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

import '../../domain/entities/monitor_state.dart';
import '../blocs/monitor/monitor_bloc.dart';
import '../blocs/monitor/monitor_event.dart';
import '../blocs/monitor/monitor_state.dart';

class MonitorGrid extends StatelessWidget {
  final int columns;

  const MonitorGrid({super.key, this.columns = 4});

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<MonitorBloc, MonitorBlocState>(
      builder: (context, state) {
        final monitors = state.availableMonitors;

        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Padding(
              padding: const EdgeInsets.only(bottom: 8),
              child: Text(
                'MONITORS',
                style: Theme.of(context).textTheme.titleMedium?.copyWith(
                      fontWeight: FontWeight.bold,
                    ),
              ),
            ),
            Wrap(
              spacing: 4,
              runSpacing: 4,
              children: monitors.map((monitorId) {
                final isSelected = state.selectedMonitorId == monitorId;
                final monitorState = state.monitorStates[monitorId];

                return _MonitorButton(
                  monitorId: monitorId,
                  isSelected: isSelected,
                  monitorState: monitorState,
                  onPressed: () => _onMonitorPressed(context, monitorId),
                  onLongPress: () => _onMonitorLongPress(context, monitorId),
                );
              }).toList(),
            ),
          ],
        );
      },
    );
  }

  void _onMonitorPressed(BuildContext context, int monitorId) {
    context.read<MonitorBloc>().add(SelectMonitor(monitorId));
  }

  void _onMonitorLongPress(BuildContext context, int monitorId) {
    context.read<MonitorBloc>().add(ClearMonitor(monitorId));
  }
}

class _MonitorButton extends StatelessWidget {
  final int monitorId;
  final bool isSelected;
  final MonitorState? monitorState;
  final VoidCallback onPressed;
  final VoidCallback onLongPress;

  const _MonitorButton({
    required this.monitorId,
    required this.isSelected,
    this.monitorState,
    required this.onPressed,
    required this.onLongPress,
  });

  @override
  Widget build(BuildContext context) {
    final hasAlarm = monitorState?.hasAlarm ?? false;
    final currentCamera = monitorState?.currentChannel ?? 0;
    final isActive = currentCamera > 0;

    Color backgroundColor;
    Color foregroundColor;
    Color? borderColor;

    if (hasAlarm) {
      backgroundColor = Colors.red.shade700;
      foregroundColor = Colors.white;
      borderColor = Colors.red.shade900;
    } else if (isSelected) {
      backgroundColor = Theme.of(context).colorScheme.primary;
      foregroundColor = Theme.of(context).colorScheme.onPrimary;
    } else if (isActive) {
      backgroundColor = Theme.of(context).colorScheme.primaryContainer;
      foregroundColor = Theme.of(context).colorScheme.onPrimaryContainer;
    } else {
      backgroundColor = Theme.of(context).colorScheme.surfaceContainerHighest;
      foregroundColor = Theme.of(context).colorScheme.onSurface;
    }

    return SizedBox(
      width: 64,
      height: 48,
      child: GestureDetector(
        onLongPress: onLongPress,
        child: ElevatedButton(
          onPressed: onPressed,
          style: ElevatedButton.styleFrom(
            backgroundColor: backgroundColor,
            foregroundColor: foregroundColor,
            padding: const EdgeInsets.all(4),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(4),
              side: borderColor != null
                  ? BorderSide(color: borderColor, width: 2)
                  : BorderSide.none,
            ),
          ),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  if (hasAlarm)
                    const Icon(Icons.warning, size: 12, color: Colors.yellow),
                  Text(
                    '$monitorId',
                    style: const TextStyle(
                        fontSize: 14, fontWeight: FontWeight.bold),
                  ),
                ],
              ),
              if (isActive)
                Text(
                  'C$currentCamera',
                  style: TextStyle(
                    fontSize: 10,
                    color: foregroundColor.withValues(alpha: 0.8),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}