/*
 * 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:  ?Description
 *
 */

// INCLUDE FILES
#include <f32file.h>
#include <s32file.h>
#include <sysutil.h>
#include "casrvmmchistory.h"
// CONSTANTS
LOCAL_D const TInt KCaMmcHistoryLength = 2;

// ==================== MEMBER FUNCTIONS ====================

// ---------------------------------------------------------
//
// ---------------------------------------------------------
//
CCaSrvMmcHistory::CCaSrvMmcHistory()
	{
	}

// ---------------------------------------------------------
//
// ---------------------------------------------------------
//
void CCaSrvMmcHistory::ConstructL()
	{
	}

// ---------------------------------------------------------
//
// ---------------------------------------------------------
//
EXPORT_C CCaSrvMmcHistory* CCaSrvMmcHistory::NewL()
     {
     CCaSrvMmcHistory* self = new (ELeave) CCaSrvMmcHistory();
     CleanupStack::PushL( self );
     self->ConstructL();
     CleanupStack::Pop( self );
     return self;
     }

// ---------------------------------------------------------
//
// ---------------------------------------------------------
//
CCaSrvMmcHistory::~CCaSrvMmcHistory()
    {
    iMmcList.Close();
    }

// ---------------------------------------------------------
//
// ---------------------------------------------------------
//
EXPORT_C void CCaSrvMmcHistory::LoadL( RFs& aFs, const TDesC& aFname )
    {
    iMmcList.Reset();
    TUint att;
    if( KErrNotFound != aFs.Att( aFname, att ) )
        {
        RFileReadStream stream;
        CleanupClosePushL( stream );
        User::LeaveIfError( stream.Open( aFs, aFname, EFileStream
                | EFileShareReadersOnly ) );
        TInt len = Min( KCaMmcHistoryLength, stream.ReadInt32L() );
        while( len-- )
            {
            iMmcList.AppendL( stream.ReadUint32L() );
            }
        CleanupStack::PopAndDestroy( &stream );
        }
    }

// ---------------------------------------------------------
// CMenuSrvMmcHistory::SaveL
// Method do not work if there is no free space on C drive.
// ---------------------------------------------------------
//
EXPORT_C void CCaSrvMmcHistory::SaveL( RFs& aFs, const TDesC& aFname )
    {
    if( SysUtil::DiskSpaceBelowCriticalLevelL( &aFs, 0, EDriveC ) )
        {
        return;
        }

    RFileWriteStream stream;
    CleanupClosePushL( stream );
    User::LeaveIfError( stream.Replace( aFs, aFname, EFileStream
            | EFileShareExclusive ) );
    stream.WriteInt32L( iMmcList.Count() );
    for( TInt i = 0; i < iMmcList.Count(); i++ )
        {
        stream.WriteUint32L( iMmcList[i] );
        }
    CleanupStack::PopAndDestroy( &stream );
    }

// ---------------------------------------------------------
// CMenuSrvMmcHistory::InsertL
// ---------------------------------------------------------
//
EXPORT_C void CCaSrvMmcHistory::InsertL( TUint aMmc )
    {
    TInt i = iMmcList.Find( aMmc );
    switch( i )
        {
        case 0:
            {
            // aMmc is already first, do nothing.
            break;
            }

        case KErrNotFound:
            {
            // aMmc is not in the list. Insert as first.
            if( iMmcList.Count() == KCaMmcHistoryLength )
                {
                // List already full - remove last item to make space.
                iMmcList.Remove( KCaMmcHistoryLength - 1 );
                }
            iMmcList.InsertL( aMmc, 0 );
            break;
            }

        default:
            {
            // aMmc is in the list, but not first. Move to first place.
            iMmcList.Remove( i );
            iMmcList.InsertL( aMmc, 0 );
            break;
            }
        }
    }

// ---------------------------------------------------------
// CMenuSrvMmcHistory::Find
// ---------------------------------------------------------
//
EXPORT_C TInt CCaSrvMmcHistory::Find( TUint aMmc )
    {
    return iMmcList.Find( aMmc );
    }

//  End of File