using AcDream.App.Physics;

namespace AcDream.App.Tests.Physics;

public sealed class LiveEntityNetworkBranchRoutingTests
{
    [Fact]
    public void Vector_ProjectileStopsCanonicalAndOrdinaryRoutes()
    {
        var calls = new List<string>();

        LiveEntityVectorRoute route = LiveEntityVectorRouter.Route(
            () => { calls.Add("projectile"); return true; },
            () => { calls.Add("canonical"); return true; },
            () => calls.Add("ordinary"));

        Assert.Equal(LiveEntityVectorRoute.Projectile, route);
        Assert.Equal(["projectile"], calls);
    }

    [Fact]
    public void Vector_CanonicalBodyRunsOnlyAfterProjectileDeclines()
    {
        var calls = new List<string>();

        LiveEntityVectorRoute route = LiveEntityVectorRouter.Route(
            () => { calls.Add("projectile"); return false; },
            () => { calls.Add("canonical"); return true; },
            () => calls.Add("ordinary"));

        Assert.Equal(LiveEntityVectorRoute.CanonicalBody, route);
        Assert.Equal(["projectile", "canonical"], calls);
    }

    [Fact]
    public void Vector_OrdinaryRemoteIsTheLastFallback()
    {
        var calls = new List<string>();

        LiveEntityVectorRoute route = LiveEntityVectorRouter.Route(
            () => { calls.Add("projectile"); return false; },
            () => { calls.Add("canonical"); return false; },
            () => calls.Add("ordinary"));

        Assert.Equal(LiveEntityVectorRoute.OrdinaryRemote, route);
        Assert.Equal(["projectile", "canonical", "ordinary"], calls);
    }

    [Fact]
    public void ForcePosition_BlipsAndAcknowledgesExactlyOnce()
    {
        int currentChecks = 0;
        int blips = 0;
        int acknowledgements = 0;

        bool completed = LocalForcePositionTransaction.Apply(
            isForcePosition: true,
            () => { currentChecks++; return true; },
            () => blips++,
            () => acknowledgements++);

        Assert.True(completed);
        Assert.Equal(2, currentChecks);
        Assert.Equal(1, blips);
        Assert.Equal(1, acknowledgements);
    }

    [Fact]
    public void ForcePosition_AcknowledgementInvalidationStopsTheTail()
    {
        bool current = true;
        int acknowledgements = 0;

        bool completed = LocalForcePositionTransaction.Apply(
            isForcePosition: true,
            () => current,
            () => { },
            () => { acknowledgements++; current = false; });

        Assert.False(completed);
        Assert.Equal(1, acknowledgements);
    }

    [Fact]
    public void OrdinaryPositionDoesNotBlipOrAcknowledge()
    {
        int calls = 0;

        Assert.True(LocalForcePositionTransaction.Apply(
            isForcePosition: false,
            () => { calls++; return false; },
            () => calls++,
            () => calls++));
        Assert.Equal(0, calls);
    }
}