/*

* Copyright (c) 2007 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:  Handles most of the model related logic..

*

*/

#ifndef DEVDIAGDENGINE_H

#define DEVDIAGDENGINE_H

// System Include Files

#include <e32base.h>                // CActive

#include <etel3rdparty.h>           // CTelephony

#include <DiagResultsDatabase.h>    // RDiagResultsDatabase,

                                    // RDiagResultsDatabaseRecord

#include <DiagEngineObserver.h>     // MDiagEngineObserver

#include <DiagPluginPoolObserver.h> // MDiagPluginPoolObserver

#include <DiagCommonDialog.h>       // TDiagCommonDialog

// Forward Declarations

class MDevDiagEngineObserver;

class MDiagPlugin;

class MDiagSuitePlugin;

class CDevDiagExecResults;

class CDiagResultsDatabaseItem;

class CDiagEngine;

class RFs;

class CDiagPluginPool;

class CAknViewAppUi;

class CAknDialog;

class CIdle;

/**

 *  Device Diagnostics Application Engine

 *  This class defines the engine used by the Device Diagnostics application.  The

 *  engine class handles the interfacing between UI components and diagnostics

 *  components.

 *

 *  @lib euser.lib

 *  @lib diagframework.lib

 *  @lib etel3rdparty.lib

 *  @lib diagresultsdatabase.lib

 *  @lib avkon.lib

 *  @lib eikcore.lib

 *  @lib eiksrv.lib

 *  @lib efsrv.lib

 *  @lib drmserviceapi.lib

 */

class CDevDiagEngine : public CActive,

                       public MDiagEngineObserver,

                       public MDiagPluginPoolObserver

    {

public: // Data Types

    /**  This enum indicates how the engine should stop tests. */

    enum TDevDiagAppEngineStopMode

        {

        EStopModeSkip,

        EStopModeCancel,

        EStopModeSuspend,

        EStopModeWatchdog

        };

    enum TDevDiagAppEngineResumeMode

        {

        EResumeModeResume,

        EResumeModeWatchdog

        };

public: // New Functions

    /**

     * Two-phased constructor.

     */

    static CDevDiagEngine* NewL();

    /**

     * Two-phased constructor.

     * Leaves the new engine instance on the cleanup stack.

     */

    static CDevDiagEngine* NewLC();

    /**

    * Destructor.

    */

    virtual ~CDevDiagEngine();

    /**

     * Sets the engine observer, for receiving engine events.

     *

     * @param aObserver A pointer to a class implementing the observer

     *                  interface.  Ownership is not transferred.

     */

    void SetObserver( MDevDiagEngineObserver* aObserver );

    /**

     * Run a test or suite of tests.

     *

     * @param aUid The UID of the test or suite to execute.

     * @param aAppUi The application UI which is executing tests.

     */

    void ExecuteTestL( TUid aUid, CAknViewAppUi& aAppUi );

    /**

     * Gets the results from test execution.  Results may be from a log or

     * from live test execution.  The caller should check if results are

     * available before calling this function.

     *

     * @return A reference to the execution results.

     */

    const CDevDiagExecResults& ExecutionResults() const;

    /**

     * Instructs the engine to populate the execution results information with

     * the last set of logged data.  This may be followed by a call to

     * ExecutionResults to retrieve the data.

     */

    void LoadLastLoggedResultsL();

    /**

    * Get results of the suite. Observer will be notified when

    * results are ready (EDevDiagEngineCommandGetLastResult).

    * 

    * @param aParentUid UID of the plug-in whose results are needed.

    */

    void GetLastResultsL( TUid aParentUid );

    /**

     * Suspends, skips, or halts test execution.

     *

     * @param aReason The reason for stopping execution.

     */

    void ExecutionStopL( TDevDiagAppEngineStopMode aReason );

    /**

     * Resumes the diagnostics engine.  In the case of resuming suspended test

     * execution, this must have been preceded by a call to ExecutionStopL

     * with EStopModeSuspend specified.

     *

     * @param aReason The reason for resuming execution.

     */

    void ExecutionResumeL( TDevDiagAppEngineResumeMode aReason );

    /**

     * Gets the plugin pool, which is owned by the engine.

     *

     * @return A reference to the plugin pool.

     */

    const CDiagPluginPool& PluginPool() const;

    /**

     * Checks if the engine is currently running plugins.  This includes

     * when the engine is suspended for any reason.

