#include "utils.h"

#include <iomanip>
#include <numeric>

std::string formatCentAsEuroString(const int cent, int width)
{
    std::stringstream currStream;

    try {
        std::locale myLocale("de_DE.utf8");
        currStream.imbue(myLocale);
        currStream << std::right << std::setw(width) << std::showbase
                   << std::put_money(cent, false);
    } catch (std::runtime_error& err) {
        currStream << std::fixed << std::setw(width >= 4 ? width - 4 : width)
                   << std::setprecision(2) << cent / 100.0L << " €";
    }

    return currStream.str();
}

#ifdef _WIN32
// UTF-16 -> UTF-8 conversion
const std::string convert_to_utf8(const std::wstring& utf16_string)
{
    // get length
    int length =
        WideCharToMultiByte(CP_UTF8, 0, utf16_string.c_str(), static_cast<int>(utf16_string.size()),
                            nullptr, 0, nullptr, nullptr);
    if (!(length > 0))
        return std::string();
    else {
        string result;
        result.resize(static_cast<std::string::size_type>(length));

        if (WideCharToMultiByte(CP_UTF8, 0, utf16_string.c_str(),
                                static_cast<int>(utf16_string.size()), &result[0],
                                static_cast<int>(result.size()), nullptr, nullptr) == 0)
            throw error("Failure to execute convert_to_utf8: call to WideCharToMultiByte failed.");
        else
            return result;
    }
}
// UTF-8 -> UTF-16 conversion
const std::wstring convert_to_utf16(const std::string& utf8_string)
{
  // get length
  int length = MultiByteToWideChar(CP_UTF8, 0, utf8_string.c_str(), static_cast<int>(utf8_string.size()), nullptr, 0);
  if(!(length > 0))
    return std::wstring();
  else
  {
    wstring result;
    result.resize(static_cast<std::string::size_type>(length));

    if(MultiByteToWideChar(CP_UTF8, 0, utf8_string.c_str(), static_cast<int>(utf8_string.size()),
                           &result[0], static_cast<int>(result.size())) == 0 )
      throw error("Failure to execute convert_to_utf16: call to MultiByteToWideChar failed.");
    else
      return result;
  }
}
#endif