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#include "SMVideoZoomWidget.h"

#include "cvtools.h"

#include <QScrollBar>

#include <QMenu>

SMVideoZoomWidget::SMVideoZoomWidget(QWidget *parent) : QGraphicsView(parent)

{

    scene = new QGraphicsScene(this);

    item = new QGraphicsPixmapItem;

    scene->addItem(item);

    setScene(scene);

    // Causes weird scroll bars

    //this->setStyleSheet("background: transparent");

    setContextMenuPolicy(Qt::CustomContextMenu);

    connect(this, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(showContextMenu(const QPoint&)));

}

static QImage cvMat2qImage(cv::Mat mat){

    // 8-bits unsigned, raw bayer image

    if(mat.type()==CV_8UC1) {

        cv::Mat rgb;

        cv::cvtColor(mat, rgb, CV_BayerBG2RGB);

        QImage img((const uchar*)rgb.data, rgb.cols, rgb.rows, rgb.step, QImage::Format_RGB888);

        img = img.copy();

        return img;

    // 8-bit unsigned rgb image

    } else if(mat.type()==CV_8UC3) {

        // Copy input Mat

        QImage img((const uchar*)mat.data, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);

        return img;

    // 16-bit unsigned, raw bayer image

    } else if(mat.type()==CV_16UC1) {

        cv::Mat mat8bit = mat.clone();

        cvtools::rshift(mat8bit, 8);

        mat8bit.convertTo(mat8bit, CV_8UC1);

        cv::Mat rgb;

        cv::cvtColor(mat8bit, rgb, CV_BayerBG2RGB);

        QImage img((const uchar*)rgb.data, rgb.cols, rgb.rows, rgb.step, QImage::Format_RGB888);

        img = img.copy();

        return img;

    // 16-bit unsigned rgb image

    } else if(mat.type()==CV_16UC3) {

        mat.convertTo(mat, CV_8UC3, 1.0/256.0);

        return cvMat2qImage(mat);

    // 32bit floating point gray-scale image

    } else if(mat.type()==CV_32FC1) {

        cv::Mat rgb(mat.size(), CV_32FC3);

        cv::cvtColor(mat, rgb, cv::COLOR_GRAY2RGB);

        QImage img((const uchar*)rgb.data, rgb.cols, rgb.rows, rgb.step, QImage::Format_RGB32);

        img = img.copy();

        return img;

    } else {

        std::cerr << "SMVideoWidget: cv::Mat could not be converted to QImage!";

        return QImage();

    }

    // 8-bit unsigned gray-scale image

//    } else if(mat.type()==CV_8UC1) {

//        // Set the color table (used to tranMVate colour indexes to qRgb values)

//        QVector<QRgb> colorTable;

//        for (int i=0; i<256; i++)

//            colorTable.push_back(qRgb(i,i,i));

//        // Copy input Mat

//        QImage img((const uchar*)mat.data, mat.cols, mat.rows, mat.step, QImage::Format_Indexed8);

//        img.setColorTable(colorTable);

//        return img;

}

void SMVideoZoomWidget::showImageCV(cv::Mat image){

    if(image.empty())

        return;

    QImage qimage = cvMat2qImage(image);

    // If first ever camera image, fit in view

    if(item->pixmap().isNull()){

        item->setPixmap(QPixmap::fromImage(qimage));

        this->fitInView(scene->sceneRect(), Qt::KeepAspectRatio);

    } else {

        item->setPixmap(QPixmap::fromImage(qimage));

    }

}

void SMVideoZoomWidget::mousePressEvent(QMouseEvent *event)

{

//    // Drag mode : change the cursor's shape

//    if (event->button() == Qt::LeftButton)

//        this->setDragMode(QGraphicsView::ScrollHandDrag);

    QGraphicsView::mousePressEvent(event);

}

// Called when a mouse button is pressed

void SMVideoZoomWidget::mouseReleaseEvent(QMouseEvent *event)

{

//    // Exit drag mode : change the cursor's shape

//    if (event->button() == Qt::LeftButton) this->setDragMode(QGraphicsView::NoDrag);

    QGraphicsView::mouseReleaseEvent(event);

}

void SMVideoZoomWidget::wheelEvent(QWheelEvent *event)

{

    // When zooming, the view stay centered over the mouse

    this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);

    double factor = 1.3;

    if(event->delta() > 0)

        // Zoom in

        scale(factor, factor);

    else

        // Zooming out

        scale(1.0 / factor, 1.0 / factor);

    // The event is processed

    event->accept();

    if(this->horizontalScrollBar()->isVisible() || this->verticalScrollBar()->isVisible())

        this->setDragMode(QGraphicsView::ScrollHandDrag);

    else

        this->setDragMode(QGraphicsView::NoDrag);

}

// Overloaded functionthat catch the resize event

void SMVideoZoomWidget::resizeEvent(QResizeEvent *event)

{

//    // First call, the scene is created

//    if(event->oldSize().width() == -1 || event->oldSize().height() == -1) return;

//    // Get the previous rectangle of the scene in the viewport

//    QPointF P1=mapToScene(QPoint(0,0));

//    QPointF P2=mapToScene(QPoint(event->oldSize().width(),event->oldSize().height()));

//    // Stretch the rectangle around the scene

//    if (P1.x()<0) P1.setX(0);

//    if (P1.y()<0) P1.setY(0);

//    if (P2.x()>scene->width()) P2.setX(scene->width());

//    if (P2.y()>scene->height()) P2.setY(scene->height());

//    // Fit the previous area in the scene

//    this->fitInView(QRect(P1.toPoint(),P2.toPoint()),Qt::KeepAspectRatio);

    if(this->horizontalScrollBar()->isVisible() || this->verticalScrollBar()->isVisible())

        this->setDragMode(QGraphicsView::ScrollHandDrag);

    else

        this->setDragMode(QGraphicsView::NoDrag);

    QGraphicsView::resizeEvent(event);

}

// Display contextual menu

void SMVideoZoomWidget::showContextMenu(const QPoint &pos)

{

    // Get the mouse position in the scene

    QPoint globalPos = mapToGlobal(pos);

    // Create the menu and add action

    QMenu contextMenu;

    contextMenu.addAction("Reset view", this, SLOT(fitImage()));

    // Display the menu

    contextMenu.exec(globalPos);

}

void SMVideoZoomWidget::fitImage(){

    // Turn scroll bars off temporarily to get correct widget size

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    this->fitInView(scene->sceneRect(), Qt::KeepAspectRatio);

    // Restore scroll bar policy

    setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

}

SMVideoZoomWidget::~SMVideoZoomWidget(){

    if(item) delete item;

    if(scene) delete scene;

}