/*
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 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2010-2012, Willow Garage, Inc.
 *
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 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * $Id: outofcore_depth_first_iterator.hpp 7938 2012-11-14 06:27:39Z jrosen $
 */

#ifndef PCL_OUTOFCORE_BREADTH_FIRST_ITERATOR_IMPL_H_
#define PCL_OUTOFCORE_BREADTH_FIRST_ITERATOR_IMPL_H_

namespace pcl
{
  namespace outofcore
  {

    template<typename PointT, typename ContainerT> 
    OutofcoreBreadthFirstIterator<PointT, ContainerT>::OutofcoreBreadthFirstIterator (OutofcoreOctreeBase<ContainerT, PointT>& octree_arg)
    : OutofcoreIteratorBase<PointT, ContainerT> (octree_arg)
    {
      reset();
    }

    ////////////////////////////////////////////////////////////////////////////////

    template<typename PointT, typename ContainerT> 
    OutofcoreBreadthFirstIterator<PointT, ContainerT>::~OutofcoreBreadthFirstIterator () = default;

    ////////////////////////////////////////////////////////////////////////////////

    template<typename PointT, typename ContainerT>
    OutofcoreBreadthFirstIterator<PointT, ContainerT>&
    OutofcoreBreadthFirstIterator<PointT, ContainerT>::operator++ ()
    {
      if (!FIFO_.empty ())
      {
        // Get the first entry from the FIFO queue
        OctreeDiskNode *node = FIFO_.front ();
        FIFO_.pop_front ();

        // If not skipping children, not at the max specified depth and we're a branch then iterate over children
        if (!skip_child_voxels_ && node->getDepth () < this->max_depth_ && node->getNodeType () == pcl::octree::BRANCH_NODE)
        {
          // Get the branch node
          auto* branch = static_cast<BranchNode*> (node);
          OctreeDiskNode* child = nullptr;

          // Iterate over the branches children
          for (unsigned char child_idx = 0; child_idx < 8 ; child_idx++)
          {
            // If child/index exists add it to FIFO queue
            child = this->octree_.getBranchChildPtr (*branch, child_idx);
            if (child)
            {
              FIFO_.push_back (child);
            }
          }
        }
      }

      // Reset skipped children
      skip_child_voxels_ = false;

      // If there's a queue, set the current node to the first entry
      if (!FIFO_.empty ())
      {
        this->currentNode_ = FIFO_.front ();
      }
      else
      {
        this->currentNode_ = nullptr;
      }

      return (*this);
    }

    ////////////////////////////////////////////////////////////////////////////////

  }//namespace pcl
}//namespace outofcore

#endif //PCL_OUTOFCORE_BREADTH_FIRST_ITERATOR_IMPL_H_

