/*

* 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:  smiely engine class

*

*/

#include "smileymanager.h"

#include "smileymodel.h"

const TText KSpace = ' ';

const TInt KLinkIndexMark = 0x8000;

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

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

// CSmileyInfo::CSmileyInfo

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

//

CSmileyInfo::CSmileyInfo()

    {    

    }

CSmileyInfo::~CSmileyInfo()

    {

    iStrArray.Reset();

    iStrArray.Close();

    }

void CSmileyInfo::Reset()

    {

    iImageInfo.Reset();

    iStrArray.Reset();

    }

void CSmileyInfo::SetSmileyText( const TDesC& aText )

    {

    TInt startIndex( KErrNotFound );

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

        {

        if ( ( i == aText.Length() || aText[i] == KSpace ) && 

            startIndex != KErrNotFound )

            {

            iStrArray.Append( aText.Mid( startIndex, i - startIndex ) );

            startIndex = KErrNotFound;

            }

        if ( startIndex == KErrNotFound && i < aText.Length() && 

            aText[i] != KSpace )

            {

            startIndex = i;

            }

        }

    }

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

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

// TImageInfo::TImageInfo

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

//

TImageInfo::TImageInfo() : iCode( 0 ), iBmpId( 0 ), iMaskId( 0 ),

    iIsAnimation( EFalse ), iStaticBmpId( 0 ), iStaticMaskId( 0 )

    {    

    }

void TImageInfo::Reset()

    {

    iCode = iBmpId = iMaskId = iStaticBmpId = iStaticMaskId = 0;

    iIsAnimation = EFalse;

    }

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

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

// CSmileyModel::TLinkToImage::TLinkToImage

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

//

CSmileyModel::TLinkToImage::TLinkToImage() : iStrLength( 0 ),

    iStrNode( KInvalidIndex ), iImageIndex( KInvalidIndex )

    {    

    }

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

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

// CSmileyModel::TStrNode::TStrNode

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

//

CSmileyModel::TStrNode::TStrNode() : iCode(0), iSibling( KInvalidIndex ), 

    iChild( KInvalidIndex ), iParent( KInvalidIndex )

    {    

    }

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

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

// CSmileyModel::CSmileyModel

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

//

CSmileyModel::CSmileyModel()    

    {    

    }

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

// CSmileyModel::~CSmileyModel

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

//

CSmileyModel::~CSmileyModel()

    {

    Reset();

    iStrArray.Close();

    iImageInfoArray.Close();

    iLinkArray.Close();

    delete iFileName;  

    }

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

// CSmileyModel::Reset

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

//

void CSmileyModel::Reset()

    {

    iStrArray.Reset();

    iStrArray.Compress();

    iImageInfoArray.Reset();

    iImageInfoArray.Compress();

    iLinkArray.Reset();

    iLinkArray.Compress();

    delete iFileName;

    iFileName = NULL;

    }

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

// CSmileyModel::SetSmileyIconFileL

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

// 

void CSmileyModel::SetSmileyIconFileL( const TDesC& aIconFileName )

    {

    if ( aIconFileName.Length() > 0 )

        {

        delete iFileName;

        iFileName = NULL;

        iFileName = HBufC::NewL( aIconFileName.Length() );

        TPtr ptr( iFileName->Des() );

        ptr.Copy( aIconFileName );

        }

    }

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

// CSmileyModel::SupportedCodesL

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

//    

HBufC* CSmileyModel::SupportedCodesL()

    {

    HBufC* codes( NULL );

    if ( iImageInfoArray.Count() > 0 )

        {

        codes = HBufC::NewL( iImageInfoArray.Count() );

        TPtr ptr( codes->Des() );

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

            {

            if ( ptr.Locate( iImageInfoArray[i].iCode ) == KErrNotFound )

                {

                ptr.Append( iImageInfoArray[i].iCode );                                

                }

            }

        }

    return codes;

    }

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

// CSmileyModel::GetImageInfo

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

//

void CSmileyModel::GetImageInfo( TImageInfo& aImageInfo, HBufC** aFileName )

    {

    TInt count( iImageInfoArray.Count() );

    if ( count == 0 )

