using System.Numerics;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
namespace AcDream.App.Tests.UI.Layout;

public class DatWidgetFactoryTests
{
    private static (uint, int, int) NoTex(uint _) => (0, 0, 0);

    // ── Test 1: Type 7 → UiMeter ─────────────────────────────────────────────

    [Fact]
    public void Type7_Meter_MakesUiMeter()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 7, Width = 150, Height = 16 }, NoTex, null);
        Assert.IsType<UiMeter>(e);
    }

    [Fact]
    public void RetailRadarClass_MakesUiRadar()
    {
        var e = DatWidgetFactory.Create(
            new ElementInfo { Type = UiRadar.RetailClassId, Width = 120, Height = 140 },
            NoTex,
            null);

        Assert.IsType<UiRadar>(e);
    }

    // ── Test 2: Unknown type → UiDatElement fallback ─────────────────────────

    [Fact]
    public void UnknownType_FallsBackToGeneric()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 999 }, NoTex, null);
        Assert.IsType<UiDatElement>(e);
    }

    // ── Test 3: Type 12 → UiText (behavioral text widget) ────────────────────

    [Fact]
    public void Type12_Text_MakesUiText()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 12, Width = 100, Height = 40 }, NoTex, null);
        var text = Assert.IsType<UiText>(e);
        Assert.False(text.Selectable);
        Assert.True(text.ClickThrough);
        Assert.False(text.AcceptsFocus);
        Assert.False(text.CapturesPointerDrag);
    }

    [Fact]
    public void Type12_EditableProperty_MakesUiFieldInPlace()
    {
        var info = TextInfo(
            (0x16u, Bool(true)),
            (0x20u, Bool(true)),
            (0x27u, Bool(true)),
            (0x1Eu, Integer(80)));

        var field = Assert.IsType<UiField>(DatWidgetFactory.Create(info, NoTex, null));

        Assert.Equal(info.Id, field.ElementId);
        Assert.True(field.OneLine);
        Assert.True(field.Selectable);
        Assert.Equal(80, field.MaxCharacters);
    }

    [Fact]
    public void Type12_SelectableProperty_MakesSelectableUiText()
    {
        var text = Assert.IsType<UiText>(DatWidgetFactory.Create(
            TextInfo((0x27u, Bool(true))),
            NoTex,
            null));

        Assert.True(text.Selectable);
        Assert.False(text.ClickThrough);
        Assert.True(text.AcceptsFocus);
        Assert.True(text.CapturesPointerDrag);
    }

    // ── Test 4: Rect + anchors set from ElementInfo ───────────────────────────

    /// <summary>
    /// A Type-3 element with X=5,Y=21,W=150,H=16, Left=1,Top=1,Right=1 should have
    /// its rect + anchors copied onto the returned widget.
    /// Per UIElement::UpdateForParentSizeChange @0x00462640:
    /// Left=1 → AnchorEdges.Left (near-pin); Top=1 → AnchorEdges.Top;
    /// Right=1 → AnchorEdges.Right (stretch / track parent right); Bottom=0 → neither.
    /// Combined: Left | Top | Right.
    /// </summary>
    [Fact]
    public void RectAndAnchors_SetFromElementInfo()
    {
        var info = new ElementInfo
        {
            Type   = 3,
            X      = 5,   Y      = 21,
            Width  = 150, Height = 16,
            Left   = 1,   Top    = 1,
            Right  = 1,   Bottom = 0,
        };
        var e = DatWidgetFactory.Create(info, NoTex, null)!;
        Assert.Equal(5f,   e.Left);
        Assert.Equal(21f,  e.Top);
        Assert.Equal(150f, e.Width);
        Assert.Equal(16f,  e.Height);
        Assert.Equal(AnchorEdges.Left | AnchorEdges.Top | AnchorEdges.Right, e.Anchors);
    }

