/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
 *
 *   Copyright 2010 Leo Franchi <lfranchi@kde.org>
 *
 *   Tomahawk 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 3 of the License, or
 *   (at your option) any later version.
 *
 *   Tomahawk is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Tomahawk. If not, see <http://www.gnu.org/licenses/>.
 */

#include "LoadingSpinner.h"

#include <QTimeLine>
#include <QPaintEvent>
#include <QPainter>
#include <QMovie>
#include <QLabel>

#include "utils/tomahawkutils.h"
#include "utils/logger.h"

#define ANIM_LENGTH 300


LoadingSpinner::LoadingSpinner( QWidget* parent )
    : QWidget( parent )
    , m_showHide( new QTimeLine )
{
    m_showHide->setDuration( 300 );
    m_showHide->setStartFrame( 0 );
    m_showHide->setEndFrame( 100 );
    m_showHide->setUpdateInterval( 20 );
    connect( m_showHide, SIGNAL( frameChanged( int ) ), this, SLOT( update() ) );
    connect( m_showHide, SIGNAL( finished() ), this, SLOT( hideFinished() ) );

    m_anim = new QMovie( RESPATH "/images/loading-animation.gif" );
    m_anim->jumpToNextFrame();

    connect( m_anim, SIGNAL( frameChanged( int ) ), this, SLOT( update() ) );

    resize( m_anim->currentPixmap().size() );
    setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
    hide();
}


LoadingSpinner::~LoadingSpinner()
{
}


void
LoadingSpinner::fadeIn()
{
    if ( isVisible() )
        return;

    show();

    m_anim->start();
    m_showHide->setDirection( QTimeLine::Forward );

    if ( m_showHide->state() != QTimeLine::Running )
        m_showHide->start();
}


void
LoadingSpinner::fadeOut()
{
    m_showHide->setDirection( QTimeLine::Backward );

    if ( m_showHide->state() != QTimeLine::Running )
        m_showHide->start();
}


void
LoadingSpinner::hideFinished()
{
    if ( m_showHide->direction() == QTimeLine::Backward )
    {
        hide();
        m_anim->stop();
    }
}


QSize
LoadingSpinner::sizeHint() const
{
    return m_anim->currentPixmap().size();
}


void
LoadingSpinner::paintEvent( QPaintEvent* ev )
{
    Q_UNUSED( ev );

    if ( !parentWidget() )
        return;

    QPoint center( ( parentWidget()->width() / 2 ) - ( width() / 2 ), ( parentWidget()->height() / 2 ) - ( height() / 2 ) );
    if ( center != pos() )
    {
        move( center );
        return;
    }

    QPainter p( this );

    if ( m_showHide->state() == QTimeLine::Running )
    { // showing or hiding
        p.setOpacity( (qreal)m_showHide->currentValue() );
    }

    p.drawPixmap( rect(), m_anim->currentPixmap() );
}