#include "EnergySaver.h"

#include <QDebug>
#include <QProcess>
#include <iostream>

EnergySaver::EnergySaver(QObject *parent) : QObject(parent)
{

}

/**
 * @brief Create instance if necessary and set timeout interval.
 * @param interval Timer interval in seconds
 * @see EnergySaver::instance
 */
void EnergySaver::init(int interval)
{
    EnergySaver* saver = instance();
    saver->initTimer(interval*1000);
    saver->restartTimer();
}


/**
 * @brief Implements the singleton pattern.
 * @return Instance
 *
 * If no instance has been created yet, create new instance.
 */
EnergySaver *EnergySaver::instance()
{
    static EnergySaver* inst;
    if (inst == nullptr)
    {
        inst = new EnergySaver();
    }
    return inst;
}

void EnergySaver::restartTimer()
{
    if(mTimer.isActive()){
        mTimer.stop();
    }
    mTimer.start();
}

/**
 * @brief Initialize and connect timer.
 * @param interval Timeout interval in millisecond.
 */
void EnergySaver::initTimer(int interval)
{
    connect(&mTimer, &QTimer::timeout, this, &EnergySaver::onTimeout);
    mTimer.setInterval(interval);
    mTimer.setSingleShot(true);
}

/**
 * @brief Behavior on timeout: shut down RaspberryPi.
 * @todo Call shutdown script.
 */
void EnergySaver::onTimeout()
{
    std::cout << "Shutting down.";
#ifndef _DEBUG
    QProcess p;
    p.start("/usr/local/sbin/do_shutdown.sh");
    p.waitForFinished();
#endif
}