using Lattice.Layout.Abstractions;
using Lattice.Layout.UI.WinUI.Controls;
using Lattice.Layout.UI.WinUI.Docking;
using Microsoft.UI.Xaml;
using System.Collections.Generic;

namespace Lattice.Layout.UI.WinUI.Visuals;

/// <summary>
/// Визуальное представление сплит-элемента для WinUI.
/// Управляет жизненным циклом соответствующего <see cref="WinUISplitControl"/>.
/// </summary>
public sealed class WinUISplitVisual : LayoutVisual, IWinUIVisual
{
    /// <summary>
    /// Реальный WinUI-контрол, отображающий сплит.
    /// </summary>
    public WinUISplitControl SplitControl { get; }

    /// <summary>
    /// Контрол, используемый рендерером и докингом.
    /// </summary>
    public FrameworkElement Control => SplitControl;

    /// <summary>
    /// Дочерние визуальные элементы.
    /// </summary>
    public IReadOnlyList<ILayoutVisual> Children { get; }

    public WinUISplitVisual(ILayoutSplit model, IReadOnlyList<ILayoutVisual> children)
        : base(model)
    {
        Children = children;

        SplitControl = new WinUISplitControl
        {
            LayoutOrientation = model.Orientation switch
            {
                Lattice.Layout.Abstractions.Orientation.Horizontal => Microsoft.UI.Xaml.Controls.Orientation.Horizontal,
                Lattice.Layout.Abstractions.Orientation.Vertical => Microsoft.UI.Xaml.Controls.Orientation.Vertical,
                _ => Microsoft.UI.Xaml.Controls.Orientation.Horizontal
            }
        };
    }

    /// <inheritdoc />
    public override void Attach()
    {
        SplitControl.Children.Clear();

        foreach (var child in Children)
        {
            child.Attach();

            switch (child)
            {
                case WinUISplitVisual splitVisual:
                    SplitControl.Children.Add(splitVisual.Control);
                    break;

                case WinUIGroupVisual groupVisual:
                    SplitControl.Children.Add(groupVisual.Control);
                    break;

                case WinUIItemVisual itemVisual:
                    SplitControl.Children.Add(itemVisual.Control);
                    break;
            }
        }

        SplitControl.RebuildGrid();
    }

    /// <inheritdoc />
    public override void Detach()
    {
        foreach (var child in Children)
            child.Detach();

        SplitControl.Children.Clear();
    }
}