Refactor application structure and add unit tests

Added:
- New `ProgressService` class for managing progress indicators.
- New `AssetDatabase`, `AssetOpenHandlerAttribute`, and `AsyncAssetOpenHandlerAttribute` classes for asset handling.
- `Ghost.UnitTest` project for unit testing with associated files and configurations.

Changed:
- `ActivationHandler` class to ensure correct handling of `LaunchActivatedEventArgs`.
- `App.xaml.cs` to register `INotificationService` and `IProgressService`, replacing `StackedNotificationService`.
- `OnLaunched` method in `App.xaml.cs` to correctly call `ActivationHandler.Handle(args)` and start the host.
- `INavigationAware` interface from internal to public for broader access.
- `EditorState.cs` to activate `EditorApplication` with the current service provider.
- Property names in `AssetItem` and `ExplorerItem` structs to `Name` and `FullName`.
- `NotificationService` class to implement `INotificationService` and refactor notification handling.
- `AssetPathToGlyphConverter` to handle file extensions consistently.
- Bindings in `ProjectPage.xaml` and `ProjectPage.xaml.cs` to use `FullName` instead of `Path`.
- `EngineEditorWindow` and `LandingWindow` classes to utilize new notification and progress services.
- `Logger` class to include a new method for logging errors with exceptions.

Updated:
- Manifest files and project files to reflect new structure and dependencies.
- Solution file `GhostEngine.sln` to include the new unit test project.
- Added several new test classes and methods in `UnitTests.cs`.

Ghost.App/ActivationHandler.cs

@@ -25,4 +25,4 @@ internal static class ActivationHandler
         FolderInitialization();
         ProjectService.EnsureDefaultTemplate();
     }
-}
+}

Ghost.App/App.xaml.cs

@@ -1,6 +1,8 @@
 using Ghost.App.Infrastructures.AppState;
 using Ghost.App.Services;
 using Ghost.App.Utilities;
+using Ghost.Editor.Services.Contracts;
+using Ghost.Engine.Services;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.UI.Xaml;
@@ -52,7 +54,8 @@ public partial class GhostApplication : Application
                 HostHelper.AddEngineScope(context, services);
 
                 services.AddSingleton<AppStateMachine>();
-                services.AddSingleton<StackedNotificationService>();
+                services.AddSingleton<INotificationService, NotificationService>();
+                services.AddSingleton<IProgressService, ProgressService>();
             })
             .Build();
 
@@ -82,9 +85,8 @@ public partial class GhostApplication : Application
     {
         base.OnLaunched(args);
 
-        ActivationHandler.Handle(args);
-
         Host.Start();
+        ActivationHandler.Handle(args);
 
         var stateMachine = GetService<AppStateMachine>();
         stateMachine.RegisterState(StateKey.Landing, () => new LandingState());
@@ -95,7 +97,6 @@ public partial class GhostApplication : Application
 
     private void App_UnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs e)
     {
-        // TODO: Log and handle exceptions as appropriate.
+        Logger.LogError(e.Exception);
-        // https://docs.microsoft.com/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.application.unhandledexception.
     }
 }

Ghost.App/Contracts/INavigationAware.cs

@@ -1,6 +1,6 @@
 namespace Ghost.App.Contracts;
 
-internal interface INavigationAware
+public interface INavigationAware
 {
     public void OnNavigatedTo(object? parameter);
     public void OnNavigatedFrom();

Ghost.App/Infrastructures/AppState/EditorState.cs

@@ -1,7 +1,9 @@
 using Ghost.App.View.Windows;
 using Ghost.Data.Models;
 using Ghost.Data.Services;
+using Ghost.Editor;
 using Ghost.Engine;
+using Microsoft.UI.Xaml;
 using System;
 using System.Threading.Tasks;
 
@@ -57,6 +59,7 @@ internal class EditorState : IAppState
 
     public Task OnEnteredAsync(object? parameter)
     {
+        EditorApplication.Activate(parameter, ((GhostApplication)(Application.Current)).Host.Services);
         return Task.CompletedTask;
     }
 }

Ghost.App/Models/AssetItem.cs

@@ -2,12 +2,12 @@
 
 internal struct AssetItem()
 {
-    public string AssetPath
+    public string Name
     {
         get; set;
     } = string.Empty;
 
-    public string AssetName
+    public string FullNam
     {
         get; set;
     } = string.Empty;

Ghost.App/Models/ExplorerItem.cs

@@ -9,7 +9,7 @@ internal class ExplorerItem(string name, string path, bool isDirectory)
         get;
     } = name;
 
-    public string Path
+    public string FullName
     {
         get;
     } = path;

Ghost.App/Services/NotificationService.cs

@@ -1,10 +1,12 @@
 using CommunityToolkit.WinUI.Behaviors;
+using Ghost.Editor.Models;
+using Ghost.Editor.Services.Contracts;
 using Microsoft.UI.Xaml.Controls;
 using System;
 
 namespace Ghost.App.Services;
 
-public class StackedNotificationService
+public class NotificationService : INotificationService
 {
     private InfoBar? _infoBar;
     private StackedNotificationsBehavior? _notificationQueue;
@@ -15,17 +17,7 @@ public class StackedNotificationService
         _notificationQueue = notificationQueue;
     }
 
-    internal void ClearReference()
+    public void ShowNotification(string? message, MessageType type, int duration = 5, string? title = null)
-    {
-        if (_infoBar != null)
-        {
-            _infoBar.IsOpen = false;
-        }
-        _infoBar = null;
-        _notificationQueue = null;
-    }
-
-    public void ShowNotification(string? message, InfoBarSeverity severity, int duration = 5, string? title = null)
     {
         if (string.IsNullOrWhiteSpace(message))
         {
@@ -35,7 +27,7 @@ public class StackedNotificationService
         var notification = new Notification
         {
             Message = message,
-            Severity = severity,
+            Severity = (InfoBarSeverity)type,
             Duration = TimeSpan.FromSeconds(duration),
             Title = title
         };
@@ -47,4 +39,14 @@ public class StackedNotificationService
     {
         _notificationQueue?.Show(notification);
     }
+
+    internal void ClearReference()
+    {
+        if (_infoBar != null)
+        {
+            _infoBar.IsOpen = false;
+        }
+        _infoBar = null;
+        _notificationQueue = null;
+    }
 }

Ghost.App/Services/ProgressService.cs

@@ -0,0 +1,75 @@
+using CommunityToolkit.WinUI;
+using Ghost.Editor.Services.Contracts;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.App.Services;
+
+public class ProgressService : IProgressService
+{
+    private Grid? _progressBarContainer;
+    private TextBlock? _progressMessage;
+    private ProgressBar? _progressBar;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private bool IsInitialized()
+    {
+        return _progressBarContainer != null && _progressMessage != null && _progressBar != null;
+    }
+
+    internal void SetReference(Grid progressBarContainer)
+    {
+        _progressBarContainer = progressBarContainer;
+        _progressMessage = _progressBarContainer.FindChild<TextBlock>();
+        _progressBar = _progressBarContainer.FindChild<ProgressBar>();
+    }
+
+    public void ShowProgress(string message, double progress = 0.0)
+    {
+        if (!IsInitialized())
+        {
+            return;
+        }
+
+        _progressBarContainer!.Visibility = Visibility.Visible;
+        _progressMessage!.Text = message;
+        _progressBar!.Value = progress;
+    }
+
+    public void ShowIndeterminateProgress(string message)
+    {
+        if (!IsInitialized())
+        {
+            return;
+        }
+
+        _progressBarContainer!.Visibility = Visibility.Visible;
+        _progressMessage!.Text = message;
+        _progressBar!.IsIndeterminate = true;
+    }
+
+    public void SetProgress(double progress)
+    {
+        _progressBar!.Value = progress;
+    }
+
+    public void HideProgress()
+    {
+        if (!IsInitialized())
+        {
+            return;
+        }
+
+        _progressBarContainer!.Visibility = Visibility.Collapsed;
+        _progressMessage!.Text = string.Empty;
+        _progressBar!.Value = 0.0;
+    }
+
+    internal void ClearReference()
+    {
+        _progressBarContainer = null;
+        _progressMessage = null;
+        _progressBar = null;
+    }
+}

