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/***************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact:  Qt Software Information (qt-info@nokia.com)
**
** 
** Non-Open Source Usage  
** 
** Licensees may use this file in accordance with the Qt Beta Version
** License Agreement, Agreement version 2.2 provided with the Software or,
** alternatively, in accordance with the terms contained in a written
** agreement between you and Nokia.  
** 
** GNU General Public License Usage 
** 
** Alternatively, this file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the packaging
** of this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
**
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt GPL Exception version
** 1.2, included in the file GPL_EXCEPTION.txt in this package.  
** 
***************************************************************************/
#include "rightpane.h"

#include <QtGui/QVBoxLayout>
#include <QtGui/QSplitter>
#include <QtGui/QResizeEvent>
#include <QtGui/QTextEdit>
#include <coreplugin/modemanager.h>
#include <extensionsystem/pluginmanager.h>

using namespace Core;
using namespace Core::Internal;

RightPanePlaceHolder *RightPanePlaceHolder::m_current = 0;

RightPanePlaceHolder* RightPanePlaceHolder::current()
{
    return m_current;
}

RightPanePlaceHolder::RightPanePlaceHolder(Core::IMode *mode, QWidget *parent)
    :QWidget(parent), m_mode(mode)
{
    setLayout(new QVBoxLayout);
    layout()->setMargin(0);
    connect(Core::ModeManager::instance(), SIGNAL(currentModeChanged(Core::IMode *)),
            this, SLOT(currentModeChanged(Core::IMode *)));
}

RightPanePlaceHolder::~RightPanePlaceHolder()
{
    if (m_current == this) {
        RightPaneWidget::instance()->setParent(0);
        RightPaneWidget::instance()->hide();
    }
}

void RightPanePlaceHolder::applyStoredSize(int width)
{
    if (width) {
        QSplitter *splitter = qobject_cast<QSplitter *>(parentWidget());
        if (splitter) {
            // A splitter we need to resize the splitter sizes
            QList<int> sizes = splitter->sizes();
            int index = splitter->indexOf(this);
            int diff = width - sizes.at(index);
            int adjust = sizes.count() > 1? ( diff / (sizes.count() - 1)) : 0;
            for(int i=0; i<sizes.count(); ++i) {
                if (i != index)
                    sizes[i] -= adjust;
            }
            sizes[index]= width;
            splitter->setSizes(sizes);
        } else {
            QSize s = size();
            s.setWidth(width);
            resize(s);
        }
    }
}

// This function does work even though the order in which
// the placeHolder get the signal is undefined.
// It does ensure that after all PlaceHolders got the signal
// m_current points to the current PlaceHolder, or zero if there
// is no PlaceHolder in this mode
// And that the parent of the RightPaneWidget gets the correct parent
void RightPanePlaceHolder::currentModeChanged(Core::IMode *mode)
{
    if (m_current == this) {
        m_current = 0;
        RightPaneWidget::instance()->setParent(0);
        RightPaneWidget::instance()->hide();
    }
    if (m_mode == mode) {
        m_current = this;

        int width = RightPaneWidget::instance()->storedWidth();

        layout()->addWidget(RightPaneWidget::instance());
        RightPaneWidget::instance()->show();

        applyStoredSize(width);
        setVisible(RightPaneWidget::instance()->isShown());
    }
}

/////
// RightPaneWidget
/////


RightPaneWidget *RightPaneWidget::m_instance = 0;

RightPaneWidget::RightPaneWidget()
    :m_shown(true), m_width(0)
{
    m_instance = this;

    QVBoxLayout *layout = new QVBoxLayout;
    layout->setMargin(0);
    setLayout(layout);

    ExtensionSystem::PluginManager *pm = ExtensionSystem::PluginManager::instance();

    BaseRightPaneWidget *rpw = pm->getObject<BaseRightPaneWidget>();
    if (rpw) {
        layout->addWidget(rpw->widget());
    }
    connect(pm, SIGNAL(objectAdded(QObject *)),
            this, SLOT(objectAdded(QObject *)));
    connect(pm, SIGNAL(aboutToRemoveObject(QObject *)),
            this, SLOT(aboutToRemoveObject(QObject *)));
}

RightPaneWidget::~RightPaneWidget()
{
    m_instance = 0;
}

void RightPaneWidget::objectAdded(QObject *obj)
{
    BaseRightPaneWidget *rpw = qobject_cast<BaseRightPaneWidget *>(obj);
    if (rpw) {
        layout()->addWidget(rpw->widget());
        setFocusProxy(rpw->widget());
    }
}

void RightPaneWidget::aboutToRemoveObject(QObject *obj)
{
    BaseRightPaneWidget *rpw = qobject_cast<BaseRightPaneWidget *>(obj);
    if (rpw) {
        delete rpw->widget();
    }
}

RightPaneWidget *RightPaneWidget::instance()
{
    return m_instance;
}

int RightPaneWidget::storedWidth()
{
    return m_width;
}

void RightPaneWidget::resizeEvent(QResizeEvent *re)
{
    if (m_width && re->size().width())
        m_width = re->size().width();
    QWidget::resizeEvent(re);
}

void RightPaneWidget::saveSettings(QSettings *settings)
{
    settings->setValue("RightPane/Visible", isShown());
    settings->setValue("RightPane/Width", m_width);
}

void RightPaneWidget::readSettings(QSettings *settings)
{
    if (settings->contains("RightPane/Visible")) {
        setShown(settings->value("RightPane/Visible").toBool());
    } else {
        setShown(false); //TODO set to false
    }

    if (settings->contains("RightPane/Width")) {
        m_width = settings->value("RightPane/Width").toInt();
        if (!m_width)
            m_width = 500;
    } else {
        m_width = 500; //pixel
    }
    // Apply
    if (RightPanePlaceHolder::m_current) {
        RightPanePlaceHolder::m_current->applyStoredSize(m_width);
    }
}

void RightPaneWidget::setShown(bool b)
{
    if (RightPanePlaceHolder::m_current)
        RightPanePlaceHolder::m_current->setVisible(b);
    m_shown = b;
}

bool RightPaneWidget::isShown()
{
    return m_shown;
}

/////
// BaseRightPaneWidget
/////

BaseRightPaneWidget::BaseRightPaneWidget(QWidget *widget)
{
    m_widget = widget;
}

BaseRightPaneWidget::~BaseRightPaneWidget()
{

}

QWidget *BaseRightPaneWidget::widget() const
{
    return m_widget;
}