PKHeX/PKHeX.Core/PKM/Util/Conversion/EntityConverterResultExtensions.cs

using System;
using static PKHeX.Core.EntityConverterResult;

namespace PKHeX.Core;

public static class EntityConverterResultExtensions
{
    public static bool IsSilent(this EntityConverterResult result) => result is None or Success;
    public static bool IsSuccess(this EntityConverterResult result) => result is Success or SuccessIncompatibleManual or SuccessIncompatibleReflection;

    public static string GetDisplayString(this EntityConverterResult result, PKM src, Type dest)
    {
        if (result == None)
            return "No need to convert, current format matches requested format.";

        var msg = result.IsSuccess() ? MessageStrings.MsgPKMConvertSuccess : MessageStrings.MsgPKMConvertFailFormat;
        var srcName = src.GetType().Name;
        var destName = dest.Name;
        var formatted = string.Format(msg, srcName, destName);
        if (result is Success)
            return formatted;

        var comment = GetMessage(result, src, dest);
        return string.Concat(formatted, Environment.NewLine, comment);
    }

    private static string GetMessage(this EntityConverterResult result, PKM src, Type dest) => result switch
    {
        SuccessIncompatibleReflection => "Converted via reflection.",
        SuccessIncompatibleManual => "Converted manually -- similar data.",
        IncompatibleForm  => MessageStrings.MsgPKMConvertFailForm,
        NoTransferRoute => MessageStrings.MsgPKMConvertFailNoMethod,
        IncompatibleSpecies => string.Format(MessageStrings.MsgPKMConvertFailFormat, SpeciesName.GetSpeciesName(src.Species, src.Language), dest.Name),
        IncompatibleLanguageGB => GetIncompatibleGBMessage(result, src, !src.Japanese),
        _ => throw new ArgumentOutOfRangeException(nameof(result)),
    };

    /// <summary>
    /// Returns an error string to indicate that a <see cref="GBPKM"/> is incompatible.
    /// </summary>
    public static string GetIncompatibleGBMessage(this EntityConverterResult result, PKM pk, bool destJapanese)
    {
        if (result is not IncompatibleLanguageGB)
            return string.Empty;
        var src = destJapanese ? MessageStrings.MsgPKMConvertInternational : MessageStrings.MsgPKMConvertJapanese;
        var dest = !destJapanese ? MessageStrings.MsgPKMConvertInternational : MessageStrings.MsgPKMConvertJapanese;
        return string.Format(MessageStrings.MsgPKMConvertIncompatible, src, pk.GetType().Name, dest);
    }
}