using AcDream.App.Studio;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
using System.Numerics;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// Unit tests for <see cref="CharacterStatController"/> — the Attributes-tab controller that
/// binds the REAL importer-mounted header + 9-row list + footer elements (no created overlay).
/// Pure data wiring against fake layouts; no dats, no GL.
///
/// <para>Pass 1 tests verify header/XP meter/attribute list/footer State-A binding.
/// Pass 2 tests verify: (a) row click → selection toggle; (b) footer State-B content;
/// (c) raise-button affordability; (d) tab button states.</para>
/// </summary>
public class CharacterStatControllerTests
{
    // ── Header labels bind to the sheet ──────────────────────────────────────

    [Fact]
    public void Bind_SetsNameLabel()
    {
        var name = new UiText();
        var layout = Fake((CharacterStatController.NameId, name));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Studio Player", name.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_SetsLevelLabel()
    {
        var level = new UiText();
        var layout = Fake((CharacterStatController.LevelId, level));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("126", level.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_SetsHeritageAndPkLabels()
    {
        var heritage = new UiText();
        var pk       = new UiText();
        var layout   = Fake((CharacterStatController.HeritageId, heritage),
                            (CharacterStatController.PkStatusId, pk));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Female Aluvian Adventurer",  heritage.LinesProvider()[0].Text);
        Assert.Equal("Non-Player Killer", pk.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_WindowChromeButton_InvokesCloseCallback()
    {
        var close = MakeButton(WindowChromeController.CharacterCloseButtonId);
        var layout = Fake((WindowChromeController.CharacterCloseButtonId, close));
        int closes = 0;

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, onClose: () => closes++);
        close.OnEvent(new UiEvent(0u, close, UiEventType.Click));

        Assert.Equal(1, closes);
    }

    [Fact]
    public void CharacterIdentityText_StatHeaderLine_ComposesRetailGenderHeritageTitle()
    {
        var sheet = new CharacterSheet
        {
            Gender = "Female",
            Heritage = "Aluvian",
            Title = "the Adventurer",
        };

        Assert.Equal("Female Aluvian Adventurer", CharacterIdentityText.StatHeaderLine(sheet));
    }

    [Theory]
    [InlineData(1, "Male")]
    [InlineData(2, "Female")]
    [InlineData(0, null)]
    public void CharacterIdentityText_GenderDisplayName_UsesRetailEnum(int value, string? expected)
        => Assert.Equal(expected, CharacterIdentityText.GenderDisplayName(value));

    [Theory]
    [InlineData(1, "Aluvian")]
    [InlineData(2, "Gharu'ndim")]
    [InlineData(5, "Umbraen")]
    [InlineData(13, "Olthoi")]
    [InlineData(99, null)]
    public void CharacterIdentityText_HeritageGroupDisplayName_UsesRetailEnum(int value, string? expected)
        => Assert.Equal(expected, CharacterIdentityText.HeritageGroupDisplayName(value));

    [Fact]
    public void Bind_HeaderElements_UseVisibleAttributesPageWhenIdsAreDuplicated()
    {
        var root = new UiPanel { Width = 300, Height = 600 };
        var attrPage = MakeDatElement(CharacterStatController.AttributesPageId, top: 25, width: 300, height: 575);
        var hiddenPage = MakeDatElement(CharacterStatController.SkillsPageId, top: 25, width: 300, height: 575);

        var visibleName = new UiText { ElementId = CharacterStatController.NameId };
        var hiddenName = new UiText { ElementId = CharacterStatController.NameId };
        var visibleHeritage = new UiText { ElementId = CharacterStatController.HeritageId };
        var hiddenHeritage = new UiText { ElementId = CharacterStatController.HeritageId };
        var visibleLevel = new UiText { ElementId = CharacterStatController.LevelId };
        var hiddenLevel = new UiText { ElementId = CharacterStatController.LevelId };
        var visibleTotalXp = new UiText { ElementId = CharacterStatController.TotalXpId };
        var hiddenTotalXp = new UiText { ElementId = CharacterStatController.TotalXpId };
        var visibleTotalXpLabel = new UiText { ElementId = CharacterStatController.TotalXpLabelId };
        var hiddenTotalXpLabel = new UiText { ElementId = CharacterStatController.TotalXpLabelId };
        var visibleMeter = new UiMeter { ElementId = CharacterStatController.XpMeterId };
        var hiddenMeter = new UiMeter { ElementId = CharacterStatController.XpMeterId };
        var visibleXpNext = new UiText { ElementId = CharacterStatController.XpNextValueId };
        var hiddenXpNext = new UiText { ElementId = CharacterStatController.XpNextValueId };
        visibleMeter.AddChild(visibleXpNext);
        hiddenMeter.AddChild(hiddenXpNext);

        attrPage.AddChild(visibleName);
        attrPage.AddChild(visibleHeritage);
        attrPage.AddChild(visibleLevel);
        attrPage.AddChild(visibleTotalXpLabel);
        attrPage.AddChild(visibleTotalXp);
        attrPage.AddChild(visibleMeter);
        hiddenPage.AddChild(hiddenName);
        hiddenPage.AddChild(hiddenHeritage);
        hiddenPage.AddChild(hiddenLevel);
        hiddenPage.AddChild(hiddenTotalXpLabel);
        hiddenPage.AddChild(hiddenTotalXp);
        hiddenPage.AddChild(hiddenMeter);
        root.AddChild(attrPage);
        root.AddChild(hiddenPage);

        var layout = new ImportedLayout(root, new Dictionary<uint, UiElement>
        {
            [CharacterStatController.NameId] = hiddenName,
            [CharacterStatController.HeritageId] = hiddenHeritage,
            [CharacterStatController.LevelId] = hiddenLevel,
            [CharacterStatController.TotalXpLabelId] = hiddenTotalXpLabel,
            [CharacterStatController.TotalXpId] = hiddenTotalXp,
            [CharacterStatController.XpMeterId] = hiddenMeter,
            [CharacterStatController.XpNextValueId] = hiddenXpNext,
        });

