/*
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 *  Point Cloud Library (PCL) - www.pointclouds.org
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 * $Id: octree_nodes.h 5596 2012-04-17 15:09:31Z jkammerl $
 */

#pragma once

#include <pcl/types.h>

#include <cassert>
#include <cstddef>
#include <vector>

namespace pcl {
namespace octree {

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/** \brief @b Octree container class that can serve as a base to construct own leaf node
 * container classes.
 * \author Julius Kammerl (julius@kammerl.de)
 */
class OctreeContainerBase {
public:
  virtual ~OctreeContainerBase() = default;

  /** \brief Equal comparison operator
   */
  virtual bool
  operator==(const OctreeContainerBase&) const
  {
    return false;
  }

  /** \brief Inequal comparison operator
   * \param[in] other OctreeContainerBase to compare with
   */
  bool
  operator!=(const OctreeContainerBase& other) const
  {
    return (!operator==(other));
  }

  /** \brief Pure abstract method to get size of container (number of indices)
   * \return number of points/indices stored in leaf node container.
   */
  virtual uindex_t
  getSize() const
  {
    return 0u;
  }

  /** \brief Pure abstract reset leaf node implementation. */
  virtual void
  reset() = 0;

  /** \brief Empty addPointIndex implementation. This leaf node does not store any point
   * indices.
   */
  void
  addPointIndex(const index_t&)
  {}

  /** \brief Empty getPointIndex implementation as this leaf node does not store any
   * point indices.
   */
  void
  getPointIndex(index_t&) const
  {}

  /** \brief Empty getPointIndices implementation as this leaf node does not store any
   * data. \
   */
  void
  getPointIndices(Indices&) const
  {}
};

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/** \brief @b Octree container class that does not store any information.
 * \note Can be used for occupancy trees that are used for checking only the existence
 * of leaf nodes in the tree
 * \author Julius Kammerl (julius@kammerl.de)
 */

class OctreeContainerEmpty : public OctreeContainerBase {
public:
  /** \brief Octree deep copy method */
  virtual OctreeContainerEmpty*
  deepCopy() const
  {
    return (new OctreeContainerEmpty(*this));
  }

  /** \brief Abstract get size of container (number of DataT objects)
   * \return number of DataT elements in leaf node container.
   */
  uindex_t
  getSize() const override
  {
    return 0;
  }

  /** \brief Abstract reset leaf node implementation. */
  void
  reset() override
  {}

  /** \brief Empty addPointIndex implementation. This leaf node does not store any point
   * indices.
   */
  void addPointIndex(index_t) {}

  /** \brief Empty getPointIndex implementation as this leaf node does not store any
   * point indices.
   */
  index_t
  getPointIndex() const
  {
    assert("getPointIndex: undefined point index");
    return -1;
  }

  /** \brief Empty getPointIndices implementation as this leaf node does not store any
   * data.
   */
  void
  getPointIndices(Indices&) const
  {}
};

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/** \brief @b Octree container class that does store a single point index.
 * \note Enables the octree to store a single DataT element within its leaf nodes.
 * \author Julius Kammerl (julius@kammerl.de)
 */
class OctreeContainerPointIndex : public OctreeContainerBase {
public:
  /** \brief Empty constructor. */
  OctreeContainerPointIndex() { reset(); }

  /** \brief Octree deep copy method */
  virtual OctreeContainerPointIndex*
  deepCopy() const
  {
    return (new OctreeContainerPointIndex(*this));
  }

  /** \brief Equal comparison operator
   * \param[in] other OctreeContainerBase to compare with
   */
  bool
  operator==(const OctreeContainerBase& other) const override
  {
    const OctreeContainerPointIndex* otherConDataT =
        dynamic_cast<const OctreeContainerPointIndex*>(&other);

    return (this->data_ == otherConDataT->data_);
  }

  /** \brief Add point index to container memory. This container stores a only a single
   * point index.
   * \param[in] data_arg index to be stored within leaf node.
   */
  void
  addPointIndex(index_t data_arg)
  {
    data_ = data_arg;
  }

  /** \brief Retrieve point index from container. This container stores a only a single
   * point index
   * \return index stored within container.
   */
  index_t
  getPointIndex() const
  {
    return data_;
  }

  /** \brief Retrieve point indices from container. This container stores only a single
   * point index
   * \param[out] data_vector_arg vector of point indices to be stored within
   * data vector
   */
  void
  getPointIndices(Indices& data_vector_arg) const
  {
    if (data_ != static_cast<index_t>(-1))
      data_vector_arg.push_back(data_);
  }

  /** \brief Get size of container (number of DataT objects)
   * \return number of DataT elements in leaf node container.
   */
  uindex_t
  getSize() const override
  {
    return data_ != static_cast<index_t>(-1) ? 0 : 1;
  }

  /** \brief Reset leaf node memory to zero. */
  void
  reset() override
  {
    data_ = static_cast<index_t>(-1);
  }

protected:
  /** \brief Point index stored in octree. */
  index_t data_;
};

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/** \brief @b Octree container class that does store a vector of point indices.
 * \note Enables the octree to store multiple DataT elements within its leaf nodes.
 * \author Julius Kammerl (julius@kammerl.de)
 */
class OctreeContainerPointIndices : public OctreeContainerBase {
public:
  /** \brief Octree deep copy method */
  virtual OctreeContainerPointIndices*
  deepCopy() const
  {
    return (new OctreeContainerPointIndices(*this));
  }

  /** \brief Equal comparison operator
   * \param[in] other OctreeContainerDataTVector to compare with
   */
  bool
  operator==(const OctreeContainerBase& other) const override
  {
    const OctreeContainerPointIndices* otherConDataTVec =
        dynamic_cast<const OctreeContainerPointIndices*>(&other);

    return (this->leafDataTVector_ == otherConDataTVec->leafDataTVector_);
  }

  /** \brief Add point index to container memory. This container stores a vector of
   * point indices.
   * \param[in] data_arg index to be stored within leaf node.
   */
  void
  addPointIndex(index_t data_arg)
  {
    leafDataTVector_.push_back(data_arg);
  }

  /** \brief Retrieve point index from container. This container stores a vector of
   * point indices.
   * \return index stored within container.
   */
  index_t
  getPointIndex() const
  {
    return leafDataTVector_.back();
  }

  /** \brief Retrieve point indices from container. This container stores a vector of
   * point indices.
   * \param[out] data_vector_arg vector of point indices to be stored
   * within data vector
   */
  void
  getPointIndices(Indices& data_vector_arg) const
  {
    data_vector_arg.insert(
        data_vector_arg.end(), leafDataTVector_.begin(), leafDataTVector_.end());
  }

  /** \brief Retrieve reference to point indices vector. This container stores a vector
   * of point indices.
   * \return reference to vector of point indices to be stored within data vector
   */
  Indices&
  getPointIndicesVector()
  {
    return leafDataTVector_;
  }

  /** \brief Get size of container (number of indices)
   * \return number of point indices in container.
   */
  uindex_t
  getSize() const override
  {
    return static_cast<uindex_t>(leafDataTVector_.size());
  }

  /** \brief Reset leaf node. Clear DataT vector.*/
  void
  reset() override
  {
    leafDataTVector_.clear();
  }

protected:
  /** \brief Leaf node DataT vector. */
  Indices leafDataTVector_;
};

} // namespace octree
} // namespace pcl
