using AcDream.App.UI;

namespace AcDream.App.Tests.UI;

public sealed class InteractionStateTests
{
    [Fact]
    public void Modes_HaveOneOwnerAndOneDeduplicatedTransitionStream()
    {
        var state = new InteractionState();
        var changes = new List<InteractionModeTransition>();
        state.Changed += changes.Add;

        Assert.True(state.EnterUse());
        Assert.False(state.EnterUse());
        Assert.True(state.EnterExamine());
        Assert.True(state.EnterUseItemOnTarget(0x100u));
        Assert.True(state.Clear());

        Assert.Equal(4, changes.Count);
        Assert.Equal(InteractionModeKind.None, state.Current.Kind);
        Assert.Equal(0x100u, changes[2].Current.SourceObjectId);
    }

    [Fact]
    public void UseItemOnTarget_RejectsMissingSource()
    {
        var state = new InteractionState();
        Assert.Throws<ArgumentOutOfRangeException>(() => state.EnterUseItemOnTarget(0));
        Assert.Equal(InteractionMode.None, state.Current);
    }
}