/*

* 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:  Helper class to filter results

*

*/

// INCLUDES

#include "CPcsAlgorithm1FilterHelper.h"

#include "CPcsDebug.h"

// Compare functions

TBool ComparePsPattern ( const TPsPatternDetails& aFirst, const TPsPatternDetails& aSecond )

{

	return (CPcsAlgorithm1Utils::MyCompareC(*(aFirst.matchPattern), *(aSecond.matchPattern)));

}

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

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

// CPcsAlgorithm1FilterHelper::NewL

// Two Phase Construction

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

CPcsAlgorithm1FilterHelper* CPcsAlgorithm1FilterHelper::NewL(TSortType aSortType)

{

    PRINT ( _L("Enter CPcsAlgorithm1FilterHelper::NewL") );

	CPcsAlgorithm1FilterHelper* self = new ( ELeave ) CPcsAlgorithm1FilterHelper();

	CleanupStack::PushL( self );

	self->ConstructL(aSortType);

	CleanupStack::Pop( self );

    PRINT ( _L("End CPcsAlgorithm1FilterHelper::NewL") );

	return self;

}

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

// CPcsAlgorithm1FilterHelper::CPcsAlgorithm1FilterHelper

// Two Phase Construction

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

CPcsAlgorithm1FilterHelper::CPcsAlgorithm1FilterHelper()

{		

    PRINT ( _L("Enter CPcsAlgorithm1FilterHelper::CPcsAlgorithm1FilterHelper") );

    PRINT ( _L("End CPcsAlgorithm1FilterHelper::CPcsAlgorithm1FilterHelper") );

}

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

// CPcsAlgorithm1FilterHelper::ConstructL

// Two Phase Construction

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

void CPcsAlgorithm1FilterHelper::ConstructL(TSortType aSortType)

{

    PRINT ( _L("Enter CPcsAlgorithm1FilterHelper::ConstructL") );

    iSortType = aSortType;

    iResultCount = -1;

    PRINT ( _L("End CPcsAlgorithm1FilterHelper::ConstructL") );

} 

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

// CPcsAlgorithm1FilterHelper::~CPcsAlgorithm1FilterHelper

// Destructor

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

CPcsAlgorithm1FilterHelper::~CPcsAlgorithm1FilterHelper()

{

    PRINT ( _L("Enter CPcsAlgorithm1FilterHelper::~CPcsAlgorithm1FilterHelper") );        

    // delete match pattern pools

    for(TInt i = 0; i < iMatchPatternPools.Count(); i++)

    {

    	iMatchPatternPools[i]->Reset();

    	delete iMatchPatternPools[i];

    	iMatchPatternPools[i] = NULL;

    }

    iMatchPatternPools.Reset(); 

    // delete match pattern details

    for(TInt i = 0; i < iMatchPatternDetails.Count(); i++)

    {

    	delete iMatchPatternDetails[i]->matchPattern;

    	for(TInt j=0; j< iMatchPatternDetails[i]->subPatternArray.Count();j++)

    	{

    		delete iMatchPatternDetails[i]->subPatternArray[j]->matchPattern;

    		iMatchPatternDetails[i]->subPatternArray[j]->matchPattern = NULL;

    	}

    	iMatchPatternDetails[i]->subPatternArray.ResetAndDestroy();

    }

    iMatchPatternDetails.ResetAndDestroy();

    PRINT ( _L("End CPcsAlgorithm1FilterHelper::~CPcsAlgorithm1FilterHelper") );

}

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

// CPcsAlgorithm1FilterHelper::AddL

// 

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

void CPcsAlgorithm1FilterHelper::AddL(CPsData* psData, RPointerArray<TDesC>& aPatternSequence)

{

	if(iSortType == EAlphabetical)

	{

		// Create pool if not already present 

		if(iMatchPatternPools.Count() == 0 )