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Studio Player", visibleName.LinesProvider()[0].Text);
        Assert.Equal("Female Aluvian Adventurer", visibleHeritage.LinesProvider()[0].Text);
        Assert.Equal("126", visibleLevel.LinesProvider()[0].Text);
        Assert.Equal("Total Experience (XP):", visibleTotalXpLabel.LinesProvider()[0].Text);
        Assert.Equal((1_250_000_000L).ToString("N0"), visibleTotalXp.LinesProvider()[0].Text);
        Assert.Equal((42_000_000L).ToString("N0"), visibleXpNext.LinesProvider()[0].Text);
        Assert.Empty(hiddenName.LinesProvider());
        Assert.Empty(hiddenXpNext.LinesProvider());
    }

    // ── XP meter fill ────────────────────────────────────────────────────────

    [Fact]
    public void Bind_SetsXpMeterFill()
    {
        var meter = new UiMeter();
        var layout = Fake((CharacterStatController.XpMeterId, meter));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var fill = meter.Fill();
        Assert.NotNull(fill);
        Assert.True(System.MathF.Abs(fill!.Value - 0.63f) < 0.001f, $"expected ~0.63, got {fill}");
    }

    // ── Attribute list — 9 rows in list box 0x1000023D ───────────────────────

    [Fact]
    public void Bind_AttributeList_Has9Rows()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Rows are UiClickablePanel which inherits UiPanel, so OfType<UiPanel> matches.
        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
    }

    [Fact]
    public void Bind_AttributeList_RowsAreClickablePanels()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        Assert.Equal(9, rows.Count);
        // All rows must have an OnClick wired (not null) and ClickThrough = false.
        foreach (var row in rows)
        {
            Assert.NotNull(row.OnClick);
            Assert.False(row.ClickThrough, "clickable row must accept pointer hits");
        }
    }

    [Fact]
    public void Bind_AttributeList_EachRowHasRightAlignedValueLabel()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
        foreach (var row in rows)
        {
            var texts = row.Children.OfType<UiText>().ToList();
            Assert.True(texts.Count >= 2, "each row must have at least name + value UiText");
            var valueEl = texts[^1];
            Assert.True(valueEl.RightAligned, "value label must be RightAligned");
        }
    }

    [Fact]
    public void Bind_AttributeList_RowNamesInRetailOrder()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);

        string[] expectedNames =
        {
            "Strength", "Endurance", "Coordination", "Quickness", "Focus", "Self",
            "Health", "Stamina", "Mana",
        };

        for (int i = 0; i < 9; i++)
        {
            var texts = rows[i].Children.OfType<UiText>().ToList();
            Assert.True(texts.Count >= 2, $"row {i} must have name + value");
            string rowName = texts[1].LinesProvider()[0].Text;
            Assert.Equal(expectedNames[i], rowName);
        }
    }

    [Fact]
    public void Bind_AttributeList_RowValues_AttributeIntegersAndVitalsCurMax()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();

        string ValueOf(UiPanel row) => row.Children.OfType<UiText>().ToList()[^1].LinesProvider()[0].Text;

        Assert.Equal("200", ValueOf(rows[0]));   // Strength
        Assert.Equal("10",  ValueOf(rows[1]));   // Endurance
        Assert.Equal("10",  ValueOf(rows[2]));   // Coordination
        Assert.Equal("200", ValueOf(rows[3]));   // Quickness
        Assert.Equal("10",  ValueOf(rows[4]));   // Focus
        Assert.Equal("10",  ValueOf(rows[5]));   // Self
        Assert.Equal("5/5",   ValueOf(rows[6]));   // Health
        Assert.Equal("10/10", ValueOf(rows[7]));   // Stamina
        Assert.Equal("10/10", ValueOf(rows[8]));   // Mana
    }

    [Fact]
    public void Bind_AttributeList_IconHasBackgroundSpriteWhenResolverProvided()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);

        var iconEl = rows[0].Children.OfType<UiText>().First();
        Assert.Equal(0x060002C8u, iconEl.BackgroundSprite);

        var healthIcon = rows[6].Children.OfType<UiText>().First();
        Assert.Equal(0x06004C3Bu, healthIcon.BackgroundSprite);
    }

    [Fact]
    public void Bind_AttributeList_IconBackgroundSprite_ZeroWhenNoResolver()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, spriteResolve: null);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
        foreach (var row in rows)
        {
            var iconEl = row.Children.OfType<UiText>().First();
            Assert.Equal(0u, iconEl.BackgroundSprite);
        }
    }

    // ── Footer State A ────────────────────────────────────────────────────────

    [Fact]
    public void Bind_FooterStateA_TitleIsSelectPrompt()
    {
        var title = new UiText();
        var layout = Fake((CharacterStatController.FooterTitleId, title));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Initial state (nothing selected): State-A title.
        Assert.Equal("Select an Attribute to Improve", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1LabelIsSkillCreditsAvailable()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Skill Credits Available:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1ValueIsSkillCredits()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("96", val.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2LabelIsUnassignedExperience()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Unassigned Experience:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2ValueIsUnassignedXp()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var expected = (87_757_321_741L).ToString("N0");
        Assert.Equal(expected, val.LinesProvider()[0].Text);
    }

    // ── Pass 2: Row selection → Footer State B ───────────────────────────────

    [Fact]
    public void RowClick_SelectRow4Focus_FooterStateBShowsFocusTitle()
    {
        // Focus is index 4 in AttrRows. SampleData Focus = 10. Cost = 110.
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Simulate a click on row 4 (Focus).
        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        Assert.Equal(9, rows.Count);
        rows[4].OnClick!();

