/*

* 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:

*

*/

#ifndef __MENUENG_H__

#define __MENUENG_H__

#include <e32base.h>

#include <xcfwengine.h>

#include <xcfwtree.h> // for RNodeArray

#include "mcsmenunotifier.h" // for notification events

// FORWARD DECLARATION

class TMenuItem;

class CXCFWTree;

class MXCFWNode;

class CMenuEngObjectFactoryProxy;

class CMenuEngObject;

class CMenuEngIdManager;

class MMenuEngObserver;

class MMenuEngOperation;

class MMenuEngFilter;

class MMenuEngVisitor;

/**

* Event notification data.

*/

class TMenuEngNotify

    {

public:     // construction

    /**

    * Constructor.

    * @param aFolder Folder.

    * @param aEvents Events.

    */

    TMenuEngNotify( TInt aFolder, TInt aEvents )

        : iFolder( aFolder ), iEvents( aEvents ) {}

public:     // data

    TInt iFolder; ///< Folder.

    TInt iEvents; ///< Events.

    };

/**

* Menu Engine.

*/

NONSHARABLE_CLASS( CMenuEng ): public CActive, public MXCFWEngineObserver

    {

public:     // construction

    /**

    * Destructor.

    */

    IMPORT_C virtual ~CMenuEng();

    /**

    * Two-phased constructor.

    * @param aName Name.

    * @param aObserver Observer.

    * @return The created object.

    */

    IMPORT_C static CMenuEng* NewL(

        const TDesC& aName,

        MMenuEngObserver& aObserver );

protected:  // construction

    /**

    * Constructor.

    * @param aObserver Observer.

    */

    CMenuEng( MMenuEngObserver& aObserver );

    /**

    * Second phase constructor.

    * @param aName Name.

    */

    void ConstructL( const TDesC& aName );

public:     // new methods

    enum TState /// State machine states.

        {

        ENull = 0, ///< Initial state.

        ELoadRamFile, ///< Loading RAM file.

        ELoadRomFile, ///< Loading ROM file.

        ESaveFile, ///< Saving TEMP file and replacing RAM file.

        EExecuteOp, ///< Operation scheduled for execution or being executed.

        EReady, ///< Idle.

        EDead ///< Unrecoverable error; final state.

        };

    /**

    * Queue an operation for execution.

    * Queued operations are scheduled for execution by the Engine.

    * @param aOperation Operation.

    */

    IMPORT_C void QueueOperationL( MMenuEngOperation& aOperation );

    /**

    * Dequeue an operation (remove from the operation queue). Safe to call

    * if not queued.

    * @param aOperation Operation.

    */

    IMPORT_C void DequeueOperation( MMenuEngOperation& aOperation );

    /**

    * Traverse a subtree of the item tree.

    * @param aFolder traversal starts at this folder.

    * @param aVisitor Visitor visiting the nodes and controlling the traversal.

    */

    IMPORT_C void TraverseFolderL(

        TInt aFolder,

        MMenuEngVisitor& aVisitor ) const;

    /**

    * Create a new object. Owner is the caller. The object is not added to

    * the engine yet, but it has an ID already. It can be used to AddL() item.

    * @param aType Type.

    * @return Created object. Owner is the caller.

    */

    IMPORT_C CMenuEngObject* NewObjectL( const TDesC& aType );

    /**

    * Returns current engine state.

    * @return Current state.

    */

	inline TState State() const;

	/*

	* Gets legacy format

	* @return legacy format

	*/

	IMPORT_C TBool GetOnceLegacyFormat();

public:     // data query (read access)

    // Read-access methods can be called any time.

    // There is a short startup period during which the engine data is not

    // ready yet; calls made in that period leave with KErrNotReady.

    // When the engine becomes ready, an (0 ,EItemsAddedRemoved) event is

    // sent to the observer.

    /**

    * Get ID of root folder.

    * @param aId ID of root folder.

    */

    IMPORT_C void RootFolderL( TInt& aId ) const;

    /**

    * Get parent folder of item.

    * @param aId Item ID.

    * @param aParentId ID of parent folder.

    */

    IMPORT_C void ParentFolderL( TInt aId, TInt& aParentId ) const;

    /**

    * Get item header.

    * @param aId Item ID.

    * @param aItem Item header is returned here.

    */

    IMPORT_C void GetItemL( TInt aId, TMenuItem& aItem ) const;

    /**

    * Get list of items.

    * @param aItemArray Array receiving item list. Existing content not touched

    * (new items are appended).

