/*\file Chaco.c
 *\brief:  Chaco partitioner mex module
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#error "Cannot compile with HAVE_CONFIG_H symbol! run configure first!"
#endif


#include "./Chaco.h"

void mexFunction( int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[]){
   
	int i;
	int nterms;

	/*Inputs: */
	int     nvtxs;               /* number of vertices in graph           */
	int    *start;               /* start of edge list for each vertex    */
	int    *adjacency;           /* edge list data                        */
	int    *vwgts       = NULL;  /* weights for all vertices              */
	int     nedges;
	float  *ewgts       = NULL;  /* weights for all edges                 */
	float  *x           = NULL;
	float  *y           = NULL;
	float  *z           = NULL;  /* coordinates for inertial method       */
	double  options[10] = {1,1,0,0,1,1,50,0,.001,7654321}; /* architecture and partitioning options */
	double *in_options  = NULL;
	int    *nparts      = NULL;   /* number of parts options               */
	int     npart;
	double *goal        = NULL;   /* desired set sizes                     */

	/*intermediary pointers: */
	mwIndex *mwstart, *mwadjacency;
	double  *doublepointer;

	/*output: */
   short  *assignment       = NULL; /* set number of each vtx (length nvtxs+1)                */
   double *doubleassignment = NULL; /*holds assignment, in double format, to return to matlab */

	#ifndef _HAVE_CHACO_ //only works if dakota library has been compiled in.
	_error_(" Chaco not available! Cannot carry out Chaco partitioning!");
	#endif

	/*Boot module: */
	MODULEBOOT();

	/*checks on arguments on the matlab side: */
	CheckNumMatlabArguments(nlhs,NLHS,nrhs,NRHS,__FUNCT__,&ChacoUsage);

	/*Fetch adjacency matrix: */
	nvtxs = mxGetN(A_IN);
	mwstart = mxGetJc(A_IN);
	start=(int*)xmalloc((nvtxs+1)*sizeof(int));
	for (i=0; i<nvtxs+1;i++)start[i]=(int)mwstart[i];

	mwadjacency = mxGetIr(A_IN);
	adjacency = (int*)xmalloc(mxGetNzmax(A_IN)*sizeof(int));
	for (i=0; i<mxGetNzmax(A_IN); i++) adjacency[i]= (int)mwadjacency[i];

	nedges = start[nvtxs];
	if(!mxIsEmpty(EWGTS_IN)){
		ewgts = (float*)xcalloc(nedges, sizeof(float));
		doublepointer=mxGetPr(A_IN);
		for (i = 0; i < nedges; i++)ewgts[i] = (float)doublepointer[i];
	}
	else ewgts=NULL;

	/*Fetch rest of data: */
	FetchData(&vwgts,&nterms,VWGTS_IN); 
	FetchData(&x,&nterms,X_IN); 
	FetchData(&y,&nterms,Y_IN); 
	FetchData(&z,&nterms,Z_IN); 
	FetchData(&in_options,&nterms,OPTNS_IN); 
	for (i=0;i<(nterms<10?nterms:10);i++) options[i]=in_options[i]; //copy in_options into default options
	FetchData(&npart,NPARTS_IN); 
	nparts=(int*)xmalloc(sizeof(int)); nparts[0]=npart; //weird Chacox interface ain't it?
	FetchData(&goal,&nterms,GOAL_IN); 
	
	/*Some debugging print: {{{*/
	#ifdef _DEBUG_
	printf("nvtxs: %i\n",nvtxs);
	printf("options: [");
	for(i=0;i<10;i++)printf("%g|",options[i]);
	printf("]\n");
	printf("start: \n");
	for (i=0; i<nvtxs+1;i++)printf("%i ",start[i]);
	printf("\n");
	printf("adjacency: \n");
	for (i=0; i<mxGetNzmax(A_IN);i++)printf("%i ",adjacency[i]);
	printf("\n");
	printf("nedges: %i %p\n",nedges,ewgts);
	if(ewgts) for (i = 0; i < nedges; i++)printf("%g ",ewgts[i]);
	printf("\n");
	printf("vwgts:\n");
	for (i = 0; i < nvtxs; i++)printf("%g ",vwgts[i]);
	printf("\n");
	printf("nparts: %i\n",nparts[0]);
	printf("goal: %p\n",goal);
	#endif
	/*}}}*/
	
	/*Allocate output: */
	assignment = (short*)xcalloc(nvtxs, sizeof(short));
	
    /*Call core: */
	Chacox(nvtxs, start, adjacency, vwgts, ewgts, x, y, z, assignment, options, nparts, goal);

    /*Output data: */
	doubleassignment=(double*)xmalloc(nvtxs*sizeof(double));
	for(i=0;i<nvtxs;i++) doubleassignment[i]=(double)assignment[i];
	WriteData(ASSGN_OUT,doubleassignment,nvtxs);

	/*Free ressources:*/
	xfree((void**)&assignment); 
	xfree((void**)&goal);
	xfree((void**)&nparts);
	xfree((void**)&z);
	xfree((void**)&y);
	xfree((void**)&x);
	xfree((void**)&ewgts);
	xfree((void**)&vwgts);
	xfree((void**)&adjacency);
	xfree((void**)&start);
	xfree((void**)&doubleassignment);

	/*end module: */
	MODULEEND();
}

void ChacoUsage(void){
	_printf_(true,"\n");
	_printf_(true,"Usage: [assgn] = Chaco(A,vwgts,ewgts,x,y,z,options,nparts,goal);\n");
	_printf_(true,"\n");
}
