Penumbra/Penumbra/Collections/Cache/GmpCache.cs

using OtterGui.Filesystem;
using Penumbra.Interop.Services;
using Penumbra.Interop.Structs;
using Penumbra.Meta;
using Penumbra.Meta.Files;
using Penumbra.Meta.Manipulations;

namespace Penumbra.Collections.Cache;

public struct GmpCache : IDisposable
{
    private          ExpandedGmpFile?      _gmpFile          = null;
    private readonly List<GmpManipulation> _gmpManipulations = new();

    public GmpCache()
    { }

    public void SetFiles(MetaFileManager manager)
        => manager.SetFile(_gmpFile, MetaIndex.Gmp);

    public MetaList.MetaReverter TemporarilySetFiles(MetaFileManager manager)
        => manager.TemporarilySetFile(_gmpFile, MetaIndex.Gmp);

    public void Reset()
    {
        if (_gmpFile == null)
            return;

        _gmpFile.Reset(_gmpManipulations.Select(m => m.SetId));
        _gmpManipulations.Clear();
    }

    public bool ApplyMod(MetaFileManager manager, GmpManipulation manip)
    {
        _gmpManipulations.AddOrReplace(manip);
        _gmpFile ??= new ExpandedGmpFile(manager);
        return manip.Apply(_gmpFile);
    }

    public bool RevertMod(MetaFileManager manager, GmpManipulation manip)
    {
        if (!_gmpManipulations.Remove(manip))
            return false;

        var def = ExpandedGmpFile.GetDefault(manager, manip.SetId);
        manip = new GmpManipulation(def, manip.SetId);
        return manip.Apply(_gmpFile!);
    }

    public void Dispose()
    {
        _gmpFile?.Dispose();
        _gmpFile = null;
        _gmpManipulations.Clear();
    }
}