// -*- mode: c++ -*- 
/* 

    GIFT, a flexible content based image retrieval system.
    Copyright (C) 1998, 1999, 2000, 2001, 2002, CUI University of Geneva

     Copyright (C) 2003, 2004 Bayreuth University
      2005 Bamberg University
    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
/**
 *
 * Do we print the initialisation?
 *
 */

#define _NO_PRINT_INIT
#include <iostream>
#include <cstdio>
#include "libMRML/include/my_throw.h"
#include "libMRML/include/GIFTExceptions.h"
#include "libMRML/include/mrml_const.h"
#include "libGIFTAcURL2FTS/include/CAcURL2FTS.h"
#include "libMRML/include/CXMLElement.h" // constructor
//the expat xml parser by J.Clark
//#include "expat/xmlparse/xmlparse.h"
#include <expat.h>

extern CMutex* gMutex;

#define USE_FLATFILE 0

void newStartURL2FTSElement(void *inUserData, 
			    const char *inElementName, 
			    const char **inAttributes){
  
  CAcURL2FTS* lAccessor=(CAcURL2FTS*)inUserData;
  
  //cout << inElementName << endl;

  string lElementName(inElementName);
  CAttributeList lAttributes(inAttributes);

  if(lElementName=="image-list"){
    lAccessor->mID=0;
    lAccessor->mURLPrefix=string("");
    lAccessor->mThumbnailURLPrefix=string("");
    if(lAttributes.stringReadAttribute("url-prefix").first){
      lAccessor->mURLPrefix=lAttributes.stringReadAttribute("url-prefix").second;
    }
    if(lAttributes.stringReadAttribute("thumbnail-url-prefix").first){
      lAccessor->mThumbnailURLPrefix=lAttributes.stringReadAttribute("thumbnail-url-prefix").second;
    }
  }
  if(lElementName=="image"){
    string lURL=lAccessor->mURLPrefix+lAttributes.stringReadAttribute("url-postfix").second;
    string lThumbnailURL=lAccessor->mThumbnailURLPrefix+lAttributes.stringReadAttribute("thumbnail-url-postfix").second;
    string lFeatureFileName=lAttributes.stringReadAttribute("feature-file-name").second;
    
    lAccessor->mURLToFFN.insert(make_pair(lURL,lFeatureFileName));
    lAccessor->mIDToFFN.insert(make_pair(lAccessor->mID,lFeatureFileName));
    lAccessor->mURLToID.insert(make_pair(lURL,lAccessor->mID));
    lAccessor->mIDToAccessorElement.insert(make_pair(lAccessor->mID,CAccessorElement(lAccessor->mID,
									  lURL,
									  lThumbnailURL,
									  lFeatureFileName)));
    lAccessor->mID++;

    //cout << lURL << endl;
    //cout << lThumbnailURL << endl;
    //cout << lFeatureFileName << endl;
  }
}
void newEndURL2FTSElement(void *inUserData, 
			  const char *inElementName){
}

CAcURL2FTS::CAcURL2FTS(const CXMLElement& inCollectionElement):
  mURLToFeatureFileName(inCollectionElement.stringReadAttribute(mrml_const::cui_base_dir).second
			+inCollectionElement.stringReadAttribute(mrml_const::cui_feature_file_location).second),
  mURLToFeatureFile((inCollectionElement.stringReadAttribute(mrml_const::cui_base_dir).second
                     +inCollectionElement.stringReadAttribute(mrml_const::cui_feature_file_location).second).c_str())
{
  gMutex->lock();

  cout << endl
       << "Opening "
       << mURLToFeatureFileName;
  if(!mURLToFeatureFile)
    cout <<" ...FAILED!";
  else
    cout << " ...success." 
	 << endl;
  
  mWellConstructed=(bool)mURLToFeatureFile;
  
  mURLToFFN.clear();
  mURLToID.clear();
  mIDToFFN.clear();
  mIDToAccessorElement.clear();
  
  
  int lID=0;
  if(USE_FLATFILE){
    
    /* as long as there is no end of file */
    while(mURLToFeatureFile){
      string lURL;
      string lThumbnailURL;
      string lFeatureFileName;
      
