#include "system_error.h"

#include <Windows.h>

namespace am {
std::string system_error::error2str(unsigned long error)
{
    DWORD system_locale = MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL);

    HLOCAL local_buf = nullptr;

    BOOL ret = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS
                                  | FORMAT_MESSAGE_ALLOCATE_BUFFER,
                              NULL,
                              error,
                              system_locale,
                              (PSTR) &local_buf,
                              0,
                              NULL);

    if (!ret) {
        HMODULE hnetmsg = LoadLibraryExA("netmsg.dll", NULL, DONT_RESOLVE_DLL_REFERENCES);
        if (hnetmsg != nullptr) {
            ret = FormatMessageA(FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_IGNORE_INSERTS
                                     | FORMAT_MESSAGE_ALLOCATE_BUFFER,
                                 hnetmsg,
                                 error,
                                 system_locale,
                                 (PSTR) &local_buf,
                                 0,
                                 NULL);

            FreeLibrary(hnetmsg);
        }
    }

    std::string error_str;

    if (ret) {
        error_str = (char*) LocalLock(local_buf);
        LocalFree(local_buf);
    }

    return error_str;
}
} // namespace am