Ghost.App/Utilities/Converters/AssetPathToGlyphConverter.cs

@@ -23,13 +23,14 @@ public partial class AssetPathToGlyphConverter : IValueConverter
         // TODO: Use resource dictionary for icons.
         return extension switch
         {
+            ".ghostscene" => "\uF159",
             ".fbx" or ".obj" => "\uF158",
-            ".png" or ".jpg" or ".jpeg" or ".gif" or ".bmp" => "\uE91B", // Image icon
+            ".png" or ".jpg" or ".jpeg" or ".gif" or ".bmp" => "\uE91B",
-            ".mp3" or ".wav" or ".ogg" => "\uE767", // Audio icon
+            ".mp3" or ".wav" or ".ogg" => "\uE767",
-            ".mp4" or ".avi" or ".mkv" => "\uE714", // Video icon
+            ".mp4" or ".avi" or ".mkv" => "\uE714",
-            ".txt" or ".md" => "\uF000", // Text file icon
+            ".txt" or ".md" => "\uF000",
-            ".cs" or ".hlsl" => "\uE943", // Code file icon
+            ".cs" or ".hlsl" => "\uE943",
-            _ => "\uE8A5", // Default file icon
+            _ => "\uE8A5",
         };
     }
 

Ghost.App/View/Pages/EngineEditor/ProjectPage.xaml

@@ -105,7 +105,7 @@
                                     <RowDefinition Height="*" />
                                     <RowDefinition Height="0.25*" />
                                 </Grid.RowDefinitions>
-                                <FontIcon FontSize="42" Glyph="{x:Bind Path, Converter={StaticResource AssetPathToGlyphConverter}}" />
+                                <FontIcon FontSize="42" Glyph="{x:Bind FullName, Converter={StaticResource AssetPathToGlyphConverter}}" />
                                 <TextBlock
                                     Grid.Row="1"
                                     Margin="8,0"
@@ -132,7 +132,7 @@
                     VerticalAlignment="Center"
                     HorizontalTextAlignment="Left"
                     Style="{StaticResource CaptionTextBlockStyle}"
-                    Text="{x:Bind ViewModel.SelectedAsset.Path, Mode=OneWay}"
+                    Text="{x:Bind ViewModel.SelectedAsset.FullName, Mode=OneWay}"
                     TextTrimming="CharacterEllipsis" />
             </Grid>
         </Grid>

Ghost.App/View/Pages/EngineEditor/ProjectPage.xaml.cs

@@ -18,8 +18,8 @@ internal sealed partial class ProjectPage : Page
         InitializeComponent();
     }
 
-    private void GridViewItem_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
+    private async void GridViewItem_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
     {
-        ViewModel.NavigateToSelected();
+        await ViewModel.OpenSelected();
     }
-}
+}

Ghost.App/View/Windows/EngineEditorWindow.xaml

@@ -3,13 +3,16 @@
     x:Class="Ghost.App.View.Windows.EngineEditorWindow"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:behaviors="using:CommunityToolkit.WinUI.Behaviors"
     xmlns:controls="using:CommunityToolkit.WinUI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:ee="using:Ghost.App.View.Pages.EngineEditor"
+    xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
     xmlns:local="using:Ghost.App.View.Windows"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:winex="using:WinUIEx"
     Activated="WindowEx_Activated"
+    Closed="WindowEx_Closed"
     mc:Ignorable="d">
 
     <Window.SystemBackdrop>
@@ -192,5 +195,50 @@
                 </StackPanel>
             </Grid>
         </Grid>
+
+        <Grid Grid.Row="0" Grid.RowSpan="4">
+            <InfoBar
+                x:Name="InfoBar"
+                Margin="16"
+                HorizontalAlignment="Right"
+                VerticalAlignment="Bottom">
+                <interactivity:Interaction.Behaviors>
+                    <behaviors:StackedNotificationsBehavior x:Name="NotificationQueue" />
+                </interactivity:Interaction.Behaviors>
+            </InfoBar>
+
+            <Grid
+                x:Name="ProgressBarContainer"
+                Background="{ThemeResource SmokeFillColorDefaultBrush}"
+                Visibility="Collapsed">
+                <Grid
+                    Height="100"
+                    Padding="36,24"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    Background="{ThemeResource SolidBackgroundFillColorBaseBrush}"
+                    CornerRadius="{StaticResource OverlayCornerRadius}">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+
+                    <TextBlock
+                        x:Name="ProgressMessage"
+                        Grid.Row="0"
+                        Margin="0,0,0,12"
+                        HorizontalAlignment="Center"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource TitleTextBlockStyle}"
+                        Text="Loading..." />
+                    <ProgressBar
+                        x:Name="ProgressBar"
+                        Grid.Row="1"
+                        HorizontalAlignment="Stretch"
+                        VerticalAlignment="Center"
+                        IsIndeterminate="True" />
+                </Grid>
+            </Grid>
+        </Grid>
     </Grid>
-</winex:WindowEx>
+</winex:WindowEx>

Ghost.App/View/Windows/EngineEditorWindow.xaml.cs

@@ -1,6 +1,9 @@
-using Ghost.Data.Resources;
+using Ghost.App.Services;
+using Ghost.Data.Resources;
+using Ghost.Editor.Services.Contracts;
 using Ghost.Editor.ViewModels.Windows;
 using Ghost.Engine.Resources;
+using Microsoft.Extensions.DependencyInjection;
 using WinUIEx;
 
 // To learn more about WinUI, the WinUI project structure,
@@ -12,6 +15,11 @@ namespace Ghost.App.View.Windows;
 /// </summary>
 internal sealed partial class EngineEditorWindow : WindowEx
 {
+    private IServiceScope? _editorScope;
+
+    private readonly NotificationService _notificationService;
+    private readonly ProgressService _progressService;
+
     public EngineEditorViewModel ViewModel
     {
         get;
@@ -21,6 +29,9 @@ internal sealed partial class EngineEditorWindow : WindowEx
     {
         ViewModel = GhostApplication.GetService<EngineEditorViewModel>();
 
+        _notificationService = (NotificationService)GhostApplication.GetService<INotificationService>();
+        _progressService = (ProgressService)GhostApplication.GetService<IProgressService>();
+
         AppWindow.SetIcon(AssetsPath.s_appIconPath);
         Title = EngineData.ENGINE_NAME;
         ExtendsContentIntoTitleBar = true;
@@ -33,5 +44,19 @@ internal sealed partial class EngineEditorWindow : WindowEx
     private void WindowEx_Activated(object sender, Microsoft.UI.Xaml.WindowActivatedEventArgs args)
     {
         Bindings.Update();
+
+        _editorScope?.Dispose();
+        _editorScope = GhostApplication.CreateScope();
+
+        _notificationService.SetReference(InfoBar, NotificationQueue);
+        _progressService.SetReference(ProgressBarContainer);
+    }
+
+    private void WindowEx_Closed(object sender, Microsoft.UI.Xaml.WindowEventArgs args)
+    {
+        _editorScope?.Dispose();
+
+        _notificationService.ClearReference();
+        _progressService.ClearReference();
     }
 }

Ghost.App/View/Windows/LandingWindow.xaml

@@ -71,7 +71,6 @@
                     <behaviors:StackedNotificationsBehavior x:Name="NotificationQueue" />
                 </interactivity:Interaction.Behaviors>
             </InfoBar>
-
         </Grid>
     </Grid>
 </winex:WindowEx>

Ghost.App/View/Windows/LandingWindow.xaml.cs

@@ -1,6 +1,7 @@
 using Ghost.App.Services;
 using Ghost.App.View.Pages.Landing;
 using Ghost.Data.Resources;
+using Ghost.Editor.Services.Contracts;
 using Ghost.Engine.Resources;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.UI.Xaml.Controls;
@@ -13,10 +14,14 @@ internal sealed partial class LandingWindow : WindowEx
 {
     private IServiceScope? _landingScope;
 
+    private readonly NotificationService _notificationService;
+
     private int _previousSelectedIndex;
 
     public LandingWindow()
     {
+        _notificationService = (NotificationService)GhostApplication.GetService<INotificationService>();
+
         AppWindow.SetIcon(AssetsPath.s_appIconPath);
         Title = EngineData.ENGINE_NAME;
 