    [Fact]
    public void ImportedDescendant_PreservesExactRawEdgePolicy()
    {
        var info = new ElementInfo
        {
            Type = 3,
            X = 10,
            Y = 20,
            Width = 30,
            Height = 40,
            Left = 4,
            Top = 3,
            Right = 1,
            Bottom = 0,
            OriginalParentWidth = 100,
            OriginalParentHeight = 200,
            HasOriginalParentSize = true,
        };

        var element = DatWidgetFactory.Create(info, NoTex, null)!;
        var policy = Assert.IsType<UiLayoutPolicy>(element.LayoutPolicy);

        Assert.Equal(4u, policy.LeftMode);
        Assert.Equal(3u, policy.TopMode);
        Assert.Equal(1u, policy.RightMode);
        Assert.Equal(0u, policy.BottomMode);
        Assert.Equal(new UiPixelRect(0, 0, 99, 199), policy.OriginalParent);
    }

    [Fact]
    public void ImportedRoot_HasNoRawEdgePolicy()
    {
        var element = DatWidgetFactory.Create(
            new ElementInfo { Type = 3, Width = 100, Height = 200 },
            NoTex,
            null)!;

        Assert.Null(element.LayoutPolicy);
    }

    [Fact]
    public void Create_PropagatesStateCursors()
    {
        var info = new ElementInfo { Type = 3 };
        info.StateCursors["Drag_rollover_accept"] = new UiCursorMedia(0x06008888u, 7, 8);

        var e = DatWidgetFactory.Create(info, NoTex, null)!;

        Assert.Equal(new UiCursorMedia(0x06008888u, 7, 8),
            e.CursorForState("Drag_rollover_accept", allowFallback: false));
    }

    // ── Test 5: ReadOrder propagated to ZOrder ───────────────────────────────

    [Fact]
    public void Create_PropagatesReadOrderToZOrder()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 3, ReadOrder = 7 }, NoTex, null);
        Assert.Equal(7, e!.ZOrder);
    }

    // ── Test G1a: Type 12 always produces UiText (with or without own sprites) ──

    [Fact]
    public void DatWidgetFactory_Type12_AlwaysMakesUiText()
    {
        var withMedia = new ElementInfo { Type = 12, Width = 32, Height = 16,
            StateMedia = { ["Normal"] = (0x00001234u, 1) } };
        Assert.IsType<UiText>(DatWidgetFactory.Create(withMedia, NoTex, null));
        Assert.IsType<UiText>(DatWidgetFactory.Create(new ElementInfo { Type = 12 }, NoTex, null));
    }

    // ── Test 5c: Type 1 → UiButton ──────────────────────────────────────────

    [Fact]
    public void Type1_Button_MakesUiButton()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 1, Width = 46, Height = 18 }, NoTex, null);
        Assert.IsType<UiButton>(e);
    }

    // ── Test 5b: Type 11 → UiScrollbar ──────────────────────────────────────

    [Fact]
    public void Type11_Scrollbar_MakesUiScrollbar()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 11, Width = 16, Height = 68 }, NoTex, null);
        Assert.IsType<UiScrollbar>(e);
    }

    [Fact]
    public void Type11_HorizontalScrollbar_usesDirectRetailTrackAndThumbChildren()
    {
        const uint Track = 0x06004CF6u;
        const uint Thumb = 0x06005DC3u;
        var info = new ElementInfo { Type = 11, Id = 0x100001A4u, Width = 90, Height = 14 };
        var track = new ElementInfo { Id = 4u, Type = 3u, Width = 90, Height = 14 };
        track.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(Track, 1) };
        var thumb = new ElementInfo { Id = 1u, Type = 3u, Width = 16, Height = 14 };
        thumb.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(Thumb, 1) };
        info.Children.Add(track);
        info.Children.Add(thumb);

        var bar = Assert.IsType<UiScrollbar>(DatWidgetFactory.Create(info, NoTex, null));

