/*

* Copyright (c) 2008 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:  Task monitor engine

 *

*/

#ifndef TSFSWENGINE_H

#define TSFSWENGINE_H

#include <e32base.h>

#include <e32cmn.h>

#include <s32strm.h>

#include <fbs.h>

#include <eikenv.h>

#include <w32std.h>

#include <e32hashtab.h>

#include <apgcli.h>

#include <e32property.h>

#include "tspreviewobserver.h"

#include "tsfswentry.h"

#include "tsfswobservers.h"

class CTsFsAlwaysShownAppList;

class CTsFsHiddenAppList;

class CTsFsWidgetList;

class MTsFswEngineObserver;

class CTsFswIconCache;

class CTsFastSwapPreviewProvider;

class CApaWindowGroupName;

// descriptor big enough to store hex repr of 32-bit integer plus 0x prefix

typedef TBuf<10> TAppUidHexString;

/**

 * Engine for fast swap server.

 * Performs task monitoring, notifications about wg changes are

 * received from the appui.

 */

NONSHARABLE_CLASS( CTsFswEngine ) : public CActive,

        public MTsFswTaskListObserver,

        public MTsFswResourceObserver,

        public MTsFsHiddenAppListObserver,

        public MTsFastSwapPreviewObserver

    {

public:

    /**

     * Creates a new instance.

     * @param   aObserver   ref to observer

     */

    IMPORT_C static CTsFswEngine* NewL( MTsFswEngineObserver& aObserver );

    /**

     * @copydoc NewL

     */

    IMPORT_C static CTsFswEngine* NewLC( MTsFswEngineObserver& aObserver );

    /**

     * Destructor.

     */

    ~CTsFswEngine();

    /**

     * Returns a reference to the current content.

     * Also performs sanity checks, e.g. associates application icons

     * when no screenshot has been received.

     * @return  ref to content array

     */

    IMPORT_C const RTsFswArray& FswDataL();

    /**

     * Tries to close the given app.

     * @param   aWgId   value given by WgId() for an entry in iData

     */

    IMPORT_C void CloseAppL( TInt aWgId );

    /**

     * Brings the given app to foreground.

     * @param   aWgId   value given by WgId() for an entry in iData

     */

    IMPORT_C void SwitchToAppL( TInt aWgId );

    /**

     * Returns the uid of the foreground app or KNullUid.

     * Will never return hidden apps, only those which can

     * also be seen in the array returned by FswDataL.

     *

     * In case of embedded apps the behaviour is controlled

     * by aType: it will return either the uid of the embedded

     * application or the container app.

     *

     * @param   aType   @see CTsFswClient::TTsFswFgAppType

     */

    IMPORT_C TUid ForegroundAppUidL( TInt aType );

private:

    // from CActive

    void RunL();

    TInt RunError( TInt aError );

    void DoCancel();

    // from MTsFswTaskListObserver

    void UpdateTaskList();

    // from MTsFswResourceObserver

    void HandleResourceChange( TInt aType );

    // from MTsFsHiddenAppListObserver

    void HiddenAppListUpdated();

    // from MTsFastSwapPreviewObserver

    void HandleFswPpApplicationChange( TInt aWgId, TInt aFbsHandle );

    void HandleFswPpApplicationUnregistered( TInt aWgId );

private:

    /**

     * Constructor.

     */

    CTsFswEngine( MTsFswEngineObserver& aObserver );

    /**

     * Performs 2nd phase construction.

     */

    void ConstructL();

    /**

     * Gets the window group list and reconstructs the fsw content.

     * @return   TBool   ETrue if the list has been modified

     */

    TBool CollectTasksL();

    /**

     * Called from CollectTasksL for each entry in the task list.

     * @param   aWgId       window group id

     * @param   aAppUid     application uid

     * @param   aWgName     window group name or NULL

     * @param   aNewList    list to add to

     * @param   aIsWidget   true if the entry corresponds to a web widget

     * @return  TBool   ETrue if it was really a new entry in the list

     */

    TBool AddEntryL( TInt aWgId, const TUid& aAppUid,

        CApaWindowGroupName* aWgName, RTsFswArray& aNewList,

        TBool aIsWidget );

    /**

     * Checks if there is an entry for same app in the content list.

     * If yes then it takes some of the data for the entry that

     * will correspond to the same app in the refreshed content list.

     * @param   aEntry      new entry in content list

     * @param   aAppUid     application uid

     * @param   aChanged    ref to change-flag, set to ETrue if it is sure

     * that the new content list will be different from the previous one

     * @param   aNewList    ref to new content list

     * @return  ETrue if app was found

     */

    TBool CheckIfExistsL( CTsFswEntry& aEntry,

        const TUid& aAppUid,

        TBool& aChanged,

        RTsFswArray& aNewList );

    /**

     * Adds running widgets to the list.

