/*
*   Matrix Market I/O library for ANSI C
*
*   See http://math.nist.gov/MatrixMarket for details.
*
*   (Version 1.01, 5/2003)
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "dr_const.h"
#include "dr_externs.h"
#include "dr_mmio.h"
#include "dr_compress_const.h"


int mm_read_unsymmetric_sparse(const char *fname, int *M_, int *N_, int *nz_,
		double **val_, int **I_, int **J_)
{
    ZOLTAN_FILE *f;
    MM_typecode matcode;
    int M, N, nz;
    int i;
    double *val;
    int *I, *J;

    f = ZOLTAN_FILE_open(fname, "r", STANDARD);
    if (f == NULL)
      return -1;

    if (mm_read_banner(f, &matcode) != 0)
    {
	printf("mm_read_unsymetric: Could not process Matrix Market banner ");
	printf(" in file [%s]\n", fname);
	return -1;
    }



    if ( !(mm_is_real(matcode) && mm_is_matrix(matcode) &&
	    mm_is_sparse(matcode)))
    {
	fprintf(stderr, "Sorry, this application does not support ");
	fprintf(stderr, "Market Market type: [%s]\n",
		mm_typecode_to_str(matcode));
	return -1;
    }

    /* find out size of sparse matrix: M, N, nz .... */

    if (mm_read_mtx_crd_size(f, &M, &N, &nz) !=0)
    {
	fprintf(stderr, "read_unsymmetric_sparse(): could not parse matrix size.\n");
	return -1;
    }

    *M_ = M;
    *N_ = N;
    *nz_ = nz;

    /* reseve memory for matrices */

    I = (int *) malloc(nz * sizeof(int));
    J = (int *) malloc(nz * sizeof(int));
    val = (double *) malloc(nz * sizeof(double));

    *val_ = val;
    *I_ = I;
    *J_ = J;

    /* NOTE: when reading in doubles, ANSI C requires the use of the "l"  */
    /*   specifier as in "%lg", "%lf", "%le", otherwise errors will occur */
    /*  (ANSI C X3.159-1989, Sec. 4.9.6.2, p. 136 lines 13-15)            */

    for (i=0; i<nz; i++)
    {
      ZOLTAN_FILE_scanf(f, "%d %d %lg\n", &I[i], &J[i], &val[i]);
      I[i]--;  /* adjust from 1-based to 0-based */
      J[i]--;
    }
    ZOLTAN_FILE_close(f);

    return 0;
}

int mm_is_valid(MM_typecode matcode)
{
    if (!mm_is_matrix(matcode)) return 0;
    if (mm_is_dense(matcode) && mm_is_pattern(matcode)) return 0;
    if (mm_is_real(matcode) && mm_is_hermitian(matcode)) return 0;
    if (mm_is_pattern(matcode) && (mm_is_hermitian(matcode) ||
		mm_is_skew(matcode))) return 0;
    return 1;
}

int mm_read_banner(ZOLTAN_FILE* f, MM_typecode *matcode)
{
    char line[MM_MAX_LINE_LENGTH];
    char banner[MM_MAX_TOKEN_LENGTH];
    char mtx[MM_MAX_TOKEN_LENGTH];
    char crd[MM_MAX_TOKEN_LENGTH];
    char data_type[MM_MAX_TOKEN_LENGTH];
    char storage_scheme[MM_MAX_TOKEN_LENGTH];
    char *p;


    mm_clear_typecode(matcode);

    if (ZOLTAN_FILE_gets(line, MM_MAX_LINE_LENGTH, f) == NULL)
	return MM_PREMATURE_EOF;

    if (sscanf(line, "%s %s %s %s %s", banner, mtx, crd, data_type,
	storage_scheme) != 5)
	return MM_PREMATURE_EOF;

	/* convert to lower case */
    for (p=mtx; *p!='\0'; *p= (char) tolower(*p),p++);
    for (p=crd; *p!='\0'; *p= (char) tolower(*p),p++);
    for (p=data_type; *p!='\0'; *p= (char) tolower(*p),p++);
    for (p=storage_scheme; *p!='\0'; *p= (char) tolower(*p),p++);

