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 → UiText (behavioral text widget) ────────────────────

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

    // ── 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);
    }
}