///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 F4HKW                                                      //
// for F4EXB / SDRAngel                                                          //
//                                                                               //
// OpenGL interface modernization.                                               //
//                                                                               //
// This program 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 as version 3 of the License, or                  //
//                                                                               //
// This program 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#include <QPainter>
#include <QMouseEvent>
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QSurface>
#include "atvscreen.h"

#include <algorithm>
#include <QDebug>

ATVScreen::ATVScreen(QWidget* parent) :
    QGLWidget(parent),
    m_objMutex(QMutex::NonRecursive)
{
	setAttribute(Qt::WA_OpaquePaintEvent);
    //connect(&m_objTimer, SIGNAL(timeout()), this, SLOT(tick()));
    //m_objTimer.start(50);

    m_chrLastData=NULL;
    m_blnDataChanged=false;
    m_blnGLContextInitialized=false;

    m_intAskedCols=0;
    m_intAskedRows=0;

}

ATVScreen::~ATVScreen()
{    
	cleanup();
}

QRgb* ATVScreen::getRowBuffer(int intRow)
{
    if(m_blnGLContextInitialized==false)
    {
        return NULL;
    }

    return m_objGLShaderArray.GetRowBuffer(intRow);
}

void ATVScreen::renderImage(unsigned char * objData)
{   
    m_chrLastData=objData;
    update();
}

void ATVScreen::resetImage()
{   
    m_objGLShaderArray.ResetPixels();
}

void ATVScreen::resizeATVScreen(int intCols, int intRows)
{
    m_intAskedCols=intCols;
    m_intAskedRows=intRows;
}

void ATVScreen::initializeGL()
{
    m_objMutex.lock();

    QOpenGLContext *objGlCurrentContext =  QOpenGLContext::currentContext();

    if (objGlCurrentContext)
    {
        if (QOpenGLContext::currentContext()->isValid())
        {
			qDebug() << "ATVScreen::initializeGL: context:"
				<< " major: " << (QOpenGLContext::currentContext()->format()).majorVersion()
				<< " minor: " << (QOpenGLContext::currentContext()->format()).minorVersion()
				<< " ES: " << (QOpenGLContext::currentContext()->isOpenGLES() ? "yes" : "no");
		}
        else
        {
			qDebug() << "ATVScreen::initializeGL: current context is invalid";
		}
    }
    else
    {
		qCritical() << "ATVScreen::initializeGL: no current context";
		return;
	}

    QSurface *objSurface = objGlCurrentContext->surface();

    if (objSurface == NULL)
	{
		qCritical() << "ATVScreen::initializeGL: no surface attached";
		return;
	}
	else
	{
        if (objSurface->surfaceType() != QSurface::OpenGLSurface)
		{
            qCritical() << "ATVScreen::initializeGL: surface is not an OpenGLSurface: " << objSurface->surfaceType() << " cannot use an OpenGL context";
			return;
		}
		else
		{
            qDebug() << "ATVScreen::initializeGL: OpenGL surface:" << " class: " << (objSurface->surfaceClass() == QSurface::Window ? "Window" : "Offscreen");
		}
	}

    connect(objGlCurrentContext, &QOpenGLContext::aboutToBeDestroyed, this, &ATVScreen::cleanup); // TODO: when migrating to QOpenGLWidget

    //Par défaut
    m_intAskedCols = ATV_COLS;
    m_intAskedRows = ATV_ROWS;

    m_blnGLContextInitialized=true;

    m_objMutex.unlock();  
}

void ATVScreen::resizeGL(int intWidth, int intHeight)
{   
    QOpenGLFunctions *ptrF = QOpenGLContext::currentContext()->functions();
    ptrF->glViewport(0, 0, intWidth, intHeight);
    m_blnConfigChanged = true;
}

void ATVScreen::paintGL()
{    
    m_objMutex.lock();

    if(m_blnGLContextInitialized)
    {
        if((m_intAskedCols!=0) && (m_intAskedRows!=0))
        {            
            m_objGLShaderArray.InitializeGL(m_intAskedCols, m_intAskedRows);
            m_intAskedCols=0;
            m_intAskedRows=0;
        }

        m_objGLShaderArray.RenderPixels(m_chrLastData);
    }

    m_objMutex.unlock();
}

void ATVScreen::mousePressEvent(QMouseEvent* event)
{
}


void ATVScreen::tick()
{    
}


void ATVScreen::connectTimer(const QTimer& objTimer)
{
    /*
	qDebug() << "ATVScreen::connectTimer";
    disconnect(&m_objTimer, SIGNAL(timeout()), this, SLOT(tick()));
    connect(&objTimer, SIGNAL(timeout()), this, SLOT(tick()));
    m_objTimer.stop();
    */
}

void ATVScreen::cleanup()
{	    
    if(m_blnGLContextInitialized)
    {
        m_objGLShaderArray.Cleanup();
    }
}


bool ATVScreen::selectRow(int intLine)
{
    if(m_blnGLContextInitialized)
    {
        return m_objGLShaderArray.SelectRow(intLine);
    }
}

bool ATVScreen::setDataColor(int intCol,int intRed, int intGreen, int intBlue)
{
    if(m_blnGLContextInitialized)
    {
        return m_objGLShaderArray.SetDataColor(intCol, qRgb(intRed, intGreen, intBlue));
    }
}