/* ****************************************************************************
  This file is part of KBabel

  Copyright (C) 2000 by Matthias Kiefer
                            <matthias.kiefer@gmx.de>
		2002 by Stanislav Visnovsky
			    <visnovsky@kde.org>

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

  This program 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

  In addition, as a special exception, the copyright holders give
  permission to link the code of this program with any edition of
  the TQt library by Trolltech AS, Norway (or with modified versions
  of TQt that use the same license as TQt), and distribute linked
  combinations including the two.  You must obey the GNU General
  Public License in all respects for all of the code used other than
  TQt. If you modify this file, you may extend this exception to
  your version of the file, but you are not obligated to do so.  If
  you do not wish to do so, delete this exception statement from
  your version.

**************************************************************************** */
#include <klocale.h>
#include <kapplication.h>
#include <kcmdlineargs.h>
#include <kstaticdeleter.h>
#include <kdebug.h>
#include <kglobal.h>
#include <kinstance.h>
#include <tdeio/netaccess.h>

#include <tqtextstream.h>
#include <tqtimer.h>

#include "tmxcompendiumdata.h"
#include "tmxcompendium.h"
#include "preferenceswidget.h"
#include "pc_factory.h"

#include <catalogitem.h>

// ngram length and minimal matching for fuzzy search
#define NGRAM_LEN 3
#define LIM_NGRAM 50  

static KStaticDeleter< TQDict<TmxCompendiumData> > compDataDeleter;
TQDict<TmxCompendiumData> *TmxCompendium::_compDict = 0;

TmxCompendium::TmxCompendium(TQObject *parent, const char *name)
        : SearchEngine(parent, name)
{
    prefWidget=0;
    data=0;
    error=false;
    stop=false;
    active=false;
    initialized=false;
    loading=false;

    langCode = TDEGlobal::locale()->language();

    caseSensitive = false;
    wholeWords=true;

    matchEqual = true;
    matchNGram = true;
    matchIsContained = false;
    matchContains = true;
    matchWords=true;


    loadTimer = new TQTimer(this);
    connect(loadTimer,TQT_SIGNAL(timeout()),this,TQT_SLOT(slotLoadCompendium()));
}

TmxCompendium::~TmxCompendium()
{
    if(isSearching())
    {
        stopSearch();
    }

    unregisterData();
}

bool TmxCompendium::isReady() const
{
    return (isSearching() || !error);
}


bool TmxCompendium::isSearching() const
{
    return (active || loading);
}


void TmxCompendium::saveSettings(TDEConfigBase *config)
{
    if(autoUpdate && prefWidget && prefWidget->settingsChanged())
    {
        applySettings();
    }
        
    config->writeEntry("CaseSensitive",caseSensitive);
    config->writeEntry("WholeWords", wholeWords);

    config->writeEntry("MatchEqual", matchEqual);
    config->writeEntry("MatchIsContained",matchIsContained);
    config->writeEntry("MatchContains", matchContains);
    config->writeEntry("MatchWords", matchWords);
    config->writeEntry("MatchNGram", matchNGram);  

    config->writeEntry("Compendium", url);
}

void TmxCompendium::readSettings(TDEConfigBase *config)
{    
    caseSensitive = config->readBoolEntry("CaseSensitive", false);
    wholeWords = config->readBoolEntry("WholeWords",true);

    matchEqual = config->readBoolEntry("MatchEqual", true);
    matchIsContained = config->readBoolEntry("MatchIsContained", false);
    matchContains = config->readBoolEntry("MatchContains",true);
    matchWords = config->readBoolEntry("MatchWords",true);
    matchNGram = config->readBoolEntry("MatchNGram",true);  

    TQString newPath = config->readEntry("Compendium","http://i18n.kde.org/po_overview/@LANG@.messages");
    if(!initialized)
    {
        url = newPath;
    }
    else if(newPath != url)
    {
        url = newPath;
        loadCompendium();
    }

            
    restoreSettings();
}

PrefWidget *TmxCompendium::preferencesWidget(TQWidget *parent)
{
    prefWidget = new TmxCompendiumPreferencesWidget(parent,"tmxcompendium_prefwidget");
    connect(prefWidget, TQT_SIGNAL(applySettings()), this, TQT_SLOT(applySettings()));
    connect(prefWidget, TQT_SIGNAL(restoreSettings())
                    , this, TQT_SLOT(restoreSettings()));

    restoreSettings();
    
    return prefWidget;
}

const TDEAboutData *TmxCompendium::about() const
{
    return PcFactory::instance()->aboutData();
}