		{

			RPointerArray<CPsData> *tempPsDataArray = new (ELeave) RPointerArray<CPsData> ();

        	iMatchPatternPools.Append(tempPsDataArray);

		}

		// Add result to the result set

		iMatchPatternPools[0]->Append(psData);

		// Update the count

		iResultCount++;

		// Update sequence list

		for(TInt i = 0; i < aPatternSequence.Count(); i++)

		{

			TInt index = FindSequence(aPatternSequence[i]);

			if ( index  == KErrNotFound )

			{

				// sequence not found, add it to array

				TPsPatternDetails* temp = new ( ELeave ) TPsPatternDetails;

				TInt len = aPatternSequence[i]->Length();

				temp->matchPattern = HBufC::NewL(len);

				temp->matchPattern->Des().Copy(*(aPatternSequence[i]));

				// First occurence should be -1 for alphabetical sort

				// and pool index will be 0 as only one pool will be created

				temp->firstOccurence = -1;

				temp->poolIndex = 0;

				iMatchPatternDetails.Append(temp);	

			}

		}

	}

	else

	{

		// PatternBased sort

		TInt index = AddToPoolL(psData, aPatternSequence);

		// Increment the total count

		iResultCount++;	

	}

}

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

// CPcsAlgorithm1FilterHelper::AddToPoolL

// 

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

TInt CPcsAlgorithm1FilterHelper::AddToPoolL(CPsData* psData, 

											RPointerArray<TDesC>& aPatternSequence)

{

    // Sort the pattern sequence

    TLinearOrder<TDesC> rule( CPcsAlgorithm1Utils::MyCompareC );

    aPatternSequence.Sort(rule);

    // Sort rule        

	TLinearOrder<CPsData> psDataRule( CPcsAlgorithm1Utils::CompareDataBySortOrderL );

	// Search Rule

	TIdentityRelation<CPsData> identitySearchRule(CPsData::CompareById);

	TInt poolItemCount = -1;

	TInt matchpatterpoolIndexToAppend = -1;

	for(TInt cnt=0; cnt <aPatternSequence.Count(); cnt++ )

	{

		// Create the pattern for aPatternSequence[cnt] in  iMatchPatternDetails

		// and return the index

	    TInt indexInMatchPatternDetails = CreateMatchPatternDetailsAndPoolsL(aPatternSequence[cnt]);

		//Add the data to the pool the first pattern pool.

		// The data should be added only once

		if(cnt == 0)

	    {

	    	TInt poolIndex = iMatchPatternDetails[indexInMatchPatternDetails]->poolIndex;

	    	matchpatterpoolIndexToAppend = indexInMatchPatternDetails;

	       	iMatchPatternPools[poolIndex]->InsertInOrderAllowRepeats(psData, psDataRule);

	       	TInt findposition = iMatchPatternPools[poolIndex]->Find(psData,identitySearchRule) ;

	       	if ( findposition != KErrNotFound )

	       	{

	       		poolItemCount = findposition;

	       	}

	       	else

	       	{

	       		poolItemCount = -1;

	       	}	

	    }

	    else if(cnt > 0)

		{

		    // Check if aPatternSequence[cnt] is listed in subpatterns of aPatternSequence[0]

		    // If not, then create a sub pattern and apped it to  iMatchPatternDetails for aPatternSequence[0]

		 	TInt subSeq = FindSubSequence(aPatternSequence[cnt],matchpatterpoolIndexToAppend);

		 	if(subSeq  == KErrNotFound )

		 	{

		 		//Create the subpattern and append it.

			 	TPsSubPattern* tempSubPattern = new ( ELeave ) TPsSubPattern;

				tempSubPattern->matchPattern = HBufC::NewL(aPatternSequence[cnt]->Length());

				tempSubPattern->matchPattern->Des().Copy(*(aPatternSequence[cnt]));

				tempSubPattern->firstOccurenceInThisPattern = poolItemCount; 

			 	iMatchPatternDetails[matchpatterpoolIndexToAppend]->subPatternArray.AppendL(tempSubPattern);

		 	}

		}

	}

	return 0;

}

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

// CPcsAlgorithm1FilterHelper::CreateMatchPatternDetailsAndPoolsL

// Creates the Matchpattern aSeq in  iMatchPatternDetails.

