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

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

    [Fact]
    public void Click_InvokesOnClick()
    {
        var b = new UiButton(new ElementInfo { Type = 1, Width = 46, Height = 18 }, NoTex)
        { OnClick = () => _clicked = true };
        b.OnEvent(new UiEvent(0, null, UiEventType.Click));
        Assert.True(_clicked);
    }

    [Fact]
    public void Click_ProvidesLocalCoordinatesToPositionAwareHandler()
    {
        (int X, int Y) clicked = default;
        var b = new UiButton(new ElementInfo { Type = 1, Width = 46, Height = 18 }, NoTex)
        {
            OnClickAt = (x, y) => clicked = (x, y),
        };

        b.OnEvent(new UiEvent(0, b, UiEventType.Click, Data1: 17, Data2: 9));

        Assert.Equal((17, 9), clicked);
    }

    [Fact]
    public void DoubleClick_IsOptInAndDisabledButtonsSwallowWithoutInvoking()
    {
        int activations = 0;
        var button = new UiButton(
            new ElementInfo { Type = 1, Width = 46, Height = 18 },
            NoTex);
        var doubleClick = new UiEvent(
            0,
            button,
            UiEventType.DoubleClick);

        Assert.False(button.OnEvent(doubleClick));

        button.OnDoubleClick = () => activations++;
        Assert.True(button.OnEvent(doubleClick));
        Assert.Equal(1, activations);

        button.Enabled = false;
        Assert.True(button.OnEvent(doubleClick));
        Assert.Equal(1, activations);
    }

    [Fact]
    public void PointerDownAndUp_InvokeDistinctTransitionHandlers()
    {
        var transitions = new List<string>();
        var b = new UiButton(new ElementInfo { Type = 1, Width = 20, Height = 20 }, NoTex)
        {
            Width = 20,
            Height = 20,
            OnPressed = () => transitions.Add("pressed"),
            OnReleased = () => transitions.Add("released"),
        };

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));
        b.OnEvent(new UiEvent(0, b, UiEventType.MouseUp, Data1: 30, Data2: 30));

        Assert.Equal(["pressed", "released"], transitions);
    }

    [Fact]
    public void NotClickThrough_SoItReceivesClicks()
    {
        var b = new UiButton(new ElementInfo { Type = 1 }, NoTex);
        Assert.False(b.ClickThrough);
    }

    [Fact]
    public void PointerTransitions_UseRetailNormalStates()
    {
        var b = ButtonWithStates("Normal", "Normal_rollover", "Normal_pressed");

        b.OnEvent(new UiEvent(0, b, UiEventType.HoverEnter));
        Assert.Equal("Normal_rollover", b.ActiveState);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));
        Assert.Equal("Normal_pressed", b.ActiveState);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseMove, Data1: 50, Data2: 50));
        Assert.Equal("Normal_rollover", b.ActiveState);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseMove, Data1: 5, Data2: 5));
        Assert.Equal("Normal_pressed", b.ActiveState);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseUp, Data1: 5, Data2: 5));
        Assert.Equal("Normal_rollover", b.ActiveState);
    }

    [Fact]
    public void ToggleRelease_SelectsHighlightState()
    {
        var info = ButtonInfo("Normal", "Highlight");
        AddBoolProperty(info, 0x0Bu, true);
        var b = CreateButton(info);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));
        b.OnEvent(new UiEvent(0, b, UiEventType.MouseUp, Data1: 5, Data2: 5));

        Assert.True(b.Selected);
        Assert.Equal("Highlight", b.ActiveState);
    }

    [Fact]
    public void SuppressSelfToggle_PressReleaseDoesNotFlipSelected()
    {
        // CH6a/b REJECT-review SHOULD-FIX 3: the chat-window 1-4 indicators
        // (0x10000522-0x10000525) carry DAT property 0x0B (ToggleBehavior) =
        // true — same shape as ToggleRelease_SelectsHighlightState above —
        // but retail's own click dispatch has no case for their element ids
        // (gmMainChatUI::ListenToElementMessage @0x004CDA80), so a click must
        // NOT flip their Selected mirror. Only SetIndicatorOpen (an external
        // writer) may change it.
        var info = ButtonInfo("Normal", "Highlight");
        AddBoolProperty(info, 0x0Bu, true);
        var b = CreateButton(info);
        b.SuppressSelfToggle = true;

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));
        b.OnEvent(new UiEvent(0, b, UiEventType.MouseUp, Data1: 5, Data2: 5));