TQString TmxCompendium::name() const
{
    return i18n("TMX Compendium");
}

TQString TmxCompendium::id() const
{
    return "tmxcompendium";
}

TQString TmxCompendium::lastError()
{
    return errorMsg;
}


bool TmxCompendium::startSearch(const TQString& text, uint pluralForm, const SearchFilter*)
{
    if(autoUpdate && prefWidget && prefWidget->settingsChanged())
    {
        applySettings();
    }
 
    if(isSearching())
        return false;

    clearResults();
    stop = false;
    active = true;

    if(!initialized)
    {
        if(loadTimer->isActive())
            loadTimer->stop();

        slotLoadCompendium();
    }
    
    if(error || !data)
    {
        active = false;
        return false;
    }

    if(data->active())
    {
        active = false;
        return true;
    }
   
    emit started();


    TQValueList<int> foundIndices;
    TQValueList<int> checkedIndices;
    uint checkCounter=0;
    
    const int *index = data->exactDict(text);
    if(index)
    {
        foundIndices.append(*index);

        SearchResult *result = new SearchResult;
        result->requested = text;
        result->found = data->msgid(*index);
        result->translation = data->msgstr(*index);
        result->score = 100;

        TranslationInfo *info = new TranslationInfo;
        info->location = directory(realURL,0);
        info->translator = TQString();
        info->description = TQString();
        result->descriptions.append(info);

        results.append(result);

        emit numberOfResultsChanged(results.count());
        emit resultFound(result);
    }

    TQString searchStr=TmxCompendiumData::simplify(text);
    
           
    if(!caseSensitive)
    {
         searchStr = searchStr.lower();
    }

    TQString temp = searchStr;
    temp = temp.lower();

    const TQValueList<int> *indexList = data->allDict(temp);
    if(indexList)
    {
        TQValueList<int>::ConstIterator it;
        for( it = indexList->begin(); it != indexList->end(); ++it )
        {
            if(foundIndices.contains(*it))
            {
                continue;
            }

            TQString origStr = data->msgid(*it);
            origStr = TmxCompendiumData::simplify(origStr);
        
           
            if(!caseSensitive)
            {
                origStr = origStr.lower();
            }

            if(origStr==searchStr)
            {
                foundIndices.append(*it);

                SearchResult *result = new SearchResult;
                result->requested = text;
                result->found = data->msgid(*it);
                result->translation = data->msgstr(*it);
		// FIXME: handle plural forms properly
                result->score = score(result->requested,result->found.first());

                TranslationInfo *info = new TranslationInfo;
                info->location = directory(realURL,0);
                info->translator = TQString();
                info->description = TQString();
                result->descriptions.append(info);
 
                addResult(result);
            }
        }
    }
 
    TQStringList wList = TmxCompendiumData::wordList(searchStr);
    for ( TQStringList::Iterator wit = wList.begin()
               ; wit != wList.end(); ++wit ) 
    {
        if(stop)
            break;

        indexList = data->wordDict((*wit).lower());
        if(indexList)
        {
            TQValueList<int>::ConstIterator it;
            for( it = indexList->begin(); it != indexList->end(); ++it )
            {
                if(stop)
                    break;
                
                if(foundIndices.contains(*it))
                {
                    continue;
                }
              
                if(checkedIndices.contains(*it))
                {
                    continue;
                }
                
                checkedIndices.append(*it);
                checkCounter++;

                if( (100*(checkCounter+1))%data->numberOfEntries() < 100)
                {
                    emit progress( (100*(checkCounter+1))/data->numberOfEntries());
                }
            
                kapp->processEvents(100);

                TQString origStr = data->msgid(*it);
                origStr = TmxCompendiumData::simplify(origStr);

           
                if(!caseSensitive)
                {
                    origStr = origStr.lower();
                }

                bool found = false;
                if(matchWords)
                {
                    if(!caseSensitive)
                    {
                        found=true;
                    }
                    else
                    {
                        TQString s=*wit;
                        TQString o=origStr;
                        
                        if(wholeWords)
                        {
                            s=" "+*wit+" ";
                            o=" "+origStr+" ";
                        }
                        if(o.contains(s))
                        {
                            found=true;
                        }
                    }
                }

                
                if(!found && origStr==searchStr)
                {
                    found =true;
                }
                 