    /* check for banner */
    if (strncmp(banner, MatrixMarketBanner, strlen(MatrixMarketBanner)) != 0)
	return MM_NO_HEADER;

	/* first field should be "matrix" */
    if (strcmp(mtx, MM_MTX_STR) != 0)
	return  MM_UNSUPPORTED_TYPE;
    mm_set_matrix(matcode);


    /* second field describes whether this is a sparse matrix (in coordinate
	    storgae) or a dense array */


    if (strcmp(crd, MM_SPARSE_STR) == 0)
	mm_set_sparse(matcode);
    else
    if (strcmp(crd, MM_DENSE_STR) == 0)
	    mm_set_dense(matcode);
    else
	return MM_UNSUPPORTED_TYPE;


    /* third field */

    if (strcmp(data_type, MM_REAL_STR) == 0)
	mm_set_real(matcode);
    else
    if (strcmp(data_type, MM_COMPLEX_STR) == 0)
	mm_set_complex(matcode);
    else
    if (strcmp(data_type, MM_PATTERN_STR) == 0)
	mm_set_pattern(matcode);
    else
    if (strcmp(data_type, MM_INT_STR) == 0)
	mm_set_integer(matcode);
    else
	return MM_UNSUPPORTED_TYPE;


    /* fourth field */

    if (strcmp(storage_scheme, MM_GENERAL_STR) == 0)
	mm_set_general(matcode);
    else
    if (strcmp(storage_scheme, MM_SYMM_STR) == 0)
	mm_set_symmetric(matcode);
    else
    if (strcmp(storage_scheme, MM_HERM_STR) == 0)
	mm_set_hermitian(matcode);
    else
    if (strcmp(storage_scheme, MM_SKEW_STR) == 0)
	mm_set_skew(matcode);
    else
	return MM_UNSUPPORTED_TYPE;


    return 0;
}

int mm_write_mtx_crd_size(FILE *f, int M, int N, int nz)
{
    if (fprintf(f, "%d %d %d\n", M, N, nz) < 0)
	return MM_COULD_NOT_WRITE_FILE;
    else
	return 0;
}

int mm_read_mtx_crd_size(ZOLTAN_FILE* f, int *M, int *N, int *nz )
{
    char line[MM_MAX_LINE_LENGTH], *c;
    int num_items_read;

    /* set return null parameter values, in case we exit with errors */
    *M = *N = *nz = 0;

    /* now continue scanning until you reach the end-of-comments */
    do
    {
	if (ZOLTAN_FILE_gets(line,MM_MAX_LINE_LENGTH,f) == NULL)
	    return MM_PREMATURE_EOF;

	c = line;
	while (*c && (*c != '\n') && isspace(*c)) c++;
    }while (*c == '%');

    /* line[] is either blank or has M,N, nz */
    if (sscanf(line, "%d %d %d", M, N, nz) == 3)
	return 0;

    else
    do
    {
	num_items_read = ZOLTAN_FILE_scanf(f, "%d %d %d", M, N, nz);
	if (num_items_read == EOF) return MM_PREMATURE_EOF;
    }
    while (num_items_read != 3);

    return 0;
}


int mm_read_mtx_array_size(ZOLTAN_FILE* f, int *M, int *N)
{
    char line[MM_MAX_LINE_LENGTH];
    int num_items_read;
    /* set return null parameter values, in case we exit with errors */
    *M = *N = 0;

    /* now continue scanning until you reach the end-of-comments */
    do
    {
	if (ZOLTAN_FILE_gets(line,MM_MAX_LINE_LENGTH,f) == NULL)
	    return MM_PREMATURE_EOF;
    }while (line[0] == '%');

