feat(ui): persist retained window layouts

tests/AcDream.App.Tests/UI/RetailWindowLayoutPersistenceTests.cs

@@ -0,0 +1,102 @@
+using AcDream.App.UI;
+using AcDream.UI.Abstractions.Panels.Settings;
+
+namespace AcDream.App.Tests.UI;
+
+public sealed class RetailWindowLayoutPersistenceTests : IDisposable
+{
+    private readonly string _directory = Path.Combine(
+        Path.GetTempPath(), "acdream-window-layout-tests-" + Guid.NewGuid().ToString("N"));
+    private string PathName => Path.Combine(_directory, "settings.json");
+
+    [Fact]
+    public void CompletedInteractions_SaveCompleteCharacterResolutionLayout()
+    {
+        var store = new SettingsStore(PathName);
+        var root = new UiRoot { Width = 800, Height = 600 };
+        RetailWindowHandle handle = Mount(root, "chat");
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "Alice", () => (800, 600));
+
+        handle.MoveTo(44f, 55f);
+        handle.ResizeTo(320f, 180f);
+        handle.Hide();
+
+        UiWindowLayout saved = Assert.IsType<UiWindowLayout>(
+            store.LoadWindowLayout("Alice", "800x600", "chat", default));
+        Assert.Equal((44f, 55f, 320f, 180f), (saved.X, saved.Y, saved.Width, saved.Height));
+        Assert.False(saved.Visible);
+    }
+
+    [Fact]
+    public void Restore_ClampsBoundsAndReappliesPanelStateAndVisibility()
+    {
+        var store = new SettingsStore(PathName);
+        store.SaveWindowLayout(
+            "Alice",
+            "640x480",
+            "chat",
+            new UiWindowLayout(900f, 700f, 500f, 300f, false, false, true));
+
+        var root = new UiRoot { Width = 640, Height = 480 };
+        var state = new FakeWindowState();
+        RetailWindowHandle handle = Mount(root, "chat", state);
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "Alice", () => (640, 480));
+
+        persistence.RestoreAll();
+
+        Assert.Equal((500f, 300f), (handle.Width, handle.Height));
+        Assert.Equal((140f, 180f), (handle.Left, handle.Top));
+        Assert.False(handle.IsVisible);
+        Assert.True(state.Restored.Maximized);
+    }
+
+    [Fact]
+    public void DefaultPreLoginKey_NeverOverwritesCharacterLayouts()
+    {
+        var store = new SettingsStore(PathName);
+        var root = new UiRoot { Width = 800, Height = 600 };
+        RetailWindowHandle handle = Mount(root, "radar");
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "default", () => (800, 600));
+
+        handle.MoveTo(123f, 234f);
+
+        Assert.Null(store.LoadWindowLayout("default", "800x600", "radar", default));
+    }
+
+    private static RetailWindowHandle Mount(
+        UiRoot root,
+        string name,
+        IRetainedWindowStateController? state = null)
+    {
+        var frame = new UiPanel
+        {
+            Left = 10f,
+            Top = 20f,
+            Width = 200f,
+            Height = 100f,
+            MinWidth = 100f,
+            MinHeight = 80f,
+            MaxWidth = 600f,
+            MaxHeight = 400f,
+            Draggable = true,
+            Resizable = true,
+        };
+        root.AddChild(frame);
+        return root.RegisterWindow(name, frame, stateController: state);
+    }
+
+    public void Dispose()
+    {
+        if (Directory.Exists(_directory)) Directory.Delete(_directory, recursive: true);
+    }
+
+    private sealed class FakeWindowState : IRetainedWindowStateController
+    {
+        public RetainedWindowState Restored { get; private set; }
+        public RetainedWindowState CaptureWindowState() => Restored;
+        public void RestoreWindowState(RetainedWindowState state) => Restored = state;
+    }
+}