/*

* Copyright (c) 2007-2009 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:  ESMR policymmanager implementation

*

*/

#include "emailtrace.h"

#include "cesmrpolicymanager.h"

//<cmail>

#include "cesmrpolicy.h"

#include <esmrpolicies.rsg>

#include "esmrdef.h"

//</cmail>

#include "esmrinternaluid.h"

#include "cesmrcalimportexporter.h"

#include "tesmrentryfield.h"

#include "cesmrpolicychecker.h"

#include "cesmrpolicyextensionmanager.h"

#include <coemain.h>// CCoeEnv

#include <barsread.h>

/// Unnamed namespace for local definitions

namespace {

// Definition for resource id array granularity

const TInt KESMRPolicyIdArrayGranularity = 4;

/**

 * Reads ESMR policy resource id table from resource.

 *

 * @param aReader Reference to resource reader.

 * @param aResourceIdTable Reference to resource id table.

 */

void ReadResourceIdArrayL(

        TResourceReader& aReader,

        RArray<TInt>& aResourceIdTable )

    {

    TInt numOfFields = aReader.ReadInt16();

    for (TInt i(0); i < numOfFields; i++ )

        {

        TInt resourceId= aReader.ReadInt32();

        aResourceIdTable.AppendL(resourceId);

        }

    }

#ifdef _DEBUG

_LIT( KESMRPolicyMgrPanic, "ESMRPolicyManager" );

enum TESMRPolicyManagerPanic

    {

    EESMRPolicyMgrNoPolicyFound = 1,

    EESMRPolicyMgrPopWithoutPush

    };

void Panic( TESMRPolicyManagerPanic aPanic )

    {

    User::Panic( KESMRPolicyMgrPanic, aPanic );

    }

/**

 * Logs policy information.

 *

 * @param aPolicy Reference to policy.

 */

void LogPolicy(

        const CESMRPolicy& aPolicy )

    {

    const RArray<TESMREntryField>& fieldArray = aPolicy.Fields();

    TInt fieldCount( fieldArray.Count() );

    for ( TInt i(0); i < fieldCount; ++i )

        {

        const TESMREntryField& field = fieldArray[i];

        }

    }

#define LOG_POLICY( x ) { LogPolicy( x ); } 

#else

#define LOG_POLICY( x )

#endif // _DEBUG

}  // namespace

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

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

// CESMRPolicyManager::CESMRPolicyManager

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

//

inline CESMRPolicyManager::CESMRPolicyManager()

:   iPolicyResourceIds( KESMRPolicyIdArrayGranularity )

    {

    FUNC_LOG;

    //do nothing

    }

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

// CESMRPolicyManager::~CESMRPolicyManager

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

//

EXPORT_C CESMRPolicyManager::~CESMRPolicyManager()

    {

    FUNC_LOG;

    delete iDefaultPolicyChecker;

    delete iCurrentPolicy;

    delete iExtension;

    iPolicyResourceFile.Close();

    iPolicyResourceIds.Close();

    iPolicyStack.ResetAndDestroy();

    }

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

// CESMRPolicyManager::NewL

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

//

EXPORT_C CESMRPolicyManager* CESMRPolicyManager::NewL()

    {

    FUNC_LOG;

    CESMRPolicyManager* self = new (ELeave) CESMRPolicyManager;

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;

    }

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

// CESMRPolicyManager::ConstructL

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

//

void CESMRPolicyManager::ConstructL()

    {

    FUNC_LOG;

    iDefaultPolicyChecker = CESMRPolicyChecker::NewL();

    iCoeEnv = CCoeEnv::Static();

    iExtension = CESMRPolicyExtensionManager::NewL( *iCoeEnv );

    }

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

// CESMRPolicyManager::ExtensionUid

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

//

EXPORT_C TUid CESMRPolicyManager::ExtensionUid()

    {

    FUNC_LOG;

    return TUid::Uid( KESMRPolicyMgrUid );

    }

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

// CESMRPolicyManager::ResolvePolicyL

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

//

EXPORT_C void CESMRPolicyManager::ResolvePolicyL(

        const TESMRScenarioData& aScenarioData,

        MESMRCalEntry& aESMREntry,

        MESMRPolicyChecker* aPolicyChecker )

    {

    FUNC_LOG;

    MESMRPolicyChecker* policyChecker = iDefaultPolicyChecker;

    if ( aPolicyChecker )

        {

        policyChecker = aPolicyChecker;

