 0, healthy: 0, warning: 0, critical: 0 },
    nodes: { total: 0, healthy: 0, warning: 0, critical: 0 },
  };

  if (loading) {
    return (
      <Card className="bg-gray-800 border-gray-700">
        <CardHeader>
          <CardTitle className="text-white flex items-center gap-2">
            <Activity className="h-5 w-5 text-orange-500" />
            System Health Overview
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="text-center text-gray-400 py-4">Loading...</div>
        </CardContent>
      </Card>
    );
  }

  if (error) {
    return (
      <Card className="bg-gray-800 border-gray-700">
        <CardHeader>
          <CardTitle className="text-white flex items-center gap-2">
            <Activity className="h-5 w-5 text-orange-500" />
            System Health Overview
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="text-center text-red-400 py-4">Error loading health data</div>
        </CardContent>
      </Card>
    );
  }

  const overallHealth = healthData.regions.healthy / healthData.regions.total > 0.95 ? 'healthy' : 
                        healthData.regions.healthy / healthData.regions.total > 0.85 ? 'warning' : 'critical';

  return (
    <Card className="bg-gray-800 border-gray-700">
      <CardHeader>
        <div className="flex items-center justify-between">
          <CardTitle className="text-white flex items-center gap-2">
            <Activity className="h-5 w-5 text-orange-500" />
            System Health Overview
          </CardTitle>
          <div className={`px-3 py-1 rounded-full text-xs font-semibold ${
            overallHealth === 'healthy' ? 'bg-green-500/20 text-green-400' :
            overallHealth === 'warning' ? 'bg-yellow-500/20 text-yellow-400' :
            'bg-red-500/20 text-red-400'
          }`}>
            {overallHealth === 'healthy' ? 'Healthy' : overallHealth === 'warning' ? 'Warning' : 'Critical'}
          </div>
        </div>
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          <div className="flex items-center justify-between p-3 bg-gray-900 rounded-lg">
            <div className="flex items-center gap-3">
              <Globe className="h-5 w-5 text-blue-400" />
              <div>
                <p className="text-sm text-gray-400">Regions</p>
                <p className="text-lg font-semibold text-white">{healthData.regions.total}</p>
              </div>
            </div>
            <div className="flex gap-2">
              <div className="flex items-center gap-1 text-green-400">
                <CheckCircle className="h-4 w-4" />
                <span className="text-sm">{healthData.regions.healthy}</span>
              </div>
              {healthData.regions.warning > 0 && (
                <div className="flex items-center gap-1 text-yellow-400">
                  <AlertCircle className="h-4 w-4" />
                  <span className="text-sm">{healthData.regions.warning}</span>
                </div>
              )}
              {healthData.regions.critical > 0 && (
                <div className="flex items-center gap-1 text-red-400">
                  <XCircle className="h-4 w-4" />
                  <span className="text-sm">{healthData.regions.critical}</span>
                </div>
              )}
            </div>
          </div>

          <div className="flex items-center justify-between p-3 bg-gray-900 rounded-lg">
            <div className="flex items-center gap-3">
              <Server className="h-5 w-5 text-purple-400" />
              <div>
                <p className="text-sm text-gray-400">Clusters</p>
                <p className="text-lg font-semibold text-white">{healthData.clusters.total}</p>
              </div>
            </div>
            <div className="flex gap-2">
              <div className="flex items-center gap-1 text-green-400">
                <CheckCircle className="h-4 w-4" />
                <span className="text-sm">{healthData.clusters.healthy}</span>
              </div>
              {healthData.clusters.warning > 0 && (
                <div className="flex items-center gap-1 text-yellow-400">
                  <AlertCircle className="h-4 w-4" />
                  <span className="text-sm">{healthData.clusters.warning}</span>
                </div>
              )}
            </div>
          </div>

          <div className="flex items-center justify-between p-3 bg-gray-900 rounded-lg">
            <div className="flex items-center gap-3">
              <Activity className="h-5 w-5 text-cyan-400" />
              <div>
                <p className="text-sm text-gray-400">Nodes</p>
                <p className="text-lg font-semibold text-white">{healthData.nodes.total}</p>
              </div>
            </div>
            <div className="flex gap-2">
              <div className="flex items-center gap-1 text-green-400">
                <CheckCircle className="h-4 w-4" />
                <span className="text-sm">{healthData.nodes.healthy}</span>
              </div>
              {healthData.nodes.warning > 0 && (
                <div className="flex items-center gap-1 text-yellow-400">
                  <AlertCircle className="h-4 w-4" />
                  <span className="text-sm">{healthData.nodes.warning}</span>
                </div>
              )}
              {healthData.nodes.critical > 0 && (
                <div className="flex items-center gap-1 text-red-400">
                  <XCircle className="h-4 w-4" />
                  <span className="text-sm">{healthData.nodes.critical}</span>
                </div>
              )}
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
}