PIbd-31_Zhirnova_A_E_PMD/lib/main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Рецепты',
      theme: ThemeData(
        scaffoldBackgroundColor: Colors.purple[100],
      ),
      home: RecipeHome(),
    );
  }
}

enum Cuisine { Italian, Indian, Chinese, Georgian }

class Recipe {
  String name;
  Cuisine cuisine;
  List<String> ingredients;

  Recipe({required this.name, required this.cuisine, required this.ingredients});

  String getDetails() {
    return 'Рецепт: $name\nКухня: ${cuisine.toString().split('.').last}\nИнгредиенты: ${ingredients.join(', ')}';
  }
}

class RecipeManager<T extends Recipe> {
  List<T> _recipes = [];

  Future<void> addRecipe(T recipe) async {
    await Future.delayed(Duration(seconds: 1)); // Имитация асинхронной операции
    _recipes.add(recipe);
  }

  List<T> getAllRecipes() => _recipes;

  T? getRecipeAt(int index) {
    if (index < _recipes.length) {
      return _recipes[index];
    }
    return null; // Вернём null, если индекс вне диапазона
  }
}

extension RecipeListExtension<T extends Recipe> on List<T> {
  void printAllRecipes() {
    for (var recipe in this) {
      print(recipe.getDetails());
    }
  }
}

class RecipeHome extends StatefulWidget {
  @override
  _RecipeHomeState createState() => _RecipeHomeState();
}

class _RecipeHomeState extends State<RecipeHome> {
  final RecipeManager<Recipe> _recipeManager = RecipeManager();
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _ingredientsController = TextEditingController();
  Cuisine? _selectedCuisine;

  void _addRecipe() {
    final name = _nameController.text;
    final ingredients = _ingredientsController.text.split(',').map((s) => s.trim()).toList();

    if (name.isNotEmpty && ingredients.isNotEmpty && _selectedCuisine != null) {
      final recipe = Recipe(name: name, cuisine: _selectedCuisine!, ingredients: ingredients);
      _recipeManager.addRecipe(recipe).then((_) {
        _nameController.clear();
        _ingredientsController.clear();
        _selectedCuisine = null;
        setState(() {}); // Обновляем интерфейс
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Создание Рецептов')),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _nameController,
              decoration: InputDecoration(labelText: 'Название рецепта'),
            ),
            DropdownButton<Cuisine>(
              hint: Text('Выберите кухню'),
              value: _selectedCuisine,
              onChanged: (Cuisine? newValue) {
                setState(() {
                  _selectedCuisine = newValue;
                });
              },
              items: Cuisine.values.map((Cuisine cuisine) {
                return DropdownMenuItem<Cuisine>(
                  value: cuisine,
                  child: Text(cuisine.toString().split('.').last),
                );
              }).toList(),
            ),
            TextField(
              controller: _ingredientsController,
              decoration: InputDecoration(labelText: 'Ингредиенты (через запятую)'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _addRecipe,
              child: Text('Добавить Рецепт'),
            ),
            SizedBox(height: 20),
            Expanded(
              child: ListView.builder(
                itemCount: _recipeManager.getAllRecipes().length,
                itemBuilder: (context, index) {
                  final recipe = _recipeManager.getRecipeAt(index);
                  return ListTile(
                    title: Text(recipe?.name ?? 'Имеется ошибка'),
                    subtitle: Text(recipe?.getDetails() ?? ''),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}