#include <boost/foreach.hpp>
#include "Bitmaps.h"
#include "Util2.h"

using namespace std;

namespace Moses2
{

Bitmaps::Bitmaps(MemPool &pool)
:m_pool(pool)
{
}

Bitmaps::~Bitmaps()
{
}

void Bitmaps::Init(size_t inputSize, const std::vector<bool> &initSourceCompleted)
{
  m_initBitmap = new (m_pool.Allocate<Bitmap>()) Bitmap(m_pool, inputSize);
  m_initBitmap->Init(initSourceCompleted);
  m_coll[m_initBitmap];
}

const Bitmap &Bitmaps::GetNextBitmap(const Bitmap &bm, const Range &range)
{
  Bitmap *newBM;
  if (m_recycler.empty()) {
    newBM = new (m_pool.Allocate<Bitmap>()) Bitmap(m_pool, bm.GetSize());
  }
  else {
	newBM = m_recycler.top();
	m_recycler.pop();
  }

  newBM->Init(bm, range);

  Coll::const_iterator iter = m_coll.find(newBM);
  if (iter == m_coll.end()) {
    m_coll[newBM] = NextBitmaps();
    return *newBM;
  } else {
	m_recycler.push(newBM);

    return *iter->first;
  }
}

const Bitmap &Bitmaps::GetBitmap(const Bitmap &bm, const Range &range)
{
  Coll::iterator iter = m_coll.find(&bm);
  assert(iter != m_coll.end());

  const Bitmap *newBM;
  NextBitmaps &next = iter->second;
  NextBitmaps::const_iterator iterNext = next.find(&range);
  if (iterNext == next.end()) {
    // not seen the link yet.
    newBM = &GetNextBitmap(bm, range);
    next[&range] = newBM;
  } else {
    // link exist
    //std::cerr << "link exists" << endl;
    newBM = iterNext->second;
  }
  return *newBM;
}

}