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);
    }

    // ── 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 → null (style prototype, never rendered) ─────────────

    [Fact]
    public void Type12_StylePrototype_ReturnsNull()
    {
        var e = DatWidgetFactory.Create(new ElementInfo { Type = 12 }, NoTex, null);
        Assert.Null(e);
    }

    // ── 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);
    }

    // ── 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 with own sprites renders; without sprites is skipped ──

    /// <summary>
    /// Task G1 change 1: only PURE Type-12 prototypes (no state media) are skipped.
    /// A Type-12 element that carries its own state media must return a non-null widget.
    /// </summary>
    [Fact]
    public void DatWidgetFactory_Type12WithMedia_Renders()
    {
        // Type 12 with a "Normal" state sprite — must render (NOT skipped).
        var withMedia = new ElementInfo
        {
            Type       = 12,
            Width      = 32,
            Height     = 16,
            StateMedia = { ["Normal"] = (0x00001234u, 1) },
        };
        var e = DatWidgetFactory.Create(withMedia, NoTex, null);
        Assert.NotNull(e);
        Assert.IsType<UiDatElement>(e);

        // Type 12 with NO state media — must still be skipped (pure prototype).
        var noMedia = new ElementInfo { Type = 12 };
        Assert.Null(DatWidgetFactory.Create(noMedia, 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);
    }

    // ── 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);
    }
}