import 'package:flutter/material.dart';

import '../../../models/network/network_device.dart';
import 'network_device_icon.dart';

/// A styled node representing one network device on the topology canvas.
///
/// Accepts an explicit [nodeSize] so role-based sizing can be applied by the
/// canvas without this widget needing to know the layout strategy.
class DeviceNode extends StatelessWidget {
  const DeviceNode({
    super.key,
    required this.device,
    this.portCount,
    this.isSelected = false,
    this.isHighlighted = false,
    this.nodeSize = const Size(160, 110),
    this.onTap,
  });

  final NetworkDevice device;
  final int? portCount;
  final bool isSelected;
  final bool isHighlighted;
  final Size nodeSize;
  final VoidCallback? onTap;

  Color _accentForRole(ColorScheme cs, NetworkDeviceRole? role) {
    switch (role) {
      case NetworkDeviceRole.core:
        return cs.error;
      case NetworkDeviceRole.distribution:
        return cs.tertiary;
      case NetworkDeviceRole.access:
        return cs.primary;
      case NetworkDeviceRole.edge:
        return cs.secondary;
      case NetworkDeviceRole.endpoint:
      case null:
        return cs.outline;
    }
  }

  Color? _statusColor(ColorScheme cs, NetworkDeviceStatus status) {
    switch (status) {
      case NetworkDeviceStatus.online:
        return const Color(0xFF34A853); // Google green — universally understood
      case NetworkDeviceStatus.offline:
        return cs.error;
      case NetworkDeviceStatus.warning:
        return const Color(0xFFFBBC04); // Amber
      case NetworkDeviceStatus.unknown:
        return null; // No dot shown
    }
  }

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final tt = Theme.of(context).textTheme;
    final accent = _accentForRole(cs, device.role);
    final statusColor = _statusColor(cs, device.status);

    final bgColor = isSelected
        ? cs.primaryContainer
        : isHighlighted
            ? cs.secondaryContainer.withValues(alpha: 0.6)
            : cs.surfaceContainerHigh;
    final borderColor = isSelected
        ? cs.primary
        : isHighlighted
            ? cs.primary.withValues(alpha: 0.8)
            : accent.withValues(alpha: 0.6);
    final borderWidth = isSelected ? 2.0 : (isHighlighted ? 1.5 : 1.0);

    return AnimatedContainer(
      duration: const Duration(milliseconds: 180),
      curve: Curves.easeOut,
      decoration: BoxDecoration(
        color: bgColor,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: borderColor, width: borderWidth),
        boxShadow: (isHighlighted || isSelected)
            ? [
                BoxShadow(
                  color: cs.primary.withValues(alpha: 0.18),
                  blurRadius: 12,
                  offset: const Offset(0, 2),
                ),
              ]
            : null,
      ),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(16),
          child: Stack(
            children: [
              Container(
                width: nodeSize.width,
                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Row(
                      children: [
                        NetworkDeviceIcon(
                          kind: device.kind,
                          color: accent,
                          size: 20,
                        ),
                        const SizedBox(width: 6),
                        Expanded(
                          child: Text(
                            device.kind.label,
                            style: tt.labelSmall?.copyWith(color: accent),
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 4),
                    Text(
                      device.name,
                      style: tt.bodyMedium?.copyWith(fontWeight: FontWeight.w600),
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                    ),
                    if (device.vendor != null || device.model != null) ...[
                      const SizedBox(height: 2),
                      Text(
                        [
                          if (device.vendor != null) device.vendor,
                          if (device.model != null) device.model,
                        ].whereType<String>().join(' • '),
                        style: tt.labelSmall?.copyWith(
                            color: cs.onSurfaceVariant),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                    if (portCount != null) ...[
                      const SizedBox(height: 4),
                      Row(
                        children: [
                          Icon(
                            Icons.cable_outlined,
                            size: 12,
                            color: cs.onSurfaceVariant,
                          ),
                          const SizedBox(width: 4),
                          Text(
                            '$portCount ports',
                            style: tt.labelSmall?.copyWith(
                              color: cs.onSurfaceVariant,
                            ),
                          ),
                        ],
                      ),
                    ],
                  ],
                ),
              ),
              // Status dot — top-right, only shown when status is not unknown
              if (statusColor != null)
                Positioned(
                  top: 8,
                  right: 8,
                  child: Container(
                    width: 8,
                    height: 8,
                    decoration: BoxDecoration(
                      color: statusColor,
                      shape: BoxShape.circle,
                      border: Border.all(
                        color: bgColor,
                        width: 1.5,
                      ),
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}