    /* line[] is either blank or has M,N, nz */
    if (sscanf(line, "%d %d", M, N) == 2)
	return 0;

    else /* we have a blank line */
    do
    {
	num_items_read = ZOLTAN_FILE_scanf (f, "%d %d", M, N);
	if (num_items_read == EOF) return MM_PREMATURE_EOF;
    }
    while (num_items_read != 2);

    return 0;
}

int mm_write_mtx_array_size(FILE *f, int M, int N)
{
    if (fprintf(f, "%d %d\n", M, N) < 0)
	return MM_COULD_NOT_WRITE_FILE;
    else
	return 0;
}



/*-------------------------------------------------------------------------*/

/******************************************************************/
/* use when I[], J[], and val[]J, and val[] are already allocated */
/******************************************************************/

int mm_read_mtx_crd_data(ZOLTAN_FILE* f, int M, int N, int nz, int I[], int J[],
	double val[], MM_typecode matcode)
{
    int i;
    int dummy = 0;

    if (mm_is_complex(matcode))
    {
	for (i=0; i<nz; i++)
	  dummy = ZOLTAN_FILE_scanf (f, "%d %d %lg %lg", &I[i], &J[i], &val[2*i], &val[2*i+1]);
	if (dummy != 4) return MM_PREMATURE_EOF;
    }
    else if (mm_is_real(matcode))
    {
	for (i=0; i<nz; i++)
	{
	  dummy = ZOLTAN_FILE_scanf(f, "%d %d %lg\n", &I[i], &J[i], &val[i]);
	  if (dummy != 3) return MM_PREMATURE_EOF;

	}
    }

    else if (mm_is_pattern(matcode))
    {
      for (i=0; i<nz; i++)
	dummy = ZOLTAN_FILE_scanf(f, "%d %d", &I[i], &J[i]);
      if (dummy	!= 2) return MM_PREMATURE_EOF;
    }
    else
	return MM_UNSUPPORTED_TYPE;

    return 0;

}

int mm_read_mtx_crd_entry(ZOLTAN_FILE* f, int *I, int *J,
	double *real, double *imag, MM_typecode matcode)
{
  int dummy;
  if (mm_is_complex(matcode))
    {
      dummy = ZOLTAN_FILE_scanf(f, "%d %d %lg %lg", I, J, real, imag);
      if (dummy != 4) return MM_PREMATURE_EOF;
    }
    else if (mm_is_real(matcode))
    {
      dummy = ZOLTAN_FILE_scanf(f, "%d %d %lg\n", I, J, real);
      if (dummy != 3) return MM_PREMATURE_EOF;
    }

    else if (mm_is_pattern(matcode))
    {
      dummy = ZOLTAN_FILE_scanf(f, "%d %d", I, J);
      if (dummy != 2) return MM_PREMATURE_EOF;
    }
    else
      return MM_UNSUPPORTED_TYPE;

    return 0;

}


/************************************************************************
    mm_read_mtx_crd()  fills M, N, nz, array of values, and return
			type code, e.g. 'MCRS'

			if matrix is complex, values[] is of size 2*nz,
			    (nz pairs of real/imaginary values)
************************************************************************/

int mm_read_mtx_crd(char *fname, int *M, int *N, int *nz, int **I, int **J,
	double **val, MM_typecode *matcode)
{
    int ret_code;
    ZOLTAN_FILE* f;

    if ((f = ZOLTAN_FILE_open(fname, "r", STANDARD)) == NULL)
      return MM_COULD_NOT_READ_FILE;


    if ((ret_code = mm_read_banner(f, matcode)) != 0)
	return ret_code;

    if (!(mm_is_valid(*matcode) && mm_is_sparse(*matcode) &&
	    mm_is_matrix(*matcode)))
	return MM_UNSUPPORTED_TYPE;

    if ((ret_code = mm_read_mtx_crd_size(f, M, N, nz)) != 0)
	return ret_code;


