import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:tatlock_ui/features/front_hall/data/models/environment_model.dart';

/// Forecast widget displaying multi-day weather outlook.
///
/// Shows a horizontal scrollable list of forecast days with
/// high/low temperatures and weather icons.
class ForecastWidget extends StatelessWidget {
  const ForecastWidget({
    super.key,
    this.forecast,
    this.compact = false,
  });

  /// Forecast data to display.
  final List<ForecastDay>? forecast;

  /// Whether to use compact layout.
  final bool compact;

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

    if (forecast == null || forecast!.isEmpty) {
      return Card(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              // Header
              Row(
                children: [
                  Icon(
                    Icons.calendar_today,
                    size: 20,
                    color: colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(width: 8),
                  Text(
                    'Forecast',
                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
                          color: colorScheme.onSurfaceVariant,
                        ),
                  ),
                ],
              ),
              const SizedBox(height: 8),
              // Match sun position card height (170px content area)
              SizedBox(
                height: 170,
                child: Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(
                        Icons.event_busy_outlined,
                        size: 32,
                        color: colorScheme.outline,
                      ),
                      const SizedBox(height: 8),
                      Text(
                        'No data available',
                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                              color: colorScheme.outline,
                            ),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      );
    }

    if (compact) {
      return _buildCompact(context, colorScheme);
    }

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            // Header
            Row(
              children: [
                Icon(
                  Icons.calendar_today,
                  size: 20,
                  color: colorScheme.onSurfaceVariant,
                ),
                const SizedBox(width: 8),
                Text(
                  'Forecast',
                  style: Theme.of(context).textTheme.titleSmall?.copyWith(
                        color: colorScheme.onSurfaceVariant,
                      ),
                ),
              ],
            ),
            const SizedBox(height: 8),

            // Content area with fixed height, card bottoms at horizon (50px from bottom)
            SizedBox(
              height: 170,
              child: Padding(
                padding: const EdgeInsets.only(bottom: 50),
                child: Align(
                  alignment: Alignment.bottomCenter,
                  child: SizedBox(
                    height: 110,
                    child: ListView.separated(
                      scrollDirection: Axis.horizontal,
                      itemCount: forecast!.length,
                      separatorBuilder: (_, i) => const SizedBox(width: 12),
                      itemBuilder: (context, index) {
                        return _ForecastDayCard(day: forecast![index]);
                      },
                    ),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildCompact(BuildContext context, ColorScheme colorScheme) {
    // Show just first 3 days in compact mode
    final days = forecast!.take(3).toList();

    return Card(
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              Icons.calendar_today,
              size: 20,
              color: colorScheme.onSurfaceVariant,
            ),
            const SizedBox(width: 8),
            ...days.map((day) => Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 4),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(
                        _getDayName(day.date),
                        style: Theme.of(context).textTheme.labelSmall,
                      ),
                      Icon(
                        _getWeatherIcon(day.conditions),
                        size: 16,
                        color: _getWeatherColor(day.conditions),
                      ),
                      Text(
                        '${day.high?.round() ?? '--'}°',
                        style: Theme.of(context).textTheme.labelSmall,
                      ),
                    ],
                  ),
                )),
          ],
        ),
      ),
    );
  }

  String _getDayName(String dateStr) {
    try {
      final date = DateTime.parse(dateStr);
      final now = DateTime.now();
      if (date.day == now.day &&
          date.month == now.month &&
          date.year == now.year) {
        return 'Today';
      }
      final tomorrow = now.add(const Duration(days: 1));
      if (date.day == tomorrow.day &&
          date.month == tomorrow.month &&
          date.year == tomorrow.year) {
        return 'Tmrw';
      }
      return DateFormat('E').format(date);
    } catch (_) {
      return dateStr.length > 3 ? dateStr.substring(0, 3) : dateStr;
    }
  }

