#include <stdio.h>
#ifdef WINDOWS
    #include <direct.h>
    #define GetCurrentDir   _getcwd
    #define ClientName      "client.exe"
#else
    #include <unistd.h>
    #define GetCurrentDir   getcwd
    #define ClientName      "client"
#endif
#include <errno.h>
#include <QFileInfo>
#include <QProcess>
#include <QString>
#include "Logger.h"


int main()
{
	Logger::Info("Starting updater application\n");
	char currentPath[FILENAME_MAX];
	if (! GetCurrentDir(currentPath, sizeof(currentPath)))
    {
		return errno;
    }
    // check if whether client.bin.latest exists
	// it shoultd be renamed to client.exe (on Windows) ot just client (on Linux)
	QString cwd(currentPath);
	QFileInfo binInfo(cwd + "/client.bin.latest");
	if (! binInfo.exists())
	{
		Logger::Fatal("New client version not present.\n");
		Logger::Fatal("Terminating.\n");
		return -1;
	}

    // remove old client binary
    QFile client(cwd + "/" + ClientName);
    if (client.exists())
    {
        Logger::Trace("Removing old client executable\n");
        if (! client.remove())
        {
            Logger::Fatal("Can't remove %s\n", client.fileName().toStdString().c_str());
            return -1;
        }
    }
    else
    {
        Logger::Warn("Client executable is absent\n");
    }

    if (QFile::rename(cwd + "/client.bin.latest", cwd + "/" + ClientName))
    {
        Logger::Info("Client successfully updated\n");
    }
    else
    {
        Logger::Fatal("Can't rename 'client.bin.latest'\n");
        return -1;
    }

    // starting client process
    QString program(cwd + "/" + ClientName);
    if (! QProcess::startDetached(program))
    {
        Logger::Fatal("Failed to start client application\n");
        return -1;
    }

    return 0;
}