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// .NAME ChainingMesh - Assign all particles on this processor to a 3D bucket
//
// .SECTION Description
// ChainingMesh takes particle locations and assigns particles to a mesh
// location in a 3D grid so that when an area of interest must be searched,
// only the particles in buckets for that area will be examined.  The 
// chaining mesh is designed such that the 3D mesh holds the first particle
// index in the bucket, and that array position points to the next particle
// in the bucket.
//

#ifndef ChainingMesh_h
#define ChainingMesh_h

#include "CosmoDefinition.h"
#include <string>
#include <vector>

using namespace std;

class COSMO_EXPORT ChainingMesh {
public:
  // Chaining mesh for all particles on a processor
  ChainingMesh(
        POSVEL_T rL,            // Box size of entire physical problem
        POSVEL_T deadSize,      // Dead size of overflow particles
        POSVEL_T chainSize,     // Mesh size imposed on this physical space
        vector<POSVEL_T>* xLoc, // Locations of every particle on processor
        vector<POSVEL_T>* yLoc,
        vector<POSVEL_T>* zLoc);

  // Chaining mesh for a single halo
  ChainingMesh(
        POSVEL_T* minLoc,       // Bounding box of halo
        POSVEL_T* maxLoc,       // Bounding box of halo
        POSVEL_T chainSize,     // Mesh size imposed on this physical space
        int haloCount,          // Number of particles in halo
        POSVEL_T* xLoc,         // Locations of every particle
        POSVEL_T* yLoc,
        POSVEL_T* zLoc);

  ~ChainingMesh();

  // Construct the chaining mesh
  void createChainingMesh();

  // Demonstration method to show how to iterate over the chaining mesh
  void printChainingMeshCentroids();

  POSVEL_T getChainSize()       { return this->chainSize; }

  POSVEL_T getMinMine(int dim)  { return this->minRange[dim]; }
  POSVEL_T getMaxMine(int dim)  { return this->maxRange[dim]; }
  int getMeshSize(int dim)      { return this->meshSize[dim]; }

  POSVEL_T* getMinRange()       { return this->minRange; }
  POSVEL_T* getMaxRange()       { return this->maxRange; }
  int* getMeshSize()            { return this->meshSize; }

  int*** getBucketCount()       { return this->bucketCount; }
  int*** getBuckets()           { return this->buckets; }
  int* getBucketList()          { return this->bucketList; }

private:
  int    myProc;                // My processor number
  int    numProc;               // Total number of processors

  int    layoutSize[DIMENSION]; // Decomposition of processors
  int    layoutPos[DIMENSION];  // Position of this processor in decomposition

  POSVEL_T boxSize;             // Physical box size of the data set
  POSVEL_T deadSize;            // Physical size of dead particle region

  long   particleCount;         // Total particles on this processor
  POSVEL_T* xx;                 // X location for particles on this processor
  POSVEL_T* yy;                 // Y location for particles on this processor
  POSVEL_T* zz;                 // Z location for particles on this processor
                                // processor index where it is ALIVE

  POSVEL_T chainSize;           // Grid size in chaining mesh
  POSVEL_T* minRange;           // Physical range on processor, including dead
  POSVEL_T* maxRange;           // Physical range on processor, including dead
  int* meshSize;                // Chaining mesh grid dimension

  int*** buckets;               // First particle index into bucketList
  int*** bucketCount;           // Size of each bucket 
  int* bucketList;              // Indices of next particle in halo
};

#endif