                // if there is an string which just contains ignored characters,
                // continue
                if(!found && origStr.isEmpty() || 
                    (origStr.length() == 1 && text.length() > 1))
                {
                    continue;
                }
            

                if(!found && matchContains && !wholeWords)
                {
                    TQString s=maskString(searchStr);
                    TQRegExp searchReg(s);

                    if(searchReg.search(origStr) >= 0)
                        found=true;
                }
            
                if(!found && matchIsContained && !wholeWords)
                {
                    TQString s=maskString(origStr);
                    TQRegExp reg(s);

                    if(reg.search(searchStr) >= 0)
                    {
                        found = true;
                    }
                }
                if(!found && matchWords && !wholeWords)
                {
                    TQStringList list = TmxCompendiumData::wordList(searchStr);
                    
                    for ( TQStringList::Iterator wit2 = list.begin()
                       ; wit2 != list.end(); ++wit2 ) 
                    {
                        TQString s=maskString(*wit2);
                        TQRegExp reg(s);

                        if(reg.search(origStr) >= 0)
                        {
                            found = true;
                        }
                    }
                }

                if(found)
                {
                    foundIndices.append(*it);

                    SearchResult *result = new SearchResult;
                    result->requested = text;
                    result->found = data->msgid(*it);
                    result->translation = data->msgstr(*it);
		    // FIXME: handle plural forms properly
                    result->score = score(result->requested,(result->found.first()));

                    TranslationInfo *info = new TranslationInfo;
                    info->location = directory(realURL,0);
                    info->translator = TQString();
                    info->description = TQString();
                    result->descriptions.append(info);
 
                    addResult(result);
                }
            }
        }
    }
 
    
    if( matchNGram || 
	(!wholeWords && (matchContains || matchIsContained || matchWords))
	)
      {
        TQRegExp searchReg;
        if(matchContains)
        {
            TQString s=maskString(searchStr);
            searchReg.setPattern(s);
        }

        
        bool breakLoop=false;
        int i=-1;
        while(!breakLoop)    
        {
            if(stop)
            {
                breakLoop=true;
                break;
            }

            i++;
            
            if(checkedIndices.contains(i))
            {
                continue;
            }

            checkedIndices.append(i);
            checkCounter++;
  
            if(foundIndices.contains(i))
            {
                 continue;
            }
       
            kapp->processEvents(100);

            if(i >= data->numberOfEntries())
            {
                 breakLoop = true;
                 break;
            }
        
            if( (100*(checkCounter+1))%data->numberOfEntries() < 100)
            {
                emit progress( (100*(checkCounter+1))/data->numberOfEntries());
            }

             TQString origStr = data->msgid(i);
             origStr = TmxCompendiumData::simplify(origStr);
            
             if(!caseSensitive)
             {
                 origStr = origStr.lower();
             }

 
            // if there is an string which just contains ignored characters,
            // continue
            if(origStr.isEmpty() || 
                    (origStr.length() == 1 && text.length() > 1))
            {
                continue;
            }
            
            bool found = false;
            if(matchContains && searchReg.search(origStr) >= 0)
            {
                found=true;
            }

                    
            if(!found && matchIsContained)
            {
                TQString s=maskString(origStr);
                TQRegExp reg(s);

                if(reg.search(searchStr) >= 0)
                {
                    found = true;
                }
            }
            if(!found && matchWords)
            {
                TQStringList list = TmxCompendiumData::wordList(searchStr);
                    
                for ( TQStringList::Iterator wit2 = list.begin()
                   ; wit2 != list.end(); ++wit2 ) 
                {
                    TQString s=maskString(*wit2);

                    if(wholeWords)
                    {
                        origStr = " "+origStr+" ";
                        s=" "+s+" ";
                    }
                    TQRegExp reg(s);
                    
                    if(reg.search(origStr) >= 0)
                    {
                        found = true;
                    }
                }
             }

	    if(!found && matchNGram)
	      {
		// to get more results one could
		// interchange searchStr and origStr when
		// the latter is shorter

		found = ( ngramMatch(searchStr,origStr,NGRAM_LEN) 
			  > LIM_NGRAM );
	      }
       
            if(found)
            {
                 foundIndices.append(i);

                 SearchResult *result = new SearchResult;
                 result->requested = text;
                 result->found = data->msgid(i);
                 result->translation = data->msgstr(i);
		 // FIXME: handle plural forms properly
                 result->score = score(result->requested,(result->found.first()));

