#include "LoadingWidget.h"

#include <QTimer>
#include <QtMath>
#include <QPainter>
#include <QDebug>

LoadingWidget::LoadingWidget(QWidget* aParent)
    : QWidget(aParent)
    , mTimer(new QTimer(this))
    , mColor(QColor(Qt::white))
    , mCount(12)
    , mMaxDiameter(30)
    , mMinDiameter(5)
{
    connect(mTimer,&QTimer::timeout,this,QOverload<>::of(&QWidget::repaint));
    initPaintArea();
}

LoadingWidget::~LoadingWidget()
{

}

void LoadingWidget::setMaxDiameter(const int aValue)
{
    mMaxDiameter = aValue;
}

void LoadingWidget::setMinDiameter(const int aValue)
{
    mMinDiameter = aValue;
}

void LoadingWidget::setColor(const QColor& aColor)
{
    mColor = aColor;
}

void LoadingWidget::setCount(const int aCount)
{
    mCount = aCount;
}

void LoadingWidget::resizeEvent(QResizeEvent *aEvent)
{
    QWidget::resizeEvent(aEvent);
    initPaintArea();
}

void LoadingWidget::showEvent(QShowEvent *aEvent)
{
    QWidget::showEvent(aEvent);
    mTimer->start(60);
}

void LoadingWidget::hideEvent(QHideEvent *aEvent)
{
    QWidget::hideEvent(aEvent);
    mTimer->stop();
}

void LoadingWidget::initPaintArea()
{
    double halfWidth = width() /2;
    double halfHeight = height() /2;
    double half = qMin(width(),height())/2;
    double distance = half - mMaxDiameter/2 - 1;

    double gap = (mMaxDiameter - mMinDiameter)/(mCount-1)/2;
    double angleGap = 360/mCount;

    mPointList.clear();
    mRadiusList.clear();

    for(int i=0;i<mCount;i++)
    {
        mRadiusList << mMaxDiameter/2-i*gap;
        double radian = qDegreesToRadians(angleGap*i);
        mPointList.append(QPointF(halfWidth + distance*qCos(radian),halfHeight - distance*qSin(radian)));
    }
}

void LoadingWidget::paintEvent(QPaintEvent *aEvent)
{
    if(mStatus == mCount)
    {
        mStatus = 0;
    }
    QWidget::paintEvent(aEvent);
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setPen(mColor);
    painter.setBrush(mColor);
    for(int i=0;i<mCount;i++)
    {
        double radius= mRadiusList.at((mStatus + i)%mCount);
        painter.drawEllipse(mPointList.at(i),radius,radius);
    }
    ++mStatus;
}