@@ -32,13 +37,13 @@ internal sealed partial class LandingWindow : WindowEx
     {
         _landingScope?.Dispose();
         _landingScope = GhostApplication.CreateScope();
-        GhostApplication.GetService<StackedNotificationService>().SetReference(InfoBar, NotificationQueue);
+        _notificationService.SetReference(InfoBar, NotificationQueue);
     }
 
     private void WindowEx_Closed(object sender, Microsoft.UI.Xaml.WindowEventArgs args)
     {
         _landingScope?.Dispose();
-        GhostApplication.GetService<StackedNotificationService>().ClearReference();
+        _notificationService.ClearReference();
     }
 
     private void SelectorBar_SelectionChanged(SelectorBar sender, SelectorBarSelectionChangedEventArgs e)

Ghost.App/ViewModels/Pages/EngineEditor/HierarchyViewModel.cs

@@ -0,0 +1,38 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using Ghost.Editor.SceneGraph;
+using System;
+using System.Collections.ObjectModel;
+
+namespace Ghost.Editor.ViewModels.Pages.EngineEditor;
+
+internal partial class HierarchyViewModel : ObservableObject, IDisposable
+{
+    [ObservableProperty]
+    public partial ObservableCollection<WorldNode> SceneList
+    {
+        get;
+        private set;
+    } = new(EditorWorldManager.LoadedWorlds);
+
+    public HierarchyViewModel()
+    {
+        EditorWorldManager.OnWorldLoaded += OnWorldLoaded;
+        EditorWorldManager.OnWorldUnloaded += OnWorldUnloaded;
+    }
+
+    private void OnWorldLoaded(WorldNode node)
+    {
+        SceneList.Add(node);
+    }
+
+    private void OnWorldUnloaded(WorldNode node)
+    {
+        SceneList.Remove(node);
+    }
+
+    public void Dispose()
+    {
+        EditorWorldManager.OnWorldLoaded -= OnWorldLoaded;
+        EditorWorldManager.OnWorldUnloaded -= OnWorldUnloaded;
+    }
+}

Ghost.App/ViewModels/Pages/EngineEditor/ProjectViewModel.cs

@@ -2,6 +2,7 @@
 using Ghost.App;
 using Ghost.App.Models;
 using Ghost.Data.Services;
+using Ghost.Editor.AssetHandle;
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -51,9 +52,9 @@ internal partial class ProjectViewModel : ObservableObject
         SubDirectories.Add(assetsRootItem);
     }
 
-    private void LoadSubFolderRecursive(ref ExplorerItem parentItem)
+    private static void LoadSubFolderRecursive(ref ExplorerItem parentItem)
     {
-        foreach (var directory in Directory.EnumerateDirectories(parentItem.Path))
+        foreach (var directory in Directory.EnumerateDirectories(parentItem.FullName))
         {
             var item = new ExplorerItem(Path.GetFileName(directory), directory, true);
             LoadSubFolderRecursive(ref item);
@@ -116,28 +117,35 @@ internal partial class ProjectViewModel : ObservableObject
                 DirectoryAssets.Add(fileItem);
             }
 
-            SelectedDirectory = await FindNodeIterative(SubDirectories[0], x => x.Path == path);
+            SelectedDirectory = await FindNodeIterative(SubDirectories[0], x => x.FullName == path);
         });
     }
 
-    public void NavigateToSelected()
+    public async Task OpenSelected()
     {
-        if (SelectedAsset == null || !SelectedAsset.IsDirectory)
+        if (SelectedAsset == null)
         {
             return;
         }
 
-        NavigateToDirectory(SelectedAsset.Path);
+        if (SelectedAsset.IsDirectory)
+        {
+            NavigateToDirectory(SelectedAsset.FullName);
+        }
+        else
+        {
+            await AssetDatabase.OpenAsset(SelectedAsset.FullName);
+        }
     }
 
     partial void OnSelectedDirectoryChanged(ExplorerItem? value)
     {
-        DirectoryAssets.Clear();
         if (value == null)
         {
             return;
         }
 
-        NavigateToDirectory(value.Path);
+        DirectoryAssets.Clear();
+        NavigateToDirectory(value.FullName);
     }
 }

Ghost.App/ViewModels/Pages/Landing/CreateProjectViewModel.cs

@@ -6,8 +6,8 @@ using Ghost.App.Services;
 using Ghost.App.Utilities;
 using Ghost.Data.Models;
 using Ghost.Data.Services;
+using Ghost.Editor.Models;
 using Ghost.Engine.Resources;
-using Microsoft.UI.Xaml.Controls;
 using System.Collections.ObjectModel;
 using System.IO;
 using System.Linq;
@@ -15,7 +15,7 @@ using System.Threading.Tasks;
 
 namespace Ghost.Editor.ViewModels.Pages.Landing;
 
-internal partial class CreateProjectViewModel(StackedNotificationService notificationService, ProjectService projectService, AppStateMachine stateService) : ObservableObject, INavigationAware
+internal partial class CreateProjectViewModel(NotificationService notificationService, ProjectService projectService, AppStateMachine stateService) : ObservableObject, INavigationAware
 {
     public ObservableCollection<TemplateData> templates = new();
 
@@ -72,14 +72,14 @@ internal partial class CreateProjectViewModel(StackedNotificationService notific
             || !Directory.Exists(ProjectLocation)
             || !SelectedTemplate.HasValue)
         {
-            notificationService.ShowNotification("Incorrect project info", InfoBarSeverity.Error);
+            notificationService.ShowNotification("Incorrect project info", MessageType.Error);
             return;
         }
 
         var result = await projectService.CreateProjectAsync(ProjectName, ProjectLocation, EngineData.s_engineVersion, SelectedTemplate.Value.directory);
         if (!result.success)
         {
-            notificationService.ShowNotification(result.message, InfoBarSeverity.Error);
+            notificationService.ShowNotification(result.message, MessageType.Error);
             return;
         }
 
@@ -89,7 +89,7 @@ internal partial class CreateProjectViewModel(StackedNotificationService notific
         }
         catch (System.Exception e)
         {
-            notificationService.ShowNotification($"Failed to load project: {e.Message}", InfoBarSeverity.Error);
+            notificationService.ShowNotification($"Failed to load project: {e.Message}", MessageType.Error);
         }
     }
 }

Ghost.App/ViewModels/Pages/Landing/OpenProjectViewModel.cs

@@ -1,11 +1,11 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using Ghost.App.Contracts;
 using Ghost.App.Infrastructures.AppState;
-using Ghost.App.Services;
 using Ghost.Data.Models;
 using Ghost.Data.Services;
+using Ghost.Editor.Models;
+using Ghost.Editor.Services.Contracts;
 using Microsoft.UI.Xaml;
-using Microsoft.UI.Xaml.Controls;
 using System;
 using System.Collections.ObjectModel;
 using System.Linq;
@@ -15,7 +15,7 @@ using Windows.Storage;
 
 namespace Ghost.Editor.ViewModels.Pages.Landing;
 
-internal partial class OpenProjectViewModel(ProjectService projectService, StackedNotificationService _notificationService, AppStateMachine _stateService) : ObservableObject, INavigationAware
+internal partial class OpenProjectViewModel(ProjectService projectService, INotificationService _notificationService, AppStateMachine _stateService) : ObservableObject, INavigationAware
 {
     public readonly ObservableCollection<ProjectMetadataInfo> projects = new();
 
@@ -86,7 +86,7 @@ internal partial class OpenProjectViewModel(ProjectService projectService, Stack
             errorMessage = "Unsupported data format. Please drop a folder containing a project.";
         }
 
-        _notificationService.ShowNotification(errorMessage, InfoBarSeverity.Error);
+        _notificationService.ShowNotification(errorMessage, MessageType.Error);
 
     CloseDropPanel:
         DragVisibility = Visibility.Collapsed;
@@ -104,7 +104,7 @@ internal partial class OpenProjectViewModel(ProjectService projectService, Stack
         }
         catch (Exception e)
         {
-            _notificationService.ShowNotification($"Failed to load project: {e.Message}", InfoBarSeverity.Error);
+            _notificationService.ShowNotification($"Failed to load project: {e.Message}", MessageType.Error);
         }
     }
 }

