/*-----------------------------------------------------------------------------------------
 * Copyright (C) 2016  For the list of authors, see file AUTHORS.
 *
 * This file is part of IFOS.
 * 
 * IFOS 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.
 * 
 * IFOS 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 IFOS. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
-----------------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------
 *   Read acoustic model properties (vp,density) from files  
 *
 *  last update 29.06.2003
 *  ----------------------------------------------------------------------*/


/* This file contains function readmod, which has the purpose
   to read data from model-files for viscoelastic simulation */

#include "fd.h"

void readmod_acoustic(float  **  rho, float **  pi){

	extern int NX, NY, NXG, NYG,  POS[3], MYID, PARAMETERIZATION;
	extern char  MFILE[STRING_SIZE];	
	extern FILE *FP;

		
	/* local variables */
	float rhov, piv, vp;
	int i, j, ii, jj;
	FILE *fp_vp, *fp_rho;
	char filename[STRING_SIZE];


	   fprintf(FP,"\n...reading model information from modell-files...\n");
           
	   /* read density and seismic velocities */
	   /* ----------------------------------- */
	   if(PARAMETERIZATION==1){
	   fprintf(FP,"\t Vp:\n\t %s.vp\n\n",MFILE);
	   sprintf(filename,"%s.vp",MFILE);
	   fp_vp=fopen(filename,"r");
	   if (fp_vp==NULL) err(" Could not open model file for Vp ! ");

	   fprintf(FP,"\t Density:\n\t %s.rho\n\n",MFILE);
	   sprintf(filename,"%s.rho",MFILE);
	   fp_rho=fopen(filename,"r");
	   if (fp_rho==NULL) err(" Could not open model file for densities ! ");
           }
	   

	/* loop over global grid */
		for (i=1;i<=NXG;i++){
			for (j=1;j<=NYG;j++){
			fread(&vp, sizeof(float), 1, fp_vp);
			fread(&rhov, sizeof(float), 1, fp_rho);
				
			/* only the PE which belongs to the current global gridpoint 
			is saving model parameters in his local arrays */
				if ((POS[1]==((i-1)/NX)) && 
				    (POS[2]==((j-1)/NY))){
					ii=i-POS[1]*NX;
					jj=j-POS[2]*NY;
                                
                                pi[jj][ii]=vp;
                                rho[jj][ii]=rhov;
				
				}
			}
		}
	

	fclose(fp_vp);
	fclose(fp_rho);
	
	
	/* each PE writes his model to disk */
	sprintf(filename,"%s.fdveps.pi",MFILE);
	writemod(filename,pi,3);
	MPI_Barrier(MPI_COMM_WORLD);

	if (MYID==0) mergemod(filename,3);
	
	sprintf(filename,"%s.fdveps.rho",MFILE);
	writemod(filename,rho,3);
	MPI_Barrier(MPI_COMM_WORLD);
	                        
	if (MYID==0) mergemod(filename,3);

}