create a graphical user interface using a WPF to allow a user to 1. enter an unlimited amount of recipes and store it. the user must enter a recipe name, how many ingredients they want, the quantity and meassurement of each ingredient,the calorie of each ingredient and the food group of the ingredients and then the user should be able to enter how many steps the recipe has and a description of those steps. 2. the user must be able to choose from the recipes that were stored to be displayed and for each recipe the calories of each ingredient should be added up and displayed as the total calories, if the total calories exceed 300 the a warning message must be displayed in red. 3. the user should be able to scale the quantities of the ingredients in each recipe by a factor of 0.5 , 2 or 3 and the new qauntities should be displayed. 4. the user should be able to scale the recipe back to its original quantities and the be able to be displayed. Lastly 5. The user shall be able to filter the list of recipes by:

a. entering the name of an ingredient that must be in the recipe,
b. choosing a food group that must be in the recipe, or
c. selecting a maximum number of calories. Show all the final code
use only 1 main window for all of this

1 answer

Certainly! Below is a complete example of WPF (Windows Presentation Foundation) code to create a graphical user interface meeting your specifications. This example uses C# and XAML to create the main window and several key functionalities:

### MainWindow.xaml
```xml
<Window x:Class="RecipeManager.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Recipe Manager" Height="600" Width="800">
<Grid>

<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>

<StackPanel Grid.Column="0" Margin="10">
<TextBlock Text="Recipe Name:"/>
<TextBox x:Name="RecipeNameTextBox" Margin="0,5"/>
<TextBlock Text="Number of Ingredients:"/>
<TextBox x:Name="NumIngredientsTextBox" Margin="0,5"/>
<TextBlock Text="Ingredient Details:"/>
<DataGrid x:Name="IngredientsDataGrid" AutoGenerateColumns="False" Margin="0,5">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
<DataGridTextColumn Header="Quantity" Binding="{Binding Quantity}"/>
<DataGridTextColumn Header="Measurement" Binding="{Binding Measurement}"/>
<DataGridTextColumn Header="Calories" Binding="{Binding Calories}"/>
<DataGridTextColumn Header="Food Group" Binding="{Binding FoodGroup}"/>
</DataGrid.Columns>
</DataGrid>
<TextBlock Text="Number of Steps:"/>
<TextBox x:Name="NumStepsTextBox" Margin="0,5"/>
<TextBlock Text="Steps Description:"/>
<TextBox x:Name="StepsDescriptionTextBox" Margin="0,5" AcceptsReturn="True" Height="80"/>
<Button x:Name="AddRecipeButton" Content="Add Recipe" Click="AddRecipeButton_Click" Margin="0,10"/>

<TextBlock Text="Filter Options:" FontWeight="Bold" Margin="10,20,0,5"/>
<TextBlock Text="Ingredient Name:"/>
<TextBox x:Name="FilterIngredientTextBox" Margin="0,5"/>
<TextBlock Text="Food Group:"/>
<TextBox x:Name="FilterFoodGroupTextBox" Margin="0,5"/>
<TextBlock Text="Max Calories:"/>
<TextBox x:Name="FilterMaxCaloriesTextBox" Margin="0,5"/>
<Button x:Name="FilterRecipesButton" Content="Filter Recipes" Click="FilterRecipesButton_Click" Margin="0,10"/>
</StackPanel>

<StackPanel Grid.Column="1" Margin="10">
<TextBlock Text="Stored Recipes:" FontWeight="Bold"/>
<ListBox x:Name="RecipeListBox" DisplayMemberPath="Name" Margin="0,5" Height="150" SelectionChanged="RecipeListBox_SelectionChanged"/>

<TextBlock x:Name="SelectedRecipeNameTextBlock" Text="Selected Recipe" FontWeight="Bold" FontSize="14" Margin="0,10"/>
<ListBox x:Name="SelectedRecipeDetailsListBox" Margin="0,5" Height="150"/>

<StackPanel Orientation="Horizontal" Margin="0,10">
<Button x:Name="ScaleToHalfButton" Content="Scale to 0.5" Click="ScaleToHalfButton_Click" Margin="5"/>
<Button x:Name="ScaleToDoubleButton" Content="Scale to 2" Click="ScaleToDoubleButton_Click" Margin="5"/>
<Button x:Name="ScaleToTripleButton" Content="Scale to 3" Click="ScaleToTripleButton_Click" Margin="5"/>
<Button x:Name="ResetScaleButton" Content="Reset Scale" Click="ResetScaleButton_Click" Margin="5"/>
</StackPanel>

<TextBlock x:Name="TotalCaloriesTextBlock" Text="Total Calories: 0" Margin="10,10"/>
<TextBlock x:Name="WarningTextBlock" Foreground="Red" FontWeight="Bold"/>
</StackPanel>
</Grid>
</Window>
```