        Assert.False(b.Selected);
        Assert.Equal("Normal", b.ActiveState);

        // The external mirror path still works — SuppressSelfToggle only
        // blocks the self-click, not a producer's own write.
        b.Selected = true;
        Assert.True(b.Selected);
        Assert.Equal("Highlight", b.ActiveState);
    }

    [Fact]
    public void DisabledProperty_SelectsGhostedAndSuppressesClick()
    {
        var info = ButtonInfo("Normal", "Ghosted");
        AddBoolProperty(info, 0x0Du, true);
        var b = CreateButton(info);
        b.OnClick = () => _clicked = true;

        b.OnEvent(new UiEvent(0, b, UiEventType.Click));

        Assert.False(b.Enabled);
        Assert.Equal("Ghosted", b.ActiveState);
        Assert.False(_clicked);
    }

    [Fact]
    public void MissingStandardState_PreservesCustomSemanticState()
    {
        var info = ButtonInfo("LockedUI");
        info.DefaultStateName = "LockedUI";
        var b = CreateButton(info);

        b.OnEvent(new UiEvent(0, b, UiEventType.HoverEnter));
        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));

        Assert.Equal("LockedUI", b.ActiveState);
    }

    [Fact]
    public void PropertyOnlyPressedState_PreservesDrawableNormalFace()
    {
        var info = ButtonInfo("Normal", "Highlight");
        info.States[UiButtonStateMachine.NormalPressed] = new UiStateInfo
        {
            Id = UiButtonStateMachine.NormalPressed,
            Name = "Normal_pressed",
        };
        var b = CreateButton(info);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));

        Assert.Equal("Normal", b.ActiveState);
    }

    [Fact]
    public void DirectStateCascade_WithoutRealMedia_DoesNotBlankAnAlreadyResolvedState()
    {
        // #382: LayoutImporter.BuildWidget's post-attach state reapply cascades a
        // PARENT's PassToChildren DirectState to EVERY IUiDatStateful child (the
        // chat window's indicator-button backing panel, 0x10000600, authors exactly
        // this). Every button structurally carries a DirectStateId entry in its own
        // States dict purely as the property bag for ToggleBehavior/RolloverEnabled/
        // etc (see AddBoolProperty below) — that structural presence must NOT be
        // enough to accept a DirectState transition when the button has no real ""
        // media, or an ancestor's unrelated cascade blanks an already-correct
        // "Normal" resolution before first paint.
        var info = ButtonInfo("Normal", "Highlight");
        AddBoolProperty(info, 0x13u, true); // RolloverEnabled — populates States[DirectStateId]
        var b = CreateButton(info);
        Assert.Equal("Normal", b.ActiveState);

        bool ok = b.TrySetRetailState(UiStateInfo.DirectStateId);

        Assert.False(ok);
        Assert.Equal("Normal", b.ActiveState);
    }

    [Fact]
    public void DirectStateTransition_WithRealMedia_StillSucceeds()
    {
        // The companion positive case: a button that legitimately authors ""
        // (DirectState) media must still be able to transition to it explicitly —
        // the fix narrows the check to "has real media", it does not disable the
        // DirectState branch outright.
        var info = ButtonInfo("Normal");
        info.StateMedia[""] = (7u, 1);
        var b = CreateButton(info);

        bool ok = b.TrySetRetailState(UiStateInfo.DirectStateId);

        Assert.True(ok);
        Assert.Equal("", b.ActiveState);
    }

    [Fact]
    public void HotClick_FiresImmediatelyRepeatsAndSuppressesReleaseClick()
    {
        var info = ButtonInfo("Normal");
        AddBoolProperty(info, 0x0Fu, true);
        AddFloatProperty(info, 0x10u, 0.10f);
        AddFloatProperty(info, 0x11u, 0.05f);
        int clicks = 0;
        var b = CreateButton(info);
        b.OnClick = () => clicks++;

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseDown, Data1: 5, Data2: 5));
        Assert.Equal(1, clicks);
        b.OnGlobalUiTime(1.00);
        b.OnGlobalUiTime(1.09);
        Assert.Equal(1, clicks);
        b.OnGlobalUiTime(1.11);
        Assert.Equal(2, clicks);

        b.OnEvent(new UiEvent(0, b, UiEventType.MouseUp, Data1: 5, Data2: 5));
        b.OnEvent(new UiEvent(0, b, UiEventType.Click, Data1: 5, Data2: 5));
        Assert.Equal(2, clicks);
    }

