import 'package:flutter/material.dart';

/// A widget that displays a grid of Material icons for selection.
///
/// Shows a button that opens a dialog with available icons.
class IconPicker extends StatelessWidget {
  const IconPicker({
    super.key,
    required this.selectedIcon,
    required this.onChanged,
    this.label = 'Icon',
  });

  /// Currently selected icon name.
  final String selectedIcon;

  /// Callback when an icon is selected.
  final ValueChanged<String> onChanged;

  /// Label for the field.
  final String label;

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

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: textTheme.labelMedium?.copyWith(
            color: colorScheme.onSurfaceVariant,
          ),
        ),
        const SizedBox(height: 8),
        InkWell(
          onTap: () => _showIconPicker(context),
          borderRadius: BorderRadius.circular(8),
          child: Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              border: Border.all(color: colorScheme.outline),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Row(
              children: [
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    color: colorScheme.primaryContainer,
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Icon(
                    getIconData(selectedIcon),
                    color: colorScheme.onPrimaryContainer,
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: Text(
                    selectedIcon,
                    style: textTheme.bodyLarge,
                  ),
                ),
                Icon(
                  Icons.arrow_drop_down,
                  color: colorScheme.onSurfaceVariant,
                ),
              ],
            ),
          ),
        ),
      ],
    );
  }

  Future<void> _showIconPicker(BuildContext context) async {
    final result = await showDialog<String>(
      context: context,
      builder: (context) => IconPickerDialog(
        selectedIcon: selectedIcon,
        onSelected: (icon) => Navigator.of(context).pop(icon),
      ),
    );

    if (result != null) {
      onChanged(result);
    }
  }
}

/// Dialog that displays a grid of icons.
class IconPickerDialog extends StatefulWidget {
  const IconPickerDialog({
    super.key,
    required this.selectedIcon,
    required this.onSelected,
  });

  final String selectedIcon;
  final ValueChanged<String> onSelected;

  @override
  State<IconPickerDialog> createState() => _IconPickerDialogState();
}

class _IconPickerDialogState extends State<IconPickerDialog> {
  String _searchQuery = '';

  List<String> get _filteredIcons {
    if (_searchQuery.isEmpty) {
      return availableIcons;
    }
    return availableIcons
        .where((icon) => icon.toLowerCase().contains(_searchQuery.toLowerCase()))
        .toList();
  }

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

    return Dialog(
      child: Container(
        width: 400,
        height: 500,
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              'Select Icon',
              style: Theme.of(context).textTheme.titleLarge,
            ),
            const SizedBox(height: 16),
            TextField(
              decoration: const InputDecoration(
                hintText: 'Search icons...',
                prefixIcon: Icon(Icons.search),
                border: OutlineInputBorder(),
                isDense: true,
              ),
              onChanged: (value) => setState(() => _searchQuery = value),
            ),
            const SizedBox(height: 16),
            Expanded(
              child: GridView.builder(
                gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                  crossAxisCount: 5,
                  mainAxisSpacing: 8,
                  crossAxisSpacing: 8,
                ),
                itemCount: _filteredIcons.length,
                itemBuilder: (context, index) {
                  final iconName = _filteredIcons[index];
                  final isSelected = iconName == widget.selectedIcon;

                  return InkWell(
                    onTap: () => widget.onSelected(iconName),
                    borderRadius: BorderRadius.circular(8),
                    child: Container(
                      decoration: BoxDecoration(
                        color: isSelected
                            ? colorScheme.primaryContainer
                            : colorScheme.surfaceContainerHighest,
                        borderRadius: BorderRadius.circular(8),
                        border: isSelected
                            ? Border.all(color: colorScheme.primary, width: 2)
                            : null,
                      ),
                      child: Tooltip(
                        message: iconName,
                        child: Icon(
                          getIconData(iconName),
                          color: isSelected
                              ? colorScheme.onPrimaryContainer
                              : colorScheme.onSurface,
                        ),
                      ),
                    ),
                  );
                },
              ),
            ),
            const SizedBox(height: 16),
            Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                TextButton(
                  onPressed: () => Navigator.of(context).pop(),
                  child: const Text('Cancel'),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

/// Common icons available for selection.
const List<String> availableIcons = [
  'home',
  'settings',
  'search',
  'menu',
  'add',
  'remove',
  'close',
  'check',
  'edit',
  'delete',
  'favorite',
  'star',
  'movie',
  'music_note',
  'photo',
  'videocam',
  'camera',
  'mic',
  'volume_up',
  'play_arrow',
  'pause',
  'stop',
  'skip_next',
  'skip_previous',
  'folder',
  'file_copy',
  'cloud',
  'cloud_download',
  'cloud_upload',
  'download',
  'upload',
  'share',
  'link',
  'public',
  'language',
  'dns',
  'storage',
  'memory',
  'code',
  'terminal',
  'bug_report',
  'api',
  'http',
  'vpn_key',
  'lock',
  'lock_open',
  'security',
  'verified_user',
  'admin_panel_settings',
  'monitor',
  'monitoring',
  'analytics',
  'dashboard',
  'speed',
  'timer',
  'schedule',
  'calendar_today',
  'event',
  'notifications',
  'email',
  'message',
  'chat',
  'forum',
  'person',
  'people',
  'group',
  'account_circle',
  'shopping_cart',
  'credit_card',
  'attach_money',
  'trending_up',
  'trending_down',
  'wifi',
  'bluetooth',
  'router',
  'devices',
  'computer',
  'laptop',
  'phone_android',
  'tablet',
  'watch',
  'tv',
  'games',
  'videogame_asset',
  'sports_esports',
  'local_cafe',
  'local_dining',
  'restaurant',
  'directions_car',
  'flight',
  'hotel',
  'map',
  'place',
  'explore',
  'navigation',
  'book',
  'school',
  'science',
  'psychology',
  'work',
  'business',
  'apartment',
  'location_city',
  'eco',
  'water_drop',
  'air',
  'thermostat',
  'bolt',
  'light_mode',
  'dark_mode',
  'brightness_4',
  'palette',
  'brush',
  'format_paint',
  'extension',
  'widgets',
  'view_module',
  'grid_view',
  'list',
  'table_chart',
  'pie_chart',
  'bar_chart',
  'show_chart',
  'donut_large',
  'disc_full',
];