        // Footer title should now be "Focus: 10".
        Assert.Equal("Focus: 10", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine1LabelIsExperienceToRaise()
    {
        var lbl  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine1Label, lbl),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        Assert.Equal("Experience To Raise:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine1ValueIsRaiseCost()
    {
        var val  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine1Value, val),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        // Focus raise cost = 110 (SampleData fixture).
        Assert.Equal((110L).ToString("N0"), val.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine2LabelIsUnassignedExperience()
    {
        var lbl  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine2Label, lbl),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        Assert.Equal("Unassigned Experience:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine2ValueIsUnassignedXp()
    {
        var val  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine2Value, val),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        // UnassignedXp = 87_757_321_741L
        var expected = (87_757_321_741L).ToString("N0");
        Assert.Equal(expected, val.LinesProvider()[0].Text);
    }

    // ── Pass 2: Toggle deselects ──────────────────────────────────────────────

    [Fact]
    public void RowClick_ToggleSameRow_ReturnsToFooterStateA()
    {
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // Select Focus (row 4).
        rows[4].OnClick!();
        Assert.Equal("Focus: 10", title.LinesProvider()[0].Text);

        // Click the same row again → deselect.
        rows[4].OnClick!();
        Assert.Equal("Select an Attribute to Improve", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SwitchRow_UpdatesToNewRow()
    {
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // Select Endurance (row 1, value=10).
        rows[1].OnClick!();
        Assert.Equal("Endurance: 10", title.LinesProvider()[0].Text);

        // Select Self (row 5, value=10).
        rows[5].OnClick!();
        Assert.Equal("Self: 10", title.LinesProvider()[0].Text);
    }

    // ── Pass 2: Row highlight ─────────────────────────────────────────────────

    [Fact]
    public void RowClick_SelectRow_HighlightsSelectedAndClearsOthers()
    {
        var list  = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // All rows start transparent.
        Assert.All(rows, r => Assert.Equal(0f, r.BackgroundColor.W));

        // Select row 2 (Coordination).
        rows[2].OnClick!();
        Assert.NotEqual(0f, rows[2].BackgroundColor.W);    // highlighted
        Assert.Equal(0f,    rows[0].BackgroundColor.W);    // others cleared
        Assert.Equal(0f,    rows[1].BackgroundColor.W);
    }

    [Fact]
    public void RowClick_Deselect_ClearsHighlight()
    {
        var list  = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[2].OnClick!();   // select
        rows[2].OnClick!();   // deselect

        Assert.Equal(0f, rows[2].BackgroundColor.W);
    }

    [Fact]
    public void RowClick_WithSpriteResolve_SelectedRowHasHighlightSprite()
    {
        // When spriteResolve is provided, the selected row must use sprite 0x06001397
        // (retail Button-state-6 dark bar) instead of the translucent gold BackgroundColor.
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        // Minimal sprite resolver — returns a fake non-zero handle so UiPanel draws it.
        static (uint, int, int) FakeResolve(uint id) => (1u, 32, 8);

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: FakeResolve);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[2].OnClick!();

        Assert.Equal(0x06001397u, rows[2].BackgroundSprite);    // selected → sprite
        Assert.Equal(0f,          rows[2].BackgroundColor.W);   // no tint
        Assert.Equal(0u,          rows[0].BackgroundSprite);    // others cleared
        Assert.Equal(0u,          rows[1].BackgroundSprite);
    }

    [Fact]
    public void RowClick_WithSpriteResolve_Deselect_ClearsSprite()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));
        static (uint, int, int) FakeResolve(uint id) => (1u, 32, 8);
        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: FakeResolve);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[2].OnClick!();   // select
        rows[2].OnClick!();   // deselect

        Assert.Equal(0u, rows[2].BackgroundSprite);
    }

    // ── Pass 2: Raise button affordability ───────────────────────────────────

    [Fact]
    public void RaiseButtons_InitiallyHidden()
    {
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.False(btn1.Visible,  "raise×1 must start hidden");
        Assert.False(btn10.Visible, "raise×10 must start hidden");
    }

    [Fact]
    public void RaiseButtons_AffordableRow_ShowsNormalState()
    {
        // Focus row (index 4) cost=110, UnassignedXp=87_757_321_741 → affordable.
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();  // select Focus

        Assert.True(btn1.Visible,  "raise×1 visible on selection");
        Assert.True(btn10.Visible, "raise×10 visible on selection");
        Assert.Equal("Normal", btn1.ActiveState);
        Assert.Equal("Normal", btn10.ActiveState);
    }

    [Fact]
    public void RaiseButtons_OnlyOneAffordable_SplitsOneAndTenStates()
    {
        var btn1 = MakeButton();
        var btn10 = MakeButton();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));
        var sheet = new CharacterSheet
        {
            UnassignedXp = 500L,
            AttributeRaiseCosts = new long[] { 0L, 0L, 0L, 0L, 110L, 0L, 0L, 0L, 0L },
            AttributeRaise10Costs = new long[] { 0L, 0L, 0L, 0L, 1_100L, 0L, 0L, 0L, 0L },
        };

        CharacterStatController.Bind(layout, () => sheet);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        Assert.Equal("Normal", btn1.ActiveState);
        Assert.Equal("Ghosted", btn10.ActiveState);
    }

    [Fact]
    public void RaiseButtons_MaxedRow_ShowsGhostedState()
    {
        // Strength row (index 0) cost=0 → disabled. UnassignedXp is irrelevant.
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        list.Children.OfType<UiClickablePanel>().ToList()[0].OnClick!();  // select Strength (cost=0)

        Assert.True(btn1.Visible,   "raise button visible even when disabled");
        Assert.Equal("Ghosted", btn1.ActiveState);
        Assert.Equal("Ghosted", btn10.ActiveState);
    }

    [Fact]
    public void RaiseButtons_ClickAffordableAttribute_EmitsRaiseRequest()
    {
        var btn1 = MakeButton();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.ListBoxId, list));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, onRaiseRequest: requests.Add);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();
        btn1.OnClick!();

        var request = Assert.Single(requests);
        Assert.Equal(CharacterStatController.RaiseTargetKind.Attribute, request.Kind);
        Assert.Equal(5u, request.StatId);
        Assert.Equal(110L, request.Cost);
        Assert.Equal(1, request.Amount);
    }

