/*
* 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:  Default implementation of the home screen runtime.
*
*/

#include <QState>
#include <QFinalState>
#include <QSignalTransition>
#include <QKeyEventTransition>
#include <QKeyEvent>

#include <qvaluespacepublisher.h>
#include <qservicemanager.h>
#include <qservicefilter.h>
#include <qserviceinterfacedescriptor.h>

#include <HbInstance>
#include <HbIconAnimationManager>
#include <HbIconAnimationDefinition>

#include "homescreendomainpskeys.h"
#include "hsdefaultruntime.h"
#include "hsdatabase.h"
#include "hscontentservice.h"
#include "hsshortcutservice.h"
#include "hsmenueventtransition.h"
#include "hswidgetpositioningonorientationchange.h"
#include "hswidgetpositioningonwidgetadd.h"
#include "hstest_global.h"
#ifdef Q_OS_SYMBIAN
#include "hsbackuprestoreobserver.h"
#endif

QTM_USE_NAMESPACE


#ifdef Q_OS_SYMBIAN
const static Qt::Key applicationKey = Qt::Key_Menu;
#else
const static Qt::Key applicationKey = Qt::Key_Home;
#endif

namespace
{
    const char KHsLoadSceneStateInterface[] = "com.nokia.homescreen.state.HsLoadSceneState";
    const char KHsIdleStateInterface[] = "com.nokia.homescreen.state.HsIdleState";
    const char KHsAppLibraryStateInterface[] = "com.nokia.homescreen.state.HsAppLibraryState";
    const char KHsMenuWorkerStateInterface[] = "com.nokia.homescreen.state.HsMenuWorkerState";
}


/*!
    \class HsDefaultRuntime
    \ingroup group_hsdefaultruntimeplugin
    \brief Default implementation of the home screen runtime.
    Creates an execution context (EC) and populates it with
    runtime services. States are loaded from state plugins.
    Each state is given an access to the EC. States
    are added to a state machine. Finally, the state machine
    is started.
*/

/*!
    Constructs runtime with \a parent as the parent object.
*/
HsDefaultRuntime::HsDefaultRuntime(QObject *parent)
    : QStateMachine(parent),
      mContentService(0),	  
	  mHomeScreenActive(false),
	  mIdleStateActive(false),
	  mPublisher(NULL)
#ifdef Q_OS_SYMBIAN
	  ,keyCapture()
	  ,mBRObserver(NULL)
#endif
{
    HSTEST_FUNC_ENTRY("HS::HsDefaultRuntime::HsDefaultRuntime");

    HsDatabase *db = new HsDatabase;
    db->setConnectionName("homescreen.dbc");
#ifdef Q_OS_SYMBIAN
    db->setDatabaseName("c:/private/20022f35/homescreen.db");
#else
    db->setDatabaseName("private/20022f35/homescreen.db");
#endif    
    db->open();
    HsDatabase::setInstance(db);

    HsWidgetPositioningOnOrientationChange::setInstance(
        new HsAdvancedWidgetPositioningOnOrientationChange);

    HsWidgetPositioningOnWidgetAdd::setInstance(
        new HsAnchorPointInBottomRight);
    
#ifdef Q_OS_SYMBIAN
    mBRObserver = CHsBackupRestoreObserver::NewL();
#endif
    registerAnimations();

    createStatePublisher();
    createContentServiceParts();
    createStates();
    assignServices();
    
	QCoreApplication::instance()->installEventFilter(this);
    HSTEST_FUNC_EXIT("HS::HsDefaultRuntime::HsDefaultRuntime");
}

/*!
    Destructor.
*/
HsDefaultRuntime::~HsDefaultRuntime()
{
    HsWidgetPositioningOnOrientationChange::setInstance(0);
	delete mPublisher;
#ifdef Q_OS_SYMBIAN	
	delete mBRObserver;
#endif
}

/*!
    \fn void HsDefaultRuntime::stopStateMachine()
    Emission of this signal initiates a transition to the final state.
*/