    /// <summary>
    /// GF-1/GF-8 (Campaign CC gate round 1 Batch B): the "gender button"
    /// shape — retail's custom Unselected/Selected radio-pair media authored
    /// DIRECTLY on the button's own StateMedia (no separate face-segment
    /// child), live-DAT-measured on 0x100003A7/0x100003A8 (Female/Male).
    /// Before this fix, .Selected committed nothing: the standard
    /// AddAvailableStates loop never recognized the "Unselected"/"Selected"
    /// names, so _availableStates was empty and UpdateVisualState's
    /// RequestedState (which only ever returns Normal/Highlight/Ghosted ids)
    /// could never match anyway.
    /// </summary>
    [Fact]
    public void CustomSelectionPair_MediaDirectlyOnButton_SelectedTogglesActiveState()
    {
        var info = ButtonInfo("Unselected", "Selected");
        var b = CreateButton(info);

        Assert.Equal("Unselected", b.ActiveState);

        b.Selected = true;
        Assert.Equal("Selected", b.ActiveState);

        b.Selected = false;
        Assert.Equal("Unselected", b.ActiveState);
    }

    /// <summary>
    /// The "heritage/template/sub-tab row" shape — the parent authors the
    /// Unselected/Selected state DESCRIPTORS (property bag only, no media),
    /// and a single stateful child (the radio dot / icon) carries the
    /// actual per-state art, matching <c>FindStatefulFaceChildren</c>'s
    /// name-overlap detection. Live-DAT-measured on the Heritage row
    /// (0x100003BF, dot child 0x100003C0) and the Profession template row
    /// (0x100003D9, icon child 0x100002E9).
    /// </summary>
    [Fact]
    public void CustomSelectionPair_MediaOnFaceChild_SelectedTogglesActiveState()
    {
        var info = new ElementInfo { Type = 1, Width = 305, Height = 32 };
        info.States[UiButtonStateMachine.NormalPressed] = new UiStateInfo
        {
            Id = UiButtonStateMachine.NormalPressed,
            Name = "Normal_pressed",
        };
        info.States[RetailUiStateIds.Unselected] = new UiStateInfo
        {
            Id = RetailUiStateIds.Unselected,
            Name = "Unselected",
        };
        info.States[RetailUiStateIds.Selected] = new UiStateInfo
        {
            Id = RetailUiStateIds.Selected,
            Name = "Selected",
        };
        info.DefaultStateName = "Unselected";

        var dot = new ElementInfo { Type = 3, Width = 32, Height = 32 };
        dot.StateMedia["Unselected"] = (0x06006E35u, 1);
        dot.StateMedia["Selected"] = (0x06006E21u, 1);
        info.Children.Add(dot);

        // Face-child discovery (FindStatefulFaceChildren) is DatWidgetFactory's
        // job, not UiButton's own constructor — go through the real factory
        // path so this fixture matches production exactly (raw CreateButton
        // below bypasses that discovery entirely).
        var b = Assert.IsType<UiButton>(DatWidgetFactory.Create(info, NoTex, null));

        Assert.Equal("Unselected", b.ActiveState);

        b.Selected = true;
        Assert.Equal("Selected", b.ActiveState);
        Assert.Equal(RetailUiStateIds.Selected, b.ActiveRetailStateId);

        b.Selected = false;
        Assert.Equal("Unselected", b.ActiveState);
    }

    /// <summary>
    /// Regression pin: a STANDARD ToggleBehavior button (no Unselected/
    /// Selected states authored at all — the overwhelming majority of
    /// buttons, including every pre-existing ToggleBehavior consumer) keeps
    /// behaving exactly as before the custom-pair bypass was added.
    /// </summary>
    [Fact]
    public void CustomSelectionPair_Absent_StandardToggleBehaviorUnchanged()
    {
        var info = ButtonInfo("Normal", "Highlight");
        AddBoolProperty(info, 0x0Bu, true);
        var b = CreateButton(info);

        b.Selected = true;
        Assert.Equal("Highlight", b.ActiveState);

