import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../../../core/api/api_error_mapper.dart';
import '../../../core/l10n/l10n.dart';
import '../../../core/ui/async_state_views.dart';
import '../data/recipe_providers.dart';
import '../data/recipes_grid_provider.dart';
import '../domain/recipe.dart';

class RecipesScreen extends ConsumerWidget {
  const RecipesScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final recipesAsync = ref.watch(recipesProvider);
    final view = ref.watch(recipesViewProvider).maybeWhen(
          data: (v) => v,
          orElse: () => (mode: RecipesViewMode.grid, columns: 2),
        );

    return Stack(
      children: [
        recipesAsync.when(
          loading: () => LoadingStateView(label: context.l10n.recipesLoading),
          error: (error, _) => ErrorStateView(
            message: mapErrorToUserMessage(error, context),
            onRetry: () => ref.invalidate(recipesProvider),
          ),
          data: (recipes) {
            if (recipes.isEmpty) {
              return EmptyStateView(
                title: context.l10n.recipesEmpty,
                description: context.l10n.recipesEmptyDescription,
              );
            }

            if (view.mode == RecipesViewMode.grid) {
              return GridView.builder(
                padding: const EdgeInsets.only(bottom: 88),
                gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                  crossAxisCount: view.columns,
                  crossAxisSpacing: 4,
                  mainAxisSpacing: 4,
                ),
                itemCount: recipes.length,
                itemBuilder: (context, index) {
                  final recipe = recipes[index];
                  return GestureDetector(
                    onTap: () => context.push('/recipes/${recipe.id}'),
                    child: _RecipeImageCard(recipe: recipe),
                  );
                },
              );
            } else {
              return ListView.builder(
                padding: const EdgeInsets.only(bottom: 88),
                itemCount: recipes.length,
                itemBuilder: (context, index) {
                  final recipe = recipes[index];
                  return InkWell(
                    onTap: () => context.push('/recipes/${recipe.id}'),
                    child: Padding(
                      padding: const EdgeInsets.symmetric(
                          horizontal: 12, vertical: 6),
                      child: Row(
                        children: [
                          ClipRRect(
                            borderRadius: BorderRadius.circular(6),
                            child: SizedBox(
                              width: 72,
                              height: 72,
                              child: _RecipeImageCard(recipe: recipe, compact: true),
                            ),
                          ),
                          const SizedBox(width: 12),
                          Expanded(
                            child: Text(
                              recipe.title,
                              style: Theme.of(context).textTheme.titleMedium,
                              maxLines: 2,
                              overflow: TextOverflow.ellipsis,
                            ),
                          ),
                        ],
                      ),
                    ),
                  );
                },
              );
            }
          },
        ),
        Positioned(
          right: 16,
          bottom: 16,
          child: FloatingActionButton(
            tooltip: context.l10n.recipesNewTooltip,
            onPressed: () => context.push('/recipes/create'),
            child: const Icon(Icons.add),
          ),
        ),
      ],
    );
  }
}

class _RecipeImageCard extends StatelessWidget {
  final Recipe recipe;
  final bool compact;

  const _RecipeImageCard({required this.recipe, this.compact = false});

  @override
  Widget build(BuildContext context) {
    final showStamp = recipe.isPublic == true &&
        recipe.ownerUsername != null &&
        recipe.ownerUsername.toString().isNotEmpty;
    final radius = compact ? 0.0 : 8.0;

    return Container(
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(radius),
        color: Colors.grey[200],
        image: recipe.imageUrl != null
            ? DecorationImage(
                image: NetworkImage(recipe.imageUrl!),
                fit: BoxFit.cover,
              )
            : null,
      ),
      child: Stack(
        children: [
          if (recipe.imageUrl == null)
            const Center(child: Icon(Icons.restaurant, size: 32)),
          if (showStamp)
            Positioned(
              right: 4,
              bottom: 4,
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
                decoration: BoxDecoration(
                  color: Colors.black.withOpacity(0.45),
                  borderRadius: BorderRadius.circular(10),
                ),
                child: Text(
                  '@${recipe.ownerUsername}',
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: compact ? 8 : 10,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }
}