        {

        aFileName = NULL;

        aImageInfo.Reset();

        return;

        }

    for ( TInt i = 0; i < count; i++ )

        {

        if ( iImageInfoArray[i].iCode == aImageInfo.iCode )

            {

            aImageInfo = iImageInfoArray[i];

            *aFileName = iFileName;

            }

        }

    }

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

// CSmileyModel::AddSimleyL

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

//

void CSmileyModel::AddSimleyL( CSmileyInfo& aInfo )

    {

        aInfo.iStrArray.Count() == 0 )

        {

        return;

        }

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

        {

        TInt imageIndex = AddLinkAndImageInfoL( aInfo, i );

        AddStringL( aInfo, imageIndex, i );

        }    

    }

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

// CSmileyModel::AddLinkAndImageInfoL

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

//

TInt CSmileyModel::AddLinkAndImageInfoL( CSmileyInfo& aInfo, TInt aStrIndex )

    {

    TLinkToImage link;

    for ( TInt i( 0 ); i < iImageInfoArray.Count(); i++ )

        {

        if ( iImageInfoArray[i].iCode == aInfo.iImageInfo.iCode )

            {

            link.iImageIndex = i;

            break;

            }

        }

    if ( link.iImageIndex == KInvalidIndex )

        {

        link.iImageIndex = iImageInfoArray.Count();

        iImageInfoArray.Append( aInfo.iImageInfo );

        }

    link.iStrLength = aInfo.iStrArray[aStrIndex].Length();

    iLinkArray.Append( link );

    return ( iLinkArray.Count() - 1 );

    }

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

// CSmileyModel::AddStringL

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

//

void CSmileyModel::AddStringL( CSmileyInfo& aInfo, TInt aLinkIndex, 

    TInt aStrIndex )

    {       

    TInt index( KInvalidIndex );    

    for ( TInt i = 0; i < aInfo.iStrArray[aStrIndex].Length(); i++ )

        {        

        TStrNode str; 

        str.iCode = aInfo.iStrArray[aStrIndex][i];

        index = AddStrNodeL( index, str );                               

        }

    iStrArray[index].iChild = ( KLinkIndexMark | aLinkIndex );

    iLinkArray[aLinkIndex].iStrNode = index;    

    }

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

// CSmileyModel::AddStrNodeL

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

//

TInt CSmileyModel::AddStrNodeL( TInt aIndex, TStrNode& aNode )

    {    

    TInt count = iStrArray.Count();

    if ( count > 0 )

        {        

        TInt child( aIndex == KInvalidIndex ? 0 : 

            iStrArray[aIndex].iChild );

        if ( child != KInvalidIndex )

            {            

            TInt index = FindInSibling( child, aNode.iCode );

            if ( index != KInvalidIndex )

                {

                return index;

                }

            iStrArray[child].iSibling = count;            

            }

        else

            {

            iStrArray[aIndex].iChild = count;

            }

        }

    aNode.iParent = aIndex;

    iStrArray.Append( aNode );

    return count;

    }

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

// CSmileyModel::FindInSibling

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

//

TInt CSmileyModel::FindInSibling( TInt& aIndex, TText aCode )

    {

    TInt ret( KInvalidIndex );

    if ( iStrArray.Count() > 0 )

        {

        TInt index( aIndex == KInvalidIndex ? 0 : aIndex );

        while ( index != KInvalidIndex )

            {

            if ( iStrArray[index].iCode == aCode )

                {

                ret = index;

                break;

                }

            aIndex = index;

            index = iStrArray[index].iSibling;

            }        

        }

    return ret;

    }

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

// CSmileyModel::FindInSibling

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

//

TBool CSmileyModel::IsFinalNode( TInt aIndex )

    {

    return ( aIndex != KInvalidIndex && 

        ( iStrArray[aIndex].iChild & KLinkIndexMark ) != 0 );

    }

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

// CSmileyModel::FindMatchStr

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

//

TInt CSmileyModel::TryFindMatchNode( const TDesC& aText, TInt aTextPos )

    {

    TInt index( 0 );

    index = FindInSibling( index, aText[aTextPos] );

