/*
    This file is part of libtdeabc.
    Copyright (c) 2003 Tobias Koenig <tokoe@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include <tqregexp.h>
#include <tqtextcodec.h>

#include <kmdcodec.h>

#include "vcardparser.h"

#define FOLD_WIDTH 75

using namespace TDEABC;

static TQString backslash( "\\\\" );
static TQString comma( "\\," );
static TQString newline( "\\n" );
static TQString cr( "\\r" );

static void addEscapes( TQString &str )
{
  str.replace( '\\', backslash );
  str.replace( ',', comma );
  str.replace( '\r', cr );
  str.replace( '\n', newline );
}

static void removeEscapes( TQString &str )
{
  str.replace( cr, "\\r" );
  str.replace( newline, "\n" );
  str.replace( comma, "," );
  str.replace( backslash, "\\" );
}

VCardParser::VCardParser()
{
}

VCardParser::~VCardParser()
{
}

VCard::List VCardParser::parseVCards( const TQString& text )
{
  static TQRegExp sep( "[\x0d\x0a]" );

  VCard currentVCard;
  VCard::List vCardList;
  TQString currentLine;

  const TQStringList lines = TQStringList::split( sep, text );
  TQStringList::ConstIterator it;

  bool inVCard = false;
  TQStringList::ConstIterator linesEnd( lines.end() );
  for ( it = lines.begin(); it != linesEnd; ++it ) {

    if ( (*it).isEmpty() ) // empty line
      continue;

    if ( (*it)[ 0 ] == ' ' || (*it)[ 0 ] == '\t' ) { // folded line => append to previous
      currentLine += TQString( *it ).remove( 0, 1 );
      continue;
    } else {
      if ( inVCard && !currentLine.isEmpty() ) { // now parse the line
        int colon = currentLine.find( ':' );
        if ( colon == -1 ) { // invalid line
          currentLine = (*it);
          continue;
        }

        VCardLine vCardLine;
        const TQString key = currentLine.left( colon ).stripWhiteSpace();
        TQString value = currentLine.mid( colon + 1 );

        TQStringList params = TQStringList::split( ';', key );

        // check for group
        if ( params[0].find( '.' ) != -1 ) {
          const TQStringList groupList = TQStringList::split( '.', params[0] );
          vCardLine.setGroup( groupList[0] );
          vCardLine.setIdentifier( groupList[1] );
        } else
          vCardLine.setIdentifier( params[0] );

        if ( params.count() > 1 ) { // find all parameters
          TQStringList::ConstIterator paramIt = params.begin();
          for ( ++paramIt; paramIt != params.end(); ++paramIt ) {
            TQStringList pair = TQStringList::split( '=', *paramIt );
            if ( pair.size() == 1 ) {
              // correct the 2.1 'standard'
              if ( pair[0].lower() == "quoted-printable" ) {
                pair[0] = "encoding";
                pair[1] = "quoted-printable";
              } else if ( pair[0].lower() == "base64" ) {
                pair[0] = "encoding";
                pair[1] = "base64";
              } else {
                pair.prepend( "type" );
              }
            }
            // This is pretty much a faster pair[1].contains( ',' )...
            if ( pair[1].find( ',' ) != -1 ) { // parameter in type=x,y,z format
              const TQStringList args = TQStringList::split( ',', pair[ 1 ] );
              TQStringList::ConstIterator argIt;
              for ( argIt = args.begin(); argIt != args.end(); ++argIt )
                vCardLine.addParameter( pair[0].lower(), *argIt );
            } else
              vCardLine.addParameter( pair[0].lower(), pair[1] );
          }
        }

        removeEscapes( value );

        TQByteArray output;
        bool wasBase64Encoded = false;

        params = vCardLine.parameterList();
        if ( params.findIndex( "encoding" ) != -1 ) { // have to decode the data
          TQByteArray input;
          input = TQCString(value.latin1());
          if ( vCardLine.parameter( "encoding" ).lower() == "b" ||
               vCardLine.parameter( "encoding" ).lower() == "base64" ) {
            KCodecs::base64Decode( input, output );
            wasBase64Encoded = true;
          }
          else if ( vCardLine.parameter( "encoding" ).lower() == "quoted-printable" ) {
            // join any qp-folded lines
            while ( value.at( value.length() - 1 ) == '=' && it != linesEnd ) {
              value = value.remove( value.length() - 1, 1 ) + (*it);
              ++it;
            }
            input = TQCString(value.latin1());
            KCodecs::quotedPrintableDecode( input, output );
          }
        } else { //assume it's in UTF-8 (as used in previous KDE versions)
          output = TQCString(value.utf8());
        }