     *

     * @return ETrue if plugins are running, EFalse otherwise.

     */

    TBool IsRunningPlugins() const;

    /**

     * Checks if the engine is currently stopping execution.

     *

     * @return ETrue if execution is being cancelled, EFalse otherwise.

     */

    TBool IsStoppingExecution() const;

    /**

     * Checks if the engine is initialzed (it has finished loading plugins).

     * This must be true before the runtime requirements can be checked or

     * the reference to the plugin pool can be returned.

     *

     * @return ETrue if plugins are loaded, EFalse otherwise.

     */

    TBool ArePluginsLoaded() const;

    /**

     * Checks if the engine has execution results available.  This must be

     * true before a reference to the results can be retrieved.

     *

     * @return ETrue if results are available, EFalse otherwise.

     */

    TBool HasExecutionResults() const;

    /**

     * Searches Results Database for a crashed test plug-in.

     * 

     * @param aPluginUid Plug-in Uid that crashed.

     * @return ETrue if crashed plug-in was found, EFalse otherwise.

     **/

    TBool CrashedPluginL( TUid& aPluginUid );

    /**

     * Marks the crashed test record as complete in the database.  This

     * means that the test record is not found again when calling CrashedTestRecordL.

     *

     * @return KErrNone if the record was successfully completed, otherwise, a

     *         system error code.

     */

    //TInt CompleteCrashedTestRecord();

    ///@@@KSR: changes for Codescanner error val = High

    TInt CompleteCrashedTestRecordL();

    ///@@@KSR: changes for Codescanner error val = High

    // ADO & Platformization Changes

    TBool GetPluginDependencyL();

    // GetState

    TInt GetState();

private: // Data Types

    /**  This enum indicates the engine's internal state.

     *   Any changes to this enum must be reflected with changes to the

     *   SetState function.

     */

    enum TDevDiagAppEngineState

        {

        EStateInitial = 0,

        EStateLoadingPlugins,

        EStateReady,

        EStateStartingExecution,

        EStateRunningTests,

        EStateStoppingExecution,

        EStateExecutionSuspended,

        EStateMax

        };

private: // New Functions

    /**

     * The default constructor.

     */

    CDevDiagEngine();

    /**

     * Two-phased constructor.

     */

    void ConstructL();

    /**

     * Handles state transitions in the application engine by validating the

     * requested transition.

     *

     * @param aNextState The new state to transition to.

     */

    void SetState( TDevDiagAppEngineState aNextState );

    /**

     * The callback function to continue handling cancelling execution.

     *

     * @param aPtr A pointer to "this" object.

     * @return Always KErrNone.

     */

    static TInt HandleExecutionCancelledL( TAny* aPtr );

private: // From base class CActive

    /**

     * From CActive.

     * This function is called when an active request completes.  For the

     * application engine, this only happens when checking runtime

     * requirements.

     */

    virtual void RunL();

    /**

     * From CActive.

     * This function is called to cancel any outstanding asynchronous

     * requests.

     */

    virtual void DoCancel();

private: // From base class MDiagEngineObserver

    /**

     * From MDiagEngineObserver.

     * This callback is used when test execution starts.

     *

     */

    virtual void TestExecutionBeginL();

    /**

    * Notify client of execution completion of one plug-in.

    *   This can be either test plug-in or suite plug-in.

    *

    * @param aError  - KErrNone - Success.

    *   KErrNoMemory - Out of memory.

    *   KErrCancel   - Cancelled due to ExecutionStopL()

    *

    * @param aResult - Result of the test. Ownership is transferred here. 

    *  Client must deallocate aResult to avoid memory leak. aResult is Null 

    *  if the plug-in being executed is a suite pre/post method.

    */

    virtual void TestExecutionPluginExecutedL( TInt aError,

                                               CDiagResultsDatabaseItem* aResult );

    /**

     * From MDiagEngineObserver.

     * This callback is used to inform the application of the execution

     * progress for the currently executing test.

     *

     * @param aCurrentItemStep The current step for this test.

     * @param aCurrentItemTotalSteps The total number of steps for this test.

     */

    virtual void TestExecutionProgressL( TUint aCurrentItemStep,

                                         TUint aCurrentItemTotalSteps);

    /**

    * From MDiagEngineObserver.

    * Notify client of engine stopping.

