/*

* 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 <QObject>

#ifdef Q_OS_SYMBIAN

#include <e32cmn.h>

#include <w32std.h>

#include <apgwgnam.h>

#include <apgtask.h>

#include <eikenv.h>

#include <avkondomainpskeys.h>  // keyguard state

#include <hwrmpowerstatesdkpskeys.h> // battery status

#include <UsbWatcherInternalPSKeys.h> // usb status

#include <usbman.h>

#include <usbpersonalityids.h>

#include <QMetaEnum>

#include <QString>

#include <QVariant>

#include <QTimer>

#include <qsymbianevent.h>

#endif // Q_OS_SYMBIAN

#include "cxutils.h"

#include "cxuieventlog.h"

#include "cxuiapplication.h"

#include "cxesettings.h"

#include "cxuiapplicationframeworkmonitorprivate.h"

    const int CXUI_USB_MODE_CHECK_TIMER_DELAY = 1000; // 1 second

#ifdef Q_OS_SYMBIAN

    inline QString convertTDesC2QString(const TDesC& aDescriptor)

    {

        #ifdef QT_NO_UNICODE

            return QString::fromLocal8Bit(aDescriptor.Ptr(), aDescriptor.Length());

        #else

            return QString::fromUtf16(aDescriptor.Ptr(), aDescriptor.Length());

        #endif

    }

    inline QString windowGroupName(RWsSession& ws, int id)

    {

        TBuf<CApaWindowGroupName::EMaxLength> name;

        ws.GetWindowGroupNameFromIdentifier(id, name);

        // Window group name contains "null" characters,

        // which are considered end-of-string if not replaced.

        for (int i=0; i < name.Length(); i++) {

            if (name[i] == NULL) {

                name[i] = ' ';

            }

        }

        return convertTDesC2QString(name);

    }

    // Phone ui

    static const unsigned int UID_PHONEUI         = 0x100058B3;

    // Task switcher

    static const unsigned int UID_TASKSWITCHER    = 0x2002677D;

    // Dialog server

    static const unsigned int UID_DIALOGAPPSERVER = 0x20022FC5;

    // Log event types

    static const char *EVENT_USB        = "usb";

    static const char *EVENT_FOREGROUND = "foreground";

#endif // Q_OS_SYMBIAN

/*!

* Constructor

*/

CxuiApplicationFrameworkMonitorPrivate::CxuiApplicationFrameworkMonitorPrivate(CxuiApplicationFrameworkMonitor *parent,

                                                                               CxuiApplication &application,

                                                                               CxeSettings& settings)

    :  q(parent),

       mApplication(application),

       mSettings(settings),

#ifdef Q_OS_SYMBIAN

       mWsSession(CCoeEnv::Static()->WsSession()),

       mWindowGroup(CCoeEnv::Static()->RootWin()),

       mWindowGroupId(mWindowGroup.Identifier()),

       mWindowGroupName(),

       mKeyLockState(EKeyguardNotActive),

       mBatteryStatus(EBatteryStatusUnknown),

       mUsbPersonality(0),

       mUsbModeCheckTimer(this),

       mEventLog(NULL),

#endif // Q_OS_SYMBIAN

       mState(CxuiApplicationFrameworkMonitor::ForegroundOwned)

{

    CX_DEBUG_ENTER_FUNCTION();

#ifdef Q_OS_SYMBIAN

    mWindowGroup.EnableFocusChangeEvents();

    mWindowGroupName = windowGroupName(mWsSession, mWindowGroupId);

    mEventLog = new CxuiEventLog("CxuiApplicationFrameworkMonitorPrivate");

    init();

    mUsbModeCheckTimer.setSingleShot(true);

    mUsbModeCheckTimer.setInterval(CXUI_USB_MODE_CHECK_TIMER_DELAY);

    connect(&mUsbModeCheckTimer, SIGNAL(timeout()),

            this, SLOT(usbModeCheckTimerCallback()));

#endif // Q_OS_SYMBIAN

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Destructor

*/

CxuiApplicationFrameworkMonitorPrivate::~CxuiApplicationFrameworkMonitorPrivate()

{

    CX_DEBUG_ENTER_FUNCTION();

#ifdef Q_OS_SYMBIAN

    delete mEventLog;

#endif // Q_OS_SYMBIAN

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Current foreground owning state of this application.

