import 'package:flutter/material.dart';
import '../../core/service_locator.dart';
import '../../core/logger.dart';
import '../../data/recipes/models/bookmark_category_model.dart';

/// Dialog for selecting or creating a bookmark category.
class BookmarkDialog extends StatefulWidget {
  final String recipeId;
  final List<BookmarkCategory> currentCategories;

  const BookmarkDialog({
    super.key,
    required this.recipeId,
    required this.currentCategories,
  });

  @override
  State<BookmarkDialog> createState() => _BookmarkDialogState();
}

class _BookmarkDialogState extends State<BookmarkDialog> {
  final TextEditingController _categoryNameController = TextEditingController();
  List<BookmarkCategory> _allCategories = [];
  bool _isLoading = false;
  bool _isCreating = false;

  @override
  void initState() {
    super.initState();
    _loadCategories();
  }

  @override
  void dispose() {
    _categoryNameController.dispose();
    super.dispose();
  }

  Future<void> _loadCategories() async {
    setState(() => _isLoading = true);
    try {
      final recipeService = ServiceLocator.instance.recipeService;
      if (recipeService != null) {
        final categories = await recipeService.getAllBookmarkCategories();
        setState(() {
          _allCategories = categories;
          _isLoading = false;
        });
      }
    } catch (e) {
      Logger.error('Failed to load bookmark categories', e);
      setState(() => _isLoading = false);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Failed to load bookmarks: $e')),
        );
      }
    }
  }

  Future<void> _createCategory() async {
    final name = _categoryNameController.text.trim();
    if (name.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Bookmark name cannot be empty')),
        );
      }
      return;
    }

    setState(() => _isCreating = true);
    try {
      final recipeService = ServiceLocator.instance.recipeService;
      if (recipeService != null) {
        final category = await recipeService.createBookmarkCategory(name: name);
        await recipeService.addRecipeToCategory(
          recipeId: widget.recipeId,
          categoryId: category.id,
        );
        if (mounted) {
          Navigator.of(context).pop(category);
        }
      }
    } catch (e) {
      Logger.error('Failed to create bookmark category', e);
      setState(() => _isCreating = false);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Failed to create bookmark: $e')),
        );
      }
    }
  }

  Future<void> _selectCategory(BookmarkCategory category) async {
    try {
      final recipeService = ServiceLocator.instance.recipeService;
      if (recipeService != null) {
        final isInCategory = widget.currentCategories
            .any((c) => c.id == category.id);
        
        if (isInCategory) {
          // Remove from category
          await recipeService.removeRecipeFromCategory(
            recipeId: widget.recipeId,
            categoryId: category.id,
          );
        } else {
          // Add to category
          await recipeService.addRecipeToCategory(
            recipeId: widget.recipeId,
            categoryId: category.id,
          );
        }
        if (mounted) {
          Navigator.of(context).pop(category);
        }
      }
    } catch (e) {
      Logger.error('Failed to update bookmark', e);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Failed to update bookmark: $e')),
        );
      }
    }
  }

  Color _parseColor(String hexColor) {
    try {
      return Color(int.parse(hexColor.replaceAll('#', '0xFF')));
    } catch (e) {
      return Colors.blue;
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: const Text('Bookmark Recipe'),
      content: SizedBox(
        width: double.maxFinite,
        child: _isLoading
            ? const Center(child: CircularProgressIndicator())
            : SingleChildScrollView(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    // Existing categories
                    if (_allCategories.isNotEmpty) ...[
                      const Text(
                        'Add to bookmark:',
                        style: TextStyle(fontWeight: FontWeight.bold),
                      ),
                      const SizedBox(height: 8),
                      ConstrainedBox(
                        constraints: const BoxConstraints(maxHeight: 200),
                        child: ListView.builder(
                          shrinkWrap: true,
                          itemCount: _allCategories.length,
                          itemBuilder: (context, index) {
                            final category = _allCategories[index];
                            final isSelected = widget.currentCategories
                                .any((c) => c.id == category.id);
                            return CheckboxListTile(
                              title: Text(category.name),
                              value: isSelected,
                              onChanged: (_) => _selectCategory(category),
                              secondary: category.color != null
                                  ? Container(
                                      width: 24,
                                      height: 24,
                                      decoration: BoxDecoration(
                                        color: _parseColor(category.color!),
                                        shape: BoxShape.circle,
                                      ),
                                    )
                                  : const Icon(Icons.bookmark),
                            );
                          },
                        ),
                      ),
                      const SizedBox(height: 16),
                    ],
                    // Create new category
                    const Text(
                      'Or create new bookmark:',
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const SizedBox(height: 8),
                    TextField(
                      controller: _categoryNameController,
                      decoration: const InputDecoration(
                        hintText: 'Bookmark name',
                        border: OutlineInputBorder(),
                      ),
                      enabled: !_isCreating,
                      onSubmitted: (_) => _createCategory(),
                    ),
                  ],
                ),
              ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('Cancel'),
        ),
        if (!_isLoading)
          TextButton(
            onPressed: _isCreating ? null : _createCategory,
            child: _isCreating
                ? const SizedBox(
                    width: 20,
                    height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  )
                : const Text('Create & Add'),
          ),
      ],
    );
  }
}