                 TranslationInfo *info = new TranslationInfo;
                 info->location = directory(realURL,0);
                 info->translator = TQString();
                 info->description = TQString();
                 result->descriptions.append(info);
    
                 addResult(result);
             }
        }
    } 
    
    if( (100*(checkCounter+1))/data->numberOfEntries() < 100 && !stop)
    {
        for(int i=(100*(checkCounter+1))/data->numberOfEntries(); i<=100; i++)
        {
            emit progress(i);
        }
    }
    

    active = false;
    stop = false;
    emit finished();
    
    return true;
}

void TmxCompendium::stopSearch()
{
    stop=true;
}


void TmxCompendium::applySettings()
{    
    if(!prefWidget)
        return;
    
    if(isSearching())
        stopSearch();
    
    caseSensitive = prefWidget->caseSensitive();
    wholeWords = prefWidget->wholeWords();

    matchEqual = prefWidget->matchEqual();
    matchNGram = prefWidget->matchNGram();
    matchIsContained = prefWidget->matchIsContained();
    matchContains = prefWidget->matchContains();
    matchWords = prefWidget->matchWords();

    
    bool needLoading=false;
    
    
    TQString newPath = prefWidget->url();
    if(!initialized)
    {
        url = newPath;
    }
    else if(newPath != url)
    {
        url = newPath;
        needLoading = true;
    }

    if(needLoading)
    {
        loadCompendium();
        initialized=false;
    }
}

void TmxCompendium::restoreSettings()
{
    if(!prefWidget)
        return;
    
    prefWidget->setCaseSensitive(caseSensitive);
    prefWidget->setWholeWords(wholeWords);
    prefWidget->setURL(url);

    prefWidget->setMatchEqual(matchEqual);
    prefWidget->setMatchNGram(matchNGram);
    prefWidget->setMatchIsContained(matchIsContained);
    prefWidget->setMatchContains(matchContains);
    prefWidget->setMatchWords(matchWords);
}
    
void TmxCompendium::loadCompendium()
{
    if(!loading && !loadTimer->isActive())
        loadTimer->start(100,true);
}

void TmxCompendium::slotLoadCompendium()
{
    if(loading)
        return;

    if(loadTimer->isActive())
        loadTimer->stop();
    
    loading = true;

    if(data)
    {
        unregisterData();
    }


    TQString path=url;
   
    if(path.contains("@LANG@"))
    {
        path.replace("@LANG@",langCode);
    }
    KURL u=TDECmdLineArgs::makeURL(path.local8Bit());
    realURL = u.url();
  
    registerData();
    

    if(!data)
    {
        kdError() << "no data object in tmxcompendium?" << endl;

        loading=false;
        return;
    }

    if(!data->initialized())
    {
        if(!data->active())
        {
            data->load(u,langCode);
            recheckData();
            if(error)
            {
                emit hasError(errorMsg);
            }
        }
        else
        {
            connect(data, TQT_SIGNAL(progressEnds()), this, TQT_SLOT(recheckData()));
        }
    }
    else
    {
        recheckData();
        if(error)
        {
            emit hasError(errorMsg);
        }
    }

    initialized=true;
}

void TmxCompendium::recheckData()
{
    if(data)
    {
        disconnect(data, TQT_SIGNAL(progressEnds()), this, TQT_SLOT(recheckData()));

        error = data->hasErrors();
        errorMsg = data->errorMsg();
    }

    loading=false;
}

TQString TmxCompendium::maskString(TQString s) const
{
    s.replace('\\',"\\\\");
    s.replace('?',"\\?");
    s.replace('[',"\\[");
    s.replace('.',"\\.");
    s.replace('*',"\\*");
    s.replace('+',"\\+");
    s.replace('^',"\\^");
    s.replace('$',"\\$");
    s.replace('(',"\\(");
    s.replace(')',"\\)");
    s.replace('{',"\\{");
    s.replace('}',"\\}");
    s.replace('|',"\\|");
    
    return s;
}

void TmxCompendium::addResult(SearchResult *result)
{
    if(results.last() && results.last()->score >= result->score)
    {
        results.append(result);
    }
    else
    {
        SearchResult *sr;
        for(sr = results.first(); sr != 0; sr=results.next())
        {
            if(sr->score < result->score)
            {
                results.insert(results.at(),result);
                emit resultsReordered();
                break;
            }
        }

        if(!sr)
        {
             results.append(result);
        }
    }

    emit numberOfResultsChanged(results.count());
    emit resultFound(result);
}


void TmxCompendium::setLanguageCode(const TQString& lang)
{   
    if(initialized && url.contains("@LANG@") && lang!=langCode 
            && !loadTimer->isActive() )
    {
        initialized=false;
    }
    
    langCode=lang;
}

TQString TmxCompendium::translate(const TQString& text, uint pluralForm)
{
    if(!initialized)
    {
        if(loadTimer->isActive())
            loadTimer->stop();

