using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;

namespace SSPCTester.UI.Views;

public partial class SettingsManualView : UserControl
{
    public SettingsManualView() => InitializeComponent();

    private void SaveSettingsClicked(object sender, RoutedEventArgs e)
    {
        if (!IsLoaded) return;
        CommitAllBindings();
        if (DataContext is ViewModels.SettingsViewModel vm)
            vm.NotifyDraftChanged();
    }

    private void DraftChanged(object sender, RoutedEventArgs e)
    {
        if (!IsLoaded) return;
        UpdateBindingSource(sender);
        if (DataContext is ViewModels.SettingsViewModel vm)
            vm.NotifyDraftChanged();
    }

    private static void UpdateBindingSource(object sender)
    {
        if (sender is ComboBox comboBox)
        {
            comboBox.GetBindingExpression(Selector.SelectedValueProperty)?.UpdateSource();
            comboBox.GetBindingExpression(Selector.SelectedItemProperty)?.UpdateSource();
            comboBox.GetBindingExpression(ComboBox.TextProperty)?.UpdateSource();
        }
        else if (sender is TextBox textBox)
        {
            textBox.GetBindingExpression(TextBox.TextProperty)?.UpdateSource();
        }
        else if (sender is ToggleButton toggleButton)
        {
            toggleButton.GetBindingExpression(ToggleButton.IsCheckedProperty)?.UpdateSource();
        }
    }

    private void CommitAllBindings()
    {
        // Ensure the currently focused editor pushes its latest value first.
        if (Keyboard.FocusedElement is FrameworkElement focused)
            UpdateFrameworkElementBindings(focused);

        foreach (var element in EnumerateVisuals(this).OfType<FrameworkElement>())
            UpdateFrameworkElementBindings(element);
    }

    private static IEnumerable<DependencyObject> EnumerateVisuals(DependencyObject root)
    {
        int count = VisualTreeHelper.GetChildrenCount(root);
        for (int i = 0; i < count; i++)
        {
            var child = VisualTreeHelper.GetChild(root, i);
            yield return child;
            foreach (var nested in EnumerateVisuals(child))
                yield return nested;
        }
    }

    private static void UpdateFrameworkElementBindings(FrameworkElement element)
    {
        switch (element)
        {
            case TextBox textBox:
                textBox.GetBindingExpression(TextBox.TextProperty)?.UpdateSource();
                break;
            case ComboBox comboBox:
                comboBox.GetBindingExpression(Selector.SelectedValueProperty)?.UpdateSource();
                comboBox.GetBindingExpression(Selector.SelectedItemProperty)?.UpdateSource();
                comboBox.GetBindingExpression(ComboBox.TextProperty)?.UpdateSource();
                break;
            case ToggleButton toggleButton:
                toggleButton.GetBindingExpression(ToggleButton.IsCheckedProperty)?.UpdateSource();
                break;
            default:
                if (element is Selector selector)
                {
                    selector.GetBindingExpression(Selector.SelectedValueProperty)?.UpdateSource();
                    selector.GetBindingExpression(Selector.SelectedItemProperty)?.UpdateSource();
                }
                break;
        }

        if (element.BindingGroup != null)
            element.BindingGroup.UpdateSources();
    }
}