        Assert.True(bar.Horizontal);
        Assert.Equal(Track, bar.TrackSprite);
        Assert.Equal(Thumb, bar.ThumbSprite);
        Assert.Equal(0u, bar.UpSprite);
        Assert.Equal(0u, bar.DownSprite);
    }

    [Fact]
    public void RetailToolbarFixture_buildsEditableStackEntry_andAuthoredHorizontalSlider()
    {
        ImportedLayout layout = FixtureLoader.LoadToolbar();

        var entry = Assert.IsType<UiField>(layout.FindElement(0x100001A3u));
        Assert.True(entry.RightAligned);
        var bar = Assert.IsType<UiScrollbar>(layout.FindElement(0x100001A4u));
        Assert.True(bar.Horizontal);
        Assert.Equal(0x06004CF6u, bar.TrackSprite);
        Assert.Equal(0x06005DC3u, bar.ThumbSprite);
    }

    // ── Test 5e: Type 3 is NOT registered — chrome/containers stay generic ────
    //
    // Retail Type 3 = UIElement_Field, but acdream's Type-3 dat elements (vitals/chat
    // bevel chrome + the transcript/input container panels) are inert sprite-bearing
    // chrome, not editable fields. They stay on the UiDatElement fallback so their
    // sprites render and they gain no spurious focus/edit affordance. The one true
    // editable field (the chat input, 0x10000016) resolves to Type 12 and is
    // controller-placed as a UiField. Register Type 3 → UiField only when a window
    // carries a factory-built editable Type-3 field.

    [Fact]
    public void Type3_NotRegistered_FallsBackToGeneric()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 3, Width = 200, Height = 16 }, NoTex, null);
        Assert.IsType<UiDatElement>(e);
    }

    // ── Test 5d: Type 6 → UiMenu ─────────────────────────────────────────────

    [Fact]
    public void Type6_Menu_MakesUiMenu()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 6, Width = 46, Height = 18 }, NoTex, null);
        Assert.IsType<UiMenu>(e);
    }

    // ── Test 7: Type 0x10000031 → UiItemList ────────────────────────────────

    [Fact]
    public void Create_buildsUiItemList_forItemListClassId()
    {
        var info = new AcDream.App.UI.Layout.ElementInfo { Id = 0x100001A7u, Type = 0x10000031u, Width = 32, Height = 32 };
        var w = AcDream.App.UI.Layout.DatWidgetFactory.Create(info, _ => (0u, 0, 0), null);
        Assert.IsType<AcDream.App.UI.UiItemList>(w);
    }

    // ── Test M1: Single-image meter (toolbar selected-object meters) ────────
    //
    // The toolbar health/mana meters (0x100001A1 / 0x100001A2) use a DIFFERENT
    // shape from the vitals 3-slice meters: the back-track sprite lives on the
    // meter ELEMENT's own DirectState ("" key), and there is exactly ONE Type-3
    // child whose own DirectState ("" key) carries the fill sprite.  That child
    // has no image grandchildren, so SliceIds would return all-zero — the new
    // Count==1 branch reads the StateMedia entries directly instead.
    // The sprites go in the TILE slot (Back/FrontTile), NOT the cap slot: DrawMode=Normal
    // tiles at native width across the full bar geometry (UIElement_Meter::DrawChildren),
    // so the back spans all 140px and the fill clips to 140*fraction for any native width.
    // Back/FrontLeft + Back/FrontRight must be 0 (no caps on a single-image bar).

