/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
 *
 *   Copyright 2010-2011, 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 "JobStatusDelegate.h"

#include "JobStatusModel.h"
#include "utils/TomahawkUtilsGui.h"
#include "utils/Logger.h"

#include <QPainter>
#include <QApplication>
#include <QListView>

#define ROW_HEIGHT ( TomahawkUtils::defaultFontHeight() + 6 )
#define ICON_PADDING 2
#define PADDING 2


JobStatusDelegate::JobStatusDelegate( QObject* parent )
    : QStyledItemDelegate ( parent )
    , m_parentView( qobject_cast< QListView* >( parent ) )
{
    Q_ASSERT( m_parentView );
}


JobStatusDelegate::~JobStatusDelegate()
{
}


void
JobStatusDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
{
    QStyleOptionViewItem opt = option;
    initStyleOption( &opt, index );
    QFontMetrics fm( painter->font() );
    const bool allowMultiLine = index.data( JobStatusModel::AllowMultiLineRole ).toBool();

    opt.state &= ~QStyle::State_MouseOver;
    QApplication::style()->drawPrimitive( QStyle::PE_PanelItemViewItem, &opt, painter, opt.widget );

//     painter->drawLine( opt.rect.topLeft(), opt.rect.topRight() );

    painter->setRenderHint( QPainter::Antialiasing );
    QRect iconRect( ICON_PADDING, ICON_PADDING + opt.rect.y(), ROW_HEIGHT - 2 * ICON_PADDING, ROW_HEIGHT - 2 * ICON_PADDING );
    if ( allowMultiLine )
        iconRect.moveTop( opt.rect.top() + opt.rect.height() / 2 - iconRect.height() / 2);
    QPixmap p = index.data( Qt::DecorationRole ).value< QPixmap >();
    if ( !p.isNull() )
    {
        p = p.scaledToHeight( iconRect.height(), Qt::SmoothTransformation );
        painter->drawPixmap( iconRect, p );
    }

    // draw right column if there is one
    const QString rCol = index.data( JobStatusModel::RightColumnRole ).toString();
    int rightEdge = opt.rect.right();
    if ( !rCol.isEmpty() )
    {
        const int w = fm.width( rCol );
        const QRect rRect( opt.rect.right() - PADDING - w, PADDING + opt.rect.y(), w, opt.rect.height() - 2 * PADDING );
        painter->drawText( rRect, Qt::AlignCenter, rCol );

        rightEdge = rRect.left();
    }

    const int mainW = rightEdge - 6 * PADDING - iconRect.right();
    QString mainText = index.data( Qt::DisplayRole ).toString();
    QTextOption to( Qt::AlignLeft | Qt::AlignVCenter );
    if ( !allowMultiLine )
    {
        to.setWrapMode( QTextOption::NoWrap );
        mainText = fm.elidedText( mainText, Qt::ElideRight, mainW );
    }
    else
        to.setWrapMode( QTextOption::WrapAtWordBoundaryOrAnywhere );

    painter->drawText( QRect( iconRect.right() + 4 * PADDING, PADDING + opt.rect.y(), mainW, opt.rect.height() - 2 * PADDING ), mainText, to );
}


QSize
JobStatusDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
{
    const bool allowMultiLine = index.data( JobStatusModel::AllowMultiLineRole ).toBool();

    if ( !allowMultiLine )
        return QSize( QStyledItemDelegate::sizeHint( option, index ).width(), ROW_HEIGHT );
    else if ( m_cachedMultiLineHeights.contains( index ) )
        return QSize( QStyledItemDelegate::sizeHint( option, index ).width(), m_cachedMultiLineHeights[ index ] );

    // Don't elide, but stretch across as many rows as required
    QStyleOptionViewItem opt = option;
    initStyleOption( &opt, index );

    const QString text = index.data( Qt::DisplayRole ).toString();
    const int leftEdge =  ICON_PADDING + ROW_HEIGHT + 2 * PADDING;
    const QRect rect = opt.fontMetrics.boundingRect( leftEdge, opt.rect.top(), m_parentView->width() - leftEdge, 200, Qt::AlignLeft | Qt::AlignTop | Qt::TextWordWrap, text );

    m_cachedMultiLineHeights.insert( index, rect.height() + 4 * PADDING );

    return QSize( QStyledItemDelegate::sizeHint ( option, index ).width(), rect.height() + 4 * PADDING );
}