/*

* Copyright (c) 2009-2010 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:

*

*/

#include <QDebug>

#include <QTimer>

#include <hbmainwindow.h>

#include <QGraphicsSceneEvent>

#include <hbstyleloader.h>

#include <hbaction.h>

#include <xqserviceutil.h>

#include "cxuiapplication.h"

#include "cxuiapplicationstate.h"

#include "cxuiviewmanager.h"

#include "cxuivideoprecaptureview.h"

#include "cxuistillprecaptureview.h"

#include "cxuipostcaptureview.h"

#include "cxuicapturekeyhandler.h"

#include "cxeengine.h"

#include "cxecameradevicecontrol.h"

#include "cxefeaturemanager.h" //  mEngine->featureManager()

#include "cxeviewfindercontrol.h"

#include "cxenamespace.h"

#include "cxuienums.h"

#include "cxutils.h"

#include "cxuidocumentloader.h"

#include "cxesettings.h"

#include "cxememorymonitor.h"

#include "cxuiserviceprovider.h"

#include "cxuiscenemodeview.h"

#ifdef Q_OS_SYMBIAN

#include "OstTraceDefinitions.h"

#ifdef OST_TRACE_COMPILER_IN_USE

#include "cxuiviewmanagerTraces.h"

#endif

#endif //Q_OS_SYMBIAN

using namespace Cxe;

using namespace CxUiLayout;

namespace

{

    static const int CXUI_STANDBY_CAMERA_TIMEOUT = 60000; // 60 seconds

}

/*!

* Constructor.

*/

CxuiViewManager::CxuiViewManager(CxuiApplication &application, HbMainWindow &mainWindow, CxeEngine &engine) :

    mApplication(application),

    mMainWindow(mainWindow),

    mEngine(engine),

    mKeyHandler(NULL),

    mCameraDocumentLoader(NULL),

    mApplicationState(NULL),

    mErrorManager(NULL)

{

    CX_DEBUG_ENTER_FUNCTION();

    // create mappings to map view name to correct docml file

    mDocmlFilesByView.insert(STILL_PRE_CAPTURE_VIEW, STILL_1ST_XML);

    mDocmlFilesByView.insert(VIDEO_PRE_CAPTURE_VIEW, VIDEO_1ST_XML);

    mDocmlFilesByView.insert(POSTCAPTURE_VIEW, POSTCAPTURE_XML);

    mDocmlFilesByView.insert(SCENE_MODE_VIEW, SCENEMODE_SETTING_XML);

    // Key handler

    mKeyHandler = new CxuiCaptureKeyHandler(mEngine);

    // Document loader

    OstTrace0(camerax_performance, CXUIVIEWMANAGER_CXUIVIEWMANAGER_1, "msg: e_CX_VIEWMANAGER_CREATE_DOCLOADER 1");

    mCameraDocumentLoader = new CxuiDocumentLoader(&engine);

    OstTrace0(camerax_performance, CXUIVIEWMANAGER_CXUIVIEWMANAGER_2, "msg: e_CX_VIEWMANAGER_CREATE_DOCLOADER 0");

    // Application state

    mApplicationState = new CxuiApplicationState(mApplication, mEngine.settings(), mCameraDocumentLoader);

    CX_ASSERT_ALWAYS(mApplicationState);

    bool ok = connect(mApplicationState, SIGNAL(stateChanged(CxuiApplicationState::State, CxuiApplicationState::State)),

                      this, SLOT(handleApplicationStateChanged(CxuiApplicationState::State, CxuiApplicationState::State)));

    Q_ASSERT_X(ok, "CxuiViewManager", "Application state change signal connect failed.");

    connect(this, SIGNAL(standbyExitRequested()), mApplicationState, SLOT(exitStandby()), Qt::QueuedConnection);

    // Standby timer

    mStandbyTimer.setInterval(CXUI_STANDBY_CAMERA_TIMEOUT);

    mStandbyTimer.setSingleShot(true);

    connect(&mStandbyTimer, SIGNAL(timeout()), mApplicationState, SLOT(enterStandby()));

    // Filter capture and AF keys and follow user activity from mouse events.

