#include "CLucene/StdHeader.h"
#include "ExactPhraseScorer.h"

#include "PhraseScorer.h"
#include "CLucene/index/Terms.h"

using namespace lucene::index;
namespace lucene{ namespace search{

    ExactPhraseScorer::ExactPhraseScorer(TermPositions** tps, int_t tpsLength, l_byte_t* n, float_t w):
        PhraseScorer(tps, tpsLength, n, w)
    {
        
    }


    float_t ExactPhraseScorer::phraseFreq(){
        // sort list with pq
        for (PhrasePositions* pp = first; pp != NULL; pp = pp->next) {
          pp->firstPosition();
          pq.put(pp);				  // build pq from list
        }
        pqToList();					  // rebuild list from pq
    
        int_t freq = 0;
        do {					  // find position w/ all terms
          while (first->position < last->position) {	  // scan forward in first
    	do {
    	  if (!first->nextPosition())
    	    return (float_t)freq;
    	} while (first->position < last->position);
    	firstToLast();
          }
          freq++;					  // all equal: a match
        } while (last->nextPosition());
      
        return (float_t)freq;
    }
}}