/*********************************************************************
 *   Copyright 2018, UCAR/Unidata
 *   See netcdf/COPYRIGHT file for copying and redistribution conditions.
 *   $Id: load.c,v 1.35 2009/11/17 18:15:08 dmh Exp $
 *********************************************************************/

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <netcdf.h>
#include "generic.h"
#include "ncgen.h"
#include "genlib.h"

extern int netcdf_flag;
extern int c_flag;
extern int fortran_flag;

#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define fpr    (void) fprintf


/*
 * Remove trailing zeros (after decimal point) but not trailing decimal
 * point from ss, a string representation of a floating-point number that
 * might include an exponent part.
 */
static void
tztrim(
    char *ss			/* returned string representing dd */
    )
{
    char *cp, *ep;

    cp = ss;
    if (*cp == '-')
      cp++;
    while(isdigit((int)*cp) || *cp == '.')
      cp++;
    if (*--cp == '.')
      return;
    ep = cp+1;
    while (*cp == '0')
      cp--;
    cp++;
    if (cp == ep)
      return;
    while (*ep)
      *cp++ = *ep++;
    *cp = '\0';
    return;
}


/* generate C to put netCDF record from in-memory data */
static void
gen_load_c(
    void *rec_start
    )
{
    int  idim, ival;
    char *val_string = NULL;
    char *charvalp = NULL;
    short *shortvalp = NULL;
    int *intvalp = NULL;
    float *floatvalp = NULL;
    double *doublevalp = NULL;
    char stmnt[C_MAX_STMNT];
    size_t stmnt_len;
    char s2[C_MAX_STMNT] = {'\0'};

    if (!vars[varnum].has_data)
	return;

    cline("");
    snprintf(stmnt, sizeof(stmnt), "   {\t\t\t/* store %s */", vars[varnum].name);
    cline(stmnt);

    if (vars[varnum].ndims > 0) {
	if (vars[varnum].dims[0] == rec_dim) {
	    snprintf(stmnt, sizeof(stmnt), "    static size_t %s_start[RANK_%s];",
		    vars[varnum].lname, vars[varnum].lname);
	    cline(stmnt);

	    snprintf(stmnt, sizeof(stmnt), "    static size_t %s_count[RANK_%s];",
		    vars[varnum].lname, vars[varnum].lname);
	    cline(stmnt);
	}

	/* load variable with data values using static initialization */
	snprintf(stmnt, sizeof(stmnt), "    static %s %s[] = {",
		ncctype(vars[varnum].type),
		vars[varnum].lname);

	stmnt_len = strlen(stmnt);
	switch (vars[varnum].type) {
	  case NC_CHAR:
	    val_string = cstrstr((char *) rec_start, var_len);
	    snprintf(s2, sizeof(s2), "%s", val_string);
	    strlcat(stmnt, s2, C_MAX_STMNT);
	    free(val_string);
	    break;
	  default:
	    switch (vars[varnum].type) {
	      case NC_BYTE:
		charvalp = (char *) rec_start;
		break;
	      case NC_SHORT:
		shortvalp = (short *) rec_start;
		break;
	      case NC_INT:
		intvalp = (int *) rec_start;
		break;
	      case NC_FLOAT:
		floatvalp = (float *) rec_start;
		break;
	      case NC_DOUBLE:
		doublevalp = (double *) rec_start;
		break;
	      default: break;
	    }
            for (ival = 0; ival < var_len-1; ival++) {
		switch (vars[varnum].type) {
		  case NC_BYTE:
		    assert(charvalp != NULL);
		    snprintf(s2, sizeof(s2), "%d, ", *charvalp++);
		    break;
		  case NC_SHORT:
		    assert(shortvalp != NULL);
		    snprintf(s2, sizeof(s2), "%d, ", *shortvalp++);
		    break;
		  case NC_INT:
		    assert(intvalp != NULL);
		    snprintf(s2, sizeof(s2), "%ld, ", (long)*intvalp++);
		    break;
		  case NC_FLOAT:
		    assert(floatvalp != NULL);
		    snprintf(s2, sizeof(s2), "%.8g, ", *floatvalp++);
		    break;
		  case NC_DOUBLE:
		    assert(doublevalp != NULL);
		    snprintf(s2, sizeof(s2), "%#.16g", *doublevalp++);
		    tztrim(s2);
		    strcat(s2, ", ");
		    break;
		  default: break;
		}
		stmnt_len += strlen(s2);
		if (stmnt_len < C_MAX_STMNT)
		  strcat(stmnt, s2);
		else {
		    cline(stmnt);
		    strcpy(stmnt,s2);
		    stmnt_len = strlen(stmnt);
		}
	    }
	    for (;ival < var_len; ival++) {
	      switch (vars[varnum].type) {
	      case NC_BYTE:
		assert(charvalp != NULL);
		snprintf(s2, sizeof(s2), "%d", *charvalp);
		break;
	      case NC_SHORT:
		assert(shortvalp != NULL);
		snprintf(s2, sizeof(s2), "%d", *shortvalp);
		break;
	      case NC_INT:
		assert(intvalp != NULL);
		snprintf(s2, sizeof(s2), "%ld", (long)*intvalp);
		break;
	      case NC_FLOAT:
		assert(floatvalp != NULL);
		snprintf(s2, sizeof(s2), "%.8g", *floatvalp);
		break;
	      case NC_DOUBLE:
		assert(doublevalp != NULL);
		snprintf(s2, sizeof(s2), "%#.16g", *doublevalp++);
		tztrim(s2);
		break;
	      default: break;
	      }
	      stmnt_len += strlen(s2);
	      if (stmnt_len < C_MAX_STMNT)
		strcat(stmnt, s2);
	      else {
		cline(stmnt);
		strcpy(stmnt,s2);
		stmnt_len = strlen(stmnt);
	      }
	    }
	    break;
	}
	strcat(stmnt,"};");
	cline(stmnt);

	if (vars[varnum].dims[0] == rec_dim) {
	    snprintf(stmnt, sizeof(stmnt),
		    "    %s_len = %lu;			/* number of records of %s data */",
		    dims[rec_dim].lname,
		    (unsigned long)vars[varnum].nrecs, /* number of recs for this variable */
		    vars[varnum].name);
	    cline(stmnt);

	    for (idim = 0; idim < vars[varnum].ndims; idim++) {
		snprintf(stmnt, sizeof(stmnt), "    %s_start[%d] = 0;",
			vars[varnum].lname,
			idim);
		cline(stmnt);
	    }

	    for (idim = 0; idim < vars[varnum].ndims