using Lattice.Layout.Abstractions;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Media;
using Windows.Foundation;

namespace Lattice.Layout.UI.WinUI.Docking;

/// <summary>
/// Полупрозрачная подсветка зоны докинга.
/// </summary>
public sealed class DockOverlay : Control
{
    public static readonly DependencyProperty ZoneProperty =
        DependencyProperty.Register(
            nameof(Zone),
            typeof(DockZone),
            typeof(DockOverlay),
            new PropertyMetadata(DockZone.Center, OnVisualPropertyChanged));

    public static readonly DependencyProperty BoundsProperty =
        DependencyProperty.Register(
            nameof(Bounds),
            typeof(Rect),
            typeof(DockOverlay),
            new PropertyMetadata(Rect.Empty, OnVisualPropertyChanged));

    /// <summary>
    /// Зона докинга, которую нужно подсветить.
    /// </summary>
    public DockZone Zone
    {
        get => (DockZone)GetValue(ZoneProperty);
        set => SetValue(ZoneProperty, value);
    }

    /// <summary>
    /// Прямоугольник зоны в координатах родительского контейнера.
    /// </summary>
    public Rect Bounds
    {
        get => (Rect)GetValue(BoundsProperty);
        set => SetValue(BoundsProperty, value);
    }

    private Border? _border;

    public DockOverlay()
    {
        IsHitTestVisible = false;
        DefaultStyleKey = typeof(DockOverlay);
    }

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        _border = GetTemplateChild("PART_Border") as Border;
        UpdateVisual();
    }

    private static void OnVisualPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is DockOverlay overlay)
        {
            overlay.UpdateVisual();
        }
    }

    private void UpdateVisual()
    {
        if (_border is null)
            return;

        Canvas.SetLeft(this, Bounds.X);
        Canvas.SetTop(this, Bounds.Y);
        Width = Bounds.Width;
        Height = Bounds.Height;

        _border.BorderBrush = new SolidColorBrush(Microsoft.UI.Colors.DeepSkyBlue);
        _border.BorderThickness = new Thickness(2);
        _border.Background = new SolidColorBrush(Microsoft.UI.Colors.LightSkyBlue) { Opacity = 0.25 };
    }
}