using AcDream.App.Streaming;

namespace AcDream.App.Tests.Streaming;

public sealed class WorldRevealReadinessBarrierTests
{
    private sealed class State
    {
        public bool RenderReady;
        public bool SpawnCellReady;
        public bool TerrainReady;
        public bool CompositeReady;
        public bool Unhydratable;
        public int Invalidations;
        public int Preparations;
        public uint PreparedCell;
        public int PreparedRadius = -1;
        public int RenderRadius = -1;
        public int TerrainRadius = -1;

        public WorldRevealReadinessBarrier Build() => new(
            isRenderNeighborhoodReady: (cell, radius) =>
            {
                RenderRadius = radius;
                return RenderReady;
            },
            isSpawnCellReady: _ => SpawnCellReady,
            isTerrainNeighborhoodReady: (cell, radius) =>
            {
                TerrainRadius = radius;
                return TerrainReady;
            },
            areCompositeTexturesReady: () => CompositeReady,
            prepareCompositeTextures: (cell, radius) =>
            {
                Preparations++;
                PreparedCell = cell;
                PreparedRadius = radius;
            },
            invalidateCompositeTextures: () => Invalidations++,
            isSpawnClaimUnhydratable: _ => Unhydratable);
    }

    [Fact]
    public void Begin_InvalidatesPriorDestinationTextureReadiness()
    {
        var state = new State();
        var barrier = state.Build();

        barrier.Begin();

        Assert.Equal(1, state.Invalidations);
    }

    [Fact]
    public void OutdoorReveal_JoinsNearRenderTexturesAndTerrain()
    {
        const uint outdoorCell = 0x11340021u;
        var state = new State();
        var barrier = state.Build();

        Assert.False(barrier.IsReady(outdoorCell));
        Assert.Equal(WorldRevealReadinessBarrier.OutdoorNeighborhoodRadius, state.RenderRadius);

        state.RenderReady = true;
        barrier.Prepare(outdoorCell);
        Assert.Equal(1, state.Preparations);
        Assert.Equal(outdoorCell, state.PreparedCell);
        Assert.Equal(WorldRevealReadinessBarrier.OutdoorNeighborhoodRadius, state.PreparedRadius);

        state.CompositeReady = true;
        Assert.False(barrier.IsReady(outdoorCell));

        state.TerrainReady = true;
        Assert.True(barrier.IsReady(outdoorCell));
        Assert.Equal(WorldRevealReadinessBarrier.OutdoorNeighborhoodRadius, state.TerrainRadius);
    }

    [Fact]
    public void IndoorReveal_UsesCenterRenderAndExactEnvCellPhysics()
    {
        const uint indoorCell = 0x11340100u;
        var state = new State
        {
            RenderReady = true,
            CompositeReady = true,
            TerrainReady = true,
        };
        var barrier = state.Build();

        barrier.Prepare(indoorCell);
        Assert.Equal(0, state.PreparedRadius);
        Assert.False(barrier.IsReady(indoorCell));
        Assert.Equal(-1, state.TerrainRadius);

        state.SpawnCellReady = true;
        Assert.True(barrier.IsReady(indoorCell));
        Assert.Equal(0, state.RenderRadius);
    }

    [Fact]
    public void Prepare_WaitsForStaticMeshPublication()
    {
        var state = new State();
        var barrier = state.Build();

        barrier.Prepare(0x11340021u);

        Assert.Equal(0, state.Preparations);
    }

    [Fact]
    public void ImpossibleClaim_CrossesExistingLoudRecoveryPath()
    {
        var state = new State { Unhydratable = true };
        var barrier = state.Build();

        barrier.Prepare(0x113401FFu);

        Assert.True(barrier.IsReady(0x113401FFu));
        Assert.Equal(0, state.Preparations);
        Assert.Equal(-1, state.RenderRadius);
    }
}