// Returns the index of the sequence in iMatchPatternDetails

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

TInt CPcsAlgorithm1FilterHelper::CreateMatchPatternDetailsAndPoolsL(TDesC* aSeq)

{

	TInt indexInMatchPatternDetails = FindSequence(aSeq);

	if ( indexInMatchPatternDetails  == KErrNotFound )

	{	

		// sequence not found, add it to array

		TPsPatternDetails* tempPatternDetailsInstance = new ( ELeave ) TPsPatternDetails;

		//TInt len = aPatternSequence[cnt]->Length();

		tempPatternDetailsInstance->matchPattern = HBufC::NewL(aSeq->Length());

		tempPatternDetailsInstance->matchPattern->Des().Copy(*(aSeq));

		tempPatternDetailsInstance->firstOccurence = -1; //RAVIKIRAN

		// Pools doesn't exist for this sequence..

		RPointerArray<CPsData> *tempPsDataArray = new (ELeave) RPointerArray<CPsData> ();

        tempPatternDetailsInstance->poolIndex  = iMatchPatternPools.Count();

        iMatchPatternDetails.Append(tempPatternDetailsInstance);

        iMatchPatternPools.Append(tempPsDataArray);

        return (iMatchPatternDetails.Count() - 1);

	}

	else

	{

		// Pool already exists for this sequence, get the correct index and add the result

		return indexInMatchPatternDetails; 

	}

}

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

// CPcsAlgorithm1FilterHelper::GetResults

// 

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

void CPcsAlgorithm1FilterHelper::GetResults(RPointerArray<CPsData>& aSearchResults)

{

	// No results, simply return

	if(iResultCount == -1)

		return;

	// Sort sequences

	TLinearOrder<TPsPatternDetails> rule( ComparePsPattern );

	iMatchPatternDetails.Sort(rule);

	if(iSortType == EAlphabetical)

	{

		// Return the results stored in single array

		for(TInt i = 0; i < iMatchPatternPools[0]->Count(); i++)

			aSearchResults.Append((*(iMatchPatternPools[0]))[i]);

		// Clear the match pattern pool for the next data store

		iMatchPatternPools[0]->Reset();

	}

	else

	{

		TInt firstOccurenceTracker = 0;

		for(TInt i = 0; i < iMatchPatternDetails.Count(); i++)

		{

		    // Get the mapping pool index for this sequence

			TInt index = iMatchPatternDetails[i]->poolIndex;

			TInt j = 0;

			for(; j < iMatchPatternPools[index]->Count(); j++)

			{

				aSearchResults.Append((*(iMatchPatternPools[index]))[j]);

			}

			// Check the sub patterns

			for(TInt k =0 ; k < iMatchPatternDetails[i]->subPatternArray.Count(); k++)

			{

				HBufC* temporseq = iMatchPatternDetails[i]->subPatternArray[k]->matchPattern;

				TRAP_IGNORE( UpdateForSubSequencesL( *temporseq,

				    firstOccurenceTracker + 

				    iMatchPatternDetails[i]->subPatternArray[k]->firstOccurenceInThisPattern ) );

			}

			if(iMatchPatternDetails[i]->firstOccurence == -1)

				iMatchPatternDetails[i]->firstOccurence = firstOccurenceTracker;	

			firstOccurenceTracker = firstOccurenceTracker + j;

		}

	}

}

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

// CPcsAlgorithm1FilterHelper::GetPatternsL

// 

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

void CPcsAlgorithm1FilterHelper::GetPatternsL(RPointerArray<CPsPattern>& aPatternSet)