/*!
    \copydoc QObject::eventFilter(QObject *watched, QEvent *event)
*/
bool HsDefaultRuntime::eventFilter(QObject *watched, QEvent *event)
{
    Q_UNUSED(watched);

    switch (event->type()) {
		case QEvent::ApplicationActivate:
            qDebug() << "HsDefaultRuntime::eventFilter: QEvent::ApplicationActivate";
#ifdef Q_OS_SYMBIAN
			keyCapture.captureKey(applicationKey);
#endif
            mHomeScreenActive = true;
            updatePSKeys();
            break;
		case QEvent::ApplicationDeactivate:
            qDebug() << "HsDefaultRuntime::eventFilter: QEvent::ApplicationDeactivate";
#ifdef Q_OS_SYMBIAN
			keyCapture.cancelCaptureKey(applicationKey);
#endif
			mHomeScreenActive = false;
            updatePSKeys();
            break;
        default:
            break;
	}
   
    bool result =  QStateMachine::eventFilter(watched, event);
    // temporary hack as we should not register twice for events
	if (event->type() == QEvent::KeyPress ) {
        QKeyEvent* ke = static_cast<QKeyEvent *>(event);         
        // Key_Launch0 should be removed when QT starts to send Key_Menu
        result = (ke->key() == applicationKey) || ke->key() == Qt::Key_Launch0;        
	}
	return result;
}

/*!
    Registers framework animations.
*/
void HsDefaultRuntime::registerAnimations()
{
    HbIconAnimationManager *manager = HbIconAnimationManager::global();
    manager->addDefinitionFile(QLatin1String(":/resource/tapandhold.axml"));
}

/*!
    Creates Home screen state publisher.
*/
void HsDefaultRuntime::createStatePublisher()
{
    mPublisher = new QValueSpacePublisher(QValueSpace::PermanentLayer, HsStatePSKeyPath);

    if (!mPublisher->isConnected()){
    	// No permanent layer available
    	mPublisher = new QValueSpacePublisher(HsStatePSKeyPath);
    }

    mPublisher->setValue(HsStatePSKeySubPath, EHomeScreenInactive);
}

/*!
    Creates content service parts.
*/
void HsDefaultRuntime::createContentServiceParts()
{
    HSTEST_FUNC_ENTRY("HS::HsDefaultRuntime::createContentServiceParts");

    mContentService = new HsContentService(this);

    HSTEST_FUNC_EXIT("HS::HsDefaultRuntime::createContentServiceParts");
}

/*!
    Creates states.
*/
void HsDefaultRuntime::createStates()
{
    HSTEST_FUNC_ENTRY("HS::HsDefaultRuntime::createStates");

    QFinalState *finalState = new QFinalState();
    addState(finalState);

    QState *guiRootState = new QState();
    addState(guiRootState);

    guiRootState->addTransition(this, SIGNAL(event_exit()), finalState);

    QServiceManager manager;

    
    QObject *loadSceneStateObj = manager.loadInterface(KHsLoadSceneStateInterface);
    QState *loadSceneState = qobject_cast<QState *>(loadSceneStateObj);
    loadSceneState->setParent(guiRootState);
    loadSceneState->setObjectName(KHsLoadSceneStateInterface);

    QObject *idleStateObj = manager.loadInterface(KHsIdleStateInterface);
    QState *idleState = qobject_cast<QState *>(idleStateObj);
    idleState->setParent(guiRootState);
    idleState->setObjectName(KHsIdleStateInterface);
	connect(idleState, SIGNAL(entered()), SLOT(onIdleStateEntered()));
	connect(idleState, SIGNAL(exited()), SLOT(onIdleStateExited()));

    loadSceneState->addTransition(
            loadSceneState, SIGNAL(event_idle()), idleState);

    //menu state
    QState *menuParallelState = new QState(
            QState::ParallelStates, guiRootState);
    QState *menuRootState = new QState(menuParallelState);

    QObject *appLibraryStateObj = manager.loadInterface(KHsAppLibraryStateInterface);
    QState *appLibraryState = qobject_cast<QState *>(appLibraryStateObj);
    appLibraryState->setParent(menuRootState);
    appLibraryState->setObjectName(KHsAppLibraryStateInterface);
    menuRootState->setInitialState(appLibraryState);

    QObject *menuWorkerStateObj = manager.loadInterface(KHsMenuWorkerStateInterface);
    QState *menuWorkerState = qobject_cast<QState *>(menuWorkerStateObj);
    menuWorkerState->setParent(menuParallelState);
    menuWorkerState->setObjectName(KHsMenuWorkerStateInterface);

    // root state transitions
    idleState->addTransition(idleState, SIGNAL(event_applicationLibrary()), menuRootState);
    appLibraryState->addTransition(
            appLibraryState, SIGNAL(toHomescreenState()), idleState);
    // opening shortcut to Application Library
    HsMenuEventTransition *idleToAppLibTransition =
        new HsMenuEventTransition(HsMenuEvent::OpenApplicationLibrary,
                                  idleState, appLibraryState);
    idleState->addTransition(idleToAppLibTransition);