    [Fact]
    public void RaiseButtons_ClickAffordableAttribute_KeepsNormalStateUntilCostsRefresh()
    {
        var btn1 = MakeButton();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.ListBoxId, list));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, onRaiseRequest: requests.Add);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();
        Assert.Equal("Normal", btn1.ActiveState);

        btn1.OnClick!();

        Assert.Single(requests);
        Assert.Equal("Normal", btn1.ActiveState);
    }

    [Fact]
    public void RaiseButtons_ClickAffordableVital_EmitsMaxVitalId()
    {
        var btn1 = MakeButton();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.ListBoxId, list));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, onRaiseRequest: requests.Add);

        list.Children.OfType<UiClickablePanel>().ToList()[6].OnClick!();
        btn1.OnClick!();

        var request = Assert.Single(requests);
        Assert.Equal(CharacterStatController.RaiseTargetKind.Vital, request.Kind);
        Assert.Equal(1u, request.StatId);
        Assert.Equal(90L, request.Cost);
        Assert.Equal(1, request.Amount);
    }

    [Fact]
    public void RaiseButtons_ClickUnaffordableTen_DoesNotEmitRequest()
    {
        var btn10 = MakeButton();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));
        var requests = new List<CharacterStatController.RaiseRequest>();
        var sheet = new CharacterSheet
        {
            UnassignedXp = 500L,
            AttributeRaiseCosts = new long[] { 0L, 0L, 0L, 0L, 110L, 0L, 0L, 0L, 0L },
            AttributeRaise10Costs = new long[] { 0L, 0L, 0L, 0L, 1_100L, 0L, 0L, 0L, 0L },
        };

        CharacterStatController.Bind(layout, () => sheet, onRaiseRequest: requests.Add);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();
        btn10.OnClick!();

        Assert.Empty(requests);
    }

    [Fact]
    public void RaiseButtons_Deselect_HidesButtons()
    {
        var btn1   = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[4].OnClick!();  // select
        Assert.True(btn1.Visible);
        rows[4].OnClick!();  // deselect
        Assert.False(btn1.Visible, "raise button hidden after deselect");
    }

    // ── Pass 2: Tab button states ─────────────────────────────────────────────
    // Tab sprites are added to layout.Root (NOT to the tab group elements), so
    // the tab groups keep Children.Count==0 and survive the page-visibility pass.
    // AddTabSpritesToRoot() adds 3 sprite UiTexts + 1 label UiText per tab to the
    // root when a spriteResolve is provided; nothing is added when spriteResolve=null.

    [Fact]
    public void TabButtons_NoSpriteResolve_AddsNoSpriteChildrenToRoot()
    {
        // When spriteResolve is null, AddTabSpritesToRoot is not called — no sprites added.
        var layout = Fake();   // empty fake layout with just the root UiPanel
        int rootChildCountBefore = layout.Root.Children.Count;

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, spriteResolve: null);

        // No extra children added to root when spriteResolve is null.
        Assert.Equal(rootChildCountBefore, layout.Root.Children.Count);
    }

    [Fact]
    public void TabButtons_AttributesGroup_AddsOpenSpriteIdsToRoot()
    {
        // Attributes tab (isOpen=true): 3 sprite children with Open sprite ids on ROOT.
        // The tab group element itself has 0 children (sprites go to root, not the group).
        var layout = Fake();   // minimal fake

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        // Root should contain the Open sprite ids among all tab sprite children.
        var sprites = layout.Root.Children.OfType<UiText>()
            .Where(t => t.BackgroundSprite != 0u).ToList();
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D92u);   // Open left-cap
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D94u);   // Open center
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D96u);   // Open right-cap
    }

    [Fact]
    public void TabButtons_SkillsAndTitles_AddClosedSpriteIdsToRoot()
    {
        // Skills + Titles tabs (isOpen=false): Closed sprite ids appear on root.
        var layout = Fake();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        var sprites = layout.Root.Children.OfType<UiText>()
            .Where(t => t.BackgroundSprite != 0u).ToList();
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D93u);   // Closed left-cap
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D95u);   // Closed center
        Assert.Contains(sprites, t => t.BackgroundSprite == 0x06005D97u);   // Closed right-cap
    }

    [Fact]
    public void TabButtons_WithSpriteResolve_AddsAllThreeTabsToRoot()
    {
        // With spriteResolve: all 3 tabs inject 4 children each (3 sprites + 1 label)
        // = 12 sprite children total across 3 tabs on the root.
        var layout = Fake();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        // 3 tabs × 3 sprites = 9 sprite UiTexts on root.
        var sprites = layout.Root.Children.OfType<UiText>()
            .Where(t => t.BackgroundSprite != 0u).ToList();
        Assert.Equal(9, sprites.Count);
    }

    // ── Affordability helpers (GetRaiseCost) ──────────────────────────────────

    [Fact]
    public void SkillsTab_Click_RebuildsListWithRetailBucketsAndRows()
    {
        var list = new UiPanel { Width = 300 };
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        ClickTab(layout, left: 92f);

        var headerPanels = SkillHeaders(list);
        var headers = headerPanels
            .Select(c => c.Children.OfType<UiText>().First().LinesProvider()[0].Text)
            .ToList();
        Assert.Equal(new[]
        {
            "Specialized Skills",
            "Trained Skills",
            "Untrained Skills",
            "Unusable Skills",
        }, headers);
        Assert.Equal(new[] { 0x06000F90u, 0x06000F86u, 0x06000F98u, 0x06000F89u },
            headerPanels.Select(h => h.BackgroundSprite).ToArray());
        Assert.All(headerPanels, h =>
            Assert.Equal(Vector4.One, h.Children.OfType<UiText>().First().LinesProvider()[0].Color));

