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/*------------------------------------------------------------------------
 * Copyright (C) 2011 For the list of authors, see file AUTHORS.
 *
 * This file is part of SOFI2D.
 * 
 * SOFI2D is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
 * 
 * SOFI2D is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with SOFI2D. See file COPYING and/or 
  * <http://www.gnu.org/licenses/gpl-2.0.html>.
--------------------------------------------------------------------------*/
/*------------------------------------------------------------------------
 *   write values of dynamic field variables at the edges of the
 *   local grid into buffer arrays and  exchanged between
 *   processes.
 *
 *  ----------------------------------------------------------------------*/

#include "fd.h"

void exchange_v(float ** vx, float ** vy,
		float ** bufferlef_to_rig, float ** bufferrig_to_lef,
		float ** buffertop_to_bot, float ** bufferbot_to_top,
		MPI_Request * req_send, MPI_Request * req_rec){


	extern int NX, NY, POS[3], NPROCX, NPROCY, BOUNDARY, FDORDER;
	extern int INDEX[5];
	extern const int TAG1,TAG2,TAG5,TAG6;
	MPI_Status  status;
	int i, j, fdo, fdo2, n, l;



	fdo = FDORDER/2 + 1;
	// 	fdo2= FDORDER + 1;
	fdo2 = 2*fdo;

	/* top - bottom */

	if (POS[2]!=0)	/* no boundary exchange at top of global grid */
		for (i=1;i<=NX;i++){
			n = 1;
			/* storage of top of local volume into buffer */
			for (l=1;l<=fdo-1;l++) {
				buffertop_to_bot[i][n++]  =  vy[l][i];
			}
			for (l=1;l<=fdo;l++) {
				buffertop_to_bot[i][n++]  =  vx[l][i];
			}
		}


	if (POS[2]!=NPROCY-1)	/* no boundary exchange at bottom of global grid */
		for (i=1;i<=NX;i++){
			/* storage of bottom of local volume into buffer */
			n = 1;
			for (l=1;l<=fdo;l++) {
				bufferbot_to_top[i][n++]  =  vy[NY-l+1][i];
			}
			for (l=1;l<=fdo-1;l++) {
				bufferbot_to_top[i][n++]  =  vx[NY-l+1][i];
			}
		}


	/* send and reveive values for points at inner boundaries */

	/*
	MPI_Bsend(&buffertop_to_bot[1][1],NX*fdo2,MPI_FLOAT,INDEX[3],TAG5,MPI_COMM_WORLD);
	MPI_Barrier(MPI_COMM_WORLD);
	MPI_Recv(&buffertop_to_bot[1][1],NX*fdo2,MPI_FLOAT,INDEX[4],TAG5,MPI_COMM_WORLD,&status);
	MPI_Bsend(&bufferbot_to_top[1][1],NX*fdo2,MPI_FLOAT,INDEX[4],TAG6,MPI_COMM_WORLD);
	MPI_Barrier(MPI_COMM_WORLD);
	MPI_Recv(&bufferbot_to_top[1][1],NX*fdo2,MPI_FLOAT,INDEX[3],TAG6,MPI_COMM_WORLD,&status);   
	 */

	/* alternative communication */
	/* still blocking communication */
	MPI_Sendrecv_replace(&buffertop_to_bot[1][1],NX*fdo2,MPI_FLOAT,INDEX[3],TAG5,INDEX[4],TAG5,MPI_COMM_WORLD,&status);
	MPI_Sendrecv_replace(&bufferbot_to_top[1][1],NX*fdo2,MPI_FLOAT,INDEX[4],TAG6,INDEX[3],TAG6,MPI_COMM_WORLD,&status);

	/* Initiates a communication with a persistent request handle */
	/* send and reveive values at edges of the local grid */
	/*for (i=2;i<=3;i++){
		MPI_Start(&req_send[i]);
		MPI_Wait(&req_send[i],&status);
		MPI_Start(&req_rec[i]);
		MPI_Wait(&req_rec[i],&status);
	}*/


	if (POS[2]!=NPROCY-1)	/* no boundary exchange at bottom of global grid */
		for (i=1;i<=NX;i++){
			n = 1;
			for (l=1;l<=fdo-1;l++) {
				vy[NY+l][i] = buffertop_to_bot[i][n++];
			}
			for (l=1;l<=fdo;l++) {
				vx[NY+l][i] = buffertop_to_bot[i][n++];
			}
		}

	if (POS[2]!=0)	/* no boundary exchange at top of global grid */
		for (i=1;i<=NX;i++){
			n = 1;
			for (l=1;l<=fdo;l++) {
				vy[1-l][i] = bufferbot_to_top[i][n++];
			}
			for (l=1;l<=fdo-1;l++) {
				vx[1-l][i] = bufferbot_to_top[i][n++];
			}
		}


