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#include <QtGui>

#include "button.h"

#include "theme.h"

static const int MinTextWidthAsChars = 8;

class ButtonPrivate {

    Q_DECLARE_PUBLIC(Button)

public:

    ButtonPrivate(Button *button) 

       : down(false)

       , q_ptr(button)

    {

        textItem = new QGraphicsSimpleTextItem(q_ptr);

    }

    QGraphicsSimpleTextItem *textItem;

    bool down;

    Button *q_ptr;

};

Button::Button(const QString &text, QGraphicsItem *parent, QSizeF minimumSize)

    : QGraphicsWidget(parent)

    , d_ptr(new ButtonPrivate(this)), m_background(), m_selected(false)

{ 

    Q_D(Button);

    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);

    //setCacheMode(QGraphicsItem::ItemCoordinateCache);

    if(minimumSize.isValid())

        setMinimumSize(minimumSize);

    setContentsMargins(0, 0, 0, 0);

    d->textItem->setText(text);

    prepareGeometryChange();

    m_font = Theme::p()->font(Theme::MenuItem);

    d->textItem->setFont(m_font);

    connect(Theme::p(), SIGNAL(themeChanged()), this, SLOT(themeChange()));

}

Button::~Button()

{

    delete d_ptr;

}

bool Button::isDown()

{

    Q_D(Button);

    return d->down;

}

void Button::setText(const QString &text)

{

    Q_D(Button);

    d->textItem->setText(text);

    update();

}

QString Button::text()

{

    Q_D(Button);

    return d->textItem->text();

}

void Button::paint(QPainter *painter, 

        const QStyleOptionGraphicsItem *option, 

        QWidget *widget)

{

    Q_UNUSED(widget);

    Q_UNUSED(option);

    if(!m_background.isNull())

        painter->drawPixmap(QPoint(), m_background);

    if(m_selected) {

        painter->setBrush(Qt::black);

        painter->setOpacity(0.2);

        painter->drawRect(boundingRect().toRect());

    }

}

QSizeF Button::sizeHint(Qt::SizeHint which, 

        const QSizeF &constraint) const 

{

    Q_D(const Button);

    switch (which)

    {

    case Qt::MinimumSize:

         {

         QFontMetricsF fm(d->textItem->font());

         return QSizeF(MinTextWidthAsChars * fm.maxWidth(), fm.height());

         }

     case Qt::PreferredSize:

         {

         QFontMetricsF fm(d->textItem->font());

         return QSizeF(fm.width(d->textItem->text()), fm.height());

         }

    default:

        return QGraphicsWidget::sizeHint(which, constraint);

    }

}

void Button::mousePressEvent(QGraphicsSceneMouseEvent *event)

{

    Q_D(Button);

    if (event->button() != Qt::LeftButton ||

                  !sceneBoundingRect().contains(event->scenePos()))

        return;

    d->down = true;

    prepareGeometryChange();

    emit pressed();

}

void Button::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)

{

    Q_D(Button);

    if (!d->down || event->button() != Qt::LeftButton) 

        return;

    d->down = false;

    prepareGeometryChange();

    emit released();

    if (sceneBoundingRect().contains(event->scenePos()))

        emit clicked();

}

void Button::mouseMoveEvent(QGraphicsSceneMouseEvent *event)

{

    Q_UNUSED(event);

}

void Button::resizeEvent(QGraphicsSceneResizeEvent *event)

{

    Q_D(Button);

    QGraphicsWidget::resizeEvent(event);

    QRectF rect = d->textItem->boundingRect();

    QRectF buttonrect = this->boundingRect();

    d->textItem->setPos((buttonrect.width() - rect.width())/2, (buttonrect.height() - rect.height())/2 );

    QSize currentSize = buttonrect.size().toSize();

    if( m_background.size() != currentSize && (currentSize.width() > 0 && currentSize.height() > 0)  ) {

        m_background = Theme::p()->pixmap("status_field_middle.svg", buttonrect.size().toSize());

    }

}

void Button::setBackground(QPixmap& background)

{

    m_background = background;

}

void Button::themeChange()

{

    Q_D(Button);

    m_font = Theme::p()->font(Theme::MenuItem);

    d->textItem->setFont(m_font);

}