import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../core/theme/app_colors.dart';
import '../../../shared/models/recipe.dart';
import '../recipe_provider.dart';

/// Card shown in the recommendations list.
/// Shows the photo, title, nutrition summary, time and difficulty.
/// The ♡ button saves / unsaves the recipe.
class RecipeCard extends ConsumerWidget {
  final Recipe recipe;
  final VoidCallback onTap;

  const RecipeCard({
    super.key,
    required this.recipe,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final savedNotifier = ref.watch(savedRecipesProvider.notifier);
    final isSaved = ref.watch(
      savedRecipesProvider.select(
        (_) => savedNotifier.isSaved(recipe.title),
      ),
    );

    return Card(
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: onTap,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // Photo
            Stack(
              children: [
                _RecipeImage(imageUrl: recipe.imageUrl, title: recipe.title),
                // Save button
                Positioned(
                  top: 8,
                  right: 8,
                  child: _SaveButton(
                    isSaved: isSaved,
                    onPressed: () => _toggleSave(context, ref, isSaved),
                  ),
                ),
              ],
            ),

            // Content
            Padding(
              padding: const EdgeInsets.all(12),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    recipe.title,
                    style: Theme.of(context).textTheme.titleMedium?.copyWith(
                          fontWeight: FontWeight.bold,
                        ),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                  if (recipe.description.isNotEmpty) ...[
                    const SizedBox(height: 4),
                    Text(
                      recipe.description,
                      style: Theme.of(context).textTheme.bodySmall?.copyWith(
                            color: AppColors.textSecondary,
                          ),
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ],
                  const SizedBox(height: 10),
                  _MetaRow(recipe: recipe),
                  if (recipe.nutrition != null) ...[
                    const SizedBox(height: 8),
                    _NutritionRow(nutrition: recipe.nutrition!),
                  ],
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _toggleSave(
    BuildContext context,
    WidgetRef ref,
    bool isSaved,
  ) async {
    HapticFeedback.lightImpact();
    final notifier = ref.read(savedRecipesProvider.notifier);

    if (isSaved) {
      final id = notifier.savedId(recipe.title);
      if (id != null) await notifier.delete(id);
    } else {
      final saved = await notifier.save(recipe);
      if (saved == null && context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Не удалось сохранить рецепт')),
        );
      }
    }
  }
}

class _RecipeImage extends StatelessWidget {
  final String imageUrl;
  final String title;

  const _RecipeImage({required this.imageUrl, required this.title});

  @override
  Widget build(BuildContext context) {
    if (imageUrl.isEmpty) {
      return Container(
        height: 180,
        color: AppColors.primaryLight.withValues(alpha: 0.3),
        child: const Center(child: Icon(Icons.restaurant, size: 48)),
      );
    }
    return CachedNetworkImage(
      imageUrl: imageUrl,
      height: 180,
      width: double.infinity,
      fit: BoxFit.cover,
      placeholder: (_, __) => Container(
        height: 180,
        color: Colors.grey.withValues(alpha: 0.3),
      ),
      errorWidget: (_, __, ___) => Container(
        height: 180,
        color: AppColors.primaryLight.withValues(alpha: 0.3),
        child: const Center(child: Icon(Icons.restaurant, size: 48)),
      ),
    );
  }
}

class _SaveButton extends StatelessWidget {
  final bool isSaved;
  final VoidCallback onPressed;

  const _SaveButton({required this.isSaved, required this.onPressed});

  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.black45,
      borderRadius: BorderRadius.circular(20),
      child: InkWell(
        borderRadius: BorderRadius.circular(20),
        onTap: onPressed,
        child: Padding(
          padding: const EdgeInsets.all(6),
          child: Icon(
            isSaved ? Icons.favorite : Icons.favorite_border,
            color: isSaved ? Colors.red : Colors.white,
            size: 22,
          ),
        ),
      ),
    );
  }
}

class _MetaRow extends StatelessWidget {
  final Recipe recipe;

  const _MetaRow({required this.recipe});

  @override
  Widget build(BuildContext context) {
    final totalMin = recipe.prepTimeMin + recipe.cookTimeMin;
    final style = Theme.of(context).textTheme.bodySmall?.copyWith(
          color: AppColors.textSecondary,
        );

    return Row(
      children: [
        const Icon(Icons.access_time, size: 14, color: AppColors.textSecondary),
        const SizedBox(width: 3),
        Text('$totalMin мин', style: style),
        const SizedBox(width: 12),
        const Icon(Icons.bar_chart, size: 14, color: AppColors.textSecondary),
        const SizedBox(width: 3),
        Text(_difficultyLabel(recipe.difficulty), style: style),
        if (recipe.cuisine.isNotEmpty) ...[
          const SizedBox(width: 12),
          const Icon(Icons.public, size: 14, color: AppColors.textSecondary),
          const SizedBox(width: 3),
          Text(_cuisineLabel(recipe.cuisine), style: style),
        ],
      ],
    );
  }

  String _difficultyLabel(String d) => switch (d) {
        'easy' => 'Легко',
        'medium' => 'Средне',
        'hard' => 'Сложно',
        _ => d,
      };

  String _cuisineLabel(String c) => switch (c) {
        'russian' => 'Русская',
        'asian' => 'Азиатская',
        'european' => 'Европейская',
        'mediterranean' => 'Средиземноморская',
        'american' => 'Американская',
        _ => 'Другая',
      };
}

class _NutritionRow extends StatelessWidget {
  final NutritionInfo nutrition;

  const _NutritionRow({required this.nutrition});

  @override
  Widget build(BuildContext context) {
    final style = Theme.of(context).textTheme.bodySmall?.copyWith(
          color: AppColors.textSecondary,
          fontSize: 11,
        );
    return Row(
      children: [
        Text('≈ ', style: style?.copyWith(color: AppColors.accent)),
        _NutItem(label: 'ккал', value: nutrition.calories.round(), style: style),
        const SizedBox(width: 8),
        _NutItem(label: 'б', value: nutrition.proteinG.round(), style: style),
        const SizedBox(width: 8),
        _NutItem(label: 'ж', value: nutrition.fatG.round(), style: style),
        const SizedBox(width: 8),
        _NutItem(label: 'у', value: nutrition.carbsG.round(), style: style),
      ],
    );
  }
}

class _NutItem extends StatelessWidget {
  final String label;
  final int value;
  final TextStyle? style;

  const _NutItem({required this.label, required this.value, this.style});

  @override
  Widget build(BuildContext context) => Text(
        '$value $label',
        style: style,
      );
}