/****************************************************************************
**
** Copyright (C) 1993-2009 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include "SystemPrefix.h"

//==============================================================================
//	Includes
//==============================================================================
#include "Qt3DSTimer.h"

//==============================================================================
//	Namespace
//==============================================================================
namespace Q3DStudio {

//==============================================================================
/**
 *	Constructor
 */
CTimer::CTimer(ITimeProvider &inProvider)
    : m_TimeProvider(inProvider)
    , m_IsRunning(false)
{
    Start();
}

//==============================================================================
/**
 *	Start the timer
 */
void CTimer::Start()
{
    if (!m_IsRunning)
        m_StartTime = m_TimeProvider.GetCurrentTimeMicroSeconds();
    m_IsRunning = true;
}

//==============================================================================
/**
 *	Stop the timer
 */
void CTimer::Stop()
{
    if (m_IsRunning)
        m_StartTime = m_TimeProvider.GetCurrentTimeMicroSeconds() - m_StartTime;

    m_IsRunning = false;
}

//==============================================================================
/**
 *	Reset the timer
 */
void CTimer::Reset()
{
    if (m_IsRunning)
        m_StartTime = m_TimeProvider.GetCurrentTimeMicroSeconds();
    else
        m_StartTime = 0;
}

//==============================================================================
/**
 *  Gets the current time in milliseconds.
 *	@return the current time since timer was started(in miliseconds),
 *	or time when it was stopped
 */
TTimeUnit CTimer::GetTimeMilliSecs()
{
    return GetTimeMicroSecs() / 1000;
}

//=============================================================================
/**
 *	Get the number of usecs elapsed since start was called.
 *	If the timer is running then this will return the time from when start was
 *	called. If the timer is stopped then this will return the amount of time
 *	between the start and last stop.
 *	@return returns the elasped micro second.
 */
TMicroSeconds CTimer::GetTimeMicroSecs()
{
    if (m_IsRunning)
        return m_TimeProvider.GetCurrentTimeMicroSeconds() - m_StartTime;
    else
        return m_StartTime;
}

} // namespace Q3DStudio