    *I = (int *)  malloc(*nz * sizeof(int));
    *J = (int *)  malloc(*nz * sizeof(int));
    *val = NULL;

    if (mm_is_complex(*matcode))
    {
	*val = (double *) malloc(*nz * 2 * sizeof(double));
	ret_code = mm_read_mtx_crd_data(f, *M, *N, *nz, *I, *J, *val,
		*matcode);
	if (ret_code != 0) return ret_code;
    }
    else if (mm_is_real(*matcode))
    {
	*val = (double *) malloc(*nz * sizeof(double));
	ret_code = mm_read_mtx_crd_data(f, *M, *N, *nz, *I, *J, *val,
		*matcode);
	if (ret_code != 0) return ret_code;
    }

    else if (mm_is_pattern(*matcode))
    {
	ret_code = mm_read_mtx_crd_data(f, *M, *N, *nz, *I, *J, *val,
		*matcode);
	if (ret_code != 0) return ret_code;
    }

    ZOLTAN_FILE_close(f);
    return 0;
}

int mm_write_banner(FILE *f, MM_typecode matcode)
{
    char *str = mm_typecode_to_str(matcode);
    int ret_code;

    ret_code = fprintf(f, "%s %s\n", MatrixMarketBanner, str);
    free(str);
    if (ret_code < 0 )
	return MM_COULD_NOT_WRITE_FILE;
    else
	return 0;
}

int mm_write_mtx_crd(char fname[], int M, int N, int nz, int I[], int J[],
	double val[], MM_typecode matcode)
{
    FILE *f;
    int i;

    if (strcmp(fname, "stdout") == 0)
	f = stdout;
    else
    if ((f = fopen(fname, "w")) == NULL)
	return MM_COULD_NOT_WRITE_FILE;

    /* print banner followed by typecode */
    fprintf(f, "%s ", MatrixMarketBanner);
    fprintf(f, "%s\n", mm_typecode_to_str(matcode));

    /* print matrix sizes and nonzeros */
    fprintf(f, "%d %d %d\n", M, N, nz);

    /* print values */
    if (mm_is_pattern(matcode))
	for (i=0; i<nz; i++)
	    fprintf(f, "%d %d\n", I[i], J[i]);
    else
    if (mm_is_real(matcode))
	for (i=0; i<nz; i++)
	    fprintf(f, "%d %d %20.16g\n", I[i], J[i], val[i]);
    else
    if (mm_is_complex(matcode))
	for (i=0; i<nz; i++)
	    fprintf(f, "%d %d %20.16g %20.16g\n", I[i], J[i], val[2*i],
			val[2*i+1]);
    else
    {
	if (f != stdout) fclose(f);
	return MM_UNSUPPORTED_TYPE;
    }

    if (f !=stdout) fclose(f);

    return 0;
}


char  *mm_typecode_to_str(MM_typecode matcode)
{
    static char buffer[MM_MAX_LINE_LENGTH];
    const char *types[4];

    /* check for MTX type */
    if (mm_is_matrix(matcode))
	types[0] = MM_MTX_STR;
    else
	return NULL;

    /* check for CRD or ARR matrix */
    if (mm_is_sparse(matcode))
	types[1] = MM_SPARSE_STR;
    else
    if (mm_is_dense(matcode))
	types[1] = MM_DENSE_STR;
    else
	return NULL;

    /* check for element data type */
    if (mm_is_real(matcode))
	types[2] = MM_REAL_STR;
    else
    if (mm_is_complex(matcode))
	types[2] = MM_COMPLEX_STR;
    else
    if (mm_is_pattern(matcode))
	types[2] = MM_PATTERN_STR;
    else
    if (mm_is_integer(matcode))
	types[2] = MM_INT_STR;
    else
	return NULL;


    /* check for symmetry type */
    if (mm_is_general(matcode))
	types[3] = MM_GENERAL_STR;
    else
    if (mm_is_symmetric(matcode))
	types[3] = MM_SYMM_STR;
    else
    if (mm_is_hermitian(matcode))
	types[3] = MM_HERM_STR;
    else
    if (mm_is_skew(matcode))
	types[3] = MM_SKEW_STR;
    else
	return NULL;

    sprintf(buffer,"%s %s %s %s", types[0], types[1], types[2], types[3]);
    return & buffer[0];

}