Ghost.ArchetypeEntities/AssemblyInfo.cs

@@ -1,7 +0,0 @@
-global using EntityID = System.UInt32;
-global using GenerationID = System.UInt16;
-global using WorldID = System.UInt16;
-
-using System.Runtime.CompilerServices;
-
-[assembly: InternalsVisibleTo("Ghost.Engine")]

Ghost.ArchetypeEntities/Chunk.cs

@@ -1,213 +0,0 @@
-using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Helpers;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-
-namespace Ghost.Entities;
-
-internal unsafe struct ChunkCollection : IDisposable
-{
-    private UnsafeArray<Chunk> _chunkStorage;
-    private int _count;
-    private int _capacity;
-
-    public readonly int Count => _count;
-    public readonly int Capacity => _capacity;
-
-    public readonly ref Chunk this[int index] => ref _chunkStorage[index];
-
-    public ChunkCollection(int capacity)
-    {
-        _chunkStorage = new(capacity, Allocator.Persistent);
-        _count = 0;
-        _capacity = capacity;
-    }
-
-    public void Add(Chunk chunk)
-    {
-        _chunkStorage[_count] = chunk;
-        _count++;
-    }
-
-    public void EnsureCapacity(int newCapacity)
-    {
-        if (newCapacity <= _capacity)
-        {
-            return;
-        }
-
-        _chunkStorage.Resize(newCapacity);
-    }
-
-    public void TrimExcess()
-    {
-        if (_count == _capacity)
-        {
-            return;
-        }
-
-        _chunkStorage.Resize(_count);
-    }
-
-    public void Clear()
-    {
-        for (var i = 0; i < _count; i++)
-        {
-            _chunkStorage[i].Clear();
-        }
-
-        _count = 0;
-        _capacity = 0;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly Span<Chunk> AsSpan()
-    {
-        return _chunkStorage.AsSpan();
-    }
-
-    public void Dispose()
-    {
-        for (var i = 0; i < _count; i++)
-        {
-            _chunkStorage[i].Dispose();
-        }
-
-        _chunkStorage.Dispose();
-        _count = 0;
-        _capacity = 0;
-    }
-}
-
-internal struct Chunk : IDisposable
-{
-    public UnsafeArray<Entity> entities;
-    public UnsafeArray<UnsafeArray<byte>> components;
-
-    // The component lookup array is used to quickly find the index of a component in the components array.
-    // Mapping component ID to component index in the components array.
-    private UnsafeArray<int> _componentLookup;
-
-    private int _count;
-    private readonly int _capacity;
-    private bool _isDisposed;
-
-    public readonly int Count => _count;
-    public readonly int Capacity => _capacity;
-
-    public Chunk(int capacity, Span<ComponentData> data) : this(capacity, data, Component.ToLookupArray(data, Allocator.Persistent))
-    {
-    }
-
-    public Chunk(int capacity, Span<ComponentData> data, UnsafeArray<int> lookup)
-    {
-        _count = 0;
-        _capacity = capacity;
-
-        entities = new((int)capacity, Allocator.Persistent);
-        components = new(data.Length, Allocator.Persistent);
-
-        _componentLookup = lookup;
-
-        for (var i = 0; i < data.Length; i++)
-        {
-            var component = data[i];
-            components[component.id] = new UnsafeArray<byte>(capacity * (int)component.sizeInByte, Allocator.Persistent);
-        }
-    }
-
-    public int Add(Entity entity)
-    {
-        var index = _count;
-        entities[index] = entity;
-        _count++;
-
-        return index;
-    }
-
-    public unsafe bool Remove(int index)
-    {
-        if (index < 0 || index >= _count)
-        {
-            return false;
-        }
-
-        var lastIndex = _count--;
-        entities[index] = entities[lastIndex];
-
-        for (var i = 0; i < components.Count; i++)
-        {
-            var componentArray = UnsafeUtilities.ReadArrayElementUnsafe<UnsafeArray<byte>>(components.GetUnsafePtr(), i);
-            var componentSize = componentArray->Count / _capacity;
-            var removedComponent = UnsafeUtilities.ReadArrayElementUnsafe<byte>(componentArray->GetUnsafePtr(), index * componentSize);
-            var lastComponent = UnsafeUtilities.ReadArrayElementUnsafe<byte>(componentArray->GetUnsafePtr(), lastIndex * componentSize);
-            MemoryUtilities.MemCpy(removedComponent, lastComponent, (nuint)componentSize);
-        }
-
-        return true;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private readonly int IndexOf<T>()
-        where T : unmanaged, IComponent
-    {
-        var id = Component<T>.data.id;
-        Debug.Assert(id != -1 && id < _componentLookup.Count, $"Index is out of bounds, component {typeof(T)} with id {id} does not exist in this chunk.");
-        return _componentLookup[id];
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool Has<T>()
-        where T : unmanaged, IComponent
-    {
-        var id = Component<T>.data.id;
-        return id < _componentLookup.Count && _componentLookup[id] != -1;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly unsafe UnsafeArray<T> GetArrayOf<T>()
-        where T : unmanaged, IComponent
-    {
-        var index = IndexOf<T>();
-        var componentArray = components[index];
-        return UnsafeUtilities.CastArray<byte, T>(componentArray);
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly unsafe ref T GetComponent<T>(int index)
-        where T : unmanaged, IComponent
-    {
-        var componentArray = GetArrayOf<T>();
-        return ref componentArray[index];
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly Entity GetEntity(int index)
-    {
-        return entities[index];
-    }
-
-    public void Clear()
-    {
-        _count = 0;
-    }
-
-    public void Dispose()
-    {
-        if (_isDisposed)
-        {
-            return;
-        }
-
-        entities.Dispose();
-        _componentLookup.Dispose();
-
-        for (var i = 0; i < components.Count; i++)
-        {
-            components[i].Dispose();
-        }
-        components.Dispose();
-
-        _isDisposed = true;
-    }
-}

Ghost.ArchetypeEntities/Component.cs

@@ -1,116 +0,0 @@
-using Ghost.Entities.Helpers;
-using Ghost.Entities.Registries;
-using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Helpers;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-namespace Ghost.Entities;
-
-public interface IComponent
-{
-
-}
-
-[SkipLocalsInit]
-internal readonly record struct ComponentData
-{
-    public readonly int id;
-    public readonly int sizeInByte;
-
-    public ComponentData(int id, int sizeInByte)
-    {
-        this.id = id;
-        this.sizeInByte = sizeInByte;
-    }
-}
-
-internal static class Component
-{
-    internal static int GetTotalSize(in Span<ComponentData> datas)
-    {
-        var size = 0;
-        foreach (var type in datas)
-        {
-            var typeSize = type.sizeInByte;
-            typeSize = typeSize != 1 ? typeSize : 0; // Ignore tag components
-            size += typeSize;
-        }
-
-        return size;
-    }
-
-    internal static unsafe UnsafeArray<int> ToLookupArray(in Span<ComponentData> datas, Allocator allocator)
-    {
-        var max = 0;
-        foreach (var data in datas)
-        {
-            var componentId = data.id;
-            if (componentId >= max)
-            {
-                max = componentId;
-            }
-        }
-
-        // Create lookup table where the component ID points to the component index.
-        var array = new UnsafeArray<int>(max + 1, allocator);
-        array.AsSpan().Fill(-1);
-
-        for (var index = 0; index < datas.Length; index++)
-        {
-            ref var type = ref datas[index];
-            var componentId = type.id;
-            array[componentId] = index;
-        }
-
-        return array;
-    }
-
-    internal static int GetHashCode(Span<ComponentData> components)
-    {
-        // Search for the highest id to determine how much uints we need for the stack.
-        var highestId = 0;
-        foreach (ref var cmp in components)
-        {
-            if (cmp.id > highestId)
-            {
-                highestId = cmp.id;
-            }
-        }
-
-        // Allocate the stack and set bits to replicate a bitset
-        var length = BitSet.RequiredLength(highestId + 1);
-        Span<uint> stack = stackalloc uint[length];
-        var spanBitSet = new SpanBitSet(stack);
-
-        foreach (ref var type in components)
-        {
-            var x = type.id;
-            spanBitSet.SetBit(x);
-        }
-
-        return GetHashCode(stack);
-    }
-
-    public static int GetHashCode(Span<uint> span)
-    {
-        var hashCode = new HashCode();
-        hashCode.AddBytes(MemoryMarshal.AsBytes(span));
-
-        return hashCode.ToHashCode();
-    }
-}
-
-internal static class Component<T>
-    where T : unmanaged, IComponent
-{
-    public static readonly ComponentData data;
-
-    public static readonly Signature signature;
-
-    static Component()
-    {
-        data = ComponentRegistry.GetOrAdd<T>();
-        signature = new Signature(data);
-    }
-}

