using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using SSPCTester.UI.ViewModels;

namespace SSPCTester.UI.Views;

public partial class SettingsView : UserControl
{
    public SettingsView() { InitializeComponent(); }

    private async void SettingChanged(object sender, RoutedEventArgs e)
    {
        UpdateBindingSource(sender);
        if (DataContext is ViewModels.SettingsViewModel vm)
        {
            vm.NotifyDaqSettingsChanged();
            try { await vm.SaveSettingsAsync(); }
            catch { vm.ScheduleSave(); }
        }
    }

    private void DaqRoleChanged(object sender, SelectionChangedEventArgs e)
    {
        if (sender is ComboBox { DataContext: DaqChannelEditor editor, SelectedItem: string role }
            && editor.Role != role)
        {
            editor.Role = role;
        }
        SettingChanged(sender, e);
    }

    private void DaqCalibrationChanged(object sender, RoutedEventArgs e)
    {
        if (sender is CheckBox { DataContext: DaqChannelEditor editor } checkBox)
            editor.IsCalibrated = checkBox.IsChecked == true;
        SettingChanged(sender, e);
    }

    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();
        }
        else if (sender is FrameworkElement element)
        {
            foreach (var child in FindVisualChildren<FrameworkElement>(element))
                UpdateBindingSource(child);
        }
    }

    private static IEnumerable<T> FindVisualChildren<T>(DependencyObject parent) where T : DependencyObject
    {
        for (int i = 0; i < System.Windows.Media.VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var child = System.Windows.Media.VisualTreeHelper.GetChild(parent, i);
            if (child is T typed) yield return typed;
            foreach (var descendant in FindVisualChildren<T>(child))
                yield return descendant;
        }
    }
}