#include "pidfile.h"
#include "p2daemonAppEngine.h"
#include <unistd.h>
#include <boost/lexical_cast.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/fstream.hpp>

SimpleMessageException(ChownFailed);

PidFile::PidFile(const boost::filesystem::path & path) :
	Path(path)
{
	auto pidDir = Path.parent_path();
	if (!boost::filesystem::exists(pidDir)) {
		boost::filesystem::create_directories(pidDir);
		if (DaemonAppEngine::setGroup || DaemonAppEngine::setUser) {
			if (chown(pidDir.string().c_str(),
						DaemonAppEngine::setUser ? *DaemonAppEngine::setUser : -1,
						DaemonAppEngine::setGroup ?  *DaemonAppEngine::setGroup : -1)) {
				boost::filesystem::remove(pidDir);
				throw ChownFailed(strerror(errno));
			}
		}
	}

	boost::filesystem::ofstream pf(Path);
	pf << getpid();
	if (DaemonAppEngine::setGroup || DaemonAppEngine::setUser) {
		if (chown(Path.string().c_str(),
				DaemonAppEngine::setUser ? *DaemonAppEngine::setUser : -1,
				DaemonAppEngine::setGroup ?  *DaemonAppEngine::setGroup : -1)) {
			boost::filesystem::remove(Path);
			throw ChownFailed(strerror(errno));
		}
	}
}

PidFile::~PidFile()
{
	boost::filesystem::remove(Path);
}