#include "rollswitchwidget.h"
#include <QMouseEvent>
#include <QPainter>
#include<QPen>
#include <QDebug>
#include <qmath.h>

RollSwitchWidget::RollSwitchWidget(QWidget *parent)
    : QWidget(parent),
      m_text("SERIAL  %1"),
      m_index(0),
      m_count(3)
{

}

void RollSwitchWidget::setCount(int count)
{
    m_count = count;
}

int RollSwitchWidget::currentIndex()
{
    return m_index;
}

QPoint getPoint(int r, int angle)
{
    int x1 = r * qCos(angle * M_PI / 180);
    int y1 = r * qSin(angle * M_PI /180);

    return QPoint(x1, y1);
}

void RollSwitchWidget::paintEvent(QPaintEvent *e)
{
    QWidget::paintEvent(e);
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing);
    QMargins margins = contentsMargins();

    QFont f =  this->font();
    f.setPointSizeF(f.pointSizeF()+1);
    f.setBold(true);
    painter.setFont(f);

    QRect rect = this->rect().adjusted(margins.left(), margins.top(), - margins.bottom(), -margins.right());

    int textX = rect.width()/3;
    int textY = rect.y();
    QString text = QString(m_text).arg(m_index+1);

    QRectF textRect(textX, textY, textX, rect.height());
    QTextOption option(Qt::AlignCenter);
    QRectF fixRect = painter.boundingRect(textRect, text, option);
    painter.save();
    //painter.setPen(QColor(141, 141, 141));
    painter.setPen(QColor(56, 56, 56));
    painter.drawText(fixRect, text);
    painter.restore();

    m_leftRect= QRect(rect.x(), rect.y(), textX, rect.height());
    m_rightRect = QRect(rect.x() +textX*2, rect.y(), textX, rect.height());

    int r = m_leftRect.height()/2;
    QPointF center(m_leftRect.x()+ m_leftRect.width()/2,
                  m_leftRect.y() +m_leftRect.height()/2);


    QPen pen(Qt::gray);
    pen.setWidthF(2.5);

    painter.save();

    QPalette palette = this->palette();
    palette.setCurrentColorGroup(QPalette::Disabled);
//    if(currentIndex() == 0)
//    {
//        pen.setColor(palette.color(QPalette::Text));
//    }
    painter.setPen(pen);
    painter.translate(center);
    painter.drawLine(QPointF(0,0), getPoint(m_leftRect, 30));
    painter.drawLine(QPointF(0,0), getPoint(m_leftRect, -30));
    painter.restore();

    center = QPointF(m_rightRect.x() + m_rightRect.width()/2,
                m_rightRect.y() + m_rightRect.height()/2);
    painter.save();
    pen.setColor(Qt::gray);
//    if(currentIndex() == m_count-1)
//    {
//        pen.setColor(palette.color(QPalette::Text));
//    }
    painter.setPen(pen);
    painter.translate(center);
    painter.drawLine(QPointF(0,0), getPoint(m_rightRect, 150));
    painter.drawLine(QPointF(0,0), getPoint(m_rightRect, -150));
    painter.restore();

}

void RollSwitchWidget::mousePressEvent(QMouseEvent *e)
{
    if(m_leftRect.contains(e->pos()))
    {
        m_index --;
    }else if(m_rightRect.contains(e->pos()))
    {
        m_index ++;
    }

    if(m_index <0)
    {
        m_index =2;
    }if(m_index >= m_count)
    {
        m_index =0;
    }
    this->update();
    emit indexChange(m_index);

}

QPointF RollSwitchWidget::getPoint(const QRect &rect, int angle)
{
    int r = rect.width()/2;
    if(rect.width() >rect.height())
    {
        r = rect.height()/2;
    }

    int x1 = r * qCos(angle * M_PI / 180);
    int y1 = r * qSin(angle * M_PI /180);

    return QPointF(x1, y1);

}