* @return Foreground owning state.

*/

CxuiApplicationFrameworkMonitor::ForegroundState CxuiApplicationFrameworkMonitorPrivate::foregroundState() const

{

    return mState;

}

/*!

* Is USB connected in mass memory mode?

* @return True if USB mass memory mode is active and connected, false otherwise.

*/

bool CxuiApplicationFrameworkMonitorPrivate::isUsbMassMemoryModeActive() const

{

    bool active(false);

#ifdef Q_OS_SYMBIAN

    // Mass memory mode activity can be seen from the KUsbWatcherSelectedPersonality property.

    // When USB is connected in Mass Memory Mode, we get KUsbPersonalityIdMS as personality id.

    // If USB is not connected, personality id is KUsbWatcherSelectedPersonalityNone.

    active = (mUsbPersonality == KUsbPersonalityIdMS);

#endif // Q_OS_SYMBIAN

    return active;

}

#ifdef Q_OS_SYMBIAN

/*!

* Slot to handle Symbian event.

* @param event Symbian event to be handled. (Ownership not taken.)

*/

void CxuiApplicationFrameworkMonitorPrivate::handleEvent(const QSymbianEvent *event)

{

    // We receive tons of these events, so function start and end traces

    // are intentionally left out.

    if (event) {

        switch (event->type()) {

        case QSymbianEvent::WindowServerEvent:

            handleWindowServerEvent(event);

            break;

        }

    }

}

/*!

* Handle changes in RProperty values of keylock state and battery status.

* @param uid Category uid of the changed property.

* @param key Integer key of the changed property.

* @param value New value of the changed property.

*/

void CxuiApplicationFrameworkMonitorPrivate::handlePropertyEvent(long int uid, unsigned long int key, QVariant value)

{

    CX_DEBUG_ENTER_FUNCTION();

    if (uid == KPSUidAvkonDomain.iUid && key == KAknKeyguardStatus) {

        CX_DEBUG(("CxuiApplicationFrameworkMonitor - keylock status changed: %d -> %d", mKeyLockState, value.toInt()));

        // Check if the keylock value has actually changed

        const int newKeyLockState = value.toInt();

        if (newKeyLockState != mKeyLockState) {

            mKeyLockState = newKeyLockState;

            // Set foreground state based on keylock status and focused application info.

            setState(getCurrentState());

        }

    } else if (uid == KPSUidHWRMPowerState.iUid && key == KHWRMBatteryStatus ) {

        CX_DEBUG(("CxuiApplicationFrameworkMonitor - battery status changed: %d -> %d", mBatteryStatus, value.toInt() ));

        // If status changed, check if battery is going empty.

        const int newBatteryStatus = value.toInt();

        if (newBatteryStatus != mBatteryStatus) {

            mBatteryStatus = newBatteryStatus;

            // Notify that battery is almost empty,

            // need to stop any recordings etc.

            if(mBatteryStatus == EBatteryStatusEmpty) {

                emit q->batteryEmpty();

            }

        }

    } else if (uid == KPSUidUsbWatcher.iUid && key == KUsbWatcherSelectedPersonality) {

        CX_DEBUG(("CxuiApplicationFrameworkMonitor - usb personality changed: %d -> %d", mUsbPersonality, value.toInt()));

        const int newUsbPersonality(value.toInt());

        if (newUsbPersonality != mUsbPersonality) {

            // Check before saving the new state if mass memory mode was active,

            // so we know when to emit the unactivated signal.

            const bool wasUsbMassMemoryModeActive(isUsbMassMemoryModeActive());

            // Store new state.

            mUsbPersonality = newUsbPersonality;

            // Save state to log.

            if (mEventLog) {

                mEventLog->append(EVENT_USB, QString::number(mUsbPersonality));

            }

            // Check if mass memory mode activity changed.

            if (wasUsbMassMemoryModeActive != isUsbMassMemoryModeActive()) {

                // If the massmemory mode switched from on to off,

                // the signal is emitted immediately.