  IconData _getWeatherIcon(String? conditions) {
    final condition = conditions?.toLowerCase() ?? '';

    if (condition.contains('clear') || condition.contains('sunny')) {
      return Icons.wb_sunny;
    } else if (condition.contains('cloud') || condition.contains('overcast')) {
      return Icons.cloud;
    } else if (condition.contains('rain') || condition.contains('drizzle')) {
      return Icons.grain;
    } else if (condition.contains('storm') || condition.contains('thunder')) {
      return Icons.thunderstorm;
    } else if (condition.contains('snow') || condition.contains('sleet')) {
      return Icons.ac_unit;
    } else if (condition.contains('fog') || condition.contains('mist')) {
      return Icons.blur_on;
    }
    return Icons.cloud;
  }

  Color? _getWeatherColor(String? conditions) {
    final condition = conditions?.toLowerCase() ?? '';

    if (condition.contains('clear') || condition.contains('sunny')) {
      return Colors.amber;
    } else if (condition.contains('cloud')) {
      return Colors.blueGrey;
    } else if (condition.contains('rain')) {
      return Colors.blue;
    } else if (condition.contains('storm')) {
      return Colors.deepPurple;
    } else if (condition.contains('snow')) {
      return Colors.lightBlue;
    }
    return null;
  }
}

class _ForecastDayCard extends StatelessWidget {
  const _ForecastDayCard({required this.day});

  final ForecastDay day;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final icon = _getWeatherIcon(day.conditions);
    final color = _getWeatherColor(day.conditions) ?? colorScheme.primary;

    return Container(
      width: 72,
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 12),
      decoration: BoxDecoration(
        color: colorScheme.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          // Day name
          Text(
            _getDayName(day.date),
            style: Theme.of(context).textTheme.labelMedium?.copyWith(
                  fontWeight: FontWeight.w600,
                ),
          ),

          // Weather icon
          Icon(
            icon,
            size: 24,
            color: color,
          ),

          // High/Low temps
          Column(
            children: [
              Text(
                '${day.high?.round() ?? '--'}°',
                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                      fontWeight: FontWeight.bold,
                    ),
              ),
              Text(
                '${day.low?.round() ?? '--'}°',
                style: Theme.of(context).textTheme.labelSmall?.copyWith(
                      color: colorScheme.onSurfaceVariant,
                    ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  String _getDayName(String dateStr) {
    try {
      final date = DateTime.parse(dateStr);
      final now = DateTime.now();
      if (date.day == now.day &&
          date.month == now.month &&
          date.year == now.year) {
        return 'Today';
      }
      final tomorrow = now.add(const Duration(days: 1));
      if (date.day == tomorrow.day &&
          date.month == tomorrow.month &&
          date.year == tomorrow.year) {
        return 'Tmrw';
      }
      return DateFormat('EEE').format(date);
    } catch (_) {
      return dateStr.length > 3 ? dateStr.substring(0, 3) : dateStr;
    }
  }

  IconData _getWeatherIcon(String? conditions) {
    final condition = conditions?.toLowerCase() ?? '';

    if (condition.contains('clear') || condition.contains('sunny')) {
      return Icons.wb_sunny;
    } else if (condition.contains('cloud') || condition.contains('overcast')) {
      return Icons.cloud;
    } else if (condition.contains('rain') || condition.contains('drizzle')) {
      return Icons.grain;
    } else if (condition.contains('storm') || condition.contains('thunder')) {
      return Icons.thunderstorm;
    } else if (condition.contains('snow') || condition.contains('sleet')) {
      return Icons.ac_unit;
    } else if (condition.contains('fog') || condition.contains('mist')) {
      return Icons.blur_on;
    }
    return Icons.cloud;
  }

  Color? _getWeatherColor(String? conditions) {
    final condition = conditions?.toLowerCase() ?? '';

    if (condition.contains('clear') || condition.contains('sunny')) {
      return Colors.amber;
    } else if (condition.contains('cloud')) {
      return Colors.blueGrey;
    } else if (condition.contains('rain')) {
      return Colors.blue;
    } else if (condition.contains('storm')) {
      return Colors.deepPurple;
    } else if (condition.contains('snow')) {
      return Colors.lightBlue;
    }
    return null;
  }
}