import 'package:flutter/material.dart';
import 'package:gap/gap.dart';

class MonitoringPanel extends StatelessWidget {
  const MonitoringPanel({super.key});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              '시스템 모니터링',
              style: theme.textTheme.titleMedium?.copyWith(
                fontWeight: FontWeight.bold,
              ),
            ),
            const Gap(16),
            _MonitoringItem(
              label: 'CPU 사용률',
              value: 0.45,
              displayValue: '45%',
              color: Colors.blue,
            ),
            const Gap(12),
            _MonitoringItem(
              label: '메모리 사용률',
              value: 0.62,
              displayValue: '62%',
              color: Colors.orange,
            ),
            const Gap(12),
            _MonitoringItem(
              label: '디스크 사용률',
              value: 0.35,
              displayValue: '35%',
              color: Colors.green,
            ),
            const Gap(12),
            _MonitoringItem(
              label: '네트워크 I/O',
              value: 0.78,
              displayValue: '78 Mbps',
              color: Colors.purple,
            ),
            const Gap(16),
            const Divider(),
            const Gap(12),

            // 서비스 상태
            Text(
              '서비스 상태',
              style: theme.textTheme.titleSmall?.copyWith(
                fontWeight: FontWeight.bold,
              ),
            ),
            const Gap(12),
            const _ServiceStatus(
              name: 'API 서버',
              status: ServiceState.running,
            ),
            const _ServiceStatus(
              name: 'WebSocket',
              status: ServiceState.running,
            ),
            const _ServiceStatus(
              name: '데이터베이스',
              status: ServiceState.running,
            ),
            const _ServiceStatus(
              name: '캐시 서버',
              status: ServiceState.warning,
            ),
          ],
        ),
      ),
    );
  }
}

class _MonitoringItem extends StatelessWidget {
  const _MonitoringItem({
    required this.label,
    required this.value,
    required this.displayValue,
    required this.color,
  });

  final String label;
  final double value;
  final String displayValue;
  final Color color;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(label, style: theme.textTheme.bodyMedium),
            Text(
              displayValue,
              style: theme.textTheme.bodyMedium?.copyWith(
                fontWeight: FontWeight.w600,
              ),
            ),
          ],
        ),
        const Gap(6),
        ClipRRect(
          borderRadius: BorderRadius.circular(4),
          child: LinearProgressIndicator(
            value: value,
            backgroundColor: color.withValues(alpha: 0.1),
            valueColor: AlwaysStoppedAnimation(color),
            minHeight: 8,
          ),
        ),
      ],
    );
  }
}

enum ServiceState { running, stopped, warning }

class _ServiceStatus extends StatelessWidget {
  const _ServiceStatus({
    required this.name,
    required this.status,
  });

  final String name;
  final ServiceState status;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final (color, label) = switch (status) {
      ServiceState.running => (Colors.green, '정상'),
      ServiceState.stopped => (Colors.red, '중지'),
      ServiceState.warning => (Colors.orange, '경고'),
    };

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Container(
            width: 10,
            height: 10,
            decoration: BoxDecoration(
              color: color,
              shape: BoxShape.circle,
            ),
          ),
          const Gap(10),
          Expanded(
            child: Text(name, style: theme.textTheme.bodyMedium),
          ),
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
            decoration: BoxDecoration(
              color: color.withValues(alpha: 0.1),
              borderRadius: BorderRadius.circular(4),
            ),
            child: Text(
              label,
              style: theme.textTheme.bodySmall?.copyWith(
                color: color,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
        ],
      ),
    );
  }
}