#include <stdexcept>

#include "util/check.hh"
#include "util/exception.hh"

#include "FeatureFunction.h"
#include "moses/Hypothesis.h"
#include "moses/Manager.h"
#include "moses/TranslationOption.h"

using namespace std;

namespace Moses
{

multiset<string> FeatureFunction::description_counts;

std::vector<FeatureFunction*> FeatureFunction::m_producers;
std::vector<const StatelessFeatureFunction*> StatelessFeatureFunction::m_statelessFFs;
std::vector<const StatefulFeatureFunction*>  StatefulFeatureFunction::m_statefulFFs;

FeatureFunction &FeatureFunction::FindFeatureFunction(const std::string& name)
{
  for (size_t i = 0; i < m_producers.size(); ++i) {
	  FeatureFunction &ff = *m_producers[i];
	  if (ff.GetScoreProducerDescription() == name) {
		  return ff;
	  }
  }

  throw "Unknown feature " + name;
}

FeatureFunction::FeatureFunction(const std::string& description, const std::string &line)
  : m_tuneable(true)
{
  Initialize(description, line);
}

FeatureFunction::FeatureFunction(const std::string& description, size_t numScoreComponents, const std::string &line)
  : m_numScoreComponents(numScoreComponents)
  , m_tuneable(true)
{
  Initialize(description, line);
}

void FeatureFunction::Initialize(const std::string& description, const std::string &line)
{
  ParseLine(description, line);

  size_t ind = 0;
  while (ind < m_args.size()) {
	vector<string> &args = m_args[ind];
    bool consumed = OverrideParameter(args[0], args[1]);
    if (consumed) {
    	m_args.erase(m_args.begin() + ind);
    }
    else {
    	++ind;
    }
  }

  if (m_description == "") {
	size_t index = description_counts.count(description);

	ostringstream dstream;
	dstream << description;
	dstream << index;

	description_counts.insert(description);
	m_description = dstream.str();
  }

  ScoreComponentCollection::RegisterScoreProducer(this);
  m_producers.push_back(this);
}

FeatureFunction::~FeatureFunction() {}

void FeatureFunction::ParseLine(const std::string& description, const std::string &line)
{
  vector<string> toks = Tokenize(line);

  CHECK(toks.size());
  //CHECK(toks[0] == description);

  for (size_t i = 1; i < toks.size(); ++i) {
    vector<string> args = Tokenize(toks[i], "=");
    CHECK(args.size() == 2);
    m_args.push_back(args);
  }
}

bool FeatureFunction::OverrideParameter(const std::string& key, const std::string& value)
{
	if (key == "num-features") {
	  m_numScoreComponents = Scan<size_t>(value);
	} else if (key == "name") {
	  m_description = value;
	} else if (key == "tuneable") {
	  m_tuneable = Scan<bool>(value);
	} else {
	  //UTIL_THROW(util::Exception, "unknown key" << key);
	  return false;
	}

	return true;
}

}