### MainWindow.xaml.cs
```csharp
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace RecipeManager
{
public partial class MainWindow : Window
{
private List<Recipe> recipes = new List<Recipe>();
private Recipe currentSelectedRecipe;
private double currentScaleFactor = 1.0;

public MainWindow()
{
InitializeComponent();
}

private void AddRecipeButton_Click(object sender, RoutedEventArgs e)
{
try
{
var recipe = new Recipe
{
Name = RecipeNameTextBox.Text,
Ingredients = new List<Ingredient>(),
Steps = StepsDescriptionTextBox.Text.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries).ToList()
};

int numIngredients = int.Parse(NumIngredientsTextBox.Text);
var data = IngredientsDataGrid.ItemsSource as List<IngredientDetails>;
if (data != null && data.Count == numIngredients)
{
foreach (var item in data)
{
recipe.Ingredients.Add(new Ingredient
{
Name = item.Name,
Quantity = double.Parse(item.Quantity),
Measurement = item.Measurement,
Calories = double.Parse(item.Calories),
FoodGroup = item.FoodGroup
});
}

recipes.Add(recipe);
RecipeListBox.Items.Add(recipe);

RecipeNameTextBox.Clear();
NumIngredientsTextBox.Clear();
StepsDescriptionTextBox.Clear();
IngredientsDataGrid.ItemsSource = new List<IngredientDetails>();
}
else
{
MessageBox.Show("Number of ingredients does not match the details provided.");
}
}
catch (Exception ex)
{
MessageBox.Show($"Error adding recipe: {ex.Message}");
}
}

private void RecipeListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (RecipeListBox.SelectedItem is Recipe selectedRecipe)
{
currentSelectedRecipe = selectedRecipe;
DisplaySelectedRecipeDetails(selectedRecipe, 1.0);
}
}

private void DisplaySelectedRecipeDetails(Recipe recipe, double scaleFactor)
{
SelectedRecipeNameTextBlock.Text = recipe.Name;
SelectedRecipeDetailsListBox.Items.Clear();

foreach (var ingredient in recipe.Ingredients)
{
SelectedRecipeDetailsListBox.Items.Add($"{ingredient.Name} - {ingredient.Quantity * scaleFactor} {ingredient.Measurement}, {ingredient.Calories} calories, {ingredient.FoodGroup}");
}

double totalCalories = recipe.Ingredients.Sum(ing => ing.Calories);
TotalCaloriesTextBlock.Text = $"Total Calories: {totalCalories * scaleFactor}";
WarningTextBlock.Text = (totalCalories * scaleFactor) > 300 ? "Warning: High Calories!" : string.Empty;
}

private void ScaleToHalfButton_Click(object sender, RoutedEventArgs e)
{
currentScaleFactor = 0.5;
DisplaySelectedRecipeDetails(currentSelectedRecipe, currentScaleFactor);
}

private void ScaleToDoubleButton_Click(object sender, RoutedEventArgs e)
{
currentScaleFactor = 2.0;
DisplaySelectedRecipeDetails(currentSelectedRecipe, currentScaleFactor);
}

private void ScaleToTripleButton_Click(object sender, RoutedEventArgs e)
{
currentScaleFactor = 3.0;
DisplaySelectedRecipeDetails(currentSelectedRecipe, currentScaleFactor);
}

private void ResetScaleButton_Click(object sender, RoutedEventArgs e)
{
currentScaleFactor = 1.0;
DisplaySelectedRecipeDetails(currentSelectedRecipe, currentScaleFactor);
}

private void FilterRecipesButton_Click(object sender, RoutedEventArgs e)
{
var filteredRecipes = recipes.AsEnumerable();

if (!string.IsNullOrWhiteSpace(FilterIngredientTextBox.Text))
{
filteredRecipes = filteredRecipes.Where(r => r.Ingredients.Any(i => i.Name.Contains(FilterIngredientTextBox.Text, StringComparison.OrdinalIgnoreCase)));
}

if (!string.IsNullOrWhiteSpace(FilterFoodGroupTextBox.Text))
{
filteredRecipes = filteredRecipes.Where(r => r.Ingredients.Any(i => i.FoodGroup.Equals(FilterFoodGroupTextBox.Text, StringComparison.OrdinalIgnoreCase)));
}

if (int.TryParse(FilterMaxCaloriesTextBox.Text, out int maxCalories))
{
filteredRecipes = filteredRecipes.Where(r => r.Ingredients.Sum(i => i.Calories) <= maxCalories);
}

RecipeListBox.ItemsSource = filteredRecipes.ToList();
}
}

public class Recipe
{
public string Name { get; set; }
public List<Ingredient> Ingredients { get; set; }
public List<string> Steps { get; set; }

public override string ToString() => Name;
}

public class Ingredient
{
public string Name { get; set; }
public double Quantity { get; set; }
public string Measurement { get; set; }
public double Calories { get; set; }
public string FoodGroup { get; set; }
}

public class IngredientDetails
{
public string Name { get; set; }
public string Quantity { get; set; }
public string Measurement { get; set; }
public string Calories { get; set; }
public string FoodGroup { get; set; }
}
}
```

### Notes:
1. This application allows a user to enter recipes with their ingredients and steps, choose and display stored recipes, scale ingredient quantities, and filter recipes based on specified criteria.
2. It uses a `DataGrid` to enter ingredient details dynamically.
3. The `AddRecipeButton_Click` method captures the recipe information and stores it.
4. The `RecipeListBox_SelectionChanged` method displays the details of the selected recipe.
5. The scaling functionality can adjust ingredient quantities by specific factors and reset them to their original values.
6. The filter functionality allows the user to filter recipes based on ingredient name, food group, or maximum calories.

Ensure you handle any additional validation or exception scenarios as required for a production environment. This example aims to provide the core functionalities as specified in your requirements.