/*

 * 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:  

 *   

 */

/*!

    \class CpThemeControl

    \brief CpThemeControl creates and controls two views for Theme Changer plugin and handles

	user interaction to preview and change the themes.

	It creates a list view of the themes.  When a list item is selected, it creates a preview

	of the theme icon using a CpThemePreview class.  

	This class also connects to the theme server using the HbThemeChanger and sets the theme

	based on user interaction with the views.  

 */

#include <QString>

#include <QModelIndex>

#include <QTranslator>

#include <QSortFilterProxyModel>

#include <QThread>

#include <QTimer>

#include <QDesktopServices>

#include <QUrl>

#include <hbmainwindow.h>

#include <hbinstance.h>

#include "cpthemechanger.h"

#include "cpthemecontrol.h"

#include "cpthemelistview.h"

#include "cpthemepreview.h"

#include "cpthemeinfo.h"

#include "cpthemelistmodel.h"

#include <hbdialog.h>

#include <hblabel.h>

/*!

	Helper function to fetch the main window.

*/

static HbMainWindow *mainWindow() 

{

    QList< HbMainWindow* > mainWindows = hbInstance->allMainWindows();

    if (!mainWindows.isEmpty()) {

        return mainWindows.front();

    }

    return 0;

}

/*!

	constructor.

*/

CpThemeControl::CpThemeControl(): mThemeListView(0), 

    mThemePreview(0), 

    mThemeChanger(0),

    mListModel(0),

    mThemeChangeFinished(false),

    mWaitDialog(0)

{

    mThemeChanger = new CpThemeChanger();

    QTranslator *translator = new QTranslator(this);

    QString lang = QLocale::system().name();

    QString path = "Z:/resource/qt/translations/";

    translator->load("control_panel_" + lang, path);

    qApp->installTranslator(translator);

    connect(mThemeChanger,SIGNAL(themeChangeFinished()), this, SLOT(themeChangeFinished()));

}

/*!

	destorys the list view, preview and theme changer objects.

*/

CpThemeControl::~CpThemeControl()

{

    delete mThemeListView;

    mThemeListView = 0;

    delete mThemeChanger;

    mThemeChanger = 0;

    delete mThemePreview;

    mThemePreview = 0;

    delete mWaitDialog;

    mWaitDialog = 0;

}

/*!

	Creates the theme list view.  Gets the themes, creates a model based on

	theme names, icons, and icon paths and sets the list model.

*/

void CpThemeControl::createThemeList()

{

    mThemeListView = new CpThemeListView();

    if(!mListModel) {

        mListModel = new CpThemeListModel(this);

    }

    // Set the model for theme list.

    mThemeListView->setModel(mListModel);

    mThemeListView->themeList()->setSelectionMode(HbAbstractItemView::SingleSelection);

    setActiveThemeIndex();

    //connect to signal for selecting a list item.

	//handle signal for list view closing. (e.g Back softkey pressed)

    connect(mThemeListView,SIGNAL(aboutToClose()),

            this,SLOT(themeListClosed()));

}

/*!

	returns the instance of themelist view.  Used by control panel to set

	the view.  

*/

CpBaseSettingView* CpThemeControl::themeListView()

{

    //If the view was removed before by control panel app, create it again.

    if(!mThemeListView) {

        createThemeList();

    }

    return mThemeListView;

}

/*!

        returns the name of the current theme.

*/

QString CpThemeControl::currentThemeName() const

{

    QString name = "";

    if(mThemeChanger->currentTheme()) {

        name = mThemeChanger->currentTheme()->name();

    }

    return name;

}

/*!

        returns the repersenatative icon of the current theme.

*/

HbIcon CpThemeControl::currentThemeIcon() const

{

    HbIcon icon;

    if(mThemeChanger->currentTheme()) {

        icon = mThemeChanger->currentTheme()->icon();

    }

    return icon;

}

/*!

	Slot called when a list item of the theme list is selected.

*/

void CpThemeControl::newThemeSelected(const QModelIndex& index)

{

    if(!index.isValid()) {

        return;

    }

    CpThemeInfo themeInfo;

    QVariant data;

    //reset the current index to active theme, so that the selection remains on current

    //theme even though another list item is selected.

    setActiveThemeIndex();

    // Figure out whether this is a URI and appropriately delegate

    data = index.data(CpThemeListModel::ItemTypeRole);

    if(data.isValid() && data.canConvert<CpThemeInfo::ThemeListItemType>()) {

        CpThemeInfo::ThemeListItemType type = data.value<CpThemeInfo::ThemeListItemType>();

        switch (type) {

            case CpThemeInfo::ThemeListItemType_URL:

                //get the URL

                data = index.data(CpThemeListModel::ItemDataRole);

                if(data.isValid()) {

                    QString url = data.toString();

                    // Launch the URL in the browser and 

                    // continue to Preview if not successful

                    if (QDesktopServices::openUrl(QUrl(url, QUrl::TolerantMode))) {

                        return;