    QCoreApplication::instance()->installEventFilter(this);

    // Monitor memory on normal state, not on standby, error or background.

    connect(this, SIGNAL(normalStateEntered()), &mEngine.memoryMonitor(), SLOT(startMonitoring()));

    connect(this, SIGNAL(normalStateExited()), &mEngine.memoryMonitor(), SLOT(stopMonitoring()));

    //connecting initmode signals

    connect(&mEngine.cameraDeviceControl(), SIGNAL(initModeComplete(CxeError::Id)),

            mApplicationState, SLOT(handleApplicationError(CxeError::Id)));

    connect(&mEngine.stillCaptureControl(), SIGNAL(imageCaptured(CxeError::Id, int)),

            mApplicationState, SLOT(handleApplicationError(CxeError::Id)));

    // Register stylesheet. It will be automatically destroyed on application

    // exit.

    HbStyleLoader::registerFilePath(":/camerax/cxui.css");

    // Create the view we are starting in, or connect signals so it

    // will be created once we know the mode we are starting to.

    initStartupView();

    // For UI startup testing, we need to emit applicationReady signal once UI is ready to be used.

    connect(mMainWindow.currentView(), SIGNAL(viewReady()), &mApplication, SIGNAL(applicationReady()));

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Destructor.

*/

CxuiViewManager::~CxuiViewManager()

{

    CX_DEBUG_ENTER_FUNCTION();

    QCoreApplication::instance()->removeEventFilter(this);

    if (!CxuiServiceProvider::isCameraEmbedded()) {

        currentView()->saveActivity();

    }

    delete mApplicationState;

    delete mCameraDocumentLoader;

    delete mKeyHandler;

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Handle change in overall state of application.

* @param newState The new application state.

*/

void CxuiViewManager::handleApplicationStateChanged(CxuiApplicationState::State newState,

                                                    CxuiApplicationState::State oldState)

{

    Q_UNUSED(oldState);

    CX_DEBUG_ENTER_FUNCTION();

    CxuiView *view = currentView();

    CX_DEBUG(("CxuiViewManager - current view %d", view));

    switch (newState) {

    case CxuiApplicationState::Normal:

        // If camera is in embedded mode, we need to start

        // listening to key events again

        if (CxuiServiceProvider::isCameraEmbedded()){

            mKeyHandler->startListeningKeys();

        } else {

            // If in standalone mode, we disable raising to

            // foreground with capture key.

            disconnect(mKeyHandler, SIGNAL(captureKeyPressed()),

                       this, SLOT(toForeground()));

        }

        connectSignals(view);

        CX_DEBUG(("CxuiViewManager - emitting normalStateEntered"));

        emit normalStateEntered();

        break;

    case CxuiApplicationState::Standby:

         if (view && !view->isStandbyModeSupported()) {

            // If we move to Stanby, and current view does not

            // support standby mode, move to Normal mode right away.

            CX_DEBUG(("CxuiViewManager - view does not support stanbdy, exiting standby right away.."));

            mApplicationState->exitStandby();

        } else {

            handleExitingNormalState();

        }

        break;

    case CxuiApplicationState::Error:

    case CxuiApplicationState::Background:

        handleExitingNormalState();

        if (newState == CxuiApplicationState::Background) {

            // Moved to background.

            // If we're in embedded mode, we should stop listening to camera key

            // events

            if (CxuiServiceProvider::isCameraEmbedded()){

                mKeyHandler->stopListeningKeys();

            } else {

                // If not in embedded mode, then we bring application back to

                // foreground by capture key press

                connect(mKeyHandler, SIGNAL(captureKeyPressed()),

                        this, SLOT(toForeground()));

            }

        }

        break;

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Helper method to handle (possible) exiting from normal state.

* @param oldState The previous state.

*/

void CxuiViewManager::handleExitingNormalState()

{

    CX_DEBUG_ENTER_FUNCTION();

    // Store view that is active now.

    CxuiView *view = currentView();

    CX_DEBUG(("CxuiViewManager - current view %d", view));

    // Emit signal so current view can enter standby.

    emit normalStateExited();

    // Disconnect signals so we don't send key event's etc.

    // Using the view before normalStateExited() signal was emitted,

    // just in case it caused view switch.

    disconnectSignals(view);

    // Make sure standby timer is not running.

    stopStandbyTimer();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Slot for starting standby timer.

*/

void CxuiViewManager::startStandbyTimer()

{

    CX_DEBUG_ENTER_FUNCTION();

    mStandbyTimer.start();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Slot for stopping standby timer.