    * @param aFolder Get items from this folder.

    * @param aFilter Filter criteria or NULL for unfiltered results.

    * @param aRecursive ETrue to recurse folders, EFalse for immediate

    * children only.

    */

    IMPORT_C void GetItemsL(

        RArray<TMenuItem>& aItemArray,

        TInt aFolder,

        const MMenuEngFilter* aFilter,

        TBool aRecursive ) const;

    /**

    * Get object.

    * @param aId Item ID.

    * @return Object.

    */

    IMPORT_C const CMenuEngObject& ObjectL( TInt aId ) const;

public:     // data manipulation (write access).

    // All write-access methods methods must be wrapped in MMenuEngOperation

    // objects (scheduled execution), otherwise they leave with KErrLocked.

    /**

    * Remove item.

    * @param aId ID of item to be removed.

    */

    IMPORT_C void RemoveL( TInt aId );

    /**

    * Move items to another folder.

    * @param aItems ID-s of items to be to be moved. All items must be in

    * the same folder.

    * @param aFolder Target folder.

    * @param aMoveBefore. In the target folder, items will be inserted before

    * this item (if found). If the target folder contains no item with that ID,

    * the moved items are appended to the end of existing items. Pass 0 to

    * append to the end.

    */

    IMPORT_C void MoveToFolderL(

        RArray<TInt>& aItems,

        TInt aFolder,

        TInt aMoveBefore );

    /**

    * Move item to a different position in its current folder.

    * @param aId ID of item to be to be reordered.

    * @param aMoveBefore. Move the item before this item (if found).

    * If aMoveBefore is not found, the item is moved to the end.

    */

    IMPORT_C void ReorderL( TInt aId, TInt aMoveBefore );

    /**

    * Add new object.

    * @param aObject Object to be added. Note, the object must have been

    * created with NewObjectL of THIS engine (or the call fails)!

    * Ownership taken.

    * @param aFolder Parent folder.

    * @param aMoveBefore. Move the item before this item (if found).

    * If aMoveBefore is not found, the item is added to the end.

    */

    IMPORT_C void AddL(

        CMenuEngObject& aObject,

        TInt aFolder,

        TInt aInsertBefore );

    /**

    * Get modifiable object. Note: when this method is called, the engine

    * marks the object as changed (without checking if there was really

    * a change or not). Therefore, it is advisable to use ObjectL() to

    * investigate an object, and only call ModifiableObjectL if changes are

    * really needed. This results in better performace, as it avoids

    * unnecessary saving.

    * @param aId Item ID.

    * @param aEvent event for engine to append.

    * @return Modifiable object. Already marked as changed.

    */

    IMPORT_C CMenuEngObject& ModifiableObjectL( TInt aId,

    		TInt aEvent = RMenuNotifier::EItemAttributeChanged );

    /**

    * Append new notification to the list of pending notifications.

    * @param aFolder Folder.

    * @param aEvents Events.

    */

    IMPORT_C void AppendNotifyL( TInt aFolder, TInt aEvents );

    IMPORT_C TBool Exist( TInt aId ) const;

private:    // from CActive

    /**

    * Outstanding request completed.

    */

    void RunL();

    /**

    * Cancel outstanding request.

    */

    void DoCancel();

    /**

    * Handle error.

    * @param aError Error code.

    * @return KErrNone.

    */

    TInt RunError( TInt aError );

private:    // from MXCFWEngineObserver

    /**

    * Called when Engine parsing / saving state changes.

    * @param aEvent Engine event

    */

    void HandleEngineEventL( TXCFWEngineEvent aEvent );

    /**

    * Called when there's an error during parsing / saving.

    * @param aErrorCode Error code

    */

    void HandleEngineErrorL( TInt aErrorCode );        

private:    // types

    enum TFile /// File selector.

        {

        ERomFile, ///< Factory file in ROM.

        ERamFile, ///< Working file in RAM.

        ETempFile, ///< Temp file for saving (RAM).

        };

private:    // new methods

    /**

    * Get object from node.

    * @param aNode Node.

    * @return Object.

    */

    inline CMenuEngObject& Object( MXCFWNode& aNode ) const;

    /**

    * Tree is up, perform structure check.

    * @param aTree Tree.

    * @return The root folder node.

    */

    MXCFWNode& CheckTreeL( MXCFWTree& aTree ) const;

    /**

    * Sanity ID check for all nodes in the tree.

    * @param aTree Tree.