                // If the switch is from off to on, we need to use a timer

                // as a workaround because  plugging in the USB charger

                // sends a mass memory mode change event.

                if (wasUsbMassMemoryModeActive) {

                    emit q->usbMassMemoryModeToggled(isUsbMassMemoryModeActive());

                } else {

                    // (Re)starting the timer

                    mUsbModeCheckTimer.stop();

                    mUsbModeCheckTimer.start();

                }

            }

        }

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

*  Callback function for the timer used to seperate USB charging

*  from USB mass memory mode

*/

void CxuiApplicationFrameworkMonitorPrivate::usbModeCheckTimerCallback()

{

    CX_DEBUG_ENTER_FUNCTION();

    // if the device is still in mass memory mode after the timer has finished,

    // the device really is in massmemory mode and not plugged into the charger

    if (isUsbMassMemoryModeActive()){

        emit q->usbMassMemoryModeToggled(isUsbMassMemoryModeActive());

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Set initial values.

*/

void CxuiApplicationFrameworkMonitorPrivate::init()

{

    CX_DEBUG_ENTER_FUNCTION();

    // Connect to application (window server) events.

    connect(&mApplication, SIGNAL(symbianEvent(const QSymbianEvent *)), this, SLOT(handleEvent(const QSymbianEvent *)));

    QVariant value;

    // Get initial battery status.

    mSettings.get(KPSUidHWRMPowerState.iUid, KHWRMBatteryStatus, Cxe::PublishAndSubscribe, value);

    mBatteryStatus = value.toInt();

    // Get initial keylock status.

    mSettings.get(KPSUidAvkonDomain.iUid, KAknKeyguardStatus, Cxe::PublishAndSubscribe, value);

    mKeyLockState = value.toInt();

    // Get current USB personality

    mSettings.get(KPSUidUsbWatcher.iUid, KUsbWatcherSelectedPersonality, Cxe::PublishAndSubscribe, value);

    mUsbPersonality = value.toInt();

    bool ok = connect(&mSettings, SIGNAL(settingValueChanged(long int, unsigned long int, QVariant)),

                      this, SLOT(handlePropertyEvent(long int, unsigned long int, QVariant)));

    CX_DEBUG_ASSERT(ok);

    // Get foreground state. Depends on keyguard status, so that needs to be read first.

    mState = getCurrentState();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Helper method to handle Symbian event that specificly is of type QSymbianEvent::WindowServerEvent.

* @param event Symbian event to be handled. (Ownership not taken.)

*/

void CxuiApplicationFrameworkMonitorPrivate::handleWindowServerEvent(const QSymbianEvent *event)

    {

    // We receive tons of these events, so function start and end traces

    // are intentionally left out.

    const TWsEvent *wsEvent = event->windowServerEvent();

    if (wsEvent) {

        switch (wsEvent->Type()) {

        case EEventFocusGroupChanged: {

            CX_DEBUG(("CxuiApplicationFrameworkMonitor - EEventFocusGroupChanged event"));

            setState(getCurrentState());

            break;

        }

        case EEventFocusGained: {

            CX_DEBUG(("CxuiApplicationFrameworkMonitor - EEventFocusGained event"));

            setState(getCurrentState());

            break;

        }

        case EEventFocusLost: {

            CX_DEBUG(("CxuiApplicationFrameworkMonitor - EEventFocusLost event"));

            setState(getCurrentState());

            break;

        }

        default:

            break;

        }

    }

}

/*!

* Set state and emit signal if state really changes.

* @param state New state.

*/

void CxuiApplicationFrameworkMonitorPrivate::setState(CxuiApplicationFrameworkMonitor::ForegroundState state)

{

    if (mState != state) {

        const CxuiApplicationFrameworkMonitor::ForegroundState original(mState);

        // Check if state transition is acceptable in current state.

        switch (mState) {

        case CxuiApplicationFrameworkMonitor::ForegroundOwned:

        case CxuiApplicationFrameworkMonitor::ForegroundPartiallyLost:

            // All changes accepted.

            mState = state;

            break;

        case CxuiApplicationFrameworkMonitor::ForegroundFullyLost:

            // If foreground application is changed to note when we are already

            // fully in background, cannot accept state change to "partial foreground".

            if (state != CxuiApplicationFrameworkMonitor::ForegroundPartiallyLost) {

                mState = state;

            } else {

                CX_DEBUG(("CxuiApplicationFrameworkMonitor - state change full bg -> partial bg ignored"));

            }

        }

        if (mState != original) {

            // Print the event log with this foreground event included.

            if (mEventLog) {

                mEventLog->append(

                    EVENT_FOREGROUND,

                    CxuiApplicationFrameworkMonitor::staticMetaObject.enumerator(

                        CxuiApplicationFrameworkMonitor::staticMetaObject.indexOfEnumerator("ForegroundState")).valueToKey(mState));

                mEventLog->print();

            }

        }

    }

}

/*!