        var rows = SkillRows(list);
        Assert.Equal(12, rows.Count);
        Assert.All(rows, row =>
        {
            Assert.Equal(Vector4.Zero, row.BackgroundColor);
            Assert.Equal(0u, row.BackgroundSprite);
            Assert.True(row.UseSelectionBars);
        });
        var rowNames = rows
            .Select(r => r.Children.OfType<UiText>().ToList()[1].LinesProvider()[0].Text)
            .ToList();
        Assert.Equal(new[]
        {
            "Melee Defense", "War Magic",
            "Arcane Lore", "Life Magic", "Missile Weapons",
            "Healing", "Jump", "Loyalty", "Run",
            "Alchemy", "Cooking", "Fletching",
        }, rowNames);

        var meleeTexts = rows[0].Children.OfType<UiText>().ToList();
        Assert.Equal(Vector4.One, meleeTexts[1].LinesProvider()[0].Color);
        Assert.Equal(new Vector4(0.55f, 1f, 0.55f, 1f), meleeTexts[2].LinesProvider()[0].Color);

        var healingTexts = rows[5].Children.OfType<UiText>().ToList();
        Assert.Equal(Vector4.One, healingTexts[1].LinesProvider()[0].Color);
        Assert.Equal(Vector4.One, healingTexts[2].LinesProvider()[0].Color);
    }

    [Fact]
    public void SkillsTab_ClickThenAttributesTab_RestoresAttributeRows()
    {
        var list = new UiPanel { Width = 300 };
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        ClickTab(layout, left: 92f);
        Assert.Equal(12, SkillRows(list).Count);

        ClickTab(layout, left: 0f);
        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        Assert.Equal(9, rows.Count);
        Assert.Equal("Strength", rows[0].Children.OfType<UiText>().ToList()[1].LinesProvider()[0].Text);
    }

    [Fact]
    public void SkillsTab_MouseClick_RebuildsVisibleListWhenListIdIsDuplicated()
    {
        var root = new UiPanel { Width = 300, Height = 600 };
        var attrPage = MakeDatElement(CharacterStatController.AttributesPageId, top: 25, width: 300, height: 575);
        var hiddenPage = MakeDatElement(CharacterStatController.SkillsPageId, top: 25, width: 300, height: 575);
        var name = new UiText();
        var visibleList = MakeDatElement(CharacterStatController.ListBoxId, top: 112, width: 300, height: 398);
        var hiddenDuplicateList = MakeDatElement(CharacterStatController.ListBoxId, top: 112, width: 300, height: 398);

        attrPage.AddChild(name);
        attrPage.AddChild(visibleList);
        hiddenPage.AddChild(hiddenDuplicateList);
        root.AddChild(attrPage);
        root.AddChild(hiddenPage);

        var layout = new ImportedLayout(root, new Dictionary<uint, UiElement>
        {
            [CharacterStatController.NameId] = name,
            // Mirrors the real import: the id dictionary can point at a hidden duplicate.
            [CharacterStatController.ListBoxId] = hiddenDuplicateList,
        });

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        Assert.Equal("Strength", FirstRowName(visibleList));
        Assert.Equal("<no row>", FirstRowName(hiddenDuplicateList));

        var ui = new UiRoot { Width = 300, Height = 600 };
        ui.AddChild(root);
        Assert.IsType<UiClickablePanel>(ui.Pick(132, 12));

        ui.OnMouseDown(UiMouseButton.Left, 132, 12);
        ui.OnMouseUp(UiMouseButton.Left, 132, 12);

        Assert.Equal("Melee Defense", FirstRowName(visibleList));
        Assert.Equal("<no row>", FirstRowName(hiddenDuplicateList));
    }

    [Fact]
    public void SkillsTab_SelectWarMagic_ShowsTrainedSkillFooter()
    {
        var list = new UiPanel { Width = 300 };
        var title = new UiText();
        var l1Label = new UiText();
        var l1Value = new UiText();
        var l2Label = new UiText();
        var l2Value = new UiText();
        var layout = Fake(
            (CharacterStatController.ListBoxId, list),
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.FooterLine1Label, l1Label),
            (CharacterStatController.FooterLine1Value, l1Value),
            (CharacterStatController.FooterLine2Label, l2Label),
            (CharacterStatController.FooterLine2Value, l2Value));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        ClickTab(layout, left: 92f);
        var rows = SkillRows(list);
        rows[1].OnClick!();

        Assert.Equal("War Magic: 285", title.LinesProvider()[0].Text);
        Assert.Equal("Experience To Raise:", l1Label.LinesProvider()[0].Text);
        Assert.Equal((11_100_000L).ToString("N0"), l1Value.LinesProvider()[0].Text);
        Assert.Equal("Unassigned Experience:", l2Label.LinesProvider()[0].Text);
        Assert.Equal((87_757_321_741L).ToString("N0"), l2Value.LinesProvider()[0].Text);
        Assert.Equal(0x06001397u, rows[1].BackgroundSprite);
        Assert.True(rows[1].UseSelectionBars);
        Assert.Equal(Vector4.Zero, rows[1].BackgroundColor);
        Assert.Equal(0u, rows[0].BackgroundSprite);
        Assert.True(rows[0].UseSelectionBars);
        Assert.Equal(Vector4.Zero, rows[0].BackgroundColor);
    }

    [Fact]
    public void SkillsTab_ClickRaiseTen_EmitsSkillRaiseRequest()
    {
        var list = new UiPanel { Width = 300 };
        var btn10 = MakeButton();
        var layout = Fake(
            (CharacterStatController.ListBoxId, list),
            (CharacterStatController.RaiseTenId, btn10));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16),
            onRaiseRequest: requests.Add);

        ClickTab(layout, left: 92f);
        SkillRows(list)[1].OnClick!();
        btn10.OnClick!();

        var request = Assert.Single(requests);
        Assert.Equal(CharacterStatController.RaiseTargetKind.Skill, request.Kind);
        Assert.Equal(34u, request.StatId);
        Assert.Equal(111_000_000L, request.Cost);
        Assert.Equal(10, request.Amount);
    }

