/*

 * 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 <hbmainwindow.h>

#include <hbinstance.h>

#include "cpthemechanger.h"

#include "cpthemecontrol.h"

#include "cpthemelistview.h"

#include "cpthemepreview.h"

static const QString KPlaceholderPreview = ":/image/themePreview.svg";

/*!

	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),

    mSortModel(0),

    mIdleTimer(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);

    mIdleTimer = new QTimer(this);

    connect(mIdleTimer, SIGNAL(timeout()), this, SLOT(themeChangeTimeout()));

    connect(hbInstance->theme(),SIGNAL(changeFinished()), 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;

}

/*!

	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();

    mListModel = &mThemeChanger->model();

    mSortModel = new QSortFilterProxyModel(this);

    mSortModel->setDynamicSortFilter(true);

    mSortModel->setSortCaseSensitivity(Qt::CaseInsensitive);

    mSortModel->sort(0);

    mSortModel->setSourceModel(mListModel);

    // Set the model for theme list.

    mThemeListView->setModel(mSortModel);

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

    setActiveThemeIndex();

    //connect to signal for selecting a list item.

    connect(mThemeListView,SIGNAL(newThemeSelected(const QModelIndex&)),

            this,SLOT(newThemeSelected(const QModelIndex&)));

	//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.

        createThemeList();

    return mThemeListView;

}

/*!

        returns the name of the current theme.

*/

QString CpThemeControl::currentThemeName() const

{

    return mThemeChanger->currentTheme().name;

}

/*!

        returns the repersenatative icon of the current theme.

*/

HbIcon CpThemeControl::currentThemeIcon() const

{

    return mThemeChanger->currentTheme().icon;

}

/*!

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

*/

void CpThemeControl::newThemeSelected(const QModelIndex& index)

{

    if(!index.isValid()) {

        return;

    }

    CpThemeChanger::ThemeInfo 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();

    //get the theme name.

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

    if(data.isValid()) {

        themeInfo.name = data.toString();

    }

    //get theme icon.

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

    if(data.isValid()) {

        themeInfo.icon = data.value<HbIcon>();

    }

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

    if(data.isValid()) {

        themeInfo.portraitPreviewIcon = data.value<HbIcon>();

    }

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

    if(data.isValid()) {

        themeInfo.landscapePreviewIcon = 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()));

        connect(mThemePreview, SIGNAL(applyTheme(const QString&)),

                this, SLOT(themeApplied(const QString&)));

    } else {

        mThemePreview->setThemeInfo(themeInfo);

    }

    //TODO: use qtTrId(text_id).

    mThemePreview->setTitle(tr("Control Panel"));

    mWindow->setCurrentView(mThemePreview);

}

/*!

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

*/

void CpThemeControl::themeApplied(const QString& theme)

{

    bool success = false;

    success = mThemeChanger->connectToServer();

    if (success) {

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

        mThemeChanger->changeTheme(theme);

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

    }

    //Go back to control panel view. Close theme preview.

    previewClosed();

    //ask the themelistview to close.  Control Panel will

    //take care of removing it from window.

    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();

	mainWindow->removeView(mThemePreview);

    mThemePreview->deleteLater();

    mThemePreview = 0;

    //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()

{

    mIdleTimer->stop();

}

void CpThemeControl::themeChangeFinished()

{

    mIdleTimer->start(0);

}

/*!

 * 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.

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

    //Map it to the sort model index.

    QModelIndex sortedIndex = mSortModel->mapFromSource(sourceIndex);

    //set current index.

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

}