//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/Model/Type/UpdateTimer.cpp
//! @brief     Implements class UpdateTimer.
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************

#include "GUI/Model/Type/UpdateTimer.h"

UpdateTimer::UpdateTimer(int timerInterval, QObject* parent)
    : QObject(parent)
    , m_update_request_count(0)
    , m_timer_interval(timerInterval)
    , m_is_busy(false)
    , m_timer(new QTimer(this))
{
    m_timer->setInterval(m_timer_interval);
    m_timer->setSingleShot(true);
    connect(m_timer, &QTimer::timeout, this, &UpdateTimer::onTimerTimeout);
}

void UpdateTimer::reset()
{
    m_update_request_count = 0;
    m_timer->stop();
    m_is_busy = false;
}

void UpdateTimer::setTimerInterval(int timer_interval_msec)
{
    m_timer_interval = timer_interval_msec;
}

void UpdateTimer::scheduleUpdate()
{
    if (m_is_busy)
        return;

    ++m_update_request_count;

    if (!m_timer->isActive())
        m_timer->start(m_timer_interval);
}

void UpdateTimer::onTimerTimeout()
{
    m_is_busy = true;

    if (m_update_request_count > 0) {
        m_update_request_count = 0;
        emit timeToUpdate();
    }

    m_is_busy = false;
}
