//
//
//

#include <windows.h>
#include <string>
#include <cassert>

#include "SingleApplication.h"

HANDLE SingleApplication::_uniq = NULL;
std::string SingleApplication::_appid;

SingleApplication::SingleApplication(const char* appid)
{
	assert(appid != NULL);
	_appid = appid;
}

SingleApplication::~SingleApplication()
{
	if (_uniq) CloseHandle(_uniq);
}

bool SingleApplication::IsFirstInstance()
{
	if (_uniq) return true;
	else {
		_uniq = CreateMutex(NULL, TRUE, _appid.c_str());
		if (!_uniq) throw InitFailed();
		else {
			if (GetLastError() == ERROR_ALREADY_EXISTS) {
				InitSecondInstanceSafely();
				ReleaseMutex(_uniq);
				CloseHandle(_uniq);
				_uniq = NULL;
				return false;
			} else {
				InitFirstInstanceSafely();
				ReleaseMutex(_uniq);
				return true;
			}
		}
	}
}