    [Fact]
    public void BuildMeter_SingleImageShape_ReadsDirectStateFromElementAndFillChild()
    {
        const uint BackFile = 0x0600193Eu;  // health back-track (from toolbar dump)
        const uint FillFile = 0x0600193Fu;  // health fill (from toolbar dump)

        // Meter element: Type 7, own DirectState = back-track sprite.
        var meter = new ElementInfo { Type = 7, Id = 0x100001A1u, Width = 140, Height = 31 };
        meter.StateMedia[""] = (BackFile, 1);

        // Single Type-3 fill container: own DirectState = fill sprite, no grandchildren.
        var fillContainer = new ElementInfo { Type = 3, ReadOrder = 1 };
        fillContainer.StateMedia[""] = (FillFile, 1);
        meter.Children.Add(fillContainer);

        var e = DatWidgetFactory.Create(meter, NoTex, null);

        var m = Assert.IsType<UiMeter>(e);
        // Back-track on the meter element's own DirectState, fill on the single child —
        // both in the TILE slot so they tile across the full 140px bar (DrawMode=Normal).
        Assert.Equal(BackFile, m.BackTile);
        Assert.Equal(0u,       m.BackLeft);
        Assert.Equal(0u,       m.BackRight);
        Assert.Equal(FillFile, m.FrontTile);
        Assert.Equal(0u,       m.FrontLeft);
        Assert.Equal(0u,       m.FrontRight);
    }

    // ── Test 6: Meter slice extraction (the important one) ───────────────────

    /// <summary>
    /// A meter (Type 7) whose two Type-3 containers each carry 3 image children
    /// (ordered by X, bearing a DirectState "" sprite), plus the front container
    /// has a fourth expand-overlay child with ONLY a named "ShowDetail" state —
    /// that overlay must be excluded from the slice count.
    /// </summary>
    [Fact]
    public void MeterSliceExtraction_ReadsGrandchildImageIds_IgnoresOverlay()
    {
        // Slice ids sourced from format doc §11 — real health-bar ids.
        const uint BackL = 0x0600747Eu, BackT = 0x0600747Fu, BackR = 0x06007480u;
        const uint FrontL = 0x06007481u, FrontT = 0x06007482u, FrontR = 0x06007483u;
        const uint OverlayFile = 0x06007490u;

        // Back container (ReadOrder 0 — drawn first / behind)
        var backChild = new ElementInfo { Type = 3, ReadOrder = 0 };
        backChild.Children.Add(new ElementInfo { X = 0,   StateMedia = { [""] = (BackL,  1) } });
        backChild.Children.Add(new ElementInfo { X = 10,  StateMedia = { [""] = (BackT,  1) } });
        backChild.Children.Add(new ElementInfo { X = 140, StateMedia = { [""] = (BackR,  1) } });

        // Front container (ReadOrder 1 — drawn on top)
        var frontChild = new ElementInfo { Type = 3, ReadOrder = 1 };
        frontChild.Children.Add(new ElementInfo { X = 0,   StateMedia = { [""] = (FrontL, 1) } });
        frontChild.Children.Add(new ElementInfo { X = 10,  StateMedia = { [""] = (FrontT, 1) } });
        frontChild.Children.Add(new ElementInfo { X = 140, StateMedia = { [""] = (FrontR, 1) } });
        // Expand-detail overlay: named state only — NO DirectState "" — must be ignored.
        frontChild.Children.Add(new ElementInfo
        {
            X = 0,
            StateMedia = { ["ShowDetail"] = (OverlayFile, 3) }
        });

        var meter = new ElementInfo { Type = 7, Width = 150, Height = 16 };
        meter.Children.Add(backChild);
        meter.Children.Add(frontChild);

        var e = DatWidgetFactory.Create(meter, NoTex, null);

        var m = Assert.IsType<UiMeter>(e);
        Assert.Equal(BackL,  m.BackLeft);
        Assert.Equal(BackT,  m.BackTile);
        Assert.Equal(BackR,  m.BackRight);
        Assert.Equal(FrontL, m.FrontLeft);
        Assert.Equal(FrontT, m.FrontTile);
        Assert.Equal(FrontR, m.FrontRight);
        // Overlay (ShowDetail-only, no DirectState "") must not leak into any slice slot.
        Assert.NotEqual(OverlayFile, m.FrontRight);
        Assert.NotEqual(OverlayFile, m.FrontTile);
    }