Ghost.ArchetypeEntities/Core/Archetype.Edge.cs

@@ -1,19 +0,0 @@
-using Misaki.HighPerformance.Unsafe.Collections;
-
-namespace Ghost.Entities.Core;
-internal partial struct Archetype : IEquatable<Archetype>
-{
-    public void AddInsertionEdge(Archetype archetype)
-    {
-        if (_insertionEdges.IsCreated)
-        {
-            _insertionEdges = new UnsafeHashSet<Archetype>(_BUCKET_SIZE, Allocator.Persistent);
-        }
-        _insertionEdges.Add(archetype);
-    }
-
-    public readonly bool Equals(Archetype other)
-    {
-        return signature.Equals(other.signature);
-    }
-}

Ghost.ArchetypeEntities/Core/Archetype.cs

@@ -1,76 +0,0 @@
-using Ghost.Entities.Helpers;
-using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Helpers;
-
-namespace Ghost.Entities.Core;
-
-internal partial struct Archetype : IDisposable
-{
-    private const int _BUCKET_SIZE = 16;
-
-    // The component ID to array index lookup array.
-    private UnsafeArray<int> _lookupArray;
-
-    public readonly int sizeOfBaseChunk;
-    public readonly int sizeOfChunk;
-
-    public readonly int entitiesPerChunk;
-    public int totalEntityCount;
-
-    public Signature signature;
-    // For fast lookups
-    public BitSet bitSet;
-    public ChunkCollection chunks;
-
-
-    private UnsafeHashSet<Archetype> _insertionEdges;
-    private UnsafeHashSet<Archetype> _deletionEdges;
-
-    public readonly UnsafeArray<int> LookupArray => _lookupArray;
-
-    internal Archetype(Signature signature, int sizeOfBaseChunk, int minimalEntityCountPerChunk)
-    {
-        this.signature = signature;
-        this.sizeOfBaseChunk = sizeOfBaseChunk;
-
-        var sizeOfTotalData = Component.GetTotalSize(signature.componentDatas.AsSpan());
-        sizeOfChunk = GetSizeOfChunk(sizeOfBaseChunk, minimalEntityCountPerChunk, sizeOfTotalData);
-        entitiesPerChunk = GetEntityCount(sizeOfChunk, sizeOfTotalData);
-
-        _lookupArray = Component.ToLookupArray(signature.componentDatas.AsSpan(), Allocator.Persistent);
-        bitSet = new BitSet();
-        for (var i = 0; i < signature.componentDatas.Count; i++)
-        {
-            bitSet.SetBit(signature.componentDatas[i].id);
-        }
-
-        chunks = new ChunkCollection(1);
-        AddNewChunk();
-    }
-
-    private unsafe static int GetEntityCount(int sizeOfChunk, int sizeOfTotalData)
-    {
-        return sizeOfChunk / (sizeof(Entity) + sizeOfTotalData);
-    }
-
-    private static unsafe int GetSizeOfChunk(int sizeOfBaseChunk, int entityCount, int sizeOfTotalData)
-    {
-        var entityBytes = (sizeof(Entity) + sizeOfTotalData) * entityCount;
-        return (int)Math.Ceiling((float)entityBytes / sizeOfBaseChunk) * sizeOfBaseChunk;  // Calculates and rounds to a multiple of BaseSize to store the number of entities
-    }
-
-    public ref Chunk AddNewChunk()
-    {
-        chunks.EnsureCapacity(chunks.Count + 1);
-        chunks.Add(new Chunk(entitiesPerChunk, signature.componentDatas.AsSpan(), _lookupArray));
-        return ref chunks[^1];
-    }
-
-    public void Dispose()
-    {
-        _lookupArray.Dispose();
-        signature.Dispose();
-        bitSet.Dispose();
-        chunks.Dispose();
-    }
-}

Ghost.ArchetypeEntities/Core/Slot.cs

@@ -1,105 +0,0 @@
-using System.Runtime.CompilerServices;
-
-namespace Ghost.Entities.Core;
-
-/// <summary>
-/// The <see cref="Slot"/> struct references an <see cref="Entity"/> entry within an <see cref="Archetype"/> using a reference to its <see cref="Chunk"/> and its index.
-/// </summary>
-[SkipLocalsInit]
-internal record struct Slot
-{
-    /// <summary>
-    /// The index of the <see cref="Entity"/> in the <see cref="Chunk"/>.
-    /// </summary>
-    public int index;
-
-    /// <summary>
-    /// The index of the <see cref="Chunk"/> in which the <see cref="Entity"/> is located.
-    /// </summary>
-    public int chunkIndex;
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="Slot"/> struct.
-    /// </summary>
-    /// <param name="index">The index of the <see cref="Entity"/> in the <see cref="Chunk"/>.</param>
-    /// <param name="chunkIndex">The index of the <see cref="Chunk"/> in which the <see cref="Entity"/> is located.</param>
-    public Slot(int index, int chunkIndex)
-    {
-        this.index = index;
-        this.chunkIndex = chunkIndex;
-    }
-
-    /// <summary>
-    /// Adds a plus operator for easy calculation of new <see cref="Slot"/>. Adds the positions of both <see cref="Slot"/>s.
-    /// </summary>
-    /// <param name="first">The first <see cref="Slot"/>.</param>
-    /// <param name="second">The second <see cref="Slot"/>.</param>
-    /// <returns>The result <see cref="Slot"/>.</returns>
-    public static Slot operator +(Slot first, Slot second)
-    {
-        return new Slot(first.index + second.index, first.chunkIndex + second.chunkIndex);
-    }
-
-    /// <summary>
-    /// Adds a plus plus operator for easy calculation of new <see cref="Slot"/>. Increases the index by one.
-    /// </summary>
-    /// <param name="slot">The <see cref="Slot"/>.</param>
-    /// <returns>The <see cref="Slot"/> with index increased by one..</returns>
-    public static Slot operator ++(Slot slot)
-    {
-        slot.index++;
-        return slot;
-    }
-
-    /// <summary>
-    /// Validates the <see cref="Slot"/>, moves the <see cref="Slot"/> if it is outside a <see cref="Chunk.Capacity"/> to match it.
-    /// </summary>
-    /// <returns></returns>
-    public void Wrap(int capacity)
-    {
-        // Result outside valid chunk, wrap into next one
-        if (index < capacity)
-        {
-            return;
-        }
-
-        // Index outside of its chunk, so we calculate how many times a chunk fit into the index for adjusting the chunkindex to that position.
-        // Floor since we do not need a rounded value since the index is within that chunk and not the next one.
-        chunkIndex += (int)Math.Floor(index / (float)capacity);
-
-        // After moving the chunk index we can simply take the rest and assign it as a index.
-        index %= capacity;
-    }
-
-    /// <summary>
-    /// Moves or shifts this <see cref="Slot"/> by one slot forward.
-    /// Ensures that the slots chunkindex updated properly once the end was reached.
-    /// </summary>
-    /// <param name="source">The <see cref="Slot"/> to shift by one.</param>
-    /// <param name="sourceCapacity">The capacity of the chunk the slot is in.</param>
-    /// <returns></returns>
-    public static Slot Shift(ref Slot source, int sourceCapacity)
-    {
-        source.index++;
-        source.Wrap(sourceCapacity);
-        return source;
-    }
-
-    /// <summary>
-    /// Moves or shifts the source <see cref="Slot"/> based on the destination <see cref="Slot"/> and calculates its new position.
-    /// Used for copy operations to predict where the source <see cref="Slot"/> will end up.
-    /// </summary>
-    /// <param name="source">The source <see cref="Slot"/>, from which we want to calculate where it lands..</param>
-    /// <param name="destination">The destination <see cref="Slot"/>, a reference point at which the copy or shift operation starts.</param>
-    /// <param name="sourceCapacity">The source <see cref="Chunk.Capacity"/>.</param>
-    /// <param name="destinationCapacity">The destination <see cref="Chunk.Capacity"/></param>
-    public static Slot Shift(in Slot source, int sourceCapacity, in Slot destination, int destinationCapacity)
-    {
-        var freeSpot = destination;
-        var resultSlot = source + freeSpot;
-        resultSlot.index += source.chunkIndex * (sourceCapacity - destinationCapacity);
-        resultSlot.Wrap(destinationCapacity);
-
-        return resultSlot;
-    }
-}

