using System.Numerics;
using AcDream.App.Rendering;
using AcDream.Core.Physics;
using AcDream.Core.World;
using DatReaderWriter.DBObjs;

namespace AcDream.App.Tests.Rendering;

public sealed class LiveAppearanceAnimationTests
{
    [Fact]
    public void RebindAppearance_PreservesEntitySequencerAndPlaybackState()
    {
        var setup = new Setup();
        var animation = new Animation();
        var sequencer = new AnimationSequencer(setup, new MotionTable(), new NullLoader());
        var oldEntity = Entity(0x70000001u, 0x01000001u);
        var state = new GameWindow.AnimatedEntity
        {
            Entity = oldEntity,
            Setup = setup,
            Animation = animation,
            LowFrame = 2,
            HighFrame = 9,
            Framerate = 30f,
            Scale = 1f,
            PartTemplate = [new GameWindow.AnimatedPartTemplate(0x01000001u, null, true)],
            PartAvailability = [true],
            CurrFrame = 6.5f,
            Sequencer = sequencer,
        };
        IReadOnlyList<MeshRef> dressedParts =
        [
            new MeshRef(0x01000002u, Matrix4x4.Identity),
            new MeshRef(0x01000003u, Matrix4x4.CreateTranslation(1f, 2f, 3f)),
        ];

        oldEntity.ApplyAppearance(dressedParts, paletteOverride: null, partOverrides: []);
        GameWindow.RebindAnimatedEntityForAppearance(
            state,
            oldEntity,
            setup,
            1.25f,
            [
                new GameWindow.AnimatedPartTemplate(0x01000002u, null, true),
                new GameWindow.AnimatedPartTemplate(0x01000003u, null, true),
            ],
            [true, true]);

        Assert.Same(oldEntity, state.Entity);
        Assert.Same(dressedParts, state.Entity.MeshRefs);
        Assert.Same(sequencer, state.Sequencer);
        Assert.Equal(6.5f, state.CurrFrame);
        Assert.Equal((2, 9, 30f), (state.LowFrame, state.HighFrame, state.Framerate));
        Assert.Equal(1.25f, state.Scale);
        Assert.Equal(new[] { 0x01000002u, 0x01000003u },
            state.PartTemplate.Select(part => part.GfxObjId));
    }

    private static WorldEntity Entity(uint id, uint gfxObjId) => new()
    {
        Id = id,
        ServerGuid = 0x50000001u,
        SourceGfxObjOrSetupId = 0x02000001u,
        Position = Vector3.Zero,
        Rotation = Quaternion.Identity,
        MeshRefs = [new MeshRef(gfxObjId, Matrix4x4.Identity)],
    };

    private sealed class NullLoader : IAnimationLoader
    {
        public Animation? LoadAnimation(uint id) => null;
    }
}