COM3D2.MeidoPhotoStudio/src/MeidoPhotoStudio.Plugin/Serialization/Serializers/ManagerSerializers/EnvironmentManagerSerializer.cs

using System;
using System.IO;

using UnityEngine;

namespace MeidoPhotoStudio.Plugin;

public class EnvironmentManagerSerializer : Serializer<EnvironmentManager>
{
    private const short Version = 1;

    private static SimpleSerializer<TransformDTO> TransformDtoSerializer =>
        Serialization.GetSimple<TransformDTO>();

    public override void Serialize(EnvironmentManager manager, BinaryWriter writer)
    {
        writer.Write(EnvironmentManager.Header);
        writer.WriteVersion(Version);

        writer.Write(manager.CurrentBgAsset);

        var bgTransform = GetBgTransform(manager);
        var transformDto = bgTransform ? new TransformDTO(bgTransform) : new TransformDTO();

        TransformDtoSerializer.Serialize(transformDto, writer);
    }

    public override void Deserialize(EnvironmentManager manager, BinaryReader reader, SceneMetadata metadata)
    {
        _ = reader.ReadVersion();

        var bgAsset = reader.ReadString();
        var transformDto = TransformDtoSerializer.Deserialize(reader, metadata);
        var creativeBg = Utility.IsGuidString(bgAsset);

        var bgList = creativeBg
            ? Constants.MyRoomCustomBGList.ConvertAll(kvp => kvp.Key)
            : Constants.BGList;

        var assetIndex =
            bgList.FindIndex(asset => asset.Equals(bgAsset, StringComparison.InvariantCultureIgnoreCase));

        var validBg = assetIndex >= 0;

        if (validBg)
        {
            bgAsset = bgList[assetIndex];
        }
        else
        {
            Utility.LogWarning($"Could not load BG '{bgAsset}'");
            creativeBg = false;
            bgAsset = EnvironmentManager.DefaultBg;
        }

        manager.ChangeBackground(bgAsset, creativeBg);

        if (!validBg)
            return;

        var bg = GetBgTransform(manager);

        if (!bg)
            return;

        // TODO: Use transform.SetPositionAndRotation
        bg.position = transformDto.Position;
        bg.rotation = transformDto.Rotation;
        bg.localScale = transformDto.LocalScale;
    }

    private static Transform GetBgTransform(EnvironmentManager manager) =>
        Utility.GetFieldValue<EnvironmentManager, Transform>(manager, "bg");
}