Ghost.ArchetypeEntities/Entity.cs

@@ -1,93 +0,0 @@
-using System.Runtime.CompilerServices;
-
-namespace Ghost.Entities;
-
-[SkipLocalsInit]
-public struct Entity : IEquatable<Entity>, IComparable<Entity>
-{
-    private const EntityID _WORLD_INDEX_BITS = 4u;
-    private const EntityID _GENERATION_BITS = 8u;
-    private const EntityID _INDEX_BITS = sizeof(EntityID) * 8 - _WORLD_INDEX_BITS - _GENERATION_BITS;
-
-    private const EntityID _WORLD_INDEX_MASK = (1u << (int)_WORLD_INDEX_BITS) - 1;
-    private const EntityID _GENERATION_MASK = (1u << (int)_GENERATION_BITS) - 1;
-    private const EntityID _INDEX_MASK = (1u << (int)_INDEX_BITS) - 1;
-    private const EntityID _ID_MASK = EntityID.MaxValue;
-
-    private EntityID _id;
-
-    public readonly bool IsValid
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => _id != _ID_MASK;
-    }
-
-    public readonly EntityID Index
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => _id & _INDEX_MASK;
-    }
-
-    public readonly GenerationID Generation
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => (GenerationID)(_id >> (int)_INDEX_BITS & _GENERATION_MASK);
-    }
-
-    public readonly WorldID WorldIndex
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => (WorldID)(_id >> (int)(_INDEX_BITS + _GENERATION_BITS) & _WORLD_INDEX_MASK);
-    }
-
-    public void IncrementGeneration()
-    {
-        var generation = Generation + 1u;
-        if (generation >= _GENERATION_MASK)
-        {
-            throw new InvalidOperationException("Generation overflow");
-        }
-
-        _id = _id & ~(_GENERATION_MASK << (int)_INDEX_BITS) | generation << (int)_INDEX_BITS;
-    }
-
-    internal Entity(EntityID index, EntityID generation, EntityID worldIndex)
-    {
-        _id = worldIndex << (int)(_INDEX_BITS + _GENERATION_BITS) | generation << (int)_INDEX_BITS | index;
-    }
-
-    public readonly bool Equals(Entity other)
-    {
-        return _id == other._id;
-    }
-
-    public readonly int CompareTo(Entity other)
-    {
-        return _id.CompareTo(other._id);
-    }
-
-    public override readonly bool Equals(object? obj)
-    {
-        return obj is Entity other && Equals(other);
-    }
-
-    public override readonly int GetHashCode()
-    {
-        return _id.GetHashCode();
-    }
-
-    public static bool operator ==(Entity left, Entity right)
-    {
-        return left.Equals(right);
-    }
-
-    public static bool operator !=(Entity left, Entity right)
-    {
-        return !(left == right);
-    }
-
-    public override readonly string ToString()
-    {
-        return $"Entity {{ Index: {Index}, Generation: {Generation}, WorldIndex: {WorldIndex} }}";
-    }
-}

Ghost.ArchetypeEntities/Ghost.Entities.csproj

@@ -1,24 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-    <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <IsAotCompatible>True</IsAotCompatible>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
-    <IsAotCompatible>True</IsAotCompatible>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <Reference Include="Misaki.HighPerformance.Unsafe">
-      <HintPath>..\..\Class\Misaki.HighPerformance\Misaki.HighPerformance.Unsafe\bin\Release\net9.0\Misaki.HighPerformance.Unsafe.dll</HintPath>
-    </Reference>
-  </ItemGroup>
-
-</Project>