    HsMenuEventTransition *appLibToIdleTransition =
        new HsMenuEventTransition(
            HsMenuEvent::OpenHomeScreen, appLibraryState, idleState);
    appLibraryState->addTransition(appLibToIdleTransition);

    HbMainWindow *window = hbInstance->allMainWindows().first();

    // key driven transition from idle to menu
    QKeyEventTransition *idleToMenuRootTransition =
        new QKeyEventTransition(
                window, QEvent::KeyPress, applicationKey);
    idleToMenuRootTransition->setTargetState(menuRootState);
    idleState->addTransition(idleToMenuRootTransition);
    // key driven transition from menu to idle
    QKeyEventTransition *menuToIdleTransition =
        new QKeyEventTransition(
                window, QEvent::KeyPress, applicationKey);
    menuToIdleTransition->setTargetState(idleState);
    menuRootState->addTransition(menuToIdleTransition);
    
    // transition for Key_Launch0 should be removed 
    // when OT starts to send Key_Menu (maybe wk14)
    QKeyEventTransition *idleToMenuRootTransition2 =
        new QKeyEventTransition(
                window, QEvent::KeyPress, Qt::Key_Launch0);
    idleToMenuRootTransition2->setTargetState(menuRootState);
    idleState->addTransition(idleToMenuRootTransition2);
    // key driven transition from menu to idle
    QKeyEventTransition *menuToIdleTransition2 =
        new QKeyEventTransition(
                window, QEvent::KeyPress, Qt::Key_Launch0);
    menuToIdleTransition2->setTargetState(idleState);
    menuRootState->addTransition(menuToIdleTransition2);

    // transitions to child states
    // opening shortcut to a colleciton
    QList<QState *> collectionStates =
        appLibraryState->
            findChildren<QState *>
                ("homescreen.nokia.com/state/applibrarystate/collectionstate");
    qDebug(
        "Found %d \"collectionstate\" children for Application Library State",
            collectionStates.count());
    if (collectionStates.count()) {
        HsMenuEventTransition *idleToCollectionTransition =
            new HsMenuEventTransition(HsMenuEvent::OpenCollection,
                                      idleState, collectionStates[0]);
        idleState->addTransition(idleToCollectionTransition);
    }

    guiRootState->setInitialState(loadSceneState);
    setInitialState(guiRootState);
    
    HSTEST_FUNC_EXIT("HS::HsDefaultRuntime::createStates");
}

/*!
    Assigns services to states based on value of property HS_SERVICES_REGISTRATION_KEY.
*/
void HsDefaultRuntime::assignServices()
{
    HSTEST_FUNC_ENTRY("HS::HsDefaultRuntime::assignServices");

    QList<QState*> children = findChildren<QState*>();
    foreach (QState *state, children) {
        QList<QVariant> services = state->property(HS_SERVICES_REGISTRATION_KEY).toList();
        foreach (const QVariant &service, services) {
            QString name = service.toString();
            qDebug() << "Assign service:" << name << "\n to " << state->objectName();
            if (name == CONTENT_SERVICE_KEY) {
                state->setProperty(name.toAscii().data(), qVariantFromValue(mContentService));
            } else if (name == SHORTCUT_SERVICE_KEY) {
                state->setProperty(name.toAscii().data(),
                    qVariantFromValue(HsShortcutService::instance(this)));
            } else {
                qWarning() << "WARNING: Service " << name << " is unknown";
            }
        }
    }

    HSTEST_FUNC_EXIT("HS::HsDefaultRuntime::assignServices");
}

/*!
    Publishes Home screen states via Publish & Subscribe.
*/
void HsDefaultRuntime::updatePSKeys()
{	
	if (!mPublisher){
		createStatePublisher();
	}

	if (mHomeScreenActive && mIdleStateActive){
    	qDebug() << "HsDefaultRuntime::updatePSKeys: EHomeScreenIdleState";
    	mPublisher->setValue(HsStatePSKeySubPath, EHomeScreenIdleState);
    }
    else{
    	qDebug() << "HsDefaultRuntime::updatePSKeys: EHomeScreenInactive";
    	mPublisher->setValue(HsStatePSKeySubPath, EHomeScreenInactive);
    }	
}

/*!
    Called when state machine is in Idle state.
*/
void HsDefaultRuntime::onIdleStateEntered()
{
	mIdleStateActive = true;
	updatePSKeys();
}

/*!
    Called when state machine leaves the Idle state.
*/
void HsDefaultRuntime::onIdleStateExited()
{
	mIdleStateActive = false;
	updatePSKeys();
}