/*
 * Software License Agreement (BSD License)
 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2010-2012, Willow Garage, Inc.
 *  Copyright (c) 2012, Urban Robotics, Inc.
 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     with the distribution.
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 *     from this software without specific prior written permission.
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 */

#pragma once

// C++
#include <mutex>
#include <random>

#include <pcl/outofcore/octree_abstract_node_container.h>

namespace pcl
{
  namespace outofcore
  {
    /** \class OutofcoreOctreeRamContainer
     *  \brief Storage container class which the outofcore octree base is templated against
     *  \note Code was adapted from the Urban Robotics out of core octree implementation. 
     *  Contact Jacob Schloss <jacob.schloss@urbanrobotics.net> with any questions. 
     *  http://www.urbanrobotics.net/
     * 
     *  \ingroup outofcore
     *  \author Jacob Schloss (jacob.scloss@urbanrobotics.net)
     */
    template<typename PointT>
    class OutofcoreOctreeRamContainer : public OutofcoreAbstractNodeContainer<PointT>
    {
      public:
        using AlignedPointTVector = typename OutofcoreAbstractNodeContainer<PointT>::AlignedPointTVector;

        /** \brief empty constructor (with a path parameter?)
          */
        OutofcoreOctreeRamContainer (const boost::filesystem::path&) : container_ () { }
        
        /** \brief inserts count number of points into container; uses the container_ type's insert function
          * \param[in] start - address of first point in array
          * \param[in] count - the maximum offset from start of points inserted 
          */
        void
        insertRange (const PointT* start, const std::uint64_t count);

        /** \brief inserts count points into container 
          * \param[in] start - address of first point in array
          * \param[in] count - the maximum offset from start of points inserted 
          */
        void
        insertRange (const PointT* const * start, const std::uint64_t count);

        void
        insertRange (AlignedPointTVector& /*p*/)
        {
          PCL_ERROR ("[pcl::outofcore::OutofcoreOctreeRamContainer] Inserting eigen-aligned point vectors is not implemented using the ram containers\n");
          //insertRange (&(p.begin ()), p.size ());
        }

        void
        insertRange (const AlignedPointTVector& /*p*/)
        {
          PCL_ERROR ("[pcl::outofcore::OutofcoreOctreeRamContainer] Inserting eigen-aligned point vectors is not implemented using the ram containers\n");
        }
        
        /** \brief 
          * \param[in] start Index of first point to return from container
          * \param[in] count Offset (start + count) of the last point to return from container
          * \param[out] v Array of points read from the input range
          */
        void
        readRange (const std::uint64_t start, const std::uint64_t count, AlignedPointTVector &v);

        /** \brief grab percent*count random points. points are NOT
          *   guaranteed to be unique (could have multiple identical points!)
          *
          * \param[in] start Index of first point in range to subsample
          * \param[in] count Offset (start+count) of last point in range to subsample
          * \param[in] percent Percentage of range to return
          * \param[out] v Vector with percent*count uniformly random sampled 
          * points from given input rangerange
          */
        void
        readRangeSubSample (const std::uint64_t start, const std::uint64_t count, const double percent, AlignedPointTVector &v);

        /** \brief returns the size of the vector of points stored in this class */
        inline std::uint64_t
        size () const
        {
          return container_.size ();
        }

        inline bool
        empty () const
        {
          return container_.empty ();
        }
        

        /** \brief clears the vector of points in this class */
        inline void
        clear ()
        {
          //clear the elements in the vector of points
          container_.clear ();
        }

        /** \brief Writes ascii x,y,z point data to path.string().c_str()
          *  \param path The path/filename destination of the ascii xyz data
          */
        void
        convertToXYZ (const boost::filesystem::path &path);

        inline PointT
        operator[] (std::uint64_t index) const
        {
          assert ( index < container_.size () );
          return ( container_[index] );
        }
        

      protected:
        //no copy construction
        OutofcoreOctreeRamContainer (const OutofcoreOctreeRamContainer& /*rval*/) { }

        OutofcoreOctreeRamContainer&
        operator= (const OutofcoreOctreeRamContainer& /*rval*/) { }

        //the actual container
        //std::deque<PointT> container;

        /** \brief linear container to hold the points */
        AlignedPointTVector container_;

        static std::mutex rng_mutex_;
        static std::mt19937 rng_;
    };
  }
}