/// Convert icon name string to IconData.
IconData getIconData(String iconName) {
  const iconMap = <String, IconData>{
    'home': Icons.home,
    'settings': Icons.settings,
    'search': Icons.search,
    'menu': Icons.menu,
    'add': Icons.add,
    'remove': Icons.remove,
    'close': Icons.close,
    'check': Icons.check,
    'edit': Icons.edit,
    'delete': Icons.delete,
    'favorite': Icons.favorite,
    'star': Icons.star,
    'movie': Icons.movie,
    'music_note': Icons.music_note,
    'photo': Icons.photo,
    'videocam': Icons.videocam,
    'camera': Icons.camera,
    'mic': Icons.mic,
    'volume_up': Icons.volume_up,
    'play_arrow': Icons.play_arrow,
    'pause': Icons.pause,
    'stop': Icons.stop,
    'skip_next': Icons.skip_next,
    'skip_previous': Icons.skip_previous,
    'folder': Icons.folder,
    'file_copy': Icons.file_copy,
    'cloud': Icons.cloud,
    'cloud_download': Icons.cloud_download,
    'cloud_upload': Icons.cloud_upload,
    'download': Icons.download,
    'upload': Icons.upload,
    'share': Icons.share,
    'link': Icons.link,
    'public': Icons.public,
    'language': Icons.language,
    'dns': Icons.dns,
    'storage': Icons.storage,
    'memory': Icons.memory,
    'code': Icons.code,
    'terminal': Icons.terminal,
    'bug_report': Icons.bug_report,
    'api': Icons.api,
    'http': Icons.http,
    'vpn_key': Icons.vpn_key,
    'lock': Icons.lock,
    'lock_open': Icons.lock_open,
    'security': Icons.security,
    'verified_user': Icons.verified_user,
    'admin_panel_settings': Icons.admin_panel_settings,
    'monitor': Icons.monitor,
    'monitoring': Icons.monitor_heart,
    'analytics': Icons.analytics,
    'dashboard': Icons.dashboard,
    'speed': Icons.speed,
    'timer': Icons.timer,
    'schedule': Icons.schedule,
    'calendar_today': Icons.calendar_today,
    'event': Icons.event,
    'notifications': Icons.notifications,
    'email': Icons.email,
    'message': Icons.message,
    'chat': Icons.chat,
    'forum': Icons.forum,
    'person': Icons.person,
    'people': Icons.people,
    'group': Icons.group,
    'account_circle': Icons.account_circle,
    'shopping_cart': Icons.shopping_cart,
    'credit_card': Icons.credit_card,
    'attach_money': Icons.attach_money,
    'trending_up': Icons.trending_up,
    'trending_down': Icons.trending_down,
    'wifi': Icons.wifi,
    'bluetooth': Icons.bluetooth,
    'router': Icons.router,
    'devices': Icons.devices,
    'computer': Icons.computer,
    'laptop': Icons.laptop,
    'phone_android': Icons.phone_android,
    'tablet': Icons.tablet,
    'watch': Icons.watch,
    'tv': Icons.tv,
    'games': Icons.games,
    'videogame_asset': Icons.videogame_asset,
    'sports_esports': Icons.sports_esports,
    'local_cafe': Icons.local_cafe,
    'local_dining': Icons.local_dining,
    'restaurant': Icons.restaurant,
    'directions_car': Icons.directions_car,
    'flight': Icons.flight,
    'hotel': Icons.hotel,
    'map': Icons.map,
    'place': Icons.place,
    'explore': Icons.explore,
    'navigation': Icons.navigation,
    'book': Icons.book,
    'school': Icons.school,
    'science': Icons.science,
    'psychology': Icons.psychology,
    'work': Icons.work,
    'business': Icons.business,
    'apartment': Icons.apartment,
    'location_city': Icons.location_city,
    'eco': Icons.eco,
    'water_drop': Icons.water_drop,
    'air': Icons.air,
    'thermostat': Icons.thermostat,
    'bolt': Icons.bolt,
    'light_mode': Icons.light_mode,
    'dark_mode': Icons.dark_mode,
    'brightness_4': Icons.brightness_4,
    'palette': Icons.palette,
    'brush': Icons.brush,
    'format_paint': Icons.format_paint,
    'extension': Icons.extension,
    'widgets': Icons.widgets,
    'view_module': Icons.view_module,
    'grid_view': Icons.grid_view,
    'list': Icons.list,
    'table_chart': Icons.table_chart,
    'pie_chart': Icons.pie_chart,
    'bar_chart': Icons.bar_chart,
    'show_chart': Icons.show_chart,
    'donut_large': Icons.donut_large,
    'disc_full': Icons.disc_full,
  };

  return iconMap[iconName] ?? Icons.help_outline;
}