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

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

    // ── 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 ───────────────────────

    /// <summary>Bind adds exactly 9 UiPanel row containers to the list box.</summary>
    [Fact]
    public void Bind_AttributeList_Has9Rows()
    {
        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);
    }

    /// <summary>
    /// Every row must have a right-aligned value UiText child (the last UiText in
    /// the row), confirming the RightAligned path was wired.
    /// </summary>
    [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)
        {
            // Last UiText in each row is the value (right-aligned).
            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];   // last = value
            Assert.True(valueEl.RightAligned, "value label must be RightAligned");
        }
    }

    /// <summary>
    /// Retail display order: Strength, Endurance, Coordination, Quickness, Focus, Self,
    /// Health, Stamina, Mana (spec §1). Name is the SECOND UiText child of each row.
    /// </summary>
    [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++)
        {
            // Name UiText = second UiText in the row (after the icon UiText).
            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;   // index 1 = name (0 = icon)
            Assert.Equal(expectedNames[i], rowName);
        }
    }

    /// <summary>
    /// Attribute row values are plain integers; vital row values are "cur/max".
    /// Validates against SampleData fixture: Str=200, Quick=200, rest=10;
    /// Health=5/5, Stamina=10/10, Mana=10/10.
    /// </summary>
    [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();

        // Helper: value text is the last UiText in the row.
        string ValueOf(UiPanel row) => row.Children.OfType<UiText>().ToList()[^1].LinesProvider()[0].Text;

        // Attribute rows 0-5.
        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

        // Vital rows 6-8: "cur/max" format.
        Assert.Equal("5/5",   ValueOf(rows[6]));   // Health
        Assert.Equal("10/10", ValueOf(rows[7]));   // Stamina
        Assert.Equal("10/10", ValueOf(rows[8]));   // Mana
    }

    /// <summary>
    /// When spriteResolve is provided the icon UiText must have BackgroundSprite set
    /// to the correct DataID; when null the BackgroundSprite must be 0.
    /// </summary>
    [Fact]
    public void Bind_AttributeList_IconHasBackgroundSpriteWhenResolverProvided()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        // Non-null resolver — just returns a fake handle for any id.
        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));   // fake: handle == id

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

        // First icon = Strength row; expected DataID 0x060002C8.
        var iconEl = rows[0].Children.OfType<UiText>().First();
        Assert.Equal(0x060002C8u, iconEl.BackgroundSprite);

        // Vital (Health) = row 6; expected DataID 0x06004C3B.
        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_TitleEmpty()
    {
        var title = new UiText();
        var layout = Fake((CharacterStatController.FooterTitleId, title));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal(string.Empty, title.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1LabelEmpty()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal(string.Empty, lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1ValueIsSelectPrompt()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Select an Attribute to Improve", val.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2LabelEmpty()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal(string.Empty, lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2ValueIsSkillCredits()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // SampleData.SampleCharacter().SkillCredits == 96
        Assert.Equal("96", val.LinesProvider()[0].Text);
    }

    // ── SkillCredits propagation through SampleData ───────────────────────────

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

    // ── UiText.RightAligned — unit-level draw mode flag ──────────────────────

    [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);
    }

    // ── Robustness: a partial layout (missing ids) must not throw ────────────

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

    // ── Helper ─────────────────────────────────────────────────────────────

    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);
    }
}