/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_lingucomponent.hxx"

#include <com/sun/star/uno/Reference.h>
#include <com/sun/star/linguistic2/XSearchableDictionaryList.hpp>

#include <com/sun/star/linguistic2/SpellFailure.hpp>
#include <cppuhelper/factory.hxx>	// helper for factories
#include <com/sun/star/registry/XRegistryKey.hpp>
#include <tools/debug.hxx>
#include <unotools/processfactory.hxx>
#include <osl/mutex.hxx>

#include <lingutil.hxx>
#include <hunspell.hxx>
#include <sspellimp.hxx>

#include <linguistic/lngprops.hxx>
#include <linguistic/spelldta.hxx>
#include <i18npool/mslangid.hxx>
#include <unotools/pathoptions.hxx>
#include <unotools/lingucfg.hxx>
#include <unotools/useroptions.hxx>
#include <osl/file.hxx>
#include <rtl/ustrbuf.hxx>
#include <rtl/textenc.h>

#include <list>
#include <set>
#include <string.h>

using namespace utl;
using namespace osl;
using namespace rtl;
using namespace com::sun::star;
using namespace com::sun::star::beans;
using namespace com::sun::star::lang;
using namespace com::sun::star::uno;
using namespace com::sun::star::linguistic2;
using namespace linguistic;

// XML-header of SPELLML queries
#define SPELLML_HEADER "<?xml?>"

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

SpellChecker::SpellChecker() :
	aEvtListeners	( GetLinguMutex() )
{
    aDicts = NULL;
	aDEncs = NULL;
	aDLocs = NULL;
	aDNames = NULL;
	bDisposing = sal_False;
	pPropHelper = NULL;
    numdict = 0;
}


SpellChecker::~SpellChecker()
{
    if (aDicts) 
    {
       for (int i = 0; i < numdict; i++) 
       {
            if (aDicts[i]) delete aDicts[i];
            aDicts[i] = NULL;
       }
       delete[] aDicts;
    }
    aDicts = NULL;
    numdict = 0;
    if (aDEncs) delete[] aDEncs;
    aDEncs = NULL;
    if (aDLocs) delete[] aDLocs;
    aDLocs = NULL;
    if (aDNames) delete[] aDNames;
    aDNames = NULL;
    if (pPropHelper)
        pPropHelper->RemoveAsPropListener();
}


PropertyHelper_Spell & SpellChecker::GetPropHelper_Impl()
{
	if (!pPropHelper)
	{
		Reference< XPropertySet	>	xPropSet( GetLinguProperties(), UNO_QUERY );

		pPropHelper	= new PropertyHelper_Spell( (XSpellChecker *) this, xPropSet );
		xPropHelper = pPropHelper;
		pPropHelper->AddAsPropListener();	//! after a reference is established
	}
	return *pPropHelper;
}


Sequence< Locale > SAL_CALL SpellChecker::getLocales()
		throw(RuntimeException)
{
    MutexGuard  aGuard( GetLinguMutex() );

    // this routine should return the locales supported by the installed
    // dictionaries.

    if (!numdict)
    {
        SvtLinguConfig aLinguCfg;

        // get list of extension dictionaries-to-use
		// (or better speaking: the list of dictionaries using the
		// new configuration entries).
        std::list< SvtLinguConfigDictionaryEntry > aDics;
        uno::Sequence< rtl::OUString > aFormatList;
        aLinguCfg.GetSupportedDictionaryFormatsFor( A2OU("SpellCheckers"),
                A2OU("org.openoffice.lingu.MySpellSpellChecker"), aFormatList );
        sal_Int32 nLen = aFormatList.getLength();
        for (sal_Int32 i = 0;  i < nLen;  ++i)
        {
            std::vector< SvtLinguConfigDictionaryEntry > aTmpDic(
                    aLinguCfg.GetActiveDictionariesByFormat( aFormatList[i] ) );
            aDics.insert( aDics.end(), aTmpDic.begin(), aTmpDic.end() );
        }

        //!! for compatibility with old dictionaries (the ones not using extensions
        //!! or new configuration entries, but still using the dictionary.lst file)
		//!! Get the list of old style spell checking dictionaries to use...
        std::vector< SvtLinguConfigDictionaryEntry > aOldStyleDics(
				GetOldStyleDics( "DICT" ) );