{

	// Sort sequences

	TLinearOrder<TPsPatternDetails> rule( ComparePsPattern );

	iMatchPatternDetails.Sort(rule);

	for(TInt i = 0; i < iMatchPatternDetails.Count(); i++)

	{

		CPsPattern *tempPattern = CPsPattern::NewL();

		// Copy the sequence

		tempPattern->SetPatternL(*(iMatchPatternDetails[i]->matchPattern));

		tempPattern->SetFirstIndex(iMatchPatternDetails[i]->firstOccurence);

		aPatternSet.Append(tempPattern);

	}

}

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

// CPcsAlgorithm1FilterHelper::FindSequence

// Searches for for aSeq in iMatchPatternDetails and returns index 

//  where input sequence is found. Returns -1 if not found

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

TInt CPcsAlgorithm1FilterHelper::FindSequence(TDesC* aSeq)

{

	TBuf<50> seqBuf;

	seqBuf.Append(*aSeq);

	TInt j = 0;

	for( ; j < iMatchPatternDetails.Count(); j++)

	{

		TBuf<50> matchPatternBuf;

		matchPatternBuf.Copy((iMatchPatternDetails[j]->matchPattern->Des()));

		if ( CPcsAlgorithm1Utils::MyCompareC(seqBuf, matchPatternBuf) == 0 )

            break;

	}

	if( j == iMatchPatternDetails.Count())

		return KErrNotFound;

	else

		return j;

}

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

// CPcsAlgorithm1FilterHelper::FindSubSequence

// Searches for for seq in subpatterns of iMatchPatternDetails[aPatternIndex]

// and returns index where input sequence is found. 

// Returns -1 if not found

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

TInt CPcsAlgorithm1FilterHelper::FindSubSequence(TDesC* aSeq,TInt aPatternIndex)

{

	TBuf<50> seqBuf;

	seqBuf.Append(*aSeq);

	TInt j = 0;

	for( ; j < iMatchPatternDetails[aPatternIndex]->subPatternArray.Count(); j++)

	{

		TBuf<50> matchPatternBuf;

		matchPatternBuf.Copy((iMatchPatternDetails[aPatternIndex]->subPatternArray[j]->matchPattern->Des()));

		if ( CPcsAlgorithm1Utils::MyCompareC(seqBuf, matchPatternBuf) == 0 )

            break;

	}

	if( j == iMatchPatternDetails[aPatternIndex]->subPatternArray.Count())

		return KErrNotFound;

	else

		return j;

}

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

// CPcsAlgorithm1FilterHelper::UpdateForSubSequencesL

// Searches for all the subsequences of aSeq and updates the aFirstOccrVal in 

// iMatchPatternDetails.

//

// For ex: if aSeq = "ABC" and aFirstOccrVal= 2, 

// then, firstOccurence of all substring sequences ("A", "AB", "ABC") 

//       in iMatchPatternDetails will be set to 2

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

void CPcsAlgorithm1FilterHelper::UpdateForSubSequencesL(TDesC& aSeq,TInt aFirstOccrVal)

{

    HBufC* tempSequence = HBufC::NewL(aSeq.Length() + 1);

    for ( TInt i =0; i<aSeq.Length(); i++ )

	{

	    // Get the next substring in tempSequence

		tempSequence->Des().Append(aSeq[i]);

		// Find if this sequence exist in iMatchPatternDetails

		TInt patternIndex = FindSequence(tempSequence);

		//If the sequence exits and firstOccurence == -1, then set it to aFirstOccrVal 

		if((patternIndex != KErrNotFound) && (iMatchPatternDetails[patternIndex]->firstOccurence == -1))

		{

			iMatchPatternDetails[patternIndex]->firstOccurence = aFirstOccrVal;

		}	

	}

	delete tempSequence;

	tempSequence = NULL;

	return;

}

// END OF FILE