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// .NAME InitialExchange - Get pointer to alive plus dead particles for this
//                         processor.  Store the alive in supplied vectors
//                         and send the dead to the correct neighbor processor
//                         where they become alive.
//
// .SECTION Description
// InitialExchange takes input from the particle initializer which originally
// contained alive particles on this processor, but after the particles move
// a little they might have moved to a neighbor processor.  Input is in the
// form of arrays, but vectors are supplied which will be filled with the
// alive particles for this processor.  As each particle is examined it is
// placed immediately in the vector if it is alive on this processor and the
// index is placed by neighbor if it is dead on this processor.  After
// categorizing all particles, the dead are exchanged with neighbors where
// they become alive.
//
// After this initial exchange, ParticleExchange is called to place all
// dead particles (which will be the ones sent in this step being returned
// plus the others which were originally placed correctly on the neighbor).

#ifndef InitialExchange_h
#define InitialExchange_h

#include "Definition.h"
#include "Message.h"
#include <string>
#include <vector>

#define INITIAL_EXCHANGE_FUDGE 8.0

using namespace std;

class InitialExchange {
public:
  InitialExchange();
  ~InitialExchange();

  // Set parameters particle distribution
  void setParameters(
	POSVEL_T rL,		// Box size of the physical problem
	POSVEL_T deadSize);	// Dead delta border for each processor

  // Set neighbor processor numbers and calculate dead regions
  void initialize();

  // Calculate physical range of alive particles which must be shared
  void calculateExchangeRegions();

  // Set alive particle arrays from the initializer
  void setParticleArrays(
	long count,
	POSVEL_T* xx,
	POSVEL_T* yy,
	POSVEL_T* zz,
	POSVEL_T* vx,
	POSVEL_T* vy,
	POSVEL_T* vz,
	POTENTIAL_T* potential,
	ID_T* tag,
	MASK_T* mask);

  // Set alive particle vectors which will be filled in
  void setParticleVectors(
	vector<POSVEL_T>* xx,
	vector<POSVEL_T>* yy,
	vector<POSVEL_T>* zz,
	vector<POSVEL_T>* vx,
	vector<POSVEL_T>* vy,
	vector<POSVEL_T>* vz,
	vector<POTENTIAL_T>* potential,
	vector<ID_T>* tag,
	vector<MASK_T>* mask,
	vector<STATUS_T>* status);

  // Identify and exchange alive particles which must be shared with neighbors
  void exchangeParticles();
  void identifyExchangeParticles();
  void exchangeNeighborParticles();
  void exchange(
	int sendTo,		// Neighbor to send particles to
	int recvFrom,		// Neighbor to receive particles from
	Message* sendMessage,
	Message* recvMessage);

  long getNumberOfAliveParticles() const { return numberOfAliveParticles; }

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 (rL)
  POSVEL_T deadSize;		// Border size for dead particles

  long   numberOfAliveParticles;
  long   particleCount;		// Number of particles received from arrays

  POSVEL_T minAlive[DIMENSION];	// Minimum alive particle not exchanged
  POSVEL_T maxAlive[DIMENSION];	// Maximum alive particle not exchanged
  POSVEL_T minDead[DIMENSION];	// Minimum particle sent
  POSVEL_T maxDead[DIMENSION];	// Maximum particle sent

  int    neighbor[NUM_OF_NEIGHBORS];		 // Neighbor processor indices
  POSVEL_T minRange[NUM_OF_NEIGHBORS][DIMENSION]; // Range of dead particles
  POSVEL_T maxRange[NUM_OF_NEIGHBORS][DIMENSION]; // Range of dead particles

  vector<ID_T> neighborParticles[NUM_OF_NEIGHBORS];
				// Particle ids sent to each neighbor as ALIVE

  POSVEL_T* xxInit;		// X location from initializer
  POSVEL_T* yyInit;		// Y location from initializer
  POSVEL_T* zzInit;		// Z location from initializer
  POSVEL_T* vxInit;		// X velocity from initializer
  POSVEL_T* vyInit;		// Y velocity from initializer
  POSVEL_T* vzInit;		// Z velocity from initializer
  POTENTIAL_T* potInit;		// Particle potential
  ID_T* tagInit;		// Tag from initializer
  MASK_T* maskInit;		// Particle information

  vector<POSVEL_T>* xx;		// X location for particles on this processor
  vector<POSVEL_T>* yy;		// Y location for particles on this processor
  vector<POSVEL_T>* zz;		// Z location for particles on this processor
  vector<POSVEL_T>* vx;		// X velocity for particles on this processor
  vector<POSVEL_T>* vy;		// Y velocity for particles on this processor
  vector<POSVEL_T>* vz;		// Z velocity for particles on this processor
  vector<POTENTIAL_T>* pot;	// Particle potential
  vector<ID_T>* tag;		// Id tag for particles on this processor
  vector<MASK_T>* mask;		// Particle information

  vector<STATUS_T>* status;	// Particle is ALIVE when it leaves
};

#endif