	/* left - right */

	/* exchange if periodic boundary condition is applied */
	if ((BOUNDARY) || (POS[1]!=0))	
		for (j=1;j<=NY;j++){
			/* storage of left edge of local volume into buffer */
			n = 1;
			for (l=1;l<fdo;l++) {
				bufferlef_to_rig[j][n++] =  vy[j][l];
			}
			for (l=1;l<fdo-1;l++) {
				bufferlef_to_rig[j][n++] =  vx[j][l];
			}
		}


	/* no exchange if periodic boundary condition is applied */
	if ((BOUNDARY) || (POS[1]!=NPROCX-1))	/* no boundary exchange at right edge of global grid */
		for (j=1;j<=NY;j++){
			/* storage of right edge of local volume into buffer */
			n = 1;
			for (l=1;l<fdo-1;l++) {
				bufferrig_to_lef[j][n++] =  vy[j][NX-l+1];
			}
			for (l=1;l<fdo;l++) {
				bufferrig_to_lef[j][n++] =  vx[j][NX-l+1];
			}
		}

	/* send and reveive values for points at inner boundaries */

	/*
 	MPI_Bsend(&bufferlef_to_rig[1][1],(NY)*fdo2,MPI_FLOAT,INDEX[1],TAG1,MPI_COMM_WORLD);
	MPI_Barrier(MPI_COMM_WORLD);
	MPI_Recv(&bufferlef_to_rig[1][1],(NY)*fdo2,MPI_FLOAT,INDEX[2],TAG1,MPI_COMM_WORLD,&status);
	MPI_Bsend(&bufferrig_to_lef[1][1],(NY)*fdo2,MPI_FLOAT,INDEX[2],TAG2,MPI_COMM_WORLD);
	MPI_Barrier(MPI_COMM_WORLD);
	MPI_Recv(&bufferrig_to_lef[1][1],(NY)*fdo2,MPI_FLOAT,INDEX[1],TAG2,MPI_COMM_WORLD,&status);
	 */

	/* alternative communication */
	/* still blocking communication */
	MPI_Sendrecv_replace(&bufferlef_to_rig[1][1],NY*fdo2,MPI_FLOAT,INDEX[1],TAG1,INDEX[2],TAG1,MPI_COMM_WORLD,&status);
	MPI_Sendrecv_replace(&bufferrig_to_lef[1][1],NY*fdo2,MPI_FLOAT,INDEX[2],TAG2,INDEX[1],TAG2,MPI_COMM_WORLD,&status);

	/* send and reveive values at edges of the local grid */
	/*for (i=0;i<=1;i++){
		MPI_Start(&req_send[i]);
		MPI_Wait(&req_send[i],&status);
		MPI_Start(&req_rec[i]);
		MPI_Wait(&req_rec[i],&status);
	}*/


	/* no exchange if periodic boundary condition is applied */
	if ((BOUNDARY) || (POS[1]!=NPROCX-1))	/* no boundary exchange at right edge of global grid */
		for (j=1;j<=NY;j++){
			n = 1;
			for (l=1;l<fdo;l++) {
				vy[j][NX+l] = bufferlef_to_rig[j][n++];
			}
			for (l=1;l<fdo-1;l++) {
				vx[j][NX+l] = bufferlef_to_rig[j][n++];
			}
		}

	/* no exchange if periodic boundary condition is applied */
	if ((BOUNDARY) || (POS[1]!=0))	/* no boundary exchange at left edge of global grid */
		for (j=1;j<=NY;j++){
			n = 1;
			for (l=1;l<fdo-1;l++) {
				vy[j][1-l] = bufferrig_to_lef[j][n++];
			}
			for (l=1;l<fdo;l++) {
				vx[j][1-l] = bufferrig_to_lef[j][n++];
			}
		}

}