        b.Selected = false;
        Assert.Equal("Normal", b.ActiveState);
    }

    /// <summary>
    /// AP-222 / GF-11b (Campaign CC gate round 1 Batch B): per-state label
    /// color/outline reacts to the REQUESTED retail state id even when the
    /// standard art-availability gate never lets ActiveState reach it — the
    /// Appearance spins' exact shape (their arrow face segments carry no
    /// Highlight media at all, so ActiveState is permanently stuck at
    /// "Normal", but the label text must still recolor). Live-DAT-measured
    /// values: Normal (218,167,85), Highlight (255,221,131), outline
    /// off -&gt; on.
    /// </summary>
    [Fact]
    public void PerStateLabelStyle_AppliesEvenWhenActiveStateCannotReachIt()
    {
        var info = ButtonInfo("Normal"); // no Highlight media at all
        AddBoolProperty(info, 0x0Bu, true); // ToggleBehavior
        var b = CreateButton(info);
        b.Label = "Hair Style";
        b.LabelColor = new System.Numerics.Vector4(1f, 1f, 1f, 1f);

        var colors = new Dictionary<uint, System.Numerics.Vector4>
        {
            [UiButtonStateMachine.Normal] = new(218f / 255f, 167f / 255f, 85f / 255f, 1f),
            [UiButtonStateMachine.Highlight] = new(255f / 255f, 221f / 255f, 131f / 255f, 1f),
        };
        var outlines = new Dictionary<uint, bool>
        {
            [UiButtonStateMachine.Normal] = false,
            [UiButtonStateMachine.Highlight] = true,
        };
        b.SetPerStateLabelStyle(colors, outlines);

        Assert.Equal(colors[UiButtonStateMachine.Normal], b.LabelColor);
        Assert.False(b.Outline);

        b.Selected = true;

        // The art stays "Normal" (no Highlight media exists to commit to) —
        // this is the exact AP-222 no-op the standard gate always produced —
        // but the label color/outline must still reach the Highlight values.
        Assert.Equal("Normal", b.ActiveState);
        Assert.Equal(colors[UiButtonStateMachine.Highlight], b.LabelColor);
        Assert.True(b.Outline);
    }

    /// <summary>
    /// Regression pin: a button with NO per-state color map (null, the
    /// overwhelming majority — every existing external post-construction
    /// LabelColor assignment such as ChatWindowController's Send caption or
    /// PaperdollController's Slots label) never has its LabelColor touched
    /// by a state change.
    /// </summary>
    [Fact]
    public void PerStateLabelStyle_Absent_ExternalLabelColorAssignmentSurvivesStateChanges()
    {
        var info = ButtonInfo("Normal", "Highlight");
        AddBoolProperty(info, 0x0Bu, true);
        var b = CreateButton(info);
        var externalColor = new System.Numerics.Vector4(1f, 0.92f, 0.72f, 1f);
        b.LabelColor = externalColor;

        b.Selected = true;
        Assert.Equal("Highlight", b.ActiveState);
        Assert.Equal(externalColor, b.LabelColor);

        b.Selected = false;
        Assert.Equal(externalColor, b.LabelColor);
    }

    private static UiButton ButtonWithStates(params string[] states)
    {
        var info = ButtonInfo(states);
        AddBoolProperty(info, 0x13u, true);
        return CreateButton(info);
    }

    private static ElementInfo ButtonInfo(params string[] states)
    {
        var info = new ElementInfo { Type = 1, Width = 20, Height = 20 };
        uint file = 1;
        foreach (string state in states)
            info.StateMedia[state] = (file++, 1);
        if (states.Length > 0)
            info.DefaultStateName = states[0];
        return info;
    }

    private static void AddBoolProperty(ElementInfo info, uint id, bool value)
    {
        if (!info.States.TryGetValue(UiStateInfo.DirectStateId, out var state))
        {
            state = new UiStateInfo { Id = UiStateInfo.DirectStateId };
            info.States[UiStateInfo.DirectStateId] = state;
        }
        state.Properties.Values[id] = new UiPropertyValue
        {
            Kind = UiPropertyKind.Bool,
            BoolValue = value,
        };
    }

    private static void AddFloatProperty(ElementInfo info, uint id, float value)
    {
        if (!info.States.TryGetValue(UiStateInfo.DirectStateId, out var state))
        {
            state = new UiStateInfo { Id = UiStateInfo.DirectStateId };
            info.States[UiStateInfo.DirectStateId] = state;
        }
        state.Properties.Values[id] = new UiPropertyValue
        {
            Kind = UiPropertyKind.Float,
            FloatValue = value,
        };
    }

    private static UiButton CreateButton(ElementInfo info)
        => new(info, NoTex) { Width = info.Width, Height = info.Height };
}