/*
 *  FeatureArray.cpp
 *  met - Minimum Error Training
 *
 *  Created by Nicola Bertoldi on 13/05/08.
 *
 */

#include "FeatureArray.h"
#include "FileStream.h"
#include "Util.h"


FeatureArray::FeatureArray()
    : idx(""), number_of_features(0), _sparse_flag(false) {}

FeatureArray::~FeatureArray() {}

void FeatureArray::savetxt(std::ofstream& outFile)
{
  outFile << FEATURES_TXT_BEGIN << " " << idx << " " << array_.size()
          << " " << number_of_features << " " << features << std::endl;
  for (featarray_t::iterator i = array_.begin(); i !=array_.end(); i++) {
    i->savetxt(outFile);
    outFile << std::endl;
  }
  outFile << FEATURES_TXT_END << std::endl;
}

void FeatureArray::savebin(std::ofstream& outFile)
{
  outFile << FEATURES_BIN_BEGIN << " " << idx << " " << array_.size()
          << " " << number_of_features << " " << features << std::endl;
  for (featarray_t::iterator i = array_.begin(); i !=array_.end(); i++)
    i->savebin(outFile);

  outFile << FEATURES_BIN_END << std::endl;
}


void FeatureArray::save(std::ofstream& inFile, bool bin)
{
  if (size()>0)
    (bin)?savebin(inFile):savetxt(inFile);
}

void FeatureArray::save(const std::string &file, bool bin)
{

  std::ofstream outFile(file.c_str(), std::ios::out); // matches a stream with a file. Opens the file

  save(outFile);

  outFile.close();
}

void FeatureArray::loadbin(ifstream& inFile, size_t n)
{
  FeatureStats entry(number_of_features);

  for (size_t i=0 ; i < n; i++) {
    entry.loadbin(inFile);
    add(entry);
  }
}

void FeatureArray::loadtxt(ifstream& inFile, size_t n)
{
  FeatureStats entry(number_of_features);

  for (size_t i=0 ; i < n; i++) {
    entry.loadtxt(inFile);
    add(entry);
    if (entry.getSparse().size()>0)
      _sparse_flag = true;
  }
}

void FeatureArray::load(ifstream& inFile)
{
  size_t number_of_entries=0;
  bool binmode=false;

  std::string substring, stringBuf;
  std::string::size_type loc;

  std::getline(inFile, stringBuf);
  if (!inFile.good()) {
    return;
  }

  if (!stringBuf.empty()) {
    if ((loc = stringBuf.find(FEATURES_TXT_BEGIN)) == 0) {
      binmode=false;
    } else if ((loc = stringBuf.find(FEATURES_BIN_BEGIN)) == 0) {
      binmode=true;
    } else {
      TRACE_ERR("ERROR: FeatureArray::load(): Wrong header");
      return;
    }
    getNextPound(stringBuf, substring);
    getNextPound(stringBuf, substring);
    idx = substring;
    getNextPound(stringBuf, substring);
    number_of_entries = atoi(substring.c_str());
    getNextPound(stringBuf, substring);
    number_of_features = atoi(substring.c_str());
    features = stringBuf;
  }

  (binmode)?loadbin(inFile, number_of_entries):loadtxt(inFile, number_of_entries);

  std::getline(inFile, stringBuf);
  if (!stringBuf.empty()) {
    if ((loc = stringBuf.find(FEATURES_TXT_END)) != 0 && (loc = stringBuf.find(FEATURES_BIN_END)) != 0) {
      TRACE_ERR("ERROR: FeatureArray::load(): Wrong footer");
      return;
    }
  }
}

void FeatureArray::load(const std::string &file)
{
  TRACE_ERR("loading data from " << file << std::endl);

  inputfilestream inFile(file); // matches a stream with a file. Opens the file

  load((ifstream&) inFile);

  inFile.close();

}

void FeatureArray::merge(FeatureArray& e)
{
  //dummy implementation
  for (size_t i=0; i<e.size(); i++)
    add(e.get(i));
}

bool FeatureArray::check_consistency() const
{
  const size_t sz = NumberOfFeatures();
  if (sz == 0)
    return true;

  for (featarray_t::const_iterator i = array_.begin(); i != array_.end(); i++) {
    if (i->size() != sz)
      return false;
  }
  return true;
}