/*

* 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:

*

*/

#include "cxezoomcontrolsymbian.h"

#include "cxecameradevicecontrol.h"

#include "cxefeaturemanager.h"

#include "cxesettings.h"

#include "cxutils.h"

#include "cxenamespace.h"

#include "cxestate.h"

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::CxeZoomControlSymbian

//

// ---------------------------------------------------------------------------

//

CxeZoomControlSymbian::CxeZoomControlSymbian(CxeCameraDevice &cameraDevice,

                                             CxeCameraDeviceControl &cameraDeviceControl,

                                             CxeSettings &settings,

                                             CxeFeatureManager &featureManager) :

    CxeStateMachine("CxeZoomControlSymbian"),

    mCameraDevice(cameraDevice),

    mCameraDeviceControl(cameraDeviceControl),

    mSettings(settings)

{

    CX_DEBUG_ENTER_FUNCTION();

    qRegisterMetaType<CxeZoomControl::State> ();

    // Initialize states and member variables

    initializeStates();

    // getting still max zoom limits from feature manager

    featureManager.configuredValues(CxeRuntimeKeys::STILL_MAX_ZOOM_LIMITS, mStillMaxZoomLimits);

    featureManager.configuredValues(CxeRuntimeKeys::VIDEO_MAX_ZOOM_LIMITS, mVideoMaxZoomLimits);

    connect(&mCameraDevice,

            SIGNAL(prepareForCameraDelete()),

            this,

            SLOT(reset()));

    // enabling setting value change call backs

    connect(&mSettings,

            SIGNAL(settingValueChanged(const QString&,QVariant)),

            this,

            SLOT(handleSettingValueChanged(const QString&,QVariant)));

    init();

    CX_DEBUG_EXIT_FUNCTION();

}

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::~CxeZoomControlSymbian

//

// ---------------------------------------------------------------------------

//

CxeZoomControlSymbian::~CxeZoomControlSymbian()

{

    CX_DEBUG_ENTER_FUNCTION();

    // clean up

    mDigitalZoomValues.Close();

    CX_DEBUG_EXIT_FUNCTION();

}

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::min

// Get the minimum zoom index

// ---------------------------------------------------------------------------

//

int CxeZoomControlSymbian::min() const

{

    return mMinZoomLevel;

}

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::max

// Get the maximum zoom index

// ---------------------------------------------------------------------------

//

int CxeZoomControlSymbian::max() const

{

    return mMaxZoomLevel;

}

void CxeZoomControlSymbian::init()

{

    CX_DEBUG_ENTER_FUNCTION();

    // Initialize the variables

    mMinZoomLevel = 0;

    mMaxZoomLevel = 0;

    mCurrentZoomLevel = 0;

    mDigitalZoomValues.Close();

    setState(Idle);

    CX_DEBUG_EXIT_FUNCTION();

}

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::reset

// Re-initializes the zoom control

// ---------------------------------------------------------------------------

//

void CxeZoomControlSymbian::reset()

{

    CX_DEBUG_ENTER_FUNCTION();

    init();

    emit zoomLevelChanged(mCurrentZoomLevel);

    CX_DEBUG_EXIT_FUNCTION();

}

/**

 * Settings changed, needs updated

 */

void CxeZoomControlSymbian::handleSettingValueChanged(const QString& settingId, QVariant /*newValue*/)

{

    CX_DEBUG_ENTER_FUNCTION();

    if (settingId == CxeSettingIds::IMAGE_QUALITY ||

        settingId == CxeSettingIds::VIDEO_QUALITY) {

        reset();

    } else {

        // do nothing

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* slot to prepare zoom control for still mode

*/

void CxeZoomControlSymbian::prepareZoomForStill(int ecamStillResolutionIndex)

{

    CX_DEBUG_ENTER_FUNCTION();

    if (mCameraDeviceControl.state() == CxeCameraDeviceControl::Ready) {

        init();

        // For image mode

        CCamera::TFormat format = CCamera::EFormatExif;

        TBool isInfluencePossible = EFalse;

        int error = KErrNone;

        // Get the zoom steps for image mode

        TRAP(error, mCameraDevice.advancedSettings()->GetDigitalZoomStepsForStillL (

                            mDigitalZoomValues,

                            mDigitalZoomValueInfo,

                            ecamStillResolutionIndex,

                            format,

                            isInfluencePossible));

        int imageQualityIndex;

        CxeError::Id cxErr = mSettings.get(CxeSettingIds::IMAGE_QUALITY, imageQualityIndex);

        if (cxErr == CxeError::None && mStillMaxZoomLimits.count() > 0) {

            // fetching the zoom limit based on the image quality

            mMaxZoomLevel = mStillMaxZoomLimits[imageQualityIndex];

        } else {

            mMaxZoomLevel = NOT_DEFINED;

        }

        finalizeZoomPreparation(error);

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* slot to prepare zoom control for video mode

*/

void CxeZoomControlSymbian::prepareZoomForVideo()

