// Copyright 2025 Xenon Emulator Project. All rights reserved.

#include "StringUtil.h"

namespace Base {

#ifdef _WIN32
static std::wstring CPToUTF16(u32 code_page, std::string_view input) {
  const s32 size =
    ::MultiByteToWideChar(code_page, 0, input.data(), static_cast<s32>(input.size()), nullptr, 0);

  if (size == 0) {
    return {};
  }

  std::wstring output(size, L'\0');

  if (size != ::MultiByteToWideChar(code_page, 0, input.data(), static_cast<s32>(input.size()),
                  &output[0], static_cast<s32>(output.size()))) {
    output.clear();
  }

  return output;
}
#endif // ifdef _WIN32

std::string UTF16ToUTF8(const std::wstring_view &input) {
#ifdef _WIN32
  const s32 size = ::WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<s32>(input.size()),
                      nullptr, 0, nullptr, nullptr);
  if (size == 0) {
    return {};
  }

  std::string output(size, '\0');

  if (size != ::WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<s32>(input.size()),
                  &output[0], static_cast<s32>(output.size()), nullptr,
                  nullptr)) {
    output.clear();
  }
  return output;
#else
  // Very hacky way to get cross-platform wstring conversion
  return std::filesystem::path(input).string();
#endif // ifdef _WIN32
}

std::wstring UTF8ToUTF16W(const std::string_view &input) {
#ifdef _WIN32
  return CPToUTF16(CP_UTF8, input);
#else
  // Very hacky way to get cross-platform wstring conversion
  return std::filesystem::path(input).wstring();
#endif // ifdef _WIN32
}

std::string ToLower(const std::string &str) {
  std::string out = str;
  std::transform(str.begin(), str.end(), out.data(), ::tolower);
  return out;
}


} // namespace Base