		// to prefer dictionaries with configuration entries we will only
		// use those old style dictionaries that add a language that
		// is not yet supported by the list od new style dictionaries
		MergeNewStyleDicsAndOldStyleDics( aDics, aOldStyleDics );

        numdict = aDics.size();
        if (numdict)
        {
            // get supported locales from the dictionaries-to-use...
            sal_Int32 k = 0;
            std::set< rtl::OUString, lt_rtl_OUString > aLocaleNamesSet;
            std::list< SvtLinguConfigDictionaryEntry >::const_iterator aDictIt;
            for (aDictIt = aDics.begin();  aDictIt != aDics.end();  ++aDictIt)
            {
                uno::Sequence< rtl::OUString > aLocaleNames( aDictIt->aLocaleNames );
                sal_Int32 nLen2 = aLocaleNames.getLength();
                for (k = 0;  k < nLen2;  ++k)
                {
                    aLocaleNamesSet.insert( aLocaleNames[k] );
                }
            }
            // ... and add them to the resulting sequence
            aSuppLocales.realloc( aLocaleNamesSet.size() );
            std::set< rtl::OUString, lt_rtl_OUString >::const_iterator aItB;
            k = 0;
            for (aItB = aLocaleNamesSet.begin();  aItB != aLocaleNamesSet.end();  ++aItB)
            {
				Locale aTmp( MsLangId::convertLanguageToLocale(
						MsLangId::convertIsoStringToLanguage( *aItB )));
                aSuppLocales[k++] = aTmp;
            }

            //! For each dictionary and each locale we need a seperate entry.
            //! If this results in more than one dictionary per locale than (for now)
			//! it is undefined which dictionary gets used.
			//! In the future the implementation should support using several dictionaries
			//! for one locale.
			numdict = 0;
            for (aDictIt = aDics.begin();  aDictIt != aDics.end();  ++aDictIt)
				numdict = numdict + aDictIt->aLocaleNames.getLength();

            // add dictionary information
            aDicts  = new Hunspell* [numdict];
            aDEncs  = new rtl_TextEncoding [numdict];
            aDLocs  = new Locale [numdict];
            aDNames = new OUString [numdict];
            k = 0;
            for (aDictIt = aDics.begin();  aDictIt != aDics.end();  ++aDictIt)
            {
                if (aDictIt->aLocaleNames.getLength() > 0 &&
                    aDictIt->aLocations.getLength() > 0)
                {
                    uno::Sequence< rtl::OUString > aLocaleNames( aDictIt->aLocaleNames );
                    sal_Int32 nLocales = aLocaleNames.getLength();

                    // currently only one language per dictionary is supported in the actual implementation...
                    // Thus here we work-around this by adding the same dictionary several times.
                    // Once for each of it's supported locales.
                    for (sal_Int32 i = 0;  i < nLocales;  ++i)
                    {
                        aDicts[k]  = NULL;
                        aDEncs[k]  = RTL_TEXTENCODING_DONTKNOW;
                        aDLocs[k]  = MsLangId::convertLanguageToLocale(
                                        MsLangId::convertIsoStringToLanguage( aLocaleNames[i] ));
                        // also both files have to be in the same directory and the
                        // file names must only differ in the extension (.aff/.dic).
                        // Thus we use the first location only and strip the extension part.
                        rtl::OUString aLocation = aDictIt->aLocations[0];
                        sal_Int32 nPos = aLocation.lastIndexOf( '.' );
                        aLocation = aLocation.copy( 0, nPos );
                        aDNames[k] = aLocation;

                        ++k;
                    }
                }
            }
            DBG_ASSERT( k == numdict, "index mismatch?" );
        }
        else
        {
            /* no dictionary found so register no dictionaries */
            numdict = 0;
            aDicts  = NULL;
            aDEncs  = NULL;
            aDLocs  = NULL;
            aDNames = NULL;
            aSuppLocales.realloc(0);
        }
    }

	return aSuppLocales;
}


sal_Bool SAL_CALL SpellChecker::hasLocale(const Locale& rLocale)
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	sal_Bool bRes = sal_False;
	if (!aSuppLocales.getLength())
		getLocales();

	sal_Int32 nLen = aSuppLocales.getLength();
	for (sal_Int32 i = 0;  i < nLen;  ++i)
	{
		const Locale *pLocale = aSuppLocales.getConstArray();
		if (rLocale == pLocale[i])
		{
			bRes = sal_True;
			break;
		}
	}
	return bRes;
}


sal_Int16 SpellChecker::GetSpellFailure( const OUString &rWord, const Locale &rLocale )
{
    Hunspell * pMS = NULL;
    rtl_TextEncoding eEnc = RTL_TEXTENCODING_DONTKNOW;

