import 'package:flutter/material.dart';

/// Weather widget displaying current conditions.
///
/// Currently uses mock data. Will be connected to weather API in future.
class WeatherWidget extends StatelessWidget {
  const WeatherWidget({
    super.key,
    this.data,
    this.compact = false,
  });

  /// Weather data to display. Uses mock data if null.
  final WeatherData? data;

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

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final weather = data ?? WeatherData.mock();

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

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            // Header
            Row(
              children: [
                Icon(
                  Icons.wb_sunny_outlined,
                  size: 20,
                  color: colorScheme.onSurfaceVariant,
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    weather.location,
                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
                          color: colorScheme.onSurfaceVariant,
                        ),
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // Main weather display (matching AQI layout)
            Row(
              children: [
                // Weather icon in box (like AQI number box)
                Container(
                  width: 64,
                  height: 64,
                  decoration: BoxDecoration(
                    color: (weather.iconColor ?? colorScheme.primary)
                        .withValues(alpha: 0.15),
                    borderRadius: BorderRadius.circular(12),
                    border: Border.all(
                      color: (weather.iconColor ?? colorScheme.primary)
                          .withValues(alpha: 0.3),
                      width: 2,
                    ),
                  ),
                  child: Center(
                    child: Icon(
                      weather.icon,
                      size: 32,
                      color: weather.iconColor ?? colorScheme.primary,
                    ),
                  ),
                ),
                const SizedBox(width: 16),

                // Temperature and condition
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        '${weather.temperature.round()}°${weather.unit.symbol}',
                        style:
                            Theme.of(context).textTheme.titleMedium?.copyWith(
                                  fontWeight: FontWeight.w600,
                                ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        weather.condition,
                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
                              color: colorScheme.onSurfaceVariant,
                            ),
                        maxLines: 2,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ),
                ),
              ],
            ),

            // Details
            if (weather.humidity != null || weather.windSpeed != null) ...[
              const SizedBox(height: 16),
              const Divider(height: 1),
              const SizedBox(height: 12),
              Wrap(
                spacing: 16,
                runSpacing: 8,
                children: [
                  if (weather.humidity != null)
                    _DetailChip(
                      label: 'Humidity',
                      value: '${weather.humidity}%',
                    ),
                  if (weather.windSpeed != null)
                    _DetailChip(
                      label: 'Wind',
                      value: '${weather.windSpeed!.round()} ${weather.windUnit}',
                    ),
                  if (weather.feelsLike != null)
                    _DetailChip(
                      label: 'Feels',
                      value: '${weather.feelsLike!.round()}°${weather.unit.symbol}',
                    ),
                ],
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildCompact(
    BuildContext context,
    ColorScheme colorScheme,
    WeatherData weather,
  ) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              weather.icon,
              size: 24,
              color: weather.iconColor ?? colorScheme.primary,
            ),
            const SizedBox(width: 8),
            Text(
              '${weather.temperature.round()}°${weather.unit.symbol}',
              style: Theme.of(context).textTheme.titleMedium?.copyWith(
                    fontWeight: FontWeight.bold,
                  ),
            ),
          ],
        ),
      ),
    );
  }
}

class _DetailChip extends StatelessWidget {
  const _DetailChip({
    required this.label,
    required this.value,
  });

  final String label;
  final String value;

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

    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Text(
          label,
          style: Theme.of(context).textTheme.labelSmall?.copyWith(
                color: colorScheme.outline,
              ),
        ),
        const SizedBox(width: 4),
        Text(
          value,
          style: Theme.of(context).textTheme.bodySmall?.copyWith(
                fontWeight: FontWeight.w500,
              ),
        ),
      ],
    );
  }
}

/// Temperature unit for weather display.
enum TemperatureUnit {
  celsius('C'),
  fahrenheit('F');

  const TemperatureUnit(this.symbol);
  final String symbol;
}

/// Weather data model.
class WeatherData {
  const WeatherData({
    required this.location,
    required this.temperature,
    required this.condition,
    required this.icon,
    this.unit = TemperatureUnit.celsius,
    this.humidity,
    this.windSpeed,
    this.windUnit = 'km/h',
    this.feelsLike,
    this.iconColor,
  });

  final String location;
  final double temperature;
  final String condition;
  final IconData icon;
  final TemperatureUnit unit;
  final int? humidity;
  final double? windSpeed;
  final String windUnit;
  final double? feelsLike;
  final Color? iconColor;

  /// Mock weather data for development.
  factory WeatherData.mock() {
    return const WeatherData(
      location: 'Rotterdam, NL',
      temperature: 8,
      condition: 'Partly Cloudy',
      icon: Icons.cloud,
      humidity: 72,
      windSpeed: 18,
      feelsLike: 5,
      iconColor: Colors.blueGrey,
    );
  }
}