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

    source::worx raDIYo
    Copyright © 2020-2022 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 <QDebug>
#include <QPainter>
#include <QMouseEvent>
#include <QtGlobal>

#include <raDIYo.h>
#include <swvolumewidget.h>


/**
 * @brief Standardkonstruktor.  Block- und Balkenanzahl auf 32
 * @see setNumblocks
 * @see setNumBars
 */

SWVolumeWidget::SWVolumeWidget( QWidget* parent )
    : SWBarWidget( parent )
{
    setNumBlocks( 32 );
    setNumBars( 32 );

}


/**
 * @brief Wird aufgerufen, wenn das (externe) Dial gedreht wurde.
 *
 * Hier wird _ein_  Wert gesetzt, zum Beispiel Lautstärke, Bässe,
 * Höhen etc.
 */

void SWVolumeWidget::onDialDeltaChanged( int delta )
{

 // gültigkeit sicherstellen
    int newval = _value + delta;
    newval = qBound( _rangeFrom, newval, _rangeTo );

    if( _value == newval )
        return;

   setValue( newval );
   update();


}


/**
 * @brief Teil der Maussteuerung.
 * @param event
 */

void SWVolumeWidget::mousePressEvent( QMouseEvent* event )
{
    if( event->button() == Qt::LeftButton )
        _moving = true;
}


/**
 * @brief Zieht bei gedrücktem Mousebutton die Lautstärke hoch bzw. runter
 * @param event
 */

void SWVolumeWidget::mouseMoveEvent( QMouseEvent* event )
{

    if( ( event->buttons() & Qt::LeftButton ) && _moving )
    {       
        double newX = (double) _rangeTo * (double) event->pos().x() / ( rect().width() - _frameOffset );
        int lstVal = _value;
        _value = qRound( newX );
        int delta = _value - lstVal;
        if( !delta )
           return;
        update();
        emit deltaChanged( delta > 0 ? 1 : -1 );

    }

}


/**
 * @brief Teil der Maussteuerung.
 * @param event
 */

void SWVolumeWidget::mouseReleaseEvent( QMouseEvent* event )
{
    if( event->button() == Qt::LeftButton && _moving )
        _moving = false;
}


/**
 * @brief Zeichnet das Balkendiagramm.
 * @param event
 */

void SWVolumeWidget::paintEvent( QPaintEvent* event )
{

    Q_UNUSED( event )


    QPainter painter( this );

    // wir malen ein dunkles Rähmchen um eine graue Fläche
    QPen pen( QColor( 66,66,66 ) );
    pen.setWidth( 2 );
    painter.setPen( pen );
    QRect frame = rect();
    frame.adjust( _frameOffset, _frameOffset, -_frameOffset, -_frameOffset );
    painter.fillRect( frame, QColor( 44,44,44 ) );
    painter.drawRoundedRect( frame, 2, 2 );

    double sizeX = frame.width();
    double sizeY = frame.height();

    int blockWidth  = qRound( sizeX / _numBars );
    int blockHeight = qRound( sizeY / _numBlocks );

    //_padding = 2;

    int numColors = _colors.size();
    double factorColors = (double) numColors /  (double) _numBlocks;
    int blockPosX = _frameOffset + _padding;
    int maxX = qRound( (double) _value / double( _rangeTo ) * sizeX );
    int maxBlocks = (double) sizeY / blockHeight - 3;

    for( ; blockPosX < maxX; blockPosX += blockWidth )
    {
        // hack
        int numBlocks = qMin( 1 + qRound( (double) blockPosX / sizeX * maxBlocks ), maxBlocks );
        int blockPosY = sizeY - blockHeight;// + _padding;
        for( int j = 0; j < numBlocks; ++j )
        {
            QRect blockRect = QRect( blockPosX, blockPosY, blockWidth - _padding, blockHeight - _padding );
            int colorIndex = numColors - 1 - factorColors * (double) j;
            //int colorIndex = 2 + factorColors * (double) j;
            painter.fillRect( blockRect, _colors[ colorIndex ] );
            blockPosY -= blockHeight;
        }


    }


}