	// initialize a myspell object for each dictionary once
    // (note: mutex is held higher up in isValid)

	sal_Int16 nRes = -1;

    // first handle smart quotes both single and double
	OUStringBuffer rBuf(rWord);
    sal_Int32 n = rBuf.getLength();
    sal_Unicode c;
    for (sal_Int32 ix=0; ix < n; ix++) 
    {
	    c = rBuf.charAt(ix);
        if ((c == 0x201C) || (c == 0x201D)) 
            rBuf.setCharAt(ix,(sal_Unicode)0x0022);
        if ((c == 0x2018) || (c == 0x2019)) 
            rBuf.setCharAt(ix,(sal_Unicode)0x0027);
    }
    OUString nWord(rBuf.makeStringAndClear());

	if (n)
	{
        for (sal_Int32 i = 0; i < numdict; ++i) 
        {
            pMS = NULL;
            eEnc = RTL_TEXTENCODING_DONTKNOW;

            if (rLocale == aDLocs[i])
            {
                if (!aDicts[i])
                {
                    OUString dicpath = aDNames[i] + A2OU(".dic");
                    OUString affpath = aDNames[i] + A2OU(".aff");
                    OUString dict;
                    OUString aff;
                    osl::FileBase::getSystemPathFromFileURL(dicpath,dict);
                    osl::FileBase::getSystemPathFromFileURL(affpath,aff);
                    OString aTmpaff(OU2ENC(aff,osl_getThreadTextEncoding()));
                    OString aTmpdict(OU2ENC(dict,osl_getThreadTextEncoding()));

#if defined(WNT)
                    // workaround for Windows specifc problem that the
                    // path length in calls to 'fopen' is limted to somewhat
                    // about 120+ characters which will usually be exceed when
                    // using dictionaries as extensions.
                    aTmpaff = Win_GetShortPathName( aff );
                    aTmpdict = Win_GetShortPathName( dict );
#endif

                    aDicts[i] = new Hunspell(aTmpaff.getStr(),aTmpdict.getStr());
                    aDEncs[i] = RTL_TEXTENCODING_DONTKNOW;
                    if (aDicts[i]) 
                        aDEncs[i] = getTextEncodingFromCharset(aDicts[i]->get_dic_encoding());
                }
                pMS = aDicts[i];
                eEnc = aDEncs[i];
            }
        
            if (pMS)
            {
                // we don't want to work with a default text encoding since following incorrect
                // results may occur only for specific text and thus may be hard to notice.
                // Thus better always make a clean exit here if the text encoding is in question.
                // Hopefully something not working at all will raise proper attention quickly. ;-)
                DBG_ASSERT( eEnc != RTL_TEXTENCODING_DONTKNOW, "failed to get text encoding! (maybe incorrect encoding string in file)" );
                if (eEnc == RTL_TEXTENCODING_DONTKNOW)
                    return -1;

                OString aWrd(OU2ENC(nWord,eEnc));
                int rVal = pMS->spell((char*)aWrd.getStr());
                if (rVal != 1)
                    nRes = SpellFailure::SPELLING_ERROR;
                else 
                    return -1;
                pMS = NULL;
            }
        }
	}

	return nRes;
}


sal_Bool SAL_CALL SpellChecker::isValid( const OUString& rWord, const Locale& rLocale,
			const PropertyValues& rProperties )
		throw(IllegalArgumentException, RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

 	if (rLocale == Locale()  ||  !rWord.getLength())
		return sal_True;

	if (!hasLocale( rLocale ))
#ifdef LINGU_EXCEPTIONS
		throw( IllegalArgumentException() );
#else
		return sal_True;
#endif

	// return sal_False to process SPELLML requests (they are longer than the header)
	if (rWord.match(A2OU(SPELLML_HEADER), 0) && (rWord.getLength() > 10)) return sal_False;

	// Get property values to be used.
	// These are be the default values set in the SN_LINGU_PROPERTIES
	// PropertySet which are overridden by the supplied ones from the
	// last argument.
	// You'll probably like to use a simplier solution than the provided
	// one using the PropertyHelper_Spell.