    [Fact]
    public void SkillsTab_SelectHealing_ShowsUntrainedSkillFooter()
    {
        var list = new UiPanel { Width = 300 };
        var title = new UiText();
        var l1Label = new UiText();
        var l1Value = new UiText();
        var l2Label = new UiText();
        var l2Value = new UiText();
        var btn1 = MakeButton();
        var layout = Fake(
            (CharacterStatController.ListBoxId, list),
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.FooterLine1Label, l1Label),
            (CharacterStatController.FooterLine1Value, l1Value),
            (CharacterStatController.FooterLine2Label, l2Label),
            (CharacterStatController.FooterLine2Value, l2Value),
            (CharacterStatController.RaiseOneId, btn1));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        ClickTab(layout, left: 92f);
        SkillRows(list)[5].OnClick!();

        Assert.Equal("Healing", title.LinesProvider()[0].Text);
        Assert.Equal("Skill Credits To Raise:", l1Label.LinesProvider()[0].Text);
        Assert.Equal("6", l1Value.LinesProvider()[0].Text);
        Assert.Equal("Skill Credits Available:", l2Label.LinesProvider()[0].Text);
        Assert.Equal("96", l2Value.LinesProvider()[0].Text);
        Assert.True(btn1.Visible);
        Assert.Equal("Normal", btn1.ActiveState);
    }

    [Fact]
    public void SkillsTab_ClickUntrainedSkill_EmitsTrainSkillRequest()
    {
        var list = new UiPanel { Width = 300 };
        var btn1 = MakeButton();
        var layout = Fake(
            (CharacterStatController.ListBoxId, list),
            (CharacterStatController.RaiseOneId, btn1));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16),
            onRaiseRequest: requests.Add);

        ClickTab(layout, left: 92f);
        SkillRows(list)[5].OnClick!();
        btn1.OnClick!();

        var request = Assert.Single(requests);
        Assert.Equal(CharacterStatController.RaiseTargetKind.TrainSkill, request.Kind);
        Assert.Equal(21u, request.StatId);
        Assert.Equal(6L, request.Cost);
        Assert.Equal(1, request.Amount);
    }

    [Fact]
    public void SkillsTab_ClickTrain_RebuildsSelectedSkillAsTrained()
    {
        var list = new UiPanel { Width = 300 };
        var btn1 = MakeButton();
        var btn10 = MakeButton();
        CharacterSheet sheet = new()
        {
            SkillCredits = 10,
            UnassignedXp = 1_000,
            Skills = new[]
            {
                new CharacterSkill(100u, "Train Me", 0x06000001u,
                    CharacterSkillAdvancementClass.Untrained,
                    BaseLevel: 5,
                    CurrentLevel: 5,
                    UsableUntrained: true,
                    TrainedCost: 4,
                    SpecializedCost: 0,
                    RaiseCost: 0,
                    Raise10Cost: 0),
            },
        };
        var layout = Fake(
            (CharacterStatController.ListBoxId, list),
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10));
        var requests = new List<CharacterStatController.RaiseRequest>();

        CharacterStatController.Bind(layout, () => sheet,
            spriteResolve: id => (id, 16, 16),
            onRaiseRequest: request =>
            {
                requests.Add(request);
                sheet = new CharacterSheet
                {
                    SkillCredits = 6,
                    UnassignedXp = 1_000,
                    Skills = new[]
                    {
                        new CharacterSkill(100u, "Train Me", 0x06000001u,
                            CharacterSkillAdvancementClass.Trained,
                            BaseLevel: 5,
                            CurrentLevel: 5,
                            UsableUntrained: true,
                            TrainedCost: 4,
                            SpecializedCost: 0,
                            RaiseCost: 10,
                            Raise10Cost: 100),
                    },
                };
            });

        ClickTab(layout, left: 92f);
        SkillRows(list).Single().OnClick!();
        Assert.False(btn10.Visible);

        btn1.OnClick!();

        var request = Assert.Single(requests);
        Assert.Equal(CharacterStatController.RaiseTargetKind.TrainSkill, request.Kind);
        Assert.Equal("Train Me", SkillRows(list).Single().Children.OfType<UiText>().ToList()[1].LinesProvider()[0].Text);
        Assert.True(btn1.Visible);
        Assert.True(btn10.Visible);
        Assert.Equal("Normal", btn1.ActiveState);
        Assert.Equal("Normal", btn10.ActiveState);
    }

    [Fact]
    public void SkillsTab_BindsCharacterScrollbarToScrollableViewport()
    {
        var root = new UiPanel { Width = 300, Height = 600 };
        var page = new UiPanel { Width = 300, Height = 600 };
        var name = new UiText();
        var list = MakeDatElement(CharacterStatController.ListBoxId, top: 137, width: 300, height: 80);
        var scrollbarShell = MakeDatElement(CharacterStatController.ListScrollbarId, top: 137, width: 16, height: 80);
        scrollbarShell.Left = 281;

        page.AddChild(name);
        page.AddChild(list);
        page.AddChild(scrollbarShell);
        root.AddChild(page);

        var layout = new ImportedLayout(root, new Dictionary<uint, UiElement>
        {
            [CharacterStatController.NameId] = name,
            [CharacterStatController.ListBoxId] = list,
            [CharacterStatController.ListScrollbarId] = scrollbarShell,
        });

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        ClickTab(layout, left: 92f);

        var bar = page.Children.OfType<UiScrollbar>().Single();
        Assert.True(bar.Visible);
        Assert.NotNull(bar.Model);
        Assert.Contains(list.Children, c => c is UiScrollablePanel);
        Assert.False(scrollbarShell.Visible);
    }

    [Fact]
    public void GetRaiseCost_Index4Focus_Returns110()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(110L, CharacterStatController.GetRaiseCost(sheet, 4));
    }

