PKHeX/PKHeX.Core/Game/Enums/GCVersion.cs

namespace PKHeX.Core
{
    /// <summary>
    /// <see cref="GameVersion"/> analogues used by Colosseum/XD instead of the main-series values.
    /// </summary>
    public enum GCVersion : byte
    {
        None = 0,
        FR = 1,
        LG = 2,
        S = 8,
        R = 9,
        E = 10,
        CXD = 11,
    }

    public static class GCVersionExtensions
    {
        /// <summary>
        /// Translates a main-series <see cref="GameVersion"/> to the corresponding <see cref="GCVersion"/> value.
        /// </summary>
        /// <param name="gbaVersion">Version ID while present in the main-series games</param>
        /// <returns>Version ID while present in the GameCube games</returns>
        public static GCVersion GetCXDVersionID(this GameVersion gbaVersion)
        {
            return gbaVersion switch
            {
                GameVersion.S => GCVersion.S,
                GameVersion.R => GCVersion.R,
                GameVersion.E => GCVersion.E,
                GameVersion.FR => GCVersion.FR,
                GameVersion.LG => GCVersion.LG,
                GameVersion.CXD => GCVersion.CXD,
                _ => GCVersion.None,
            };
        }

        /// <summary>
        /// Translates a <see cref="GCVersion"/> to the corresponding main-series <see cref="GameVersion"/> value.
        /// </summary>
        /// <param name="gcVersion">Version ID while present in the GameCube games</param>
        /// <returns>Version ID while present in the main-series games</returns>
        public static GameVersion GetG3VersionID(this GCVersion gcVersion)
        {
            return gcVersion switch
            {
                GCVersion.S => GameVersion.S,
                GCVersion.R => GameVersion.R,
                GCVersion.E => GameVersion.E,
                GCVersion.FR => GameVersion.FR,
                GCVersion.LG => GameVersion.LG,
                GCVersion.CXD => GameVersion.CXD,
                _ => GameVersion.Unknown
            };
        }
    }
}