/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include <QPainter>

#include <QRectF>

#include <QGraphicsLinearLayout>

#include <HbInstance>

#include "hsdomainmodeldatastructures.h"

#include "hspage.h"

#include "hsscene.h"

#include "hsdatabase.h"

#include "hswidgethost.h"

#include "hswallpaper.h"

#include "hswidgetpositioningonwidgetadd.h"

/*!

    \class HsPage

    \ingroup group_hsutils

    \brief Represents a page in the framework.

    HsPage is a parent for a group of widgets. HsPage can have a wallpaper.

*/

/*!

    Constructor.

    \a parent Owner.

    \a aFlags Window flags.

*/

HsPage::HsPage(QGraphicsItem* parent)

    : HbWidget(parent),

      mDatabaseId(-1),

      mRemovable(true)

{

    setFlag(QGraphicsItem::ItemHasNoContents);

    setSizePolicy(QSizePolicy(QSizePolicy::Ignored,

                              QSizePolicy::Ignored));

}

/*!

    Destructor.

*/

HsPage::~HsPage()

{

}

/*!

    Returns the database id.

*/

int HsPage::databaseId() const

{

    return mDatabaseId;

}

/*!

    Sets the database id to \a id.

*/

void HsPage::setDatabaseId(int id)

{

    mDatabaseId = id;

}

/*!

    Loads widgets.

*/

bool HsPage::load()

{

    if (mDatabaseId < 0) {

        return false;

    }

    HsDatabase *db = HsDatabase::instance();

    QList<HsWidgetData> datas;

    if (!db->widgets(mDatabaseId, datas)) {

        return false;

    }

    foreach (HsWidgetData data, datas) {

        QScopedPointer<HsWidgetHost> widget(new HsWidgetHost(data.id));

        if(!widget->load() || !widget->isValid()) {

            continue;

		}

        connectWidget(widget.data());

        widget->setPage(this);

        widget->initializeWidget();

        widget->showWidget();

        mWidgets.append(widget.data());

        widget->setParentItem(this);

        widget.take(); // now this page owns widget

    }

    return true;

}

bool HsPage::addExistingWidget(HsWidgetHost *widgetHost)

{

    if (!widgetHost) {

        return false;

    }

    if (mWidgets.contains(widgetHost)) {

        return true;

    }

    if (!widgetHost->setPage(this)) {

        return false;

    }

    connectWidget(widgetHost);

    mWidgets << widgetHost;

    widgetHost->setParentItem(this);

    return true;

 }

bool HsPage::removeWidget(HsWidgetHost *widgetHost)

{

    if (!widgetHost || !widgetHost->setPage(0)) {

        return false;

    }

    disconnectWidget(widgetHost);

    mWidgets.removeOne(widgetHost);

    widgetHost->setParentItem(0);

    return true;

}

QList<HsWidgetHost *> HsPage::newWidgets()

{

    return mNewWidgets;

}

/*!

    Adds new widget into a page. Returns true if successfull.

*/

bool HsPage::addNewWidget(HsWidgetHost* widgetHost)

{

    if (!widgetHost || mWidgets.contains(widgetHost)) {

        return false;

    }

    if (mNewWidgets.contains(widgetHost)) {

        return true;

    }

    // Set presentation.

    QString key = HsScene::orientation() == Qt::Horizontal ?

        "landscape" : "portrait";

    HsWidgetPresentationData presentation;

    if (!widgetHost->widgetPresentationData(key, presentation)) {

        presentation.key = key;

        presentation.setPos(QPointF());

        presentation.zValue = 0;

        widgetHost->setWidgetPresentationData(presentation);

    }

    widgetHost->hide();

    widgetHost->setPos(presentation.x, presentation.y);

    widgetHost->setZValue(presentation.zValue);

    connectWidget(widgetHost);

    mNewWidgets << widgetHost;

    return true;

}

/*!

    Layouts all the new widgets

*/

void HsPage::layoutNewWidgets()

{

    if (mNewWidgets.isEmpty()) {

        return;

    }

    QString key = HsScene::orientation() == Qt::Horizontal ?