        }

    delete iCurrentPolicy;

    iCurrentPolicy = NULL;

    TInt policyCount( iPolicyResourceIds.Count() );

    for ( TInt i( 0 );

        ( i < policyCount) && !iCurrentPolicy;

          ++i )

        {

        ReadPolicyL( iPolicyResourceIds[i], aESMREntry );

        if ( !policyChecker->MatchesL( *iCurrentPolicy, aScenarioData ) )

            {

            // Policy did not match --> Reading next

            delete iCurrentPolicy;

            iCurrentPolicy = NULL;

            }

        }

    // Matching policy not found --> Panic

    __ASSERT_DEBUG( iCurrentPolicy, Panic(EESMRPolicyMgrNoPolicyFound) );

    if ( !iCurrentPolicy )

        {

        User::Leave( KErrNotFound );

        }

    // Logging policy for debugging purposes

    LOG_POLICY( *iCurrentPolicy )

    }

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

// CESMRPolicyManager::PushPolicyL

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

//

EXPORT_C void CESMRPolicyManager::PushPolicyL()

    {

    if ( iCurrentPolicy )

        {

        iPolicyStack.AppendL( iCurrentPolicy );

        iCurrentPolicy = NULL;

        }

    }

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

// CESMRPolicyManager::PopPolicy

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

//

EXPORT_C CESMRPolicy* CESMRPolicyManager::PopPolicy()

    {

    delete iCurrentPolicy;

    iCurrentPolicy = NULL;

    TInt stackCount = iPolicyStack.Count(); 

    if ( stackCount )

        {

        iCurrentPolicy = iPolicyStack[ --stackCount ];

        iPolicyStack.Remove( stackCount );

        }

    __ASSERT_DEBUG( iCurrentPolicy, Panic( EESMRPolicyMgrPopWithoutPush ) );

    return iCurrentPolicy;

    }

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

// CESMRPolicyManager::ReadPolicyFromResourceL

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

//

EXPORT_C void CESMRPolicyManager::ReadPolicyFromResourceL(

        const TDesC& aPolicyFile,

        TInt aPolicyArrayResourceId )

    {

    FUNC_LOG;

    iPolicyResourceFile.Close();

    iPolicyResourceFile.OpenL( iCoeEnv->FsSession(), aPolicyFile );

    iPolicyResourceFile.ConfirmSignatureL();

    // R_ESMR_POLICIES

    HBufC8* resourceIdBuffer =

        iPolicyResourceFile.AllocReadLC( aPolicyArrayResourceId );

    // Construct resource reader

    TResourceReader reader;

    reader.SetBuffer(resourceIdBuffer);

    // Read policy resource ids

    iPolicyResourceIds.Reset();

    ReadResourceIdArrayL(reader, iPolicyResourceIds );

    CleanupStack::PopAndDestroy( resourceIdBuffer );

    // Load extension resources

    iExtension->ReadResourcesFromExtensionsL();

    }

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

// CESMRPolicyManager::ReadPolicyL

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

//

void CESMRPolicyManager::ReadPolicyL(

        TInt aResourceId,

        MESMRCalEntry& /*aESMREntry */)

    {

    FUNC_LOG;

    HBufC8* resourceBuffer = NULL;

    // First try to find policy from static policies and then from extensions

    TRAPD( error, resourceBuffer = iPolicyResourceFile.AllocReadL( aResourceId ) );

    if ( resourceBuffer )

        {

        CleanupStack::PushL( resourceBuffer );

        }

    TResourceReader reader;

    CESMRPolicy* policy = NULL;

    if ( error == KErrNone && resourceBuffer )

        {

        reader.SetBuffer(resourceBuffer);

        policy = CESMRPolicy::NewL( iPolicyResourceFile, reader );

        }

    else

        {

        resourceBuffer = iExtension->ReadBufferL( aResourceId );

        CESMRExtensionResourceFile* file = NULL;

        if ( resourceBuffer )

            {

            CleanupStack::PushL( resourceBuffer );

            file = iExtension->ExtensionResourceFile( aResourceId );

            }

        if ( resourceBuffer && file )

            {

            reader.SetBuffer(resourceBuffer);

            policy = CESMRPolicy::NewL( file->ResFile(), reader );

            }

        }

    // Logging read policy

    LOG_POLICY( *policy )

    delete iCurrentPolicy; 

    iCurrentPolicy = policy;

    if ( resourceBuffer )

        {

        CleanupStack::PopAndDestroy( resourceBuffer );

        }

    }

// EOF