using Microsoft.UI.Composition;
using Microsoft.UI.Xaml.Media;
using Microsoft.UI.Xaml.Navigation;
using SpaceEngineersBlueprintEditor.Model;
using SpaceEngineersBlueprintEditor.ViewModels;

namespace SpaceEngineersBlueprintEditor.Views;

/// <summary>
/// 蓝图编辑页的详细页
/// </summary>
public sealed partial class BlueprintEditSubPage : Page
{
    public BlueprintEditSubPageViewModel ViewModel { get; set; } = new();

    public BlueprintEditSubPage()
    {
        this.InitializeComponent();
        var compositor = CompositionTarget.GetCompositorForCurrentThread();
        NavigationCacheMode = NavigationCacheMode.Required;
        ViewModel.BlueprintTreeViewService.Initialize(blueprintPropertyTreeView);
        ViewModel.CubeBlockTreeViewService.Initialize(cubePropertyTreeView);
        ViewModel.ListViewDisplayService.Initialize(this, cubeGridsListView);
        ViewModel.FileDropService.Initialize(blueprintDragGrid, compositor);
        ViewModel.SelectorBarService.Initialize(selectorBar);
        ViewModel.AutoNavigationParameterService.Initialize(this);
        var expressionAnimation = compositor.CreateExpressionAnimation();
        expressionAnimation.Expression = "(dragElement.Scale.Y - 1) * 200";
        expressionAnimation.Target = "Translation.Y";
        expressionAnimation.SetExpressionReferenceParameter("dragElement", blueprintDragGrid);
        viewBlueprintsList.StartAnimation(expressionAnimation);
        openLocalFile.StartAnimation(expressionAnimation);
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);
        ViewModel.AutoNavigationParameterService.OnParameterChange(e.Parameter);
    }

    protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        base.OnNavigatingFrom(e);
        if (e.SourcePageType != typeof(BlueprintEditSubPage))
            ViewModel.BackgroundImageService?.ResetBackground();
    }

    private static void GetTreeNodes(TreeViewNode treeViewNode)
    {
        if (treeViewNode.Content is BlueprintPropertyViewData blueprintPropertyViewData && treeViewNode.HasUnrealizedChildren)
        {
            SpaceEngineersHelper.AnalyzeBlueprint(blueprintPropertyViewData);
            if (blueprintPropertyViewData.Children.Count == 0)
                return;
            foreach (var child in blueprintPropertyViewData.Children)
            {
                treeViewNode.Children.Add(new TreeViewNode
                {
                    Content = child,
                    HasUnrealizedChildren = child.CanExpand
                });
            }
            treeViewNode.HasUnrealizedChildren = false;
        }
    }

    private void TreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args) => GetTreeNodes(args.Node);

    private void TreeView_Collapsed(TreeView sender, TreeViewCollapsedEventArgs args)
    {
        args.Node.Children.Clear();
        args.Node.HasUnrealizedChildren =
            args.Node.Content is BlueprintPropertyViewData property && property.CanExpand;
    }
}