    // ── Justification build-time application (new for importer Fix A) ────────

    /// <summary>
    /// A Type-12 text element with HJustify=Center (the default) must produce a
    /// UiText with Centered=true and RightAligned=false at build time.
    /// This proves BuildText applies the dat's HJustify at construction without a
    /// controller binding step.
    /// </summary>
    [Fact]
    public void BuildText_HJustifyCenter_SetsCentered()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, HJustify = HJustify.Center };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.True(t.Centered);
        Assert.False(t.RightAligned);
        Assert.Equal(VJustify.Center, t.VerticalJustify);
    }

    /// <summary>
    /// A Type-12 text element with HJustify=Right must produce a UiText with
    /// Centered=false and RightAligned=true at build time.
    /// </summary>
    [Fact]
    public void BuildText_HJustifyRight_SetsRightAligned()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, HJustify = HJustify.Right };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.False(t.Centered);
        Assert.True(t.RightAligned);
    }

    /// <summary>
    /// A Type-12 text element with HJustify=Left must produce a UiText with
    /// Centered=false and RightAligned=false at build time.
    /// </summary>
    [Fact]
    public void BuildText_HJustifyLeft_SetsNeitherCenteredNorRight()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, HJustify = HJustify.Left };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.False(t.Centered);
        Assert.False(t.RightAligned);
    }

    /// <summary>
    /// A Type-12 text element with VJustify=Top must produce a UiText with
    /// VerticalJustify=Top at build time.
    /// </summary>
    [Fact]
    public void BuildText_VJustifyTop_SetsVerticalJustifyTop()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 55, VJustify = VJustify.Top };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.Equal(VJustify.Top, t.VerticalJustify);
    }

    /// <summary>
    /// A controller override: build-time sets Centered=true (HJustify=Center), then
    /// a controller sets Centered=false afterward. The controller's override wins —
    /// this is the backward-compatibility guarantee.
    /// </summary>
    [Fact]
    public void BuildText_ControllerOverrideWinsAfterBuild()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, HJustify = HJustify.Center };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.True(t.Centered);   // build-time value
        t.Centered = false;        // controller override
        Assert.False(t.Centered);  // override wins
    }

    // ── DefaultColor from dat FontColor (importer Fix B) ─────────────────────

    /// <summary>
    /// When ElementInfo.FontColor is set (dat carried 0x1B ColorBaseProperty),
    /// DatWidgetFactory.BuildText must copy it onto UiText.DefaultColor.
    /// </summary>
    [Fact]
    public void BuildText_FontColorPresent_SetsDefaultColor()
    {
        var gold = new Vector4(1f, 0.82f, 0.36f, 1f);
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, FontColor = gold };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.Equal(gold, t.DefaultColor);
    }

    [Fact]
    public void HorizontalScrollbar_PreservesNestedCombatMeterFillSprite()
    {
        var track = new ElementInfo { Id = 4, Type = 3, Width = 507, Height = 14 };
        track.StateMedia[""] = (0x06001919u, 1);
        track.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(0x06001919u, 1) };
        var thumb = new ElementInfo { Id = 1, Type = 1, Width = 12, Height = 14 };
        thumb.StateMedia[""] = (0x06001923u, 1);
        thumb.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(0x06001923u, 1) };
        var fill = new ElementInfo { Id = 2, Type = 3, Width = 507, Height = 14 };
        fill.StateMedia[""] = (0x06001200u, 1);
        fill.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(0x06001200u, 1) };
        var range = new ElementInfo
        {
            Id = 0x100005EFu,
            Type = 3,
            X = 63,
            Width = 407,
            Height = 14,
            OriginalParentWidth = 507,
            OriginalParentHeight = 14,
            HasOriginalParentSize = true,
        };
        range.StateMedia[""] = (0x0600715Eu, 1);
        range.States[UiStateInfo.DirectStateId] = new UiStateInfo
            { Id = UiStateInfo.DirectStateId, Image = new UiImageMedia(0x0600715Eu, 1) };
        var meter = new ElementInfo
        {
            Id = CombatUiController.PowerControlId + 1,
            Type = 7,
            Width = 507,
            Height = 14,
            Children = [fill, range],
        };
        var meterState = new UiStateInfo { Id = UiStateInfo.DirectStateId };
        meterState.Properties.Values[0x6Fu] = new UiPropertyValue
            { Kind = UiPropertyKind.Enum, UnsignedValue = 1u };
        meter.States[UiStateInfo.DirectStateId] = meterState;
        var info = new ElementInfo
        {
            Id = CombatUiController.PowerControlId,
            Type = 11,
            Width = 507,
            Height = 14,
            Children = [track, meter, thumb],
        };

