/*
 * 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 <QStandardItemModel>
#include <QStandardItem>
#include <QTranslator>
#include <QSortFilterProxyModel>
#include <QDebug>
#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.
    if(!mThemeListView)
        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()
{
    //qDebug() << "ThemeChangeTimeout " ;
    mIdleTimer->stop();
    QThread::currentThread()->setPriority(QThread::NormalPriority);    
        
}

void CpThemeControl::themeChangeFinished()
{
    //qDebug() << "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);
}