#include "secondScreen.hpp"

SecondScreen::SecondScreen(QStackedWidget* swgt, SecondScreen* pointer) :QScrollArea(pointer) {
    flag = true;

    /**
     * Install the fixed size for scroll widget of second screen
     */

    this->setFixedSize(QApplication::desktop()->availableGeometry(swgt).width(), QApplication::desktop()->availableGeometry(swgt).height());
    this->setHorizontalScrollBarPolicy(ScrollBarAlwaysOff);

    QPalette plt;
    plt.setColor(this->backgroundRole(), gray);
    this->setPalette(plt);
    this->setFrameStyle(NoFrame);
    this->setContentsMargins(0, 0, 0, 0);
    this->setAutoFillBackground(true);

    this->verticalScrollBar()->setStyleSheet("QScrollBar:vertical {"
                                             "  border: none;"
                                             "  background-color: blue;"
                                             "  width: 20px;"
                                             "  margin: 0px 0px 0px 0px;"
                                             "}"
                                             "QScrollBar::handle {"
                                             "  background: #000000;"
                                             "  border-radius: 6px;"
                                             "  origin: padding;"
                                             "  margin: 0px 3px 0px 3px;"
                                             "}"
                                             "QScrollBar::add-line:vertical {"
                                             "  height: 0px;"
                                             "}"
                                             "QScrollBar::sub-line:vertical {"
                                             "  height: 0px;"
                                             "}");

    /**
     * Install the fixed size for scroll widget of second screen
     */

    QWidget* wgt = new QWidget;

    /**
     * Create the needing objects for second screen
     */

    WidgetOfSecondScreen* widgetOfSecondScreen = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen2 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen3 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen4 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen5 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen6 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen7 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen8 = new WidgetOfSecondScreen(this);
    WidgetOfSecondScreen* widgetOfSecondScreen9 = new WidgetOfSecondScreen(this);

    /**
     * Create the layout of second screen
     */

    QVBoxLayout* pvbox = new QVBoxLayout;
    pvbox->setContentsMargins(0, 0, 0, 0);
    pvbox->setSpacing(0);
    pvbox->addWidget(widgetOfSecondScreen);
    pvbox->addWidget(widgetOfSecondScreen2);
    pvbox->addWidget(widgetOfSecondScreen3);
    pvbox->addWidget(widgetOfSecondScreen4);
    pvbox->addWidget(widgetOfSecondScreen5);
    pvbox->addWidget(widgetOfSecondScreen6);
    pvbox->addWidget(widgetOfSecondScreen7);
    pvbox->addWidget(widgetOfSecondScreen8);
    pvbox->addWidget(widgetOfSecondScreen9);
    pvbox->setAlignment(AlignTop);

    /**
     * Install the created layout to main widget of second screen
     */

    wgt->setLayout(pvbox);

    /**
     * Install the main widget of second screen to scroll widget of second screen
     */

    this->setWidget(wgt);
    this->viewport()->setAttribute(WA_AcceptTouchEvents);

    /*
     * Create the effect for scrollbar
     */

    QGraphicsOpacityEffect* opacityEffect = new QGraphicsOpacityEffect;
    this->verticalScrollBar()->setGraphicsEffect(opacityEffect);

    /**
     * Create the machine of states
     */

    pmch = new QStateMachine;

    /**
     * Create the 2 states of scrollbar
     */

    QState* pstateOff = new QState(pmch);
    pstateOff->assignProperty(opacityEffect, "opacity", 0.0);
    pmch->setInitialState(pstateOff);

    QState* pstateOn = new QState(pmch);
    pstateOn->assignProperty(opacityEffect, "opacity", 1.0);

    /**
     * Create the signal transition between 2 states
     */

    QSignalTransition* psignal1 = pstateOff->addTransition(this, SIGNAL(scrolling()), pstateOn);
    QSignalTransition* psignal2 = pstateOn->addTransition(this, SIGNAL(stopScrolling()), pstateOff);

    /**
     * Add animation to transition
     */

    QPropertyAnimation* panim1 = new QPropertyAnimation(opacityEffect, "opacity");
    panim1->setDuration(1000);
    panim1->setEasingCurve(QEasingCurve::InSine);
    psignal1->addAnimation(panim1);

    QPropertyAnimation* panim2 = new QPropertyAnimation(opacityEffect, "opacity");
    panim2->setDuration(1000);
    panim2->setEasingCurve(QEasingCurve::InSine);
    psignal2->addAnimation(panim2);

    /**
     * Launch the state machine
     */

    pmch->start();
}

/**
 * Create the handler of touch events
 */

bool SecondScreen::viewportEvent(QEvent* event) {
    if (event->type() == QEvent::TouchBegin || event->type() == QEvent::TouchUpdate || event->type() == QEvent::TouchEnd) {
        if(flag) {
            emit scrolling();
            flag = false;
        }
        listOfTouches << static_cast<QTouchEvent*>(event)->touchPoints().first();
        if (listOfTouches.count() == 2) {
            this->verticalScrollBar()->setValue(this->verticalScrollBar()->value() + int(listOfTouches[0].pos().y()-listOfTouches[1].pos().y()));
            listOfTouches.clear();
        }
        if (event->type() == QEvent::TouchEnd && listOfTouches.count() != 0) {
                listOfTouches.clear();
                emit stopScrolling();
                flag = true;
        }
        if (event->type() == QEvent::TouchEnd && listOfTouches.count() == 0) {
            emit stopScrolling();
            flag = true;

        }
    }
    return true;
}