// Copyright Epic Games, Inc. All Rights Reserved.

#include "Internationalization/PackageLocalizationUtil.h"
#include "Misc/PackageName.h"

bool FPackageLocalizationUtil::ConvertLocalizedToSource(const FString& InLocalized, FString& OutSource)
{
    if (FPackageName::IsLocalizedPackage(InLocalized))
    {
        const int32 L10NStart = InLocalized.Find(TEXT("L10N"), ESearchCase::IgnoreCase);
        if (L10NStart != INDEX_NONE)
        {
            // /Game/L10N/fr/Folder/MyAsset
            //       ^ We matched here, so we need to walk over the L10N folder, and then walk over the culture code to find the range of characters to remove
            int32 NumSlashesToFind = 2;
            int32 L10NEnd          = L10NStart;
            for (; L10NEnd < InLocalized.Len() && NumSlashesToFind > 0; ++L10NEnd)
            {
                if (InLocalized[L10NEnd] == TEXT('/'))
                {
                    --NumSlashesToFind;
                }
            }

            OutSource = InLocalized;
            OutSource.RemoveAt(L10NStart, L10NEnd - L10NStart, false);
            return true;
        }
    }

    return false;
}

bool FPackageLocalizationUtil::ConvertSourceToLocalized(const FString& InSource, const FString& InCulture, FString& OutLocalized)
{
    if (!FPackageName::IsLocalizedPackage(InSource))
    {
        if (InSource.Len() > 0 && InSource[0] == TEXT('/'))
        {
            const int32 RootPathEnd = InSource.Find(TEXT("/"), ESearchCase::IgnoreCase, ESearchDir::FromStart, 1);
            if (RootPathEnd != INDEX_NONE)
            {
                OutLocalized = InSource;
                OutLocalized.InsertAt(RootPathEnd, TEXT("/L10N") / InCulture);
                return true;
            }
        }
    }

    return false;
}

bool FPackageLocalizationUtil::GetLocalizedRoot(const FString& InPath, const FString& InCulture, FString& OutLocalized)
{
    if (InPath.Len() > 0 && InPath[0] == TEXT('/'))
    {
        const int32 RootPathEnd = InPath.Find(TEXT("/"), ESearchCase::IgnoreCase, ESearchDir::FromStart, 1);
        if (RootPathEnd != INDEX_NONE)
        {
            OutLocalized = InPath.Left(RootPathEnd);
            OutLocalized /= TEXT("L10N");
            if (InCulture.Len() > 0)
            {
                OutLocalized /= InCulture;
            }
            return true;
        }
    }

    return false;
}