	PropertyHelper_Spell &rHelper = GetPropHelper();
	rHelper.SetTmpPropVals( rProperties );

	sal_Int16 nFailure = GetSpellFailure( rWord, rLocale );
	if (nFailure != -1 && !rWord.match(A2OU(SPELLML_HEADER), 0))
	{
		sal_Int16 nLang = LocaleToLanguage( rLocale );
		// postprocess result for errors that should be ignored
        const bool bIgnoreError = 
                (!rHelper.IsSpellUpperCase()  && IsUpper( rWord, nLang )) ||
                (!rHelper.IsSpellWithDigits() && HasDigits( rWord )) ||
                (!rHelper.IsSpellCapitalization()  &&  nFailure == SpellFailure::CAPTION_ERROR);
        if (bIgnoreError)
            nFailure = -1;
	}

	return (nFailure == -1);
}


Reference< XSpellAlternatives >
	SpellChecker::GetProposals( const OUString &rWord, const Locale &rLocale )
{
	// Retrieves the return values for the 'spell' function call in case
	// of a misspelled word.
	// Especially it may give a list of suggested (correct) words:

	Reference< XSpellAlternatives > xRes;
    // note: mutex is held by higher up by spell which covers both

    Hunspell* pMS = NULL;
    rtl_TextEncoding eEnc = RTL_TEXTENCODING_DONTKNOW;
    int count = 0;
    int numsug = 0;

    // first handle smart quotes (single and double)
	OUStringBuffer rBuf(rWord);
    sal_Int32 n = rBuf.getLength();
    sal_Unicode c;
    for (sal_Int32 ix=0; ix < n; ix++) 
    {
        c = rBuf.charAt(ix);
        if ((c == 0x201C) || (c == 0x201D)) 
            rBuf.setCharAt(ix,(sal_Unicode)0x0022);
        if ((c == 0x2018) || (c == 0x2019)) 
            rBuf.setCharAt(ix,(sal_Unicode)0x0027);
    }
    OUString nWord(rBuf.makeStringAndClear());

	if (n)
	{
        sal_Int16 nLang = LocaleToLanguage( rLocale );

	    Sequence< OUString > aStr( 0 );

        for (int i =0; i < numdict; i++) 
        {
            pMS = NULL;
            eEnc = RTL_TEXTENCODING_DONTKNOW;
            count = 0;

            if (rLocale == aDLocs[i])
            {
                pMS = aDicts[i];
                eEnc = aDEncs[i];
            }

	        if (pMS)
	        {
                char ** suglst = NULL;
                OString aWrd(OU2ENC(nWord,eEnc));
                count = pMS->suggest(&suglst, (const char *) aWrd.getStr());

                if (count) 
                {
                    aStr.realloc( numsug + count );
                    OUString *pStr = aStr.getArray();
                    for (int ii=0; ii < count; ++ii)
                    {
                        OUString cvtwrd(suglst[ii],strlen(suglst[ii]),eEnc);
                        pStr[numsug + ii] = cvtwrd;
                    }
                    pMS->free_list(&suglst, count);
                    numsug += count;
                }
            }
	    }

        // now return an empty alternative for no suggestions or the list of alternatives if some found
	    SpellAlternatives *pAlt = new SpellAlternatives;
        String aTmp(rWord);
	    pAlt->SetWordLanguage( aTmp, nLang );
	    pAlt->SetFailureType( SpellFailure::SPELLING_ERROR );
	    pAlt->SetAlternatives( aStr );
	    xRes = pAlt;
        return xRes;
	}
    return xRes;
}


Reference< XSpellAlternatives > SAL_CALL SpellChecker::spell( 
        const OUString& rWord, const Locale& rLocale,
        const PropertyValues& rProperties )
		throw(IllegalArgumentException, RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

 	if (rLocale == Locale()  ||  !rWord.getLength())
		return NULL;

	if (!hasLocale( rLocale ))
#ifdef LINGU_EXCEPTIONS
		throw( IllegalArgumentException() );
#else
		return NULL;
#endif

	Reference< XSpellAlternatives > xAlt;
	if (!isValid( rWord, rLocale, rProperties ))
	{
		xAlt =  GetProposals( rWord, rLocale );
	}
	return xAlt;
}


Reference< XInterface > SAL_CALL SpellChecker_CreateInstance(
        const Reference< XMultiServiceFactory > & /*rSMgr*/ )
        throw(Exception)
{