    [Fact]
    public void GetRaiseCost_Amount10Index4Focus_Returns1100()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(1_100L, CharacterStatController.GetRaiseCost(sheet, 4, amount: 10));
    }

    [Fact]
    public void GetRaiseCost_Index0Strength_Returns0()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(0L, CharacterStatController.GetRaiseCost(sheet, 0));
    }

    [Fact]
    public void GetRaiseCost_OutOfRange_Returns0()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(0L, CharacterStatController.GetRaiseCost(sheet, 99));
    }

    // ── GetRowName helper ─────────────────────────────────────────────────────

    [Fact]
    public void GetRowName_Index0_ReturnsStrength()
        => Assert.Equal("Strength", CharacterStatController.GetRowName(0));

    [Fact]
    public void GetRowName_Index4_ReturnsFocus()
        => Assert.Equal("Focus", CharacterStatController.GetRowName(4));

    [Fact]
    public void GetRowName_Index6_ReturnsHealth()
        => Assert.Equal("Health", CharacterStatController.GetRowName(6));

    [Fact]
    public void GetRowName_NegativeIndex_ReturnsEmpty()
        => Assert.Equal(string.Empty, CharacterStatController.GetRowName(-1));

    // ── SampleData sanity ─────────────────────────────────────────────────────

    [Fact]
    public void SampleCharacter_SkillCredits_Is96()
        => Assert.Equal(96, SampleData.SampleCharacter().SkillCredits);

    [Fact]
    public void SampleCharacter_UnassignedXp_IsSet()
        => Assert.Equal(87_757_321_741L, SampleData.SampleCharacter().UnassignedXp);

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_HasNineEntries()
    {
        var costs = SampleData.SampleCharacter().AttributeRaiseCosts;
        Assert.NotNull(costs);
        Assert.Equal(9, costs.Length);
    }

    [Fact]
    public void SampleCharacter_AttributeRaise10Costs_HasNineEntries()
    {
        var costs = SampleData.SampleCharacter().AttributeRaise10Costs;
        Assert.NotNull(costs);
        Assert.Equal(9, costs.Length);
    }

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_FocusAt110()
        => Assert.Equal(110L, SampleData.SampleCharacter().AttributeRaiseCosts[4]);

    [Fact]
    public void SampleCharacter_AttributeRaise10Costs_FocusAt1100()
        => Assert.Equal(1_100L, SampleData.SampleCharacter().AttributeRaise10Costs[4]);

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_StrengthAt0()
        => Assert.Equal(0L, SampleData.SampleCharacter().AttributeRaiseCosts[0]);

    // ── UiText flag sanity ────────────────────────────────────────────────────

    [Fact]
    public void UiText_RightAligned_DefaultFalse()
    {
        var t = new UiText();
        Assert.False(t.RightAligned);
    }

    [Fact]
    public void UiText_RightAligned_CanBeSetTrue()
    {
        var t = new UiText { RightAligned = true };
        Assert.True(t.RightAligned);
    }

    // ── Header captions (new — LevelCaptionId + TotalXpLabelId) ─────────────

    [Fact]
    public void Bind_LevelCaptionId_SetsCharacterLevelText()
    {
        var caption = new UiText();
        var layout  = Fake((CharacterStatController.LevelCaptionId, caption));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // 2-line caption: "Character" (top) / "Level" (bottom) so it fits the 65px element.
        var lines = caption.LinesProvider();
        Assert.True(lines.Count >= 1, "LevelCaption must provide at least one line");
        Assert.Equal("Character", lines[0].Text);
        Assert.False(caption.Centered,      "LevelCaption must be left-justified (Centered=false)");
        Assert.False(caption.RightAligned,  "LevelCaption must be left-justified (RightAligned=false)");
    }

    [Fact]
    public void Bind_TotalXpLabelId_SetsTotalExperienceXpText()
    {
        var lbl    = new UiText();
        var layout = Fake((CharacterStatController.TotalXpLabelId, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Total Experience (XP):", lbl.LinesProvider()[0].Text);
        Assert.False(lbl.Centered,     "TotalXpLabel must be left-justified (Centered=false)");
        Assert.False(lbl.RightAligned, "TotalXpLabel must be left-justified (RightAligned=false)");
    }

    // ── Polish Commit 1: name white, Infinity!, white footer title ─────────────

    [Fact]
    public void Bind_NameColor_IsWhite()
    {
        // Retail: name "Horan" is WHITE, not gold. (2026-06-26 ref)
        var name   = new UiText();
        var layout = Fake((CharacterStatController.NameId, name));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var color = name.LinesProvider()[0].Color;
        Assert.Equal(1f, color.X, precision: 3);
        Assert.Equal(1f, color.Y, precision: 3);
        Assert.Equal(1f, color.Z, precision: 3);
        Assert.Equal(1f, color.W, precision: 3);
    }

    [Fact]
    public void RowClick_MaxedRow_FooterLine1ValueIsInfinity()
    {
        // Strength (index 0) cost=0 → "Infinity!" per retail spec.
        var val  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine1Value, val),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[0].OnClick!();   // Strength

        Assert.Equal("Infinity!", val.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectedFooterTitle_IsWhite()
    {
        // State B footer title must be WHITE (retail 2026-06-26 ref).
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();   // Focus

        var color = title.LinesProvider()[0].Color;
        Assert.Equal(1f, color.X, precision: 3);
        Assert.Equal(1f, color.Y, precision: 3);
        Assert.Equal(1f, color.Z, precision: 3);
        Assert.Equal(1f, color.W, precision: 3);
    }

    [Fact]
    public void Bind_FooterStateA_TitleColor_IsBodyNotWhite()
    {
        // State A title is body (parchment), not white.
        var title  = new UiText();
        var layout = Fake((CharacterStatController.FooterTitleId, title));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Body = (0.92, 0.90, 0.82, 1.0) — check it's not pure white.
        var color = title.LinesProvider()[0].Color;
        Assert.True(color.X < 1f || color.Y < 1f || color.Z < 1f,
            "State-A title should be body/parchment color, not pure white");
    }

