using System;
using System.Windows;
using System.Windows.Controls;
using HandyControl.Data;

namespace HandyControl.Controls;

public class ScrollViewerAttach
{
    public static readonly DependencyProperty AutoHideProperty = DependencyProperty.RegisterAttached(
        "AutoHide", typeof(bool), typeof(ScrollViewerAttach), new FrameworkPropertyMetadata(ValueBoxes.TrueBox, FrameworkPropertyMetadataOptions.Inherits));

    public static void SetAutoHide(DependencyObject element, bool value)
        => element.SetValue(AutoHideProperty, ValueBoxes.BooleanBox(value));

    public static bool GetAutoHide(DependencyObject element)
        => (bool) element.GetValue(AutoHideProperty);

    public static readonly DependencyProperty OrientationProperty = DependencyProperty.RegisterAttached(
        "Orientation", typeof(Orientation), typeof(ScrollViewerAttach), new FrameworkPropertyMetadata(ValueBoxes.VerticalBox, FrameworkPropertyMetadataOptions.Inherits, OnOrientationChanged));

    private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is ScrollViewer)
        {
            return;
        }

        if (d is System.Windows.Controls.ScrollViewer scrollViewer)
        {
            if ((Orientation) e.NewValue == Orientation.Horizontal)
            {
                scrollViewer.PreviewMouseWheel += ScrollViewer_PreviewMouseWheel;
            }
            else
            {
                scrollViewer.PreviewMouseWheel -= ScrollViewer_PreviewMouseWheel;
            }
        }
    }

    private static void ScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
    {
        var scrollViewer = (System.Windows.Controls.ScrollViewer) sender;
        scrollViewer.ScrollToHorizontalOffset(Math.Min(Math.Max(0, scrollViewer.HorizontalOffset - e.Delta), scrollViewer.ScrollableWidth));

        e.Handled = true;
    }

    public static void SetOrientation(DependencyObject element, Orientation value)
        => element.SetValue(OrientationProperty, ValueBoxes.OrientationBox(value));

    public static Orientation GetOrientation(DependencyObject element)
        => (Orientation) element.GetValue(OrientationProperty);
}