	Reference< XInterface > xService = (cppu::OWeakObject*) new SpellChecker;
	return xService;
}


sal_Bool SAL_CALL SpellChecker::addLinguServiceEventListener(
        const Reference< XLinguServiceEventListener >& rxLstnr )
        throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	sal_Bool bRes = sal_False;
	if (!bDisposing && rxLstnr.is())
	{
		bRes = GetPropHelper().addLinguServiceEventListener( rxLstnr );
	}
	return bRes;
}


sal_Bool SAL_CALL SpellChecker::removeLinguServiceEventListener(
        const Reference< XLinguServiceEventListener >& rxLstnr )
        throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	sal_Bool bRes = sal_False;
	if (!bDisposing && rxLstnr.is())
	{
		DBG_ASSERT( xPropHelper.is(), "xPropHelper non existent" );
		bRes = GetPropHelper().removeLinguServiceEventListener( rxLstnr );
	}
	return bRes;
}


OUString SAL_CALL SpellChecker::getServiceDisplayName( const Locale& /*rLocale*/ )
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );
	return A2OU( "Hunspell SpellChecker" );
}


void SAL_CALL SpellChecker::initialize( const Sequence< Any >& rArguments )
		throw(Exception, RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	if (!pPropHelper)
	{
		sal_Int32 nLen = rArguments.getLength();
		if (2 == nLen)
		{
			Reference< XPropertySet	>	xPropSet;
			rArguments.getConstArray()[0] >>= xPropSet;
			//rArguments.getConstArray()[1] >>= xDicList;

			//! Pointer allows for access of the non-UNO functions.
			//! And the reference to the UNO-functions while increasing
			//! the ref-count and will implicitly free the memory
			//! when the object is not longer used.
			pPropHelper = new PropertyHelper_Spell( (XSpellChecker *) this, xPropSet );
			xPropHelper = pPropHelper;
			pPropHelper->AddAsPropListener();	//! after a reference is established
		}
        else 
        {
			DBG_ERROR( "wrong number of arguments in sequence" );
        }
	}
}


void SAL_CALL SpellChecker::dispose()
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	if (!bDisposing)
	{
		bDisposing = sal_True;
		EventObject	aEvtObj( (XSpellChecker *) this );
		aEvtListeners.disposeAndClear( aEvtObj );
	}
}


void SAL_CALL SpellChecker::addEventListener( const Reference< XEventListener >& rxListener )
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	if (!bDisposing && rxListener.is())
		aEvtListeners.addInterface( rxListener );
}


void SAL_CALL SpellChecker::removeEventListener( const Reference< XEventListener >& rxListener )
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	if (!bDisposing && rxListener.is())
		aEvtListeners.removeInterface( rxListener );
}


///////////////////////////////////////////////////////////////////////////
// Service specific part
//

OUString SAL_CALL SpellChecker::getImplementationName()
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	return getImplementationName_Static();
}


sal_Bool SAL_CALL SpellChecker::supportsService( const OUString& ServiceName )
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	Sequence< OUString > aSNL = getSupportedServiceNames();
	const OUString * pArray = aSNL.getConstArray();
	for( sal_Int32 i = 0; i < aSNL.getLength(); i++ )
		if( pArray[i] == ServiceName )
			return sal_True;
	return sal_False;
}


Sequence< OUString > SAL_CALL SpellChecker::getSupportedServiceNames()
		throw(RuntimeException)
{
	MutexGuard	aGuard( GetLinguMutex() );

	return getSupportedServiceNames_Static();
}


Sequence< OUString > SpellChecker::getSupportedServiceNames_Static()
		throw()
{
	MutexGuard	aGuard( GetLinguMutex() );

	Sequence< OUString > aSNS( 1 );	// auch mehr als 1 Service moeglich
	aSNS.getArray()[0] = A2OU( SN_SPELLCHECKER );
	return aSNS;
}

void * SAL_CALL SpellChecker_getFactory( const sal_Char * pImplName,
			XMultiServiceFactory * pServiceManager, void *  )
{
	void * pRet = 0;
	if ( !SpellChecker::getImplementationName_Static().compareToAscii( pImplName ) )
	{
		Reference< XSingleServiceFactory > xFactory =
			cppu::createOneInstanceFactory(
				pServiceManager,
				SpellChecker::getImplementationName_Static(),
				SpellChecker_CreateInstance,
				SpellChecker::getSupportedServiceNames_Static());
		// acquire, because we return an interface pointer instead of a reference
		xFactory->acquire();
		pRet = xFactory.get();
	}
	return pRet;
}


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