        if ( params.findIndex( "charset" ) != -1 ) { // have to convert the data
          TQTextCodec *codec =
            TQTextCodec::codecForName( vCardLine.parameter( "charset" ).latin1() );
          if ( codec ) {
            vCardLine.setValue( codec->toUnicode( output ) );
          } else {
            vCardLine.setValue( TQString(TQString::fromUtf8( output )) );
          }
        } else if ( wasBase64Encoded ) {
            vCardLine.setValue( output );
        } else {  // if charset not given, assume it's in UTF-8 (as used in previous KDE versions)
            vCardLine.setValue( TQString(TQString::fromUtf8( output )) );
        }

        currentVCard.addLine( vCardLine );
      }

      // we do not save the start and end tag as vcardline
      if ( (*it).lower().startsWith( "begin:vcard" ) ) {
        inVCard = true;
        currentLine.setLength( 0 );
        currentVCard.clear(); // flush vcard
        continue;
      }

      if ( (*it).lower().startsWith( "end:vcard" ) ) {
        inVCard = false;
        vCardList.append( currentVCard );
        currentLine.setLength( 0 );
        currentVCard.clear(); // flush vcard
        continue;
      }

      currentLine = (*it);
    }
  }

  return vCardList;
}

TQString VCardParser::createVCards( const VCard::List& list )
{
  TQString text;
  TQString textLine;
  TQString encodingType;
  TQStringList idents;
  TQStringList params;
  TQStringList values;
  TQStringList::ConstIterator identIt;
  TQStringList::Iterator paramIt;
  TQStringList::ConstIterator valueIt;

  VCardLine::List lines;
  VCardLine::List::ConstIterator lineIt;
  VCard::List::ConstIterator cardIt;

  bool hasEncoding;

  text.reserve( list.size() * 300 ); // reserve memory to be more efficient

  // iterate over the cards
  VCard::List::ConstIterator listEnd( list.end() );
  for ( cardIt = list.begin(); cardIt != listEnd; ++cardIt ) {
    text.append( "BEGIN:VCARD\r\n" );

    idents = (*cardIt).identifiers();
    for ( identIt = idents.constBegin(); identIt != idents.constEnd(); ++identIt ) {
      lines = (*cardIt).lines( (*identIt) );

      // iterate over the lines
      for ( lineIt = lines.constBegin(); lineIt != lines.constEnd(); ++lineIt ) {
        if ( !(*lineIt).value().asString().isEmpty() ) {
          if ((*lineIt).identifier() != TQString("URI")) {
            if ( (*lineIt).hasGroup() )
              textLine = (*lineIt).group() + "." + (*lineIt).identifier();
            else
              textLine = (*lineIt).identifier();

            params = (*lineIt).parameterList();
            hasEncoding = false;
            if ( params.count() > 0 ) { // we have parameters
              for ( paramIt = params.begin(); paramIt != params.end(); ++paramIt ) {
                if ( (*paramIt) == "encoding" ) {
                  hasEncoding = true;
                  encodingType = (*lineIt).parameter( "encoding" ).lower();
                }

                values = (*lineIt).parameters( *paramIt );
                for ( valueIt = values.constBegin(); valueIt != values.constEnd(); ++valueIt ) {
                  textLine.append( ";" + (*paramIt).upper() );
                  if ( !(*valueIt).isEmpty() )
                    textLine.append( "=" + (*valueIt) );
                }
              }
            }

            if ( hasEncoding ) { // have to encode the data
              TQByteArray input, output;
              if ( encodingType == "b" ) {
                input = (*lineIt).value().toByteArray();
                KCodecs::base64Encode( input, output );
              } else if ( encodingType == "quoted-printable" ) {
                input = (*lineIt).value().toString().utf8();
                input.resize( input.size() - 1 ); // strip \0
                KCodecs::quotedPrintableEncode( input, output, false );
              }

              TQString value( output );
              addEscapes( value );
              textLine.append( ":" + value );
            } else {
              TQString value( (*lineIt).value().asString() );
              addEscapes( value );
              textLine.append( ":" + value );
            }

            if ( textLine.length() > FOLD_WIDTH ) { // we have to fold the line
              for ( uint i = 0; i <= ( textLine.length() / FOLD_WIDTH ); ++i )
                text.append( ( i == 0 ? "" : " " ) + textLine.mid( i * FOLD_WIDTH, FOLD_WIDTH ) + "\r\n" );
            } else
            text.append( textLine + "\r\n" );
          }
          else {
            // URIs can be full of weird symbols, etc. so bypass all checks
            textLine = (*lineIt).identifier();
            TQString value( (*lineIt).value().asString() );
            addEscapes( value );
            textLine.append( ":" + value );
            text.append( textLine + "\r\n" );
          }
        }
      }
    }

    text.append( "END:VCARD\r\n" );
    text.append( "\r\n" );
  }

  return text;
}