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

public class UiDatElementTests
{
    [Fact]
    public void ActiveMedia_PrefersNamedStateOverDirect()
    {
        var info = new ElementInfo();
        info.StateMedia[""] = (0x06000001, 1);          // DirectState (DrawMode Normal=1)
        info.StateMedia["ShowDetail"] = (0x06000002, 3); // named (Alphablend=3)
        var e = new UiDatElement(info, _ => (0, 0, 0)) { ActiveState = "ShowDetail" };
        Assert.Equal(0x06000002u, e.ActiveMedia().File);
        Assert.Equal(3, e.ActiveMedia().DrawMode);
        e.ActiveState = "";
        Assert.Equal(0x06000001u, e.ActiveMedia().File);
        Assert.Equal(1, e.ActiveMedia().DrawMode);
    }

    [Fact]
    public void ActiveMedia_NoMedia_ReturnsZero()
    {
        var e = new UiDatElement(new ElementInfo(), _ => (0, 0, 0));
        Assert.Equal(0u, e.ActiveMedia().File);
        Assert.Equal(0, e.ActiveMedia().DrawMode);
    }

    [Fact]
    public void ActiveMedia_MissingNamedState_FallsBackToDirect()
    {
        var info = new ElementInfo();
        info.StateMedia[""] = (0x06000005, 1);
        var e = new UiDatElement(info, _ => (0, 0, 0)) { ActiveState = "NoSuchState" };
        Assert.Equal(0x06000005u, e.ActiveMedia().File);
    }

    // ── G1 tests: DefaultStateName + "Normal" implicit default ───────────────

    /// <summary>
    /// Task G1 change 5: when an element has no DefaultStateName but does have a "Normal"
    /// state sprite, the ctor should default ActiveState to "Normal" so the element
    /// renders its normal-state sprite without requiring explicit state assignment.
    /// </summary>
    [Fact]
    public void UiDatElement_DefaultsActiveStateToNormal_WhenNormalPresent()
    {
        var info = new ElementInfo();
        info.StateMedia["Normal"] = (0x0000AAAAu, 1);
        info.StateMedia["Hover"]  = (0x0000BBBBu, 1);

        var e = new UiDatElement(info, _ => (0, 0, 0));

        // Should have defaulted to "Normal" state.
        Assert.Equal(0x0000AAAAu, e.ActiveMedia().File);
    }

    /// <summary>
    /// Task G1 change 5: when DefaultStateName is set (e.g. "Minimized"),
    /// it takes priority over the "Normal" implicit default.
    /// </summary>
    [Fact]
    public void UiDatElement_DefaultsActiveStateToDefaultStateName_WhenSet()
    {
        var info = new ElementInfo { DefaultStateName = "Minimized" };
        info.StateMedia["Minimized"] = (0x0000BBBBu, 1);
        info.StateMedia["Maximized"] = (0x0000CCCCu, 1);
        info.StateMedia["Normal"]    = (0x0000DDDDu, 1);

        var e = new UiDatElement(info, _ => (0, 0, 0));

        // DefaultStateName "Minimized" wins over "Normal" implicit default.
        Assert.Equal(0x0000BBBBu, e.ActiveMedia().File);
    }

    /// <summary>
    /// Task G1 change 5: elements with only a DirectState sprite and no "Normal" state
    /// should still default to "" (DirectState) — no regression for chrome/grip elements.
    /// </summary>
    [Fact]
    public void UiDatElement_NoDefaultStateName_NoNormal_DefaultsToDirectState()
    {
        var info = new ElementInfo();
        info.StateMedia[""] = (0x06007777u, 1);  // DirectState only (e.g. vitals chrome corner)

        var e = new UiDatElement(info, _ => (0, 0, 0));

        // No DefaultStateName, no "Normal" state → ActiveState stays "" (DirectState).
        Assert.Equal(0x06007777u, e.ActiveMedia().File);
    }

    [Fact]
    public void NumericStateBridge_SetsNamedStateWithoutChangingGeometry()
    {
        var info = new ElementInfo { X = 4, Y = 5, Width = 30, Height = 40 };
        info.States[RetailUiStateIds.ShowDetail] = new UiStateInfo
        {
            Id = RetailUiStateIds.ShowDetail,
            Name = "ShowDetail",
            Image = new UiImageMedia(0x06000009u, 3),
        };
        info.StateMedia["ShowDetail"] = (0x06000009u, 3);
        var element = new UiDatElement(info, _ => (0u, 0, 0))
        {
            Left = info.X,
            Top = info.Y,
            Width = info.Width,
            Height = info.Height,
        };

        Assert.True(element.TrySetRetailState(RetailUiStateIds.ShowDetail));

        Assert.Equal(RetailUiStateIds.ShowDetail, element.ActiveRetailStateId);
        Assert.Equal((0x06000009u, 3), element.ActiveMedia());
        Assert.Equal((4f, 5f, 30f, 40f),
            (element.Left, element.Top, element.Width, element.Height));
    }

    [Fact]
    public void NumericStateBridge_MissingStatePreservesCurrentState()
    {
        var info = new ElementInfo { DefaultStateName = "Normal" };
        info.StateMedia["Normal"] = (0x06000001u, 1);
        var element = new UiDatElement(info, _ => (0u, 0, 0));

        Assert.False(element.TrySetRetailState(RetailUiStateIds.ShowDetail));
        Assert.Equal("Normal", element.ActiveState);
    }
}