Penumbra/Penumbra/Import/TexToolsMeta.Rgsp.cs

using System;
using System.IO;
using Dalamud.Logging;
using Penumbra.GameData.Enums;
using Penumbra.Meta.Files;
using Penumbra.Meta.Manipulations;

namespace Penumbra.Import;

public partial class TexToolsMeta
{
    // Parse a single rgsp file.
    public static TexToolsMeta FromRgspFile( string filePath, byte[] data )
    {
        if( data.Length != 45 && data.Length != 42 )
        {
            PluginLog.Error( "Error while parsing .rgsp file:\n\tInvalid number of bytes." );
            return Invalid;
        }

        using var s  = new MemoryStream( data );
        using var br = new BinaryReader( s );
        // The first value is a flag that signifies version.
        // If it is byte.max, the following two bytes are the version,
        // otherwise it is version 1 and signifies the sub race instead.
        var flag    = br.ReadByte();
        var version = flag != 255 ? ( uint )1 : br.ReadUInt16();

        var ret = new TexToolsMeta( filePath, version );

        // SubRace is offset by one due to Unknown.
        var subRace = ( SubRace )( version == 1 ? flag + 1 : br.ReadByte() + 1 );
        if( !Enum.IsDefined( typeof( SubRace ), subRace ) || subRace == SubRace.Unknown )
        {
            PluginLog.Error( $"Error while parsing .rgsp file:\n\t{subRace} is not a valid SubRace." );
            return Invalid;
        }

        // Next byte is Gender. 1 is Female, 0 is Male.
        var gender = br.ReadByte();
        if( gender != 1 && gender != 0 )
        {
            PluginLog.Error( $"Error while parsing .rgsp file:\n\t{gender} is neither Male nor Female." );
            return Invalid;
        }

        // Add the given values to the manipulations if they are not default.
        void Add( RspAttribute attribute, float value )
        {
            var def = CmpFile.GetDefault( subRace, attribute );
            if( value != def )
            {
                ret.MetaManipulations.Add( new RspManipulation( subRace, attribute, value ) );
            }
        }

        if( gender == 1 )
        {
            Add( RspAttribute.FemaleMinSize, br.ReadSingle() );
            Add( RspAttribute.FemaleMaxSize, br.ReadSingle() );
            Add( RspAttribute.FemaleMinTail, br.ReadSingle() );
            Add( RspAttribute.FemaleMaxTail, br.ReadSingle() );

            Add( RspAttribute.BustMinX, br.ReadSingle() );
            Add( RspAttribute.BustMinY, br.ReadSingle() );
            Add( RspAttribute.BustMinZ, br.ReadSingle() );
            Add( RspAttribute.BustMaxX, br.ReadSingle() );
            Add( RspAttribute.BustMaxY, br.ReadSingle() );
            Add( RspAttribute.BustMaxZ, br.ReadSingle() );
        }
        else
        {
            Add( RspAttribute.MaleMinSize, br.ReadSingle() );
            Add( RspAttribute.MaleMaxSize, br.ReadSingle() );
            Add( RspAttribute.MaleMinTail, br.ReadSingle() );
            Add( RspAttribute.MaleMaxTail, br.ReadSingle() );
        }

        return ret;
    }
}