        "landscape" : "portrait";

    QList<QRectF> rects;

    foreach (HsWidgetHost *newWidget, mNewWidgets) {

        rects << newWidget->rect();

    }

    HsWidgetPositioningOnWidgetAdd *algorithm =

        HsWidgetPositioningOnWidgetAdd::instance();

    QList<QRectF> calculatedRects =

        algorithm->convert(HsScene::mainWindow()->layoutRect(), rects, QPointF());

    updateZValues();

    HsWidgetHost *widget = 0;

    for (int i = 0; i < mNewWidgets.count(); ++i) {

        widget = mNewWidgets.at(i);

        widget->setGeometry(calculatedRects.at(i));

        widget->setWidgetPresentation();

        widget->setPage(this);

        widget->setParentItem(this);

        widget->show();

    }

    mWidgets << mNewWidgets;

    mNewWidgets.clear();

}

bool HsPage::deleteFromDatabase()

{

    HsDatabase *db = HsDatabase::instance();

    foreach (HsWidgetHost *widget, mWidgets) {

        if (!widget->deleteFromDatabase()) {

            return false;

        }

    }

    if (!db->deletePage(mDatabaseId))  {

        return false;

    }

    return true;

}

QList<HsWidgetHost *> HsPage::widgets() const

{

    return mWidgets;

}

/*!

    Returns true if the page can be removed. Otherwise,

    returns false.

*/

bool HsPage::isRemovable() const

{

    return mRemovable;

}

/*!

    Sets removable flag to \a removable.

*/

void HsPage::setRemovable(bool removable)

{

    mRemovable = removable;

}

HsPage *HsPage::createInstance(const HsPageData &pageData)

{

    HsDatabase *db = HsDatabase::instance();

    Q_ASSERT(db);

    HsPageData data(pageData);

    if (db->insertPage(data)) {

        HsPage *page = new HsPage;

        page->setDatabaseId(data.id);

        return page;

    }

    return 0;

}

/*!

    Calls onShow() for contained widgets.

*/

void HsPage::showWidgets()

{

    foreach (HsWidgetHost *widget, mWidgets) {

        if (widget->parentItem() == this) {

            widget->showWidget();

        }

    }

}

/*!

    Calls onHide() for contained widgets.

*/

void HsPage::hideWidgets()

{

    foreach (HsWidgetHost *widget, mWidgets) {

        if (widget->parentItem() == this) {

            widget->hideWidget();

        }

    }

}

/*!

    Propogate online state to widgets.

*/

void HsPage::setOnline(bool online)

{

    foreach (HsWidgetHost *widget, mNewWidgets) {

        widget->setOnline(online);

    }

    foreach (HsWidgetHost *widget, mWidgets) {

        widget->setOnline(online);

    }

}

void HsPage::updateZValues()

{

    int z = 0;

    if (!mWidgets.isEmpty()) {

        QMultiMap<qreal, HsWidgetHost *> map;

        foreach (HsWidgetHost *widget, mWidgets) {

            map.insert(widget->zValue(), widget);

        }

        QList<HsWidgetHost *> sortedWidgets = map.values();

        HsWidgetHost *activeWidget = HsScene::instance()->activeWidget();

        if (sortedWidgets.contains(activeWidget)) {

            sortedWidgets.removeOne(activeWidget);

            sortedWidgets.append(activeWidget);

        }

        foreach (HsWidgetHost *widget, sortedWidgets) {

            widget->setZValue(z++);

            widget->setWidgetPresentation();

        }

    }

    if (!mNewWidgets.isEmpty()) {

        foreach (HsWidgetHost *widget, mNewWidgets) {

            widget->setZValue(z++);

            widget->setWidgetPresentation();

        }

    }

}

void HsPage::connectWidget(HsWidgetHost *widget)

{

    connect(widget, SIGNAL(widgetFinished(HsWidgetHost*)),

            SLOT(onWidgetFinished(HsWidgetHost*)));

    connect(widget, SIGNAL(widgetResized(HsWidgetHost*)),

            SLOT(onWidgetResized(HsWidgetHost*)));

}

void HsPage::disconnectWidget(HsWidgetHost *widget)

{

    widget->disconnect(this);

}

void HsPage::onWidgetFinished(HsWidgetHost *widget)

{

    Q_ASSERT(widget);

    // It can be in new widget list if we haven't layouted it yet

    // or layouted new widget and widget list

    if (!mNewWidgets.removeOne(widget)) {

        mWidgets.removeOne(widget);

    }

    disconnectWidget(widget);

    widget->uninitializeWidget();

    widget->deleteFromDatabase();

    widget->deleteLater();

}

/*!

    Calculates new widget position on page when widget size changes

*/

void HsPage::onWidgetResized(HsWidgetHost *widget)

{

    QRectF widgetRect = widget->geometry();

    QRectF pageRect = HsScene::mainWindow()->layoutRect();

    qreal lowerBoundX = 0;

    qreal upperBoundX = pageRect.width() - widgetRect.width() / 2 - 10;

    upperBoundX = pageRect.width() - widgetRect.width();

    qreal widgetX = qBound(lowerBoundX, widgetRect.x(), upperBoundX);

    qreal widgetY = qBound(qreal(64), widgetRect.y(), pageRect.height() - widgetRect.height());

    widget->setPos(widgetX, widgetY);

}