*/

void CxuiViewManager::stopStandbyTimer()

{

    CX_DEBUG_ENTER_FUNCTION();

    mStandbyTimer.stop();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

 * Helper function to return current view cast to CxuiView.

 */

CxuiView* CxuiViewManager::currentView() const

{

    CxuiView *view = qobject_cast<CxuiView*> (mMainWindow.currentView());

    return view;

}

/*!

* Select and initialize the view we need to start into.

*/

void CxuiViewManager::initStartupView()

{

    CX_DEBUG_ENTER_FUNCTION();

        // @todo: There's a bug in orbit and we never get Hb::ActivationReasonService as

        // activation reason. Use XQServiceUtil to determine if starting service as

        // a workaround for now

        XQServiceUtil::isService()) {

        // For embedded mode: don't create view yet, create when engine inits to correct mode.

        // Connect signals to set up the view after image/video prepare

        connect(&mEngine.stillCaptureControl(), SIGNAL(imagePrepareComplete(CxeError::Id)),

                this, SLOT(changeToPrecaptureView()));

        connect(&mEngine.videoCaptureControl(), SIGNAL(videoPrepareComplete(CxeError::Id)),

                this, SLOT(changeToPrecaptureView()));

        // restoring activity, read startup view from stored activity

        // view to start in

        QString viewName = STILL_PRE_CAPTURE_VIEW;

        bool preCapture = true;

        if (activityId == CxuiActivityIds::STILL_PRECAPTURE_ACTIVITY) {

            viewName = STILL_PRE_CAPTURE_VIEW;

        } else if (activityId == CxuiActivityIds::STILL_POSTCAPTURE_ACTIVITY) {

            viewName = POSTCAPTURE_VIEW;

            preCapture = false;

        } else if (activityId == CxuiActivityIds::VIDEO_PRECAPTURE_ACTIVITY) {

            viewName = VIDEO_PRE_CAPTURE_VIEW;

        } else if (activityId == CxuiActivityIds::VIDEO_POSTCAPTURE_ACTIVITY) {

            viewName = POSTCAPTURE_VIEW;

            preCapture = false;

        }

        CxuiView *view = createView(viewName);

        if (preCapture) {

            connectPreCaptureSignals(static_cast<CxuiPrecaptureView *>(view));

        } else {

            connectPostCaptureSignals();

        }

        mMainWindow.setCurrentView(view, false);

        // restore view from activity

        clearAllActivities();

    } else {

        // normal start

        // no activity id, get default view from engine state

        CxuiView *view = NULL;

        if (mEngine.mode() == Cxe::VideoMode) {

            view = createView(VIDEO_PRE_CAPTURE_VIEW);

        } else {

            view = createView(STILL_PRE_CAPTURE_VIEW);

        }

        connectPreCaptureSignals(static_cast<CxuiPrecaptureView *>(view));

        mMainWindow.setCurrentView(view, false);

        clearAllActivities();

    }

    // Check the current application state, signalled to handleApplicationStateChanged.

    mApplicationState->startMonitoring();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Create view and add it to main window.

*/

CxuiView* CxuiViewManager::createView(const QString &viewName)

{

    CX_DEBUG_ENTER_FUNCTION();

    OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_IN, "msg: e_CX_CREATE_VIEW 1");

    CX_DEBUG(("View name: %s", viewName.toAscii().data()));

    CxuiView* view = mViews[viewName];

    if (view == NULL) {

        CX_DEBUG(("View not loaded yet, loading now"));

        bool ok = false;

        // Use document loader to create widgets and layouts

        // (non-sectioned parts are parsed and loaded)

        QString docmlFile = mDocmlFilesByView[viewName];

        CX_ASSERT_ALWAYS(mCameraDocumentLoader);

        CX_ASSERT_ALWAYS(!docmlFile.isNull());

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_2, "msg: e_CX_DOCUMENTLOADER_LOAD 1");

        mCameraDocumentLoader->load(docmlFile, &ok);

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_4, "msg: e_CX_DOCUMENTLOADER_LOAD 0");

        Q_ASSERT_X(ok, "createView", "error in xml file parsing");

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_6, "msg: e_CX_DOCUMENTLOADER_FINDWIDGET 1");

        QGraphicsWidget *widget = NULL;

        // ask for the view widget pointer

        widget = mCameraDocumentLoader->findWidget(viewName);

        view = qobject_cast<CxuiView *> (widget);