    * @return ETrue if ID-s are OK.

    */

    TBool DebugSanityCheck( MXCFWTree& aTree ) const;

    /**

    * Wait for data xml file to load.

    */

    void ActiveWaitForFileLoadL();

    /**

    * Sanity ID check for one nodes in the tree.

    * @param aNode Node.

    * @return ETrue if ID is OK.

    */

    TBool DebugSanityCheck( MXCFWNode& aNode ) const;

    /**

    * Find node by ID, leave with KErrNotFound if not found.

    * @param aId ID.

    * @return Node.

    */

    MXCFWNode& NodeL( TInt aId ) const;

    /**

    * Find folder node by ID, leave with KErrNotFound if not found or not

    * folder.

    * @param aId ID.

    * @return Folder node.

    */

    MXCFWNode& FolderNodeL( TInt aId ) const;

    /**

    * Find child of aParent with given id, or NULL. Not recursive.

    * @param aParent Folder.

    * @param aId Child ID.

    * @return Child or NULL.

    */

    MXCFWNode* Child( MXCFWNode& aParent, TInt aId );

    /**

    * Cancel all operations in the queue.

    */

    void CancelAllOperations();

    /**

    * Validate content filename. Leave with KErrArgument if not valid.

    * @param aName Content filename (without extension).

    */

    void ValidateNameL( const TDesC& aName );

    /**

    * Generate filename of content file.

    * @param aFname Generated filename is returned here.

    * @param aSelector Filename selector.

    */

    void GetFileNameL( TFileName& aFname, TFile aSelector );

    /**

    * Traverse a node.

    * @param aNode Node.

    * @param aVisitor Visitor visiting the nodes and controlling the traversal.

    */

    TBool TraverseNodeL( MXCFWNode& aNode, MMenuEngVisitor& aVisitor ) const;

    /**

    * Tree is up; create and initialize ID manager and tree ID-s.

    * @param aRootNode Root node.

    */

    void InitIdManagerL( MXCFWNode& aRootNode );

    /**

    * Read id_seed from the tree.

    * @param aIdSeed ID seed.

    */

    void GetIdSeedL( TInt& aIdSeed );

    /**

    * Write the id_seed to the tree.

    * @param aSeed ID seed.

    */

    void SetIdSeedL( TInt aSeed );

private:    // state machine parts

    /**

    * Self-completion: go to RunL() asynchronously.

    * @param aError Error code.

    */

    void SelfComplete( TInt aError );

    /**

    * Initiate loading RAM file.

    */

    void LoadRamFileL();

    /**

    * Initiate loading ROM file.

    */

    void LoadRomFileL();

    /**

    * Initiate saving to TEMP file.

    */

    void SaveTempFileL();

    /**

    * Replace RAM file with TEMP file.

    */

    void ReplaceRamFileL();

    /**

    * Complete current operation, if any.

    * @param aError Completion code.

    */

    void CompleteCurrentOperation( TInt aError );

    /**

    * Start executing next operation, if any.

    */

    void ExecuteOperationL();

    /**

    * Save changes, if any.

    */

    void SaveChangesL();

private:    // data

    RBuf iName; ///< Own.

    RBuf iTempFileName; ///< Own.

    RBuf iRamFileName; ///< Own.

    TBool iChanged; ///< ETrue if there are unsaved changes.

    MMenuEngObserver& iObserver;

    TState iState; ///< State.

    CXCFWTree* iTree; ///< DOM tree. Own.

    CXCFWEngine* iEngine; ///< XML Engline. Own.

    CMenuEngObjectFactoryProxy* iObjectFactory; ///< Object factory. Own.

    TInt iRoot; ///< Cached root folder id.

    RPointerArray<MMenuEngOperation> iOperations; ///< Pending operations.

    MMenuEngOperation* iCurrentOperation; ///< Operation being served.

    RArray<TMenuEngNotify> iNotifyQueue; ///< Events for notifiers.

    RFs iFs; ///< File Server Session. Own.

    CMenuEngIdManager* iIdManager; ///< ID manager. Owned.

    CActiveSchedulerWait* iActiveWait;

    /*

    * Legacy format

    */

    TBool iLegacyFormat;

    /**

     * True if the last saving was unsuccessful

     */

    TBool iDiskWasFullAndRamFileWasNotCreated;

    };

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

// CMenuEng::State

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

// 

CMenuEng::TState CMenuEng::State() const

    {

    return iState;

    }

#endif // __MENUENG_H__