        var bar = Assert.IsType<UiScrollbar>(
            DatWidgetFactory.Create(info, NoTex, null));

        Assert.True(bar.Horizontal);
        Assert.Equal(0x06001919u, bar.TrackSprite);
        Assert.Equal(0x06001923u, bar.ThumbSprite);
        Assert.Equal(0x06001200u, bar.ScalarFillSprite);
        Assert.Equal(0x0600715Eu, bar.ScalarRangeSprite);
        Assert.NotNull(bar.ScalarRangeLayoutPolicy);
        Assert.False(bar.ScalarFillFromRight);
    }

    private static ElementInfo TextInfo(params (uint Id, UiPropertyValue Value)[] properties)
    {
        var info = new ElementInfo { Id = 0x10000016u, Type = 12, Width = 100, Height = 20 };
        var state = new UiStateInfo { Id = UiStateInfo.DirectStateId };
        foreach (var property in properties)
            state.Properties.Values[property.Id] = property.Value;
        info.States[UiStateInfo.DirectStateId] = state;
        return info;
    }

    private static UiPropertyValue Bool(bool value)
        => new() { Kind = UiPropertyKind.Bool, BoolValue = value };

    private static UiPropertyValue Integer(int value)
        => new() { Kind = UiPropertyKind.Integer, IntegerValue = value };

    /// <summary>
    /// When ElementInfo.FontColor is null (dat carried no 0x1B), DefaultColor must
    /// stay at white (Vector4.One) — the backward-compatible default.
    /// </summary>
    [Fact]
    public void BuildText_FontColorAbsent_DefaultColorIsWhite()
    {
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, FontColor = null };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));
        Assert.Equal(Vector4.One, t.DefaultColor);
    }

    /// <summary>
    /// Backward-compat guarantee: a controller that sets LinesProvider with an
    /// explicit per-line color AFTER build is unaffected by DefaultColor.
    /// The controller's per-line color is stored in the Line record, not DefaultColor,
    /// so DefaultColor changing from dat does not touch existing controller bindings.
    /// </summary>
    [Fact]
    public void BuildText_ControllerExplicitLineColor_UnaffectedByDefaultColor()
    {
        // Dat sets a parchment color.
        var parchment = new Vector4(0.92f, 0.90f, 0.82f, 1f);
        var info = new ElementInfo { Type = 12, Width = 100, Height = 20, FontColor = parchment };
        var t = Assert.IsType<UiText>(DatWidgetFactory.Create(info, NoTex, null));

        // Controller overrides with an explicit gold color in the Line record.
        var gold = new Vector4(1f, 0.82f, 0.36f, 1f);
        t.LinesProvider = () => new[] { new UiText.Line("text", gold) };

        // The line's color is gold (controller wins), NOT the dat parchment.
        Assert.Equal(gold, t.LinesProvider()[0].Color);
        // DefaultColor still holds the dat parchment (unmodified by the controller binding).
        Assert.Equal(parchment, t.DefaultColor);
    }
}