        CX_ASSERT_ALWAYS(view);

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_8, "msg: e_CX_DOCUMENTLOADER_FINDWIDGET 1");

        // call for needed consturction methods

        // .. and add to main window (which also takes ownership)

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_10, "msg: e_CX_MAINWINDOW_ADDVIEW 1");

        mMainWindow.addView(view);

        mViews.insert(viewName, view);

        OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_12, "msg: e_CX_MAINWINDOW_ADDVIEW 0");

    }

    OstTrace0(camerax_performance, CXUIVIEWMANAGER_CREATEVIEW_OUT, "msg: e_CX_CREATE_VIEW 0");

    CX_DEBUG_EXIT_FUNCTION();

    return view;

}

/*!

* CxuiViewManager::showScenesView

* A private method for displaying Scene Modes selection view

*/

void CxuiViewManager::showScenesView()

{

    CX_DEBUG_ENTER_FUNCTION();

    // Disconnect signals from old view.

    disconnectSignals();

    CxuiSceneModeView *view = qobject_cast<CxuiSceneModeView*>(createView(SCENE_MODE_VIEW));

    CX_ASSERT_ALWAYS(view);

    view->loadBackgroundImages();

    stopStandbyTimer();

    connectSceneModeSignals();

    mMainWindow.setCurrentView(view, false);

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Get the precapture view appropriate for given camera mode and index.

* If the view does not exist, it is created.

* @param mode Which camera mode the view should match.

* @param index Which camera index the view should match.

*/

CxuiPrecaptureView*

CxuiViewManager::getPrecaptureView(Cxe::CameraMode mode, Cxe::CameraIndex camera)

{

    CX_DEBUG_ENTER_FUNCTION();

    CX_DEBUG(("CxuiViewManager::getPrecaptureView - mode=%d, camera index=%d", mode, camera));

    CX_DEBUG_ASSERT(camera == Cxe::PrimaryCameraIndex);

    if (mode == ImageMode) {

        CX_DEBUG(("CxuiViewManager::getPrecaptureView - image mode"));

        return qobject_cast<CxuiPrecaptureView*>(createView(STILL_PRE_CAPTURE_VIEW));

    } else {

        CX_DEBUG(("CxuiViewManager::getPrecaptureView - video mode"));

        return qobject_cast<CxuiPrecaptureView*>(createView(VIDEO_PRE_CAPTURE_VIEW));

    }

}

/*!

* Move to post-capture view.

*/

void CxuiViewManager::changeToPostcaptureView()

{

    CX_DEBUG_ENTER_FUNCTION();

    // Disconnect signals from old view.

    disconnectSignals();

    CxuiView *postCaptureView = createView(POSTCAPTURE_VIEW);

    // Connecting all necessary signals for postcapture view.

    // Not connected yet if not in normal state. We connect the signals

    // once we enter normal state again.

    if (mApplicationState->currentState() == CxuiApplicationState::Normal) {

        connectPostCaptureSignals();

    }

    // Connect signals before we set the post-capture view as current view.

    // We need to have signals connected if post-capture view for example

    // needs to move back to pre-capture view already in showEvent.

    mMainWindow.setCurrentView(postCaptureView, false);

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Move to pre-capture view.

*/

void CxuiViewManager::changeToPrecaptureView()

{

    CX_DEBUG_ENTER_FUNCTION();

    if (CxuiServiceProvider::isCameraEmbedded()) {

        // disconnect signals, we only want to call this once after the initial prepare

        disconnect(&mEngine.stillCaptureControl(), SIGNAL(imagePrepareComplete(CxeError::Id)),

                this, SLOT(changeToPrecaptureView()));

        disconnect(&mEngine.videoCaptureControl(), SIGNAL(videoPrepareComplete(CxeError::Id)),

                this, SLOT(changeToPrecaptureView()));

    }

    // If normal mode is not active, don't switch to precapture view and reserve camera now.

    if (mApplicationState->currentState() != CxuiApplicationState::Normal) {

        CX_DEBUG(("CxuiViewManager - Change to precapture blocked as not normal mode (error, standby, background)."));

    } else {

        // Disconnect signals from old view.

        disconnectSignals();

        CxuiPrecaptureView *view =

            getPrecaptureView(mEngine.mode(), mEngine.cameraDeviceControl().cameraIndex());