     * @param   aNewList    array to add to

     */

    void CheckWidgetsL( RTsFswArray& aNewList );

    /**

     * Finds out the app uid for the given window group id.

     * @param   aWgId   a valid window group id

     * @return  application uid

     */

    TUid AppUidForWgIdL( TInt aWgId );

    /**

     * Returns the parent's wg id or KErrNotFound.

     * @param   aWgId   a valid window group id

     * @return parent wg id or KErrNotFound if there is no parent

     */

    TInt FindParentWgId( TInt aWgId );

    /**

     * Finds out the application name.

     * @param   aWindowName window group name or NULL

     * @param   aAppUId     application uid

     * @param   aWgId       window group id

     * @return  application name, ownership transferred to caller

     */

    HBufC* FindAppNameLC( CApaWindowGroupName* aWindowName,

        const TUid& aAppUid, TInt aWgId );

    /**

     * Makes a copy of the bitmap with the given handle.

     * @param   aFbsHandle          bitmap handle

     * @param   aKeepAspectRatio    if true then aspect ratio is kept

     * @return  CFbsBitmap*     the copy, ownership transferred to caller

     */

    CFbsBitmap* CopyBitmapL( TInt aFbsHandle, TBool aKeepAspectRatio );

    /**

     * Checks if the app to which the screenshot belongs is in the task list

     * and updates the entry when found. Also triggers change notification

     * to observer when data is modified.

     * @param   aWgIdForScreenshot  wgid for the screenshot 

     * @param   aBitmapHandle       handle for screenshot bitmap

     */

    void AssignScreenshotHandle( TInt aWgIdForScreenshot, TInt aBitmapHandle );

    /**

     * Returns the bitmap handle for the screenshot belonging to the given app

     * or 0 if not (yet) found.

     * @param   aWgIdForApp     a window group id (from the window group list)

     * @return  bitmap handle or 0

     */

    TInt LookupScreenshotHandle( TInt aWgIdForApp );

    /**

     * Callback for the iUpdateStarter timer.

     * Calls CollectTasksL and notifies the observer if the task list

     * has really been modified.

     */

    static TInt UpdateStarterCallback( TAny* aParam );

    /**

     * Brings the given web widget to foreground.

     * @param   aWidgetIndex    index in the list of running widgets

     */

    void SwitchToWidgetL( TInt aWidgetIndex );

    /**

     * Configues the preview provider with current screen size.

     */

    void SetPreviewParams();

    /**

     * Registers and unregisters window groups to iPreviewProvider

     * if the window group list has been changed.

     */

    void UpdatePreviewContent();

    /**

     * Gets and publishes the foreground app uid to CFW.

     */

    void PublishFgAppUidL();

    /**

     * Helper function to publish something to CFW.

     * @param   aType   context type

     * @param   aValue  value to publish

     */

    //void PublishContextL( const TDesC& aType, const TDesC& aValue );

private: // data    

    MTsFswEngineObserver& iObserver;

    RTsFswArray iData; // current fsw content, i.e. the task list

    CEikonEnv* iEnv; // not own

    // always shown app list, own    

    CTsFsAlwaysShownAppList* iAlwaysShownAppList;

    // hidden app list, own

    CTsFsHiddenAppList* iHiddenAppList;

    // web widget list, own

    CTsFsWidgetList* iWidgetList;

    // window server session

    RWsSession iWsSession;

    // apparc session

    RApaLsSession iAppArcSession;

    /**

     * Hash table storing the screenshots.

     * Key: window group id for the screenshot

     * (the one received in ApplicationChange)

     * Value: CFbsBitmap*, pointers owned

     */    

    RHashMap<TInt, CFbsBitmap*> iScreenshots;

    // preview provider instance, own

    CTsFastSwapPreviewProvider* iPreviewProvider;

    // timer to defer content refresh

    CPeriodic* iUpdateStarter;

    // app icon provider/container instance, own

    CTsFswIconCache* iAppIcons;

    // true if web widgets are supported by the system

    TBool iWidgetsSupported;

    // wgid of widget appui is saved here

    TInt iWidgetAppUiWgId;

    // PS property to listen for swi status changes

    RProperty iSwiProp;

    // when true CollectTasksL will call GetAllApps etc.

    // which is slow and need not be done normally, except

    // during startup and perhaps when new applications are installed

    TBool iAppDataRefreshNeeded;

    // window group ids returned by last WindowGroupList call

    RArray<TInt> iWgIds;

    // Dirty flag, indicates that iData is not up-to-date because

    // there were no subscribed clients during a previous possible

    // change of the task list.

    TBool iTaskListDirty;

    // For publishing the foreground app uid to Context Framework    

    TAppUidHexString iFgAppUidStr;

    TUid iFgAppUid;

    };

#endif