using System.Numerics;
using AcDream.Core.Lighting;
using DatReaderWriter.Types;
using Xunit;

namespace AcDream.Core.Tests.Lighting;

public sealed class LightingHookSinkTests
{
    [Fact]
    public void SetLightHook_FlipsOwnedLights()
    {
        var mgr = new LightManager();
        var sink = new LightingHookSink(mgr);

        var light1 = new LightSource { Kind = LightKind.Point, OwnerId = 42, IsLit = true };
        var light2 = new LightSource { Kind = LightKind.Point, OwnerId = 42, IsLit = true };
        var other  = new LightSource { Kind = LightKind.Point, OwnerId = 99, IsLit = true };
        sink.RegisterOwnedLight(light1);
        sink.RegisterOwnedLight(light2);
        sink.RegisterOwnedLight(other);

        var hook = new SetLightHook { LightsOn = false };
        sink.OnHook(entityId: 42, entityWorldPosition: Vector3.Zero, hook: hook);

        Assert.False(light1.IsLit);
        Assert.False(light2.IsLit);
        Assert.True(other.IsLit);  // owner 99 untouched
    }

    [Fact]
    public void UnregisterOwner_RemovesAllOwnedLights()
    {
        var mgr = new LightManager();
        var sink = new LightingHookSink(mgr);

        sink.RegisterOwnedLight(new LightSource { OwnerId = 7 });
        sink.RegisterOwnedLight(new LightSource { OwnerId = 7 });
        Assert.Equal(2, mgr.RegisteredCount);

        sink.UnregisterOwner(7);
        Assert.Equal(0, mgr.RegisteredCount);
    }

    [Fact]
    public void UnrelatedHook_Ignored()
    {
        var mgr = new LightManager();
        var sink = new LightingHookSink(mgr);
        var light = new LightSource { OwnerId = 1, IsLit = true };
        sink.RegisterOwnedLight(light);

        // Should not crash or change state for non-SetLight hooks.
        var noise = new SoundHook();
        sink.OnHook(entityId: 1, entityWorldPosition: Vector3.Zero, hook: noise);

        Assert.True(light.IsLit);
    }
}

public sealed class LightInfoLoaderTests
{
    [Fact]
    public void Load_EmptyLights_ReturnsEmpty()
    {
        var setup = new DatReaderWriter.DBObjs.Setup();
        var result = LightInfoLoader.Load(setup, 1u, Vector3.Zero, Quaternion.Identity);
        Assert.Empty(result);
    }

    [Fact]
    public void Load_PointLight_ProducesCorrectSource()
    {
        var setup = new DatReaderWriter.DBObjs.Setup();
        setup.Lights[0] = new LightInfo
        {
            ViewSpaceLocation = new Frame
            {
                Origin = new Vector3(1, 2, 3),
                Orientation = Quaternion.Identity,
            },
            Color = new ColorARGB { Red = 255, Green = 200, Blue = 50, Alpha = 255 },
            Intensity = 0.8f,
            Falloff = 8f,
            ConeAngle = 0f,  // point
        };

        var result = LightInfoLoader.Load(setup, ownerId: 77,
            entityPosition: new Vector3(100, 200, 300),
            entityRotation: Quaternion.Identity);

        Assert.Single(result);
        var light = result[0];
        Assert.Equal(LightKind.Point, light.Kind);
        Assert.Equal(77u, light.OwnerId);
        Assert.Equal(8f, light.Range);
        Assert.Equal(0.8f, light.Intensity);
        Assert.Equal(new Vector3(101, 202, 303), light.WorldPosition);
        Assert.InRange(light.ColorLinear.X, 0.99f, 1.01f);
    }

    [Fact]
    public void Load_NonZeroConeAngle_ProducesSpot()
    {
        var setup = new DatReaderWriter.DBObjs.Setup();
        setup.Lights[0] = new LightInfo
        {
            ViewSpaceLocation = new Frame { Origin = Vector3.Zero, Orientation = Quaternion.Identity },
            Color = new ColorARGB { Red = 255, Green = 255, Blue = 255, Alpha = 255 },
            Intensity = 1f,
            Falloff = 5f,
            ConeAngle = 0.5f,
        };

        var result = LightInfoLoader.Load(setup, ownerId: 1, entityPosition: Vector3.Zero, entityRotation: Quaternion.Identity);
        Assert.Equal(LightKind.Spot, result[0].Kind);
        Assert.Equal(0.5f, result[0].ConeAngle);
    }
}