using System.Collections.Immutable;
using AcDream.Core.Physics;
using DatReaderWriter.DBObjs;

namespace AcDream.Core.Tests.Physics;

public sealed class PhysicsDataCacheProductionTests
{
    [Fact]
    public void CreateProduction_SelectsFlatTraversal()
    {
        PhysicsDataCache cache = PhysicsDataCache.CreateProduction();

        Assert.Equal(
            CollisionTraversalMode.Flat,
            cache.CollisionTraversalMode);
    }

    [Fact]
    public void ProductionSetupPublication_RejectsMissingPreparedAsset()
    {
        PhysicsDataCache cache = PhysicsDataCache.CreateProduction();

        InvalidOperationException fault = Assert.Throws<InvalidOperationException>(
            () => cache.CacheSetup(0x0200_0001u, new Setup()));

        Assert.Contains(
            "no prepared collision asset",
            fault.Message,
            StringComparison.Ordinal);
    }

    [Fact]
    public void GraphOracleFixture_StillAcceptsSourceSetup()
    {
        var cache = new PhysicsDataCache();

        cache.CacheSetup(0x0200_0001u, new Setup());

        Assert.NotNull(cache.GetSetup(0x0200_0001u));
    }

    [Fact]
    public void ProductionSetupPublication_AllowsIdempotentCachedFlatAsset()
    {
        PhysicsDataCache cache = PhysicsDataCache.CreateProduction();
        var setup = new Setup();
        var prepared = new FlatSetupCollision(
            ImmutableArray<FlatCollisionCylinder>.Empty,
            ImmutableArray<FlatCollisionSphere>.Empty,
            0f,
            0f,
            0f,
            0f);

        cache.CacheSetup(0x0200_0001u, setup, prepared);
        cache.CacheSetup(0x0200_0001u, setup);

        Assert.Same(prepared, cache.GetFlatSetup(0x0200_0001u));
    }
}