Ghost.ArchetypeEntities/Helpers/BitSet.cs

@@ -1,604 +0,0 @@
-// Code from https://github.com/genaray/Arch/blob/master/src/Arch/Core/Utils/BitSet.cs
-
-using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Helpers;
-using System.Numerics;
-using System.Runtime.CompilerServices;
-using System.Text;
-
-namespace Ghost.Entities.Helpers;
-
-// NOTE: Can this be replaced with `System.Collections.BitArray`?
-// NOTE: If not, can it at least mirror that type's API?
-/// <summary>
-/// The <see cref="BitSet"/> class
-/// represents a resizable collection of bits.
-/// </summary>
-public struct BitSet : IDisposable
-{
-    private const int _BIT_SIZE = (sizeof(uint) * 8) - 1; // 31
-    private const int _INDEX_SIZE = 5;  // log_2(BitSize + 1)
-
-    private static readonly int _padding = Vector<uint>.Count; // The padding used for vectorisation, the amount of uints required for being vectorized basically
-
-    /// <summary>
-    /// Determines the required length of an <see cref="BitSet"/> to hold the passed id or bit.
-    /// </summary>
-    /// <param name="id">The id or bit.</param>
-    /// <returns>A size of required <see cref="uint"/>s for the bitset.</returns>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public static int RequiredLength(int id)
-    {
-        return (id >> 5) + int.Sign(id & _BIT_SIZE);
-    }
-
-    /// <summary>
-    /// The bits from the bitset.
-    /// </summary>
-    private UnsafeArray<uint> _bits;
-
-    /// TODO: Update on ClearBit, however clearbit is only used in tests so its fine for now.
-    /// <summary>
-    /// The highest bit set.
-    /// </summary>
-    private int _highestBit;
-
-    /// TODO: Update on ClearBit, probably remove <see cref="_highestBit"/> in favor?
-    /// <summary>
-    /// The maximum <see cref="_bits"/>-index current in use.
-    /// </summary>
-    private int _max;
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="BitSet" /> class.
-    /// </summary>
-    public BitSet()
-    {
-        _bits = new UnsafeArray<uint>(_padding, Allocator.Persistent);
-    }
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="BitSet" /> class.
-    /// </summary>
-    public BitSet(params Span<uint> bits)
-    {
-        _bits = new UnsafeArray<uint>(bits.Length, Allocator.Persistent);
-        _bits.CopyFrom(bits);
-    }
-
-    /// <summary>
-    /// The highest uint index in use inside the <see cref="_bits"/>-array.
-    /// </summary>
-    public readonly int HighestIndex
-    {
-        get => _max;
-    }
-
-    /// <summary>
-    /// The highest bit set.
-    /// </summary>
-    public readonly int HighestBit
-    {
-        get => _highestBit;
-    }
-
-    /// <summary>
-    /// Returns the length of the bitset, how many int's it consists of.
-    /// </summary>
-    public readonly int Count
-    {
-        get => _bits.Count;
-    }
-
-    /// <summary>
-    /// Checks whether a bit is set at the index.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    /// <returns>True if it is, otherwise false</returns>
-    public readonly bool IsSet(int index)
-    {
-        var b = index >> _INDEX_SIZE;
-        if (b >= _bits.Count)
-        {
-            return false;
-        }
-
-        return (_bits[b] & (1 << (index & _BIT_SIZE))) != 0;
-    }
-
-    /// <summary>
-    /// Sets a bit at the given index.
-    /// Resizes its internal array if necessary.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    public void SetBit(int index)
-    {
-        var b = index >> _INDEX_SIZE;
-        if (b >= _bits.Count)
-        {
-            _bits.Resize((b + _padding) / _padding * _padding);  // Round up to a multiply of Padding
-        }
-
-        // Track highest set bit
-        _highestBit = Math.Max(_highestBit, index);
-        _max = (_highestBit / (_BIT_SIZE + 1)) + 1;
-        _bits[b] |= 1u << (index & _BIT_SIZE);
-    }
-
-    /// <summary>
-    /// Clears the bit at the given index.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    public readonly void ClearBit(int index)
-    {
-        var b = index >> _INDEX_SIZE;
-        if (b >= _bits.Count)
-        {
-            return;
-        }
-
-        _bits[b] &= ~(1u << (index & _BIT_SIZE));
-    }
-
-    /// <summary>
-    /// Sets all bits.
-    /// </summary>
-    public void SetAll()
-    {
-        var count = _bits.Count;
-        for (var i = 0; i < count; i++)
-        {
-            _bits[i] = 0xffffffff;
-        }
-
-        _highestBit = (_bits.Count * (_BIT_SIZE + 1)) - 1;
-        _max = (_highestBit / (_BIT_SIZE + 1)) + 1;
-    }
-
-    /// <summary>
-    /// Clears all set bits.
-    /// </summary>
-    public readonly void ClearAll()
-    {
-        _bits.Clear();
-    }
-
-    /// <summary>
-    /// Checks if all bits from this instance match those of the other instance.
-    /// </summary>
-    /// <param name="other">The other <see cref="BitSet"/>.</param>
-    /// <returns>True if they match, false if not.</returns>
-    [SkipLocalsInit]
-    public readonly bool All(BitSet other)
-    {
-        var min = Math.Min(Math.Min(Count, other.Count), _max);
-        if (!Vector.IsHardwareAccelerated || min < _padding)
-        {
-            // Bitwise and
-            for (var i = 0; i < min; i++)
-            {
-                var bit = _bits[i];
-                if ((bit & other._bits[i]) != bit)
-                {
-                    return false;
-                }
-            }
-
-            // Handle extra bits on our side that might just be all zero.
-            for (var i = min; i < _max; i++)
-            {
-                if (_bits[i] != 0)
-                {
-                    return false;
-                }
-            }
-        }
-        else
-        {
-            // Vectorized bitwise and
-            for (var i = 0; i < min; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                var otherVector = new Vector<uint>(other._bits.AsSpan()[i..]);
-
-                var resultVector = Vector.BitwiseAnd(vector, otherVector);
-                if (!Vector.EqualsAll(resultVector, vector))
-                {
-                    return false;
-                }
-            }
-
-            // Handle extra bits on our side that might just be all zero.
-            for (var i = min; i < _max; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                if (!Vector.EqualsAll(vector, Vector<uint>.Zero)) // Vectors are not zero bits[0] != 0 basically
-                {
-                    return false;
-                }
-            }
-        }
-
-        return true;
-    }
-
-    /// <summary>
-    /// Checks if any bits from this instance match those of the other instance.
-    /// </summary>
-    /// <param name="other">The other <see cref="BitSet"/>.</param>
-    /// <returns>True if they match, false if not.</returns>
-    public readonly bool Any(BitSet other)
-    {
-        var min = Math.Min(Math.Min(Count, other.Count), _max);
-        if (!Vector.IsHardwareAccelerated || min < _padding)
-        {
-            var bits = _bits.AsSpan();
-            var otherBits = other._bits.AsSpan();
-
-            // Bitwise and, return true since any is met
-            for (var i = 0; i < min; i++)
-            {
-                var bit = bits[i];
-                if ((bit & otherBits[i]) > 0)
-                {
-                    return true;
-                }
-            }
-
-            // Handle extra bits on our side that might just be all zero.
-            for (var i = min; i < _max; i++)
-            {
-                if (bits[i] > 0)
-                {
-                    return false;
-                }
-            }
-        }
-        else
-        {
-            // Vectorized bitwise and, return true since any is met
-            for (var i = 0; i < min; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                var otherVector = new Vector<uint>(other._bits.AsSpan()[i..]);
-
-                var resultVector = Vector.BitwiseAnd(vector, otherVector);
-                if (!Vector.EqualsAll(resultVector, Vector<uint>.Zero))
-                {
-                    return true;
-                }
-            }
-
-            // Handle extra bits on our side that might just be all zero.
-            for (var i = min; i < _max; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                if (!Vector.EqualsAll(vector, Vector<uint>.Zero)) // Vectors are not zero bits[0] != 0 basically
-                {
-                    return false;
-                }
-            }
-        }
-
-        return _highestBit <= 0;
-    }
-
-    /// <summary>
-    /// Checks if none bits from this instance match those of the other instance.
-    /// </summary>
-    /// <param name="other">The other <see cref="BitSet"/>.</param>
-    /// <returns>True if none match, false if not.</returns>
-    public readonly bool None(BitSet other)
-    {
-        var min = Math.Min(Math.Min(Count, other.Count), _max);
-        if (!Vector.IsHardwareAccelerated || min < _padding)
-        {
-            var bits = _bits.AsSpan();
-            var otherBits = other._bits.AsSpan();
-
-            // Bitwise and, return true since any is met
-            for (var i = 0; i < min; i++)
-            {
-                var bit = bits[i];
-                if ((bit & otherBits[i]) != 0)
-                {
-                    return false;
-                }
-            }
-        }
-        else
-        {
-            // Vectorized bitwise and, return true since any is met
-            for (var i = 0; i < min; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                var otherVector = new Vector<uint>(other._bits.AsSpan()[i..]);
-
-                var resultVector = Vector.BitwiseAnd(vector, otherVector);
-                if (!Vector.EqualsAll(resultVector, Vector<uint>.Zero))
-                {
-                    return false;
-                }
-            }
-        }
-
-        return true;
-    }
-
-    /// <summary>
-    /// Checks if exactly all bits from this instance match those of the other instance.
-    /// </summary>
-    /// <param name="other">The other <see cref="BitSet"/>.</param>
-    /// <returns>True if they match, false if not.</returns>
-    public readonly bool Exclusive(BitSet other)
-    {
-        var min = Math.Min(Math.Min(Count, other.Count), _max);
-
-        if (!Vector.IsHardwareAccelerated || min < _padding)
-        {
-            var bits = _bits.AsSpan();
-            var otherBits = other._bits.AsSpan();
-
-            // Bitwise xor, if both are not totally equal, return false
-            for (var i = 0; i < min; i++)
-            {
-                var bit = bits[i];
-                if ((bit ^ otherBits[i]) != 0)
-                {
-                    return false;
-                }
-            }
-
-            // handle extra bits on our side that might just be all zero
-            for (var i = min; i < _max; i++)
-            {
-                if (bits[i] != 0)
-                {
-                    return false;
-                }
-            }
-        }
-        else
-        {
-            // Vectorized bitwise xor, return true since any is met
-            for (var i = 0; i < min; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                var otherVector = new Vector<uint>(other._bits.AsSpan()[i..]);
-
-                var resultVector = Vector.Xor(vector, otherVector);
-                if (!Vector.EqualsAll(resultVector, Vector<uint>.Zero))
-                {
-                    return false;
-                }
-            }
-
-            // Handle extra bits on our side that might just be all zero.
-            for (var i = min; i < _max; i += _padding)
-            {
-                var vector = new Vector<uint>(_bits.AsSpan()[i..]);
-                if (!Vector.EqualsAll(vector, Vector<uint>.Zero)) // Vectors are not zero bits[0] != 0 basically
-                {
-                    return false;
-                }
-            }
-        }
-
-        return true;
-    }
-
-    /// <summary>
-    ///     Creates a <see cref="Span{T}"/> to access the <see cref="_bits"/>.
-    /// </summary>
-    /// <returns>The hash.</returns>
-    public readonly Span<uint> AsSpan()
-    {
-        var max = (_highestBit / (_BIT_SIZE + 1)) + 1;
-        return _bits.AsSpan()[0..max];
-    }
-
-    /// <summary>
-    ///     Copies the bits into a <see cref="Span{T}"/> and returns a slice containing the copied <see cref="_bits"/>.
-    /// </summary>
-    /// <param name="span">The <see cref="Span{T}"/> to copy into.</param>
-    /// <param name="zero">If true, it will zero the unused space from the <see cref="span"/>.</param>
-    /// <returns>The <see cref="Span{T}"/>.</returns>
-    public readonly Span<uint> AsSpan(Span<uint> span, bool zero = true)
-    {
-        // Copy everything that's possible from one to another
-        var length = Math.Min(Count, span.Length);
-        for (var index = 0; index < length; index++)
-        {
-            span[index] = _bits[index];
-        }
-
-        // Zero the rest space which was not overriden due to the copy.
-        for (var index = length; zero && index < span.Length; index++)
-        {
-            span[index] = 0;
-        }
-
-        return span[0..length];
-    }
-
-    /// <summary>
-    ///     Calculates the hash, this is unique for the set bits. Two <see cref="BitSet"/> with the same set bits, result in the same hash.
-    /// </summary>
-    /// <returns>The hash.</returns>
-    public readonly override int GetHashCode()
-    {
-        return Component.GetHashCode(AsSpan());
-    }
-
-    /// <summary>
-    ///     Prints the content of this instance.
-    /// </summary>
-    /// <returns>The string.</returns>
-    public readonly override string ToString()
-    {
-        // Convert uint to binary form for pretty printing
-        var binaryBuilder = new StringBuilder();
-        foreach (var bit in _bits)
-        {
-            binaryBuilder.Append(Convert.ToString((uint)bit, 2).PadLeft(32, '0')).Append(',');
-        }
-        binaryBuilder.Length--;
-
-        return $"{nameof(_bits)}: {binaryBuilder}, {nameof(Count)}: {Count}";
-    }
-
-    public void Dispose()
-    {
-        _bits.Dispose();
-    }
-}
-
-/// <summary>
-/// The <see cref="SpanBitSet"/> struct
-/// represents a non resizable collection of bits.
-/// Used to set, check and clear bits on a allocated <see cref="BitSet"/> or on the stack.
-/// </summary>
-public readonly ref struct SpanBitSet
-{
-    private const int _BIT_SIZE = (sizeof(uint) * 8) - 1; // 31
-    // NOTE: Is a byte not 8 bits?
-    private const int _BYTE_SIZE = 5; // log_2(BitSize + 1)
-
-    /// <summary>
-    ///     The bits from the bitset.
-    /// </summary>
-    private readonly Span<uint> _bits;
-
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="BitSet" /> class.
-    /// </summary>
-    public SpanBitSet(Span<uint> bits)
-    {
-        _bits = bits;
-    }
-
-    /// <summary>
-    /// Checks whether a bit is set at the index.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    /// <returns>True if it is, otherwise false</returns>
-    public bool IsSet(int index)
-    {
-        var b = index >> _BYTE_SIZE;
-        if (b >= _bits.Length)
-        {
-            return false;
-        }
-
-        return (_bits[b] & (1 << (index & _BIT_SIZE))) != 0;
-    }
-
-    /// <summary>
-    /// Sets a bit at the given index.
-    /// Resizes its internal array if necessary.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    public void SetBit(int index)
-    {
-        var b = index >> _BYTE_SIZE;
-        if (b >= _bits.Length)
-        {
-            return;
-        }
-
-        _bits[b] |= 1u << (index & _BIT_SIZE);
-    }
-
-    /// <summary>
-    /// Clears the bit at the given index.
-    /// </summary>
-    /// <param name="index">The index.</param>
-    public void ClearBit(int index)
-    {
-        var b = index >> _BYTE_SIZE;
-        if (b >= _bits.Length)
-        {
-            return;
-        }
-
-        _bits[b] &= ~(1u << (index & _BIT_SIZE));
-    }
-
-    /// <summary>
-    /// Sets all bits.
-    /// </summary>
-    public void SetAll()
-    {
-        var count = _bits.Length;
-        for (var i = 0; i < count; i++)
-        {
-            _bits[i] = 0xffffffff;
-        }
-    }
-
-    /// <summary>
-    /// Clears all set bits.
-    /// </summary>
-    public void ClearAll()
-    {
-        _bits.Clear();
-    }
-
-    /// <summary>
-    /// Creates a <see cref="Span{T}"/> to access the <see cref="_bits"/>.
-    /// </summary>
-    /// <returns>The hash.</returns>
-    public Span<uint> AsSpan()
-    {
-        return _bits;
-    }
-
-    /// <summary>
-    /// Copies the bits into a <see cref="Span{T}"/> and returns a slice containing the copied <see cref="_bits"/>.
-    /// </summary>
-    /// <param name=""></param>
-    /// <returns>The hash.</returns>
-    public Span<uint> AsSpan(Span<uint> span, bool zero = true)
-    {
-        // Prevent exception because target array is to small for copy operation
-        var length = Math.Min(this._bits.Length, span.Length);
-        for (var index = 0; index < length; index++)
-        {
-            span[index] = _bits[index];
-        }
-
-        // Zero the rest space which was not overriden due to the copy.
-        for (var index = length; zero && index < span.Length; index++)
-        {
-            span[index] = 0;
-        }
-
-        return span[.._bits.Length];
-    }
-
-    /// <summary>
-    /// Calculates the hash, this is unique for the set bits. Two <see cref="BitSet"/> with the same set bits, result in the same hash.
-    /// </summary>
-    /// <returns>The hash.</returns>
-    public override int GetHashCode()
-    {
-        return Component.GetHashCode(AsSpan());
-    }
-
-    /// <summary>
-    /// Prints the content of this instance.
-    /// </summary>
-    /// <returns>The string.</returns>
-    public override string ToString()
-    {
-        // Convert uint to binary form for pretty printing
-        var binaryBuilder = new StringBuilder();
-        foreach (var bit in _bits)
-        {
-            binaryBuilder.Append(Convert.ToString((uint)bit, 2).PadLeft(32, '0')).Append(',');
-        }
-        binaryBuilder.Length--;
-
-        return $"{nameof(_bits)}: {string.Join(",", binaryBuilder)}";
-    }
-}

