/**
 ******************************************************************************
 *
 * @file       rightpane.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
 * @addtogroup GCSPlugins GCS Plugins
 * @{
 * @addtogroup CorePlugin Core Plugin
 * @{
 * @brief The Core GCS plugin
 *****************************************************************************/
/*
 * 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 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "rightpane.h"

#include <coreplugin/modemanager.h>
#include <extensionsystem/pluginmanager.h>

#include <QtCore/QSettings>

#include <QtGui/QVBoxLayout>
#include <QtGui/QSplitter>
#include <QtGui/QResizeEvent>
#include <QtGui/QTextEdit>


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;
}
