//    This file is part of JustMotion.

//    JustMotion is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.

//    JustMotion is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.

#include "common.h"
#include "camera.h"
#include "proc_control.h"

void showHelp(const QString etcDir)
{
    QTextStream(stdout) << APP_NAME << " " << APP_VERSION << Qt::endl << Qt::endl;
    QTextStream(stdout) << "Usage: " << APP_TARGET << " <argument>" << Qt::endl << Qt::endl;
    QTextStream(stdout) << "-h : display usage information about this application." << Qt::endl;
    QTextStream(stdout) << "-d : all valid config files found in " << etcDir << " will be used to" << Qt::endl;
    QTextStream(stdout) << "     create camera instances. (this is blocking, meant to run with systemd)" << Qt::endl;
    QTextStream(stdout) << "-v : display the current version." << Qt::endl;
    QTextStream(stdout) << "-u : uninstall the entire app from your system, including the service." << Qt::endl;
    QTextStream(stdout) << "-f : force an action without pausing for user confirmation." << Qt::endl;
    QTextStream(stdout) << "-s : view the status of all camera instances." << Qt::endl;
    QTextStream(stdout) << "-q : kill all camera instances." << Qt::endl;
    QTextStream(stdout) << "-r : same as -d except it is non-blocking by starting all camera instances" << Qt::endl;
    QTextStream(stdout) << "     via systemd. same as 'systemctl start " << APP_TARGET << "'" << Qt::endl;
 }

int main(int argc, char** argv)
{   
    QCoreApplication app(argc, argv);

    QCoreApplication::setApplicationName(APP_NAME);
    QCoreApplication::setApplicationVersion(APP_VERSION);

    auto args     = QCoreApplication::arguments();
    auto etcDir   = "/etc/" + QString(APP_TARGET);
    auto staDir   = QDir::tempPath() + "/" + APP_TARGET + "-stats";
    auto procFile = QDir::tempPath() + "/" + APP_TARGET + "-proc";
    auto ret      = 0;

    if (!QFileInfo::exists(staDir))
    {
        mkPath(staDir);
    }

    if (args.contains("-h"))
    {
        showHelp(etcDir);
    }
    else if (args.contains("-v"))
    {
        QTextStream(stdout) << APP_VERSION << Qt::endl;
    }
    else if (args.contains("-d"))
    {
        auto confs = lsFilesInDir(etcDir);
        auto proc  = new ProcControl(procFile, staDir, &app);

        if (!proc->init())
        {
            ret = EACCES;
        }
        else
        {
            for (auto &&conf : confs)
            {
                new Camera(etcDir + "/" + conf, staDir, proc, &app);
            }

            ret = app.exec();
        }
    }
    else if (args.contains("-u"))
    {
        if (args.contains("-f"))
        {
            ret = QProcess::execute("/opt/" + QString(APP_TARGET) + "/uninstall.sh", QStringList());
        }
        else
        {
            char ans;

            std::cout << "This will completely uninstall " << APP_NAME << " from your system. continue y/n? ";
            std::cin >> ans;

            if (ans == 'y' || ans == 'Y')
            {
                ret = QProcess::execute("/opt/" + QString(APP_TARGET) + "/uninstall.sh", QStringList());
            }
        }
    }
    else if (args.contains("-s"))
    {
        auto statFiles = lsFilesInDir(staDir);

        for (auto &&statFile: statFiles)
        {
            QFile file(staDir + "/" + statFile);

            file.open(QFile::ReadOnly);

            std::cout << file.readAll().data();

            file.close();
        }
    }
    else if (args.contains("-q"))
    {
        QFile::remove(procFile);
        QThread::currentThread()->sleep(5);
    }
    else if (args.contains("-r"))
    {
        QProcess::execute("systemctl start " + QString(APP_TARGET));
    }
    else
    {
        showHelp(etcDir);
    }

    return ret;
}