#include "waveprogressbar.h"
#include <QDebug>

WaveProgressBar::WaveProgressBar(QWidget *parent) : QWidget(parent)
{
    timer = new QTimer(this);
    connect(timer,&QTimer::timeout,this,[=]()
    {
        offset += 0.6;
        if( offset > width() )
            offset = 0;
        update();
    });
    timer->start(80);
}

void WaveProgressBar::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);

    QPainter painter(this);
    painter.setRenderHint( QPainter::Antialiasing, true );

    QPainterPath sinPath;
    painter.save();

    painter.setPen( Qt::NoPen );

    QLinearGradient liner(0, 0, 0, height());
    liner.setColorAt(0.0, QColor(255, 66, 213, 180));
    liner.setColorAt(1.0, QColor(43, 74, 255, 180));

    painter.setBrush( liner );
    painter.translate( 0, height()/2 );
    double trick = 4 * M_PI / width();

    for(int i=0; i<=width(); ++i)
    {
        if( i==0 )
        {
            sinPath.moveTo( i, wave*height() * qSin( trick*i + offset) - value*1.0/100 * height()  + height()/2 );
        }

        sinPath.lineTo( i, wave*height() * qSin( trick*i + offset) -  value*1.0/100 * height()  + height()/2 );
    }

    sinPath.lineTo( width() - 5, height()/2  );
    sinPath.lineTo( 0, height() / 2  );
    sinPath.closeSubpath();

    QPainterPath tmpPath;
    tmpPath.addEllipse( QPoint( width()/2,0), qMin(width(),height())/2 - wave*height() ,qMin(width(),height())/2 - wave*height() );
    QPainterPath drawPath;
    drawPath = sinPath.intersected( tmpPath );

    painter.setPen( Qt::NoPen );
    painter.drawPath( drawPath );

    QPen pen;
    pen.setWidth( 4 );
    pen.setBrush( liner );
    painter.setPen( pen );
    painter.setBrush( Qt::NoBrush );
    painter.drawPath( tmpPath );
    painter.restore();


    QFont font = painter.font();
    font.setPixelSize( qMin(width(),height())/4 );
    font.setBold(true);
    painter.setFont( font );

    pen.setColor( Qt::black );
    painter.setPen( pen );
    painter.drawText( rect(), Qt::AlignCenter, QString::number(value) + "%" );

}

int WaveProgressBar::getValue() const
{
    return value;
}

void WaveProgressBar::setValue(int value)
{
    this->value = value;
    update();
}