                    }

                }

                break;

            case CpThemeInfo::ThemeListItemType_APP:

                break;

            default:

                // do nothing

                qt_noop();

        }

    }

    //get the theme name.

    data = index.data(Qt::DisplayRole);

    if(data.isValid()) {

        themeInfo.setName(data.toString());

    }

    //get theme icon.

    data = index.data(Qt::DecorationRole);

    if(data.isValid()) {

        themeInfo.setIcon(data.value<HbIcon>());

    }

    data = index.data(CpThemeListModel::PortraitPreviewRole);

    if(data.isValid()) {

        themeInfo.setPortraitPreviewIcon(data.value<HbIcon>());

    }

    data = index.data(CpThemeListModel::LandscapePreviewRole);

    if(data.isValid()) {

        themeInfo.setLandscapePreviewIcon(data.value<HbIcon>());

    }

   //Set up the theme preview and set it to

    //the current view of main window.

    HbMainWindow*  mWindow = ::mainWindow();

    if(!mThemePreview){

        mThemePreview = new CpThemePreview(themeInfo);

        mWindow->addView(mThemePreview);

        connect(mThemePreview,SIGNAL(aboutToClose()),

            this, SLOT(previewClosed()));

    } else {

        mThemePreview->setThemeInfo(themeInfo);

    }

    mThemePreview->setTitle(hbTrId("txt_cp_title_control_panel"));

    mWindow->setCurrentView(mThemePreview);

}

/*!

	Slot called when a Select key is pressed in theme preview view.

*/

{

    QThread::currentThread()->setPriority(QThread::HighPriority);  

    if(mThemeChanger->changeTheme(theme)) {

        //Start a timer. If theme change takes more than 1 seconds,

        //we will show a dialog (mWaitDialog) until theme change

        //is done (themeChangeFinished is called).

        mThemeChangeFinished = false;

    } else {

        //theme change failed, go back to control panel.

        previewClosed();

        triggerThemeListClose();

    }

}

/*!

	Slot called when the theme preview view is closed.

*/

void CpThemeControl::previewClosed()

{

    //The theme preview closed, go back

    //to theme list view.

    HbMainWindow*  mainWindow = ::mainWindow();

    //reset the current index to active theme, so that the selection remains on current

    //theme even though another list item is selected.

    setActiveThemeIndex();

	mainWindow->setCurrentView(mThemeListView);   

}

/*!

    Slot for when the theme list view is closed. Ownership of the theme list was given to

    control panel, so the class won't delete it.

*/

void CpThemeControl::themeListClosed()

{

    mThemeListView = 0;

    delete mThemePreview;

    mThemePreview = 0;

}

/*!

    asks the theme list view to close.  

*/

void CpThemeControl::triggerThemeListClose()

{

    mThemeListView->closeView();

}

void CpThemeControl::themeChangeTimeout()

{

    //Theme change is finished and idle timer has timed out,

    //so revert back the application priority to normal

    //and go back to control panel view.

    if(mWaitDialog && mWaitDialog->isVisible()) {

        mWaitDialog->hide();

    }

    QThread::currentThread()->setPriority(QThread::NormalPriority); 

}

void CpThemeControl::themeWaitTimeout()

{

    //If after this timeOut, theme change is still in progress,

    //show a processing dialog.

        if(!mWaitDialog) {

            mWaitDialog = new HbDialog();

            mWaitDialog->setDismissPolicy(HbPopup::NoDismiss);

            mWaitDialog->setModal(false);

            mWaitDialog->setTimeout(HbPopup::NoTimeout);

            // Create and set HbLabel as content widget.

            label->setAlignment(Qt::AlignCenter);

            mWaitDialog->setContentWidget(label);

        }

       // as we do not need any signals, calling show() instead of open()

       mWaitDialog->show();

    }

}

void CpThemeControl::themeChangeFinished()

{

    //Theme change is done. Start an idle timer to let the UI

    //finish remaining tasks.

    QTimer::singleShot(0, this, SLOT(themeChangeTimeout()));

    mThemeChangeFinished = true;

    if(mThemeChanger->currentTheme()) {

        emit themeUpdated(mThemeChanger->currentTheme()->name(), mThemeChanger->currentTheme()->icon());

    }

}

/*!

 * Private function that sets the current index of theme list view to indicate

 * the active theme.

 */

void CpThemeControl::setActiveThemeIndex()

{

    //Get the index of current theme.

    CpThemeListModel* themeListModel = dynamic_cast<CpThemeListModel*>(mListModel);

    const CpThemeInfo* currentTheme = mThemeChanger->currentTheme();

    if(themeListModel && currentTheme) {

        QModelIndex sourceIndex = mListModel->index(themeListModel->indexOf(*currentTheme),0);

        //set current index.

        mThemeListView->themeList()->setCurrentIndex(sourceIndex, QItemSelectionModel::SelectCurrent);

    }

}