{

    CX_DEBUG_ENTER_FUNCTION();

    if (mCameraDeviceControl.state() == CxeCameraDeviceControl::Ready) {

        init();

        // if CxeCameraDeviceControl is ready, this pointer is valid

        CX_ASSERT_ALWAYS(mCameraDevice.advancedSettings())

        int error = KErrNone;

        TRAP(error,

                mCameraDevice.advancedSettings()->GetDigitalZoomStepsL(mDigitalZoomValues, mDigitalZoomValueInfo);

            );

        if (mVideoMaxZoomLimits.count() > 0) {

            // fetching the zoom limit based on the video quality

            mMaxZoomLevel = mVideoMaxZoomLimits[0];

        } else {

            mMaxZoomLevel = NOT_DEFINED;

        }

        finalizeZoomPreparation(error);

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/**

* Completes zoom control preparation.

*/

void CxeZoomControlSymbian::finalizeZoomPreparation(int error)

{

    CX_DEBUG_ENTER_FUNCTION();

    CX_DEBUG(("Num digital zoom steps: %d", mDigitalZoomValues.Count()));

    CX_DEBUG(("Maximum zoom limit: %d", mMaxZoomLevel));

    if (!error) {

        // Note that this is called only after setting the resolution.

        TCameraInfo cameraInfo;

        mCameraDevice.camera()->CameraInfo(cameraInfo);

        CX_DEBUG(("cameraInfo.iMinZoom: %d, cameraInfo.iMaxDigitalZoom: %d, cameraInfo.iMaxZoom: %d",

                            cameraInfo.iMinZoom, cameraInfo.iMaxDigitalZoom, cameraInfo.iMaxZoom ));

        CX_DEBUG(("cameraInfo.iMaxDigitalZoomFactor: %d", cameraInfo.iMaxDigitalZoomFactor));

        mMinZoomLevel = cameraInfo.iMinZoom;

        if ( (mMaxZoomLevel == NOT_DEFINED) || mMaxZoomLevel > cameraInfo.iMaxDigitalZoom) {

            CX_DEBUG(("Fetching maximum zoom limit value from ecam"));

            mMaxZoomLevel = cameraInfo.iMaxDigitalZoom;

        }

        // change the state, since zoom is now ready

        setState(Ready, KErrNone);

        mCameraDevice.advancedSettings()->SetDigitalZoom(mDigitalZoomValues[mCurrentZoomLevel]);

        // emit the zoom changed signal so that clients can do any updates if necessary.

        emit zoomLevelChanged(mCurrentZoomLevel);

    }

    CX_DEBUG_EXIT_FUNCTION();

}

// ---------------------------------------------------------------------------

// CxeZoomControlSymbian::zoomTo

// Zooms to the level specified in the parameter.

// ---------------------------------------------------------------------------

//

void CxeZoomControlSymbian::zoomTo(int value)

{

    CX_DEBUG_ENTER_FUNCTION();

    CX_DEBUG(("Zoom to: %d, current zoom: %d", value, mCurrentZoomLevel));

    // If not currently zooming and value falls between min & max

    // then zoom to the passed level. Also there's no need to zoom if new zoom

    // level is same as the current.

    if (state() == CxeZoomControl::Ready && (value <= mMaxZoomLevel)

            && (value >= mMinZoomLevel) && (mCurrentZoomLevel != value)) {

        // Set the appropriate zooming state

        if (value < mCurrentZoomLevel) {

            setState(CxeZoomControl::ZoomingOut);

        } else {

            setState(CxeZoomControl::ZoomingIn);

        }

        // Could also check the number of values in the array to avoid out of bounds indexing,

        // though this is done in alternate way by the min and max limits.

        mCameraDevice.advancedSettings()->SetDigitalZoom(mDigitalZoomValues[value]);

        mCurrentZoomLevel = value;

        //! @todo: Wait for zoom callback: ECamEventZoomStateChanged ?

        // set the state to idle.

        setState(CxeZoomControl::Ready);

        // Emit the zoom level change signal

        emit zoomLevelChanged(mCurrentZoomLevel);

    }

    CX_DEBUG_EXIT_FUNCTION();

}

CxeZoomControl::State CxeZoomControlSymbian::state() const

{

    return static_cast<State> (stateId());

}

void CxeZoomControlSymbian::handleStateChanged(int newStateId,

                                               CxeError::Id error)

{

    emit stateChanged(static_cast<State> (newStateId), error);

}

void CxeZoomControlSymbian::initializeStates()

{

    // addState( id, name, allowed next states )

    addState(new CxeState(Idle, "Idle", Ready));

    addState(new CxeState(ZoomingIn, "ZoomingIn", Ready | ZoomingOut | Idle));

    addState(new CxeState(ZoomingOut, "ZoomingOut", Ready | ZoomingIn | Idle));

    addState(new CxeState(Ready, "Ready", Idle | ZoomingOut | ZoomingIn));

    setInitialState(Idle);

}