* Get the current foreground state.

* @return Current state for foreground ownership.

*/

CxuiApplicationFrameworkMonitor::ForegroundState CxuiApplicationFrameworkMonitorPrivate::getCurrentState()

{

    CX_DEBUG_ENTER_FUNCTION();

    CxuiApplicationFrameworkMonitor::ForegroundState state(CxuiApplicationFrameworkMonitor::ForegroundOwned);

    int focusWindowGroupId(mWsSession.GetFocusWindowGroup());

    if (mKeyLockState != EKeyguardNotActive) {

        // Keylock enabled is the same as if other application is in foreground.

        CX_DEBUG(("CxuiApplicationFrameworkMonitor - key lock on"));

        state = CxuiApplicationFrameworkMonitor::ForegroundFullyLost;

    } else if (focusWindowGroupId == mWindowGroupId) {

        // If our window group has focus, we clearly are the foreground owning application.

        CX_DEBUG(("CxuiApplicationFrameworkMonitor - Foreground window group matches ours."));

        state = CxuiApplicationFrameworkMonitor::ForegroundOwned;

    } else {

        // Need to check if foreground is owned by known apps.

        unsigned int uid(focusedApplicationUid());

        // Check the app uid.

        switch (uid) {

        case UID_TASKSWITCHER:

        case UID_DIALOGAPPSERVER:

            // Note or task switcher in foreground.

            state = CxuiApplicationFrameworkMonitor::ForegroundPartiallyLost;

            break;

        case UID_PHONEUI:

        default:

            // Foreground owned by other app.

            state = CxuiApplicationFrameworkMonitor::ForegroundFullyLost;

            break;

        }

    }

    CX_DEBUG_EXIT_FUNCTION();

    return state;

}

/*!

* Get the uid of application in foreground.

* @return Application uid for the foreground application.

*/

unsigned int CxuiApplicationFrameworkMonitorPrivate::focusedApplicationUid()

{

    unsigned int uid(0);

    int focusWgId(mWsSession.GetFocusWindowGroup());

    TRAP_IGNORE({

        CApaWindowGroupName* wgn = CApaWindowGroupName::NewLC(mWsSession, focusWgId);

        uid = wgn->AppUid().iUid;

        CleanupStack::PopAndDestroy(wgn);

    });

    // If the window group identifier does not have the application uid set,

    // get it via thread secure id.

    if (uid == 0) {

        TApaTask task(mWsSession);

        task.SetWgId(focusWgId);

        RThread t;

        int err = t.Open(task.ThreadId());

        if (err == KErrNone) {

            uid = t.SecureId().iId;

            CX_DEBUG(("CxuiApplicationFrameworkMonitor - uid resolved from thread"));

        }

        t.Close();

    }

#ifdef CX_DEBUG

    QString name(windowGroupName(mWsSession, focusWgId));

    CX_DEBUG(("CxuiApplicationFrameworkMonitor - Own window group id:     0x%08x", mWindowGroupId));

    CX_DEBUG(("CxuiApplicationFrameworkMonitor - Focused window group id: 0x%08x", focusWgId));

    CX_DEBUG(("CxuiApplicationFrameworkMonitor - Own window group name:        [%s]", mWindowGroupName.toAscii().constData()));

    CX_DEBUG(("CxuiApplicationFrameworkMonitor - Focused window group name:    [%s]", name.toAscii().constData()));

    CX_DEBUG(("CxuiApplicationFrameworkMonitor - Focused application uid: 0x%08x", uid));

#endif

    return uid;

}

#endif // Q_OS_SYMBIAN

// end of file