#include "string_util.hpp"

#include "system_headers.hpp"
#include "exception.hpp"

namespace cru::util {
MultiByteString ToUtf8String(const StringView& string) {
  if (string.empty()) return MultiByteString();

  const auto length = ::WideCharToMultiByte(CP_UTF8, 0, string.data(), -1,
                                            nullptr, 0, nullptr, nullptr);
  MultiByteString result;
  result.reserve(length);
  if (::WideCharToMultiByte(CP_UTF8, 0, string.data(), -1, result.data(),
                            static_cast<int>(result.capacity()), nullptr,
                            nullptr) == 0)
    throw Win32Error(::GetLastError(),
                     "Failed to convert wide string to UTF-8.");
  return result;
}
}