      /* read in the URLs of all the images with the corresponding feature file */



      mURLToFeatureFile >> lURL
			>> lThumbnailURL
			>> lFeatureFileName;
      

      if(lURL.size()>4){
#ifndef _NO_PRINT_INIT
	cout << lID 
	     << ": URL            " << lURL << flush << endl
	     << " Thumbnail       " << lThumbnailURL << flush << endl
	     << " FeatureFileName " << lThumbnailURL << flush << endl;
#endif

	mURLToFFN.insert(make_pair(lURL,lFeatureFileName));
	mIDToFFN.insert(make_pair(lID,lFeatureFileName));
	mURLToID.insert(make_pair(lURL,lID));
	mIDToAccessorElement.insert(make_pair(lID,CAccessorElement(lID,
								   lURL,
								   lThumbnailURL,
								   lFeatureFileName)));
	lID++;
      }
    }
  }else{// use an XML parser
    cout << "constructing parser" << endl;
    XML_Parser lParser = XML_ParserCreate(NULL);//default encoding
    XML_SetUserData(lParser,
		    this);
    XML_SetElementHandler(lParser, 
			  newStartURL2FTSElement,
			  newEndURL2FTSElement);

    bool lParseError=false;
    string lURL2FTS;

    cout << "Reading " << endl;

    mURLToFeatureFile.seekg(0,ios::end);
    int lFileSize(mURLToFeatureFile.tellg());
    mURLToFeatureFile.seekg(0,ios::beg);

    cout << lFileSize 
	 << " characters" 
	 << endl;

    char* lBuffer=new char[lFileSize+1];
    mURLToFeatureFile.read(lBuffer,lFileSize);
    lBuffer[lFileSize]=char(0);

    cout << "Read url2fts.xml" << endl;
    
    bool lDone=false;
    for(int i=0;
	i<=lFileSize/10000;
	i++){
      if (!XML_Parse(lParser,
		     lBuffer+i*10000,
		     (lFileSize-i*10000<10000)
		     ?lFileSize-i*10000:10000,
		     lDone)
	  ) {
	cerr << "libGIFTAcURL2FTS/cc/CAcURL2FTS.cc:" << __LINE__ << ": XML ERROR: "
	     << XML_ErrorString(XML_GetErrorCode(lParser))
	     << " at line "
	     << XML_GetCurrentLineNumber(lParser)
	     << endl;
	char lLine[10];
	sprintf(lLine,"%d",__LINE__);

	my_throw(new VEConfigurationError(string(string("libGIFTAcURL2FTS/cc/CAcURL2FTS.cc:") 
						 + string(lLine)
						 + string("Could not read file ") 
						 + string(mURLToFeatureFileName))
				      .c_str()));
      }
    }
    cout << "Successfully processed" << endl;
    delete lBuffer;
    XML_ParserFree(lParser);
  }



  cout << "URLFile " 
       << mURLToFeatureFileName 
       << " processed."
       << endl;
  mURLToFeatureFile.close();
  gMutex->unlock();
};
CAcURL2FTS::operator bool()const{
  return mWellConstructed;
}
  /** gives back the content of mURLToFeatureFileName */
const string& CAcURL2FTS::getURLToFeatureFileName()const{
  return mURLToFeatureFileName;
};


int CAcURL2FTS::size()const{
  mMutexURL2FTS.lock();
  int lReturnValue(mIDToFFN.size());
  mMutexURL2FTS.unlock();
  return lReturnValue;
};


pair<bool,string> CAcURL2FTS::URLToFFN(const string& inURL)const{
  mMutexURL2FTS.lock();
  string_string_map::const_iterator lFound=mURLToFFN.find(inURL);

  if(lFound != mURLToFFN.end()){
    pair<bool,string> lReturnValue(make_pair(true,lFound->second));
    mMutexURL2FTS.unlock();
    return lReturnValue;
  }else{
    // should be false here??
    pair<bool,string> lReturnValue(make_pair(true,string(inURL+"does not exsist")));
    mMutexURL2FTS.unlock();
    return lReturnValue;
  }
};

pair<bool,string> CAcURL2FTS::IDToFFN(TID inID)const{
  mMutexURL2FTS.lock();
  TID_string_map::const_iterator lFound=mIDToFFN.find(inID);


  if(lFound != mIDToFFN.end()){
    pair<bool,string> lReturnValue(make_pair(true,lFound->second));
    mMutexURL2FTS.unlock();
    return lReturnValue;
  }else{
    pair<bool,string> lReturnValue(make_pair(true,string("the requested id does not exsist")));
    mMutexURL2FTS.unlock();
    return lReturnValue;
  }
};