        slotLoadCompendium();
    }
    
    if(error || !data || data->active())
    {
        return TQString();
    }
   

    const int *index = data->exactDict(text);

    if(index)
    {
        return data->msgstr(*index);
    }
   
    return TQString();
}

TQString TmxCompendium::fuzzyTranslation(const TQString& text, int &score, uint pluralForm)
{
  if(!initialized)
    {
      if(loadTimer->isActive())
	loadTimer->stop();

      slotLoadCompendium();
    }
    
  if(error || !data || data->active())
    {
      return TQString();
    }
    
  // try to find fuzzy string
  bool breakLoop = false;
  stop = false;
  int i=-1;
  int best_matching = -1;
  int best_match = 0;
  int total = data->numberOfEntries();
 
  TQString searchStr = TmxCompendiumData::simplify(text);

  //kdDebug(750) << "find best match for " << searchStr << endl;

  while(!breakLoop)
    {

      // progress and loop control
      if(stop)
	{
	  breakLoop=true;
	  break;
	}

      i++;

      if(i >= total)
	{
	  breakLoop = true;
	  break;
	}

      if( (100*(i+1))%total < 100)
	{
	  emit progress( (100*(i+1))/total);
	}

      // get a message from the catalog
      TQString origStr = data->msgid(i);
      origStr = TmxCompendiumData::simplify(origStr);

      // don't match too long strings for short search string
      if (origStr.length() > 2*searchStr.length())
	continue;
      //      kdDebug(750) << i << ": matching " << origStr << endl;

      int ngram_result = ngramMatch(searchStr,origStr);

      if (ngram_result > best_match) {
	best_match = ngram_result;
	best_matching = i;

	// kdDebug(750) << "[" << ngram_result << "] " << text << "-"
	// << origStr << endl;
      }
    }

  if (best_match > LIM_NGRAM) {
    score = best_match;
    return data->msgstr(best_matching);
  }
 
  return TQString();
}


void TmxCompendium::unregisterData()
{
    if(data)
    { 
        disconnect(data, TQT_SIGNAL(progressStarts(const TQString&)), this
            , TQT_SIGNAL(progressStarts(const TQString&)));
        disconnect(data, TQT_SIGNAL(progressEnds()), this , TQT_SIGNAL(progressEnds()));
        disconnect(data, TQT_SIGNAL(progress(int)), this , TQT_SIGNAL(progress(int)));

        if(data->active())
        {
            disconnect(data,TQT_SIGNAL(progressEnds()),this,TQT_SLOT(recheckData()));
        }

        if(data->unregisterObject(this))
        {
            if(!data->active())
            {
                compendiumDict()->remove(realURL);
            }
            else
            {
                connect(data,TQT_SIGNAL(progressEnds()),this,TQT_SLOT(removeData()));
            }
        }

        data=0;
    }
}

void TmxCompendium::registerData()
{
    data = compendiumDict()->find(realURL);
    if(!data)
    {
        data = new TmxCompendiumData;
        compendiumDict()->insert(realURL,data);
    }

    data->registerObject(this);
    
    if(data->active())
    {
        emit progressStarts(i18n("Loading PO compendium"));
    }
    
    connect(data, TQT_SIGNAL(progressStarts(const TQString&)), this
            , TQT_SIGNAL(progressStarts(const TQString&)));
    connect(data, TQT_SIGNAL(progressEnds()), this , TQT_SIGNAL(progressEnds()));
    connect(data, TQT_SIGNAL(progress(int)), this , TQT_SIGNAL(progress(int)));
}

void TmxCompendium::removeData()
{
    const TQObject *s=TQT_TQOBJECT(const_cast<TQT_BASE_OBJECT_NAME*>(sender()));
    if(s && s->inherits("TmxCompendiumData"))
    {
        const TmxCompendiumData *d=static_cast<const TmxCompendiumData*>(s);
        if(d)
        {
            TQDictIterator<TmxCompendiumData> it(*compendiumDict());
            while(it.current())
            {
                if(it.current() == d)
                {
                    if(!d->hasObjects())
                    {
                        compendiumDict()->remove(it.currentKey());
                    }

                    break;
                }

                ++it;
            }
        }
        
    }
}

TQDict<TmxCompendiumData> *TmxCompendium::compendiumDict()
{
    if(!_compDict)
    {
        _compDict=compDataDeleter.setObject( new TQDict<TmxCompendiumData> );
        _compDict->setAutoDelete(true);
    }

    return _compDict;
}



#include "tmxcompendium.moc"