    *

    * This indicates that engine execution has stopped. There will not be any

    * further messages from engine. This could be called because all

    * tests are completed, or an unrecoverable error occured during execution.

    *

    * Note that if cancel is called during plan creation or if plan creation

    * fails, TestExecutionStoppedL() may be called withing first calling

    * TestExecutionBeginL(). 

    *

    * @param aError - Reason for engine stopping. 

    *   a) KErrNone - All tests are successfully completed.

    *   b) KErrCancel - ExecutionStopL is called with ECancelAll. 

    *       Test session cannot be resumed later.

    *   c) KErrArgument - Parameters passed to engine are invalid.

    *   d) Others - Other critical that could not be recovered occured during

    *       test execution.  Test may be resumed later in this case.

    */

    virtual void TestExecutionCompletedL( TInt aError );

    /**

     * From MDiagEngineObserver.

     * Notifes that execution has been suspended.

     *

     * @param aSuspendReason Why execution is suspended.

     */

    virtual void TestExecutionSuspendedL( TSuspendReason aSuspendReason );

    /**

     * From MDiagEngineObserver.

     * Notifes that execution has been resumed.

     *

     * @param aResumeReason Why execution is resumed.

     */

    virtual void TestExecutionResumedL( TResumeReason aResumeReason );

    /**

     * From MDiagEngineObserver.

     * Create a common dialog.

     * @param aDialogType Type of dialog to create.

     * @param aData Initialization parameter. Ownership is transferred.

     * @return A pointer to newly created dialog. Ownership is passed to

     *         caller.

    */

    virtual CAknDialog* CreateCommonDialogLC( TDiagCommonDialog aDialogType,

                                              TAny* aInitData );

    /**

    * From MDiagEngineObserver.

    *

    * Execute a command from plug-in. Parameters are identical to 

    * MDiagEngineCommon::ExecuteAppCommandL(). 

    * @see MDiagEngineCommon::ExecuteAppCommandL()

    * @see TDiagAppCommand

    */

    virtual void ExecuteAppCommandL( TDiagAppCommand aCommand, 

                                     TAny* aParam1,

                                     TAny* aParam2 );                                              

private: // From base class MDiagPluginPoolObserver

       /**

     * From MDiagPluginPoolObserver.

     * This callback is used to inform the application about loading progress

     * of plugins.

     *

     * @param aCurrentPlugin The current plugin index in the loading progress.

     * @param aPluginCount The total number of plugins to load.

     @ @param aLoadedPluginUid The UID of the plugin that was just loaded.

     */

    virtual void LoadProgressL ( TUint aCurrentPlugin,

                                 TUint aPluginCount,

                                 const TUid& aLoadedPluginUid );

    /**

    * Notify client of plug-in loading completion

    *

    * @param aError     KErrNone - Success

    *                   KErrCorrupt  - One ore more plugin could not

    *                   be loaded. 

    *                   KErrNoMemory - Not enough memory.

    */

    virtual void LoadCompletedL( TInt aError );

private: // Data

    /**

     * The application engine's current state.

     */

    TDevDiagAppEngineState iState;

    /**

     * The test execution results.

     * Own.

     */

    CDevDiagExecResults* iResults;

    /**

     * The current observer of the application engine.

     * Not own.

     */

    MDevDiagEngineObserver* iObserver;

    /**

     * The diagnostics engine.

     * Own.

     */

    CDiagEngine* iDiagEngine;

    /**

     * The session with the results database server.

     */

    RDiagResultsDatabase iResultsDatabase;

    /**

     * The plugin pool, which loads and owns plugins.

     * Own.

     */

    CDiagPluginPool* iPluginPool;

    /**

     * Holds the number of times suspend has been called.  In nested suspend /

     * resume scenarios, this is used to ensure we don't resume until we have

     * matched the number of suspends.

     */

    TInt iSuspendCounter;

     /**

     * A utility active object that is used to continue handling cancelling

     * execution, because we cannot use synchronous cancelling due to the

     * possibility of test plugins displaying the common "Cancel Execution"

     * dialog.

     * Own.

     */

    CIdle* iIdle;

    /**

    * Get Last results UIDs. Own.

    **/

    CArrayFixFlat<TUid>* iUids;

    /**

    * Buffered last results. Own.

    **/

    RPointerArray<CDiagResultsDatabaseItem> iLastResults;

    };

#endif // DEVDIAGDENGINE_H