#include "chart.h"
#include <QtWidgets/QGesture>
#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
#include <QLineSeries>
#include <QValueAxis>
#include <iostream>
#include <QGraphicsSceneEvent>

Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
    : QChart(QChart::ChartTypeCartesian, parent, wFlags)
{
    setContentsMargins(0, 0, 0, 0);
    setMargins(QMargins(0,0,0,0));
    setBackgroundRoundness(0);
}

Chart::~Chart() {

}

bool Chart::sceneEvent(QEvent *event) {
    if (event->type() == QEvent::Gesture)
        return gestureEvent(static_cast<QGestureEvent *>(event));
    if (event->type() == QEvent::GraphicsSceneWheel) {
        QGraphicsSceneWheelEvent *swe = static_cast<QGraphicsSceneWheelEvent*>(event);
        return myWheelEvent(swe);
    }
    return QChart::event(event);
}

bool Chart::gestureEvent(QGestureEvent *event) {
    if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
        QPanGesture *pan = static_cast<QPanGesture *>(gesture);
        QChart::scroll(-(pan->delta().x()), pan->delta().y());
    }
    if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
        QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture);
        if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
            QChart::zoom(pinch->scaleFactor());

    }
    return true;
}

bool Chart::myWheelEvent(QGraphicsSceneWheelEvent *event) {
    bool in = event->delta() > 0;
    bool scale_x = event->scenePos().x() > this->geometry().right()/4;
    QRectF view = plotArea();
    qreal zoom = 0.1;
    qreal dwidth = view.width() * (scale_x ? (in ? -1.0 : 1.0) * zoom/2 : 0.0);
    qreal dheight = view.height() * (scale_x ? 0.0 : (in ? -1.0 : 1.0) * zoom/2);
    view.adjust(dwidth/2, dheight/2, -1.0 * dwidth/2, -1.0 * dheight/2);
    this->zoomIn(view);
    return true;
}

void Chart::XRangeChanged(qreal min, qreal max) {
    emit newDataRequest(this->entityId, min, max);
    /*
    if (series().at(0)->type() == QtCharts::QAbstractSeries::SeriesTypeLine) {
    QLineSeries *s = static_cast<QLineSeries *>(series().at(0));
    if (max > s->at(s->count()-1).x()) {
    }
  }
  */
}