    TInt textPos( aTextPos + 1 );

    while ( index != KInvalidIndex && !IsFinalNode( index ) && 

        textPos < aText.Length() )

        {            

        index = iStrArray[index].iChild;

        index = FindInSibling( index, aText[textPos] );

        if ( index != KInvalidIndex )

            {

            textPos++;

            }

        }

    return index;

    }

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

// CSmileyModel::SmileyStringLength

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

//

TInt CSmileyModel::SmileyStringLength( TInt aNodeIndex )

    {

    if ( IsFinalNode( aNodeIndex ) )

        {

        TInt linkIndex( iStrArray[aNodeIndex].iChild & ~KLinkIndexMark );

        return iLinkArray[linkIndex].iStrLength;

        }

    return 0;

    }

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

// CSmileyModel::SmileyCode

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

//

TText CSmileyModel::SmileyCode( TInt aNodeIndex )

    {

    TInt linkIndex( iStrArray[aNodeIndex].iChild & ~KLinkIndexMark );

    TInt imageIndex( iLinkArray[linkIndex].iImageIndex );

    return iImageInfoArray[imageIndex].iCode;

    }

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

// CSmileyModel::ReplaceTextWithCodes

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

//

void CSmileyModel::ReplaceTextWithCodes( TDes& aText, TInt aDocPos, 

    TInt aNodeIndex )

    {

    TInt linkIndex( iStrArray[aNodeIndex].iChild & ~KLinkIndexMark );

    TInt len( iLinkArray[linkIndex].iStrLength );

    TInt imageIndex( iLinkArray[linkIndex].iImageIndex );

    aText[aDocPos] = iImageInfoArray[imageIndex].iCode;

    const TInt KThirdIndex = 2;

    for ( TInt i( KThirdIndex ); i < len; i++ )

        {

        }

    }

/////////////////////////////////////////////////////////////////////////////////////////

const char KStartSymbol[] = {'(', '<', '[', '{'};

const char KEndSymbol[] = {')', '>', ']', '}'};

TInt IndexFrom(const char* const aPtr, TInt aLength, TInt aChar)

    {

    for(TInt i=0; i<aLength; i++)

        {

        if(aPtr[i] == aChar) return i;

        }

    return KErrNotFound;

    }

TBool HavePairedSymbol(const TDesC& aText, TInt aSmileyLength)

    {

    char stack[CSmileyManager::KMaxLength];

    TInt pos = 0;

    TInt i = aText.Length() - 1;

    const TInt smileyPos = aText.Length() - aSmileyLength;

    for(TInt i=aText.Length()-1; i>=0; i--)

        {

        TInt index = IndexFrom(KEndSymbol, sizeof(KEndSymbol), aText[i]); // detect end symbol

        if(KErrNotFound != index) // push

            {

            stack[pos++] = KStartSymbol[index];

            }

        else if(pos) // detect start symbol

            {

            if(stack[pos-1] == aText[i]) // meet a start symbol

                {

                pos--;

                if(!pos) return (smileyPos > i);

                }

            }

        if(smileyPos == i) // smiley combination finished

            {

            if(!pos) return EFalse;

            }

        }

    return EFalse;

    }

TBool IsPartOfUrl(const TDesC& aText)

    {

    const TInt end = aText.Length() - 1;

    TInt pos = end;

    while(pos > 0)

        {

        const TUint16 word = aText[--pos];

        if(word == ' ' || word == 0x2029)

            {

            break;

            }

        }

    TInt length = end - pos;

    if(length > 5)

        {

        TPtrC field(aText.Mid(pos,length));

        pos = field.Find(_L(":\\\\"));

        if(KErrNotFound == pos) pos = field.Find(_L("://"));

        if(KErrNotFound != pos)

            {

            return ETrue;

            }    

        }

    return EFalse;

    }

TBool CSmileyModel::IsSmileyBySemanticAnalysis(const TDesC& aText, TInt aSmileyLength)

    {

    if(HavePairedSymbol(aText, aSmileyLength)) return EFalse;

    if(IsPartOfUrl(aText)) return EFalse;

    return ETrue;

    }