Ghost.ArchetypeEntities/Helpers/ThreadLocker.cs

@@ -1,7 +0,0 @@
-namespace Ghost.Entities.Helpers;
-
-internal static class ThreadLocker
-{
-    private static Lock? _worldLock;
-    public static Lock WorldLock => _worldLock ??= new();
-}

Ghost.ArchetypeEntities/Registries/ComponentRegistry.cs

@@ -1,22 +0,0 @@
-namespace Ghost.Entities.Registries;
-
-internal static class ComponentRegistry
-{
-    private static readonly Dictionary<Type, ComponentData> _hashCodeToComponentMap = new(64);
-
-    public static unsafe ComponentData GetOrAdd<T>()
-        where T : unmanaged, IComponent
-    {
-        var type = typeof(T);
-        if (_hashCodeToComponentMap.TryGetValue(type, out var data))
-        {
-            return data;
-        }
-
-        var id = (ushort)_hashCodeToComponentMap.Count;
-        data = new ComponentData(id, sizeof(T));
-        _hashCodeToComponentMap.Add(type, data);
-
-        return data;
-    }
-}

Ghost.ArchetypeEntities/Services/EntityChangeQueue.cs

@@ -1,6 +0,0 @@
-namespace Ghost.Entities.Services;
-
-internal class EntityChangeQueue
-{
-    // TODO: This class is not implemented yet.
-}

Ghost.ArchetypeEntities/Signature.cs

@@ -1,53 +0,0 @@
-using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Helpers;
-
-namespace Ghost.Entities;
-
-internal struct Signature : IDisposable, IEquatable<Signature>
-{
-    public UnsafeArray<ComponentData> componentDatas;
-    private int _hashCode;
-
-    public Signature(params Span<ComponentData> components)
-    {
-        componentDatas = new UnsafeArray<ComponentData>(components.Length, Allocator.Persistent);
-        componentDatas.CopyFrom(components);
-
-        _hashCode = -1;
-        _hashCode = GetHashCode();
-    }
-
-    public bool Equals(Signature other)
-    {
-        return GetHashCode() == other.GetHashCode();
-    }
-
-    public override bool Equals(object? obj)
-    {
-        if (obj is Signature other)
-        {
-            return Equals(other);
-        }
-
-        return false;
-    }
-
-    public override int GetHashCode()
-    {
-        if (_hashCode != -1)
-        {
-            return _hashCode;
-        }
-
-        unchecked
-        {
-            _hashCode = Component.GetHashCode(componentDatas.AsSpan());
-            return _hashCode;
-        }
-    }
-
-    public void Dispose()
-    {
-        componentDatas.Dispose();
-    }
-}