// Portage UE 5.5 - voir LPStringCompat.h

#include "LPStringCompat.h"

TArray<FString> ULPStringCompat::ParseIntoArray(const FString& SourceString, const FString& Delimiter, const bool CullEmptyStrings)
{
	// Transcription de FString::ParseIntoArray, UE 4.27 (String.cpp, lignes 940-963).
	TArray<FString> OutArray;
	const TCHAR* Start = *SourceString;
	const int32 DelimLength = Delimiter.Len();
	if (Start && *Start != TEXT('\0') && DelimLength)
	{
		while (const TCHAR* At = FCString::Strstr(Start, *Delimiter))
		{
			if (!CullEmptyStrings || At - Start)
			{
				OutArray.Emplace(UE_PTRDIFF_TO_INT32(At - Start), Start);
			}
			Start = At + DelimLength;
		}
		if (!CullEmptyStrings || *Start)
		{
			OutArray.Emplace(Start);
		}
	}
	return OutArray;
}

int32 ULPStringCompat::FindUE4(const FString& Str, const FString& SubStr, ESearchCase::Type SearchCase, ESearchDir::Type SearchDir, int32 StartPosition)
{
	// UE 4.27 : FCString::Stristr(Start, TEXT("")) ne trouve jamais rien (il cherche nul final).
	if (SubStr.IsEmpty() && SearchCase == ESearchCase::IgnoreCase && SearchDir == ESearchDir::FromStart)
	{
		return INDEX_NONE;
	}
	return Str.Find(SubStr, SearchCase, SearchDir, StartPosition);
}

int32 ULPStringCompat::FindSubstring(const FString& SearchIn, const FString& Substring, bool bUseCase, bool bSearchFromEnd, int32 StartPosition)
{
	// Meme corps que UKismetStringLibrary::FindSubstring, avec FindUE4.
	const ESearchCase::Type Case = bUseCase ? ESearchCase::CaseSensitive : ESearchCase::IgnoreCase;
	const ESearchDir::Type Dir = bSearchFromEnd ? ESearchDir::FromEnd : ESearchDir::FromStart;
	return FindUE4(SearchIn, Substring, Case, Dir, StartPosition);
}

bool ULPStringCompat::Contains(const FString& SearchIn, const FString& Substring, bool bUseCase, bool bSearchFromEnd)
{
	return FindSubstring(SearchIn, Substring, bUseCase, bSearchFromEnd) != -1;
}

bool ULPStringCompat::Split(const FString& SourceString, const FString& InStr, FString& LeftS, FString& RightS, ESearchCase::Type SearchCase, ESearchDir::Type SearchDir)
{
	// Meme corps que FString::Split (4.27 et 5.5), avec FindUE4.
	const int32 InPos = FindUE4(SourceString, InStr, SearchCase, SearchDir);
	if (InPos < 0)
	{
		return false;
	}
	LeftS = SourceString.Left(InPos);
	RightS = SourceString.Mid(InPos + InStr.Len());
	return true;
}