    [Fact]
    public void Bind_LevelCaptionId_SetsTwoLines()
    {
        // Retail: level caption is "Character" / "Level" on two lines (not truncated).
        var caption = new UiText();
        var layout  = Fake((CharacterStatController.LevelCaptionId, caption));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var lines = caption.LinesProvider();
        Assert.Equal(2, lines.Count);
        Assert.Equal("Character", lines[0].Text);
        Assert.Equal("Level",     lines[1].Text);
    }

    // ── Robustness ────────────────────────────────────────────────────────────

    [Fact]
    public void Bind_MissingElements_DoesNotThrow()
        => CharacterStatController.Bind(Fake(), SampleData.SampleCharacter);

    // ── Fix 5: XP meter text children bound via FindElement ──────────────────

    /// <summary>
    /// Fix 5: the XP label (0x10000237) is a dat-origin UiText child of the XP meter
    /// (now built by the importer). After Bind(), FindElement must return a UiText with
    /// a LinesProvider that emits "XP for next level:".
    /// </summary>
    [Fact]
    public void Bind_XpMeter_XpNextLabel_IsBoundViaFindElement()
    {
        var meter    = new UiMeter();
        var xpLabel  = new UiText();
        // Attach the label as a child of the meter so it matches the real importer layout.
        meter.AddChild(xpLabel);
        var layout = Fake(
            (CharacterStatController.XpMeterId,    meter),
            (CharacterStatController.XpNextLabelId, xpLabel));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.NotNull(xpLabel.LinesProvider);
        var lines = xpLabel.LinesProvider();
        Assert.Single(lines);
        Assert.Equal("XP for next level:", lines[0].Text);
    }

    /// <summary>
    /// Fix 5: the XP value (0x10000238) is bound to the XpToNextLevel string.
    /// ClickThrough=true and RightAligned=true must be set by the controller.
    /// </summary>
    [Fact]
    public void Bind_XpMeter_XpNextValue_IsBoundViaFindElement()
    {
        var meter    = new UiMeter();
        var xpValue  = new UiText();
        meter.AddChild(xpValue);
        var layout = Fake(
            (CharacterStatController.XpMeterId,    meter),
            (CharacterStatController.XpNextValueId, xpValue));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.NotNull(xpValue.LinesProvider);
        Assert.True(xpValue.ClickThrough, "XP value overlay must be ClickThrough");
        Assert.True(xpValue.RightAligned, "XP value overlay must be RightAligned");

        var lines = xpValue.LinesProvider();
        Assert.Single(lines);
        // XpToNextLevel from SampleData = 42_000_000L formatted as "42,000,000"
        Assert.Equal((42_000_000L).ToString("N0"), lines[0].Text);
    }

    /// <summary>
    /// Fix 5: if XpNextLabelId / XpNextValueId are absent from the layout (the old
    /// ConsumesDatChildren path, or a test layout that doesn't include them), Bind()
    /// must not throw — the meter Fill is still bound.
    /// </summary>
    [Fact]
    public void Bind_XpMeter_MissingTextChildren_DoesNotThrow()
    {
        var meter  = new UiMeter();
        var layout = Fake((CharacterStatController.XpMeterId, meter));

        // No XpNextLabelId or XpNextValueId in the layout.
        var ex = Record.Exception(() =>
            CharacterStatController.Bind(layout, SampleData.SampleCharacter));

        Assert.Null(ex);
        // Fill must still be bound.
        Assert.NotNull(meter.Fill());
    }

    // ── Helpers ──────────────────────────────────────────────────────────────

    private static void ClickTab(ImportedLayout layout, float left)
    {
        var tab = layout.Root.Children.OfType<UiClickablePanel>()
            .Single(p => System.Math.Abs(p.Left - left) < 0.5f
                         && System.Math.Abs(p.Top) < 0.5f
                         && System.Math.Abs(p.Height - 25f) < 0.5f);
        tab.OnClick!();
    }

    private static string FirstRowName(UiElement list)
    {
        var row = Descendants(list).OfType<UiClickablePanel>().FirstOrDefault();
        if (row is null) return "<no row>";
        var texts = row.Children.OfType<UiText>().ToList();
        return texts.Count > 1 ? texts[1].LinesProvider()[0].Text : "<no text>";
    }

    private static List<UiClickablePanel> SkillRows(UiElement list)
        => Descendants(list).OfType<UiClickablePanel>().ToList();

    private static List<UiPanel> SkillHeaders(UiElement list)
        => Descendants(list)
            .Where(c => c is UiPanel and not UiClickablePanel
                        && c.Children.OfType<UiText>().Any())
            .Cast<UiPanel>()
            .ToList();

    private static IEnumerable<UiElement> Descendants(UiElement root)
    {
        foreach (var child in root.Children)
        {
            yield return child;
            foreach (var nested in Descendants(child))
                yield return nested;
        }
    }

    private static UiDatElement MakeDatElement(uint id, float top, float width, float height)
    {
        var info = new ElementInfo
        {
            Id = id,
            Type = 3,
            Y = top,
            Width = width,
            Height = height,
        };
        return new UiDatElement(info, static _ => (0u, 0, 0))
        {
            Top = top,
            Width = width,
            Height = height,
        };
    }

    /// <summary>Manufacture a minimal UiButton with a fake ElementInfo (no dat sprites).</summary>
    private static UiButton MakeButton(uint id = 0u)
    {
        var info = new ElementInfo { Id = id, Type = 1 };
        return new UiButton(info, static _ => (0u, 0, 0));
    }

    private static ImportedLayout Fake(params (uint id, UiElement e)[] items)
    {
        var dict = new Dictionary<uint, UiElement>();
        var root = new UiPanel();
        foreach (var (id, e) in items)
        {
            root.AddChild(e);
            dict[id] = e;
        }
        return new ImportedLayout(root, dict);
    }
}