/***************************************************************************

    source::worx libWidgets
    Copyright © 2021 c.holzheuer
    chris@sourceworx.org

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

***************************************************************************/


#include <QPainterPath>
#include <QEvent>
#include <QCoreApplication>
#include <QPropertyAnimation>
#include <QPainter>
#include <QMouseEvent>
#include <QColor>
#include <QPen>
#include <QDebug>

#include <swtoggleswitch.h>
#include <raDIYoglobals.h>


/**
 * @brief Standardkonstruktor.
 * @param parent das Elternwidget
 * @param trackRadius Radius der Hintergrundrundung, default 16 px.
 * @param thumbRadius Radius des Schalterelements, default 20 px.
 */

SWToggleSwitch::SWToggleSwitch( QWidget* parent, int trackRadius, int thumbRadius )
    : QAbstractButton( parent )
{

    setCheckable( true );
    setAcceptDial( false );

    //setSizePolicy(QSizePolicy(QSizePolicy::Policy::Fixed, QSizePolicy::Policy::Fixed));
    _trackRadius = trackRadius;
    _thumbRadius = thumbRadius;
    _animation = new QPropertyAnimation(this);
    _animation->setTargetObject(this);

    _margin = 0 > (_thumbRadius - _trackRadius) ? 0 : (_thumbRadius - _trackRadius);
    _baseOffset = _thumbRadius > _trackRadius ? _thumbRadius : _trackRadius;
    _endOffset.insert( true, 4 * _trackRadius + 2 * _margin - _baseOffset); // width - offset
    _endOffset.insert( false, _baseOffset);
    _offset = _baseOffset;
    QPalette palette = this->palette();

    _trackColor.insert( true, QBrush( Qt::lightGray ) );
    _trackColor.insert( false, palette.dark() );

    //_thumbColor.insert( true, palette.highlight());
    _thumbColor.insert( true, QBrush( Qt::gray ) );
    //_thumbColor.insert( false, palette.light());
    _thumbColor.insert( false, QBrush( Qt::darkGray ) );
    _textColor.insert( true, palette.highlightedText().color());
    _textColor.insert( false, palette.dark().color());
    _thumbText.insert( true, "");
    _thumbText.insert( false, "");
    _opacity = 0.5;

    // semi schlimmer hack: clicks auf mich weiterleiten
    connect( this, &QAbstractButton::clicked, this, [=]{ emit widgetClicked(this); } );
}


SWToggleSwitch::~SWToggleSwitch()
{
    delete _animation;
}


/**
 * @brief Ermittelt die ideale Widgetgrösse.
 */

QSize SWToggleSwitch::sizeHint() const
{
    int w = 4 * _trackRadius + 2 * _margin;
    int h = 2 * _trackRadius + 2 * _margin;

    return QSize(w, h);
}


/**
 * @brief Setzt die geometrischen Vorgabewerte.
 * @param trackRadius Radius der Hintergrundrundung.
 * @param thumbRadius Radius des Schalterelements.
 */

void SWToggleSwitch::setTrackAndThumbRadius( int trackRadius, int thumbRadius )
{
    _trackRadius = trackRadius;
    _thumbRadius = thumbRadius;
}


/**
 * @brief Zeichnet das Widget.
 */

void SWToggleSwitch::paintEvent( QPaintEvent* )
{

    QPainter painter( this );

    QPainter::RenderHints m_paintFlags = QPainter::RenderHints(QPainter::Antialiasing |
        QPainter::TextAntialiasing);
    painter.setRenderHints(m_paintFlags, true);
    painter.setPen(Qt::NoPen);
    bool check = isChecked();

    qreal trackOpacity = _opacity;

    qreal thumbOpacity = 1.0;
    QBrush trackBrush;
    QBrush thumbBrush;

    if( isEnabled() )
    {

        trackBrush = _trackColor[check];
        thumbBrush = _thumbColor[check];

    }
    else
    {
        trackOpacity *= 0.8;
        trackBrush = this->palette().shadow();
        thumbBrush = this->palette().mid();

    }

    painter.setBrush(trackBrush);
    painter.setOpacity(trackOpacity);
    painter.drawRoundedRect( _margin, _margin, width() - 2 * _margin, height() - 2 * _margin, _trackRadius, _trackRadius );

    painter.setBrush( thumbBrush );
    painter.setOpacity( thumbOpacity );
    painter.drawEllipse( _offset - _thumbRadius, _baseOffset - _thumbRadius, 2 * _thumbRadius, 2 * _thumbRadius );

    drawMark( this );

}


void SWToggleSwitch::resizeEvent( QResizeEvent* event )
{
    QAbstractButton::resizeEvent( event );
    _offset = _endOffset.value(isChecked() );
}


void SWToggleSwitch::mouseReleaseEvent( QMouseEvent* event )
{
    QAbstractButton::mouseReleaseEvent( event );
    if( event->button() == Qt::LeftButton)
    {
        _animation->setDuration(120);
        _animation->setPropertyName("_offset");
        _animation->setStartValue(_offset);
        _animation->setEndValue(_endOffset[isChecked()]);
        _animation->start();
    }
}


void SWToggleSwitch::enterEvent( QEvent* event )
{
    setCursor(Qt::PointingHandCursor);
    QAbstractButton::enterEvent(event);
}


void SWToggleSwitch::setChecked( bool checked )
{
    QAbstractButton::setChecked( checked );
    _offset = _endOffset.value ( checked );
}


int SWToggleSwitch::offset()
{
    return _offset;
}

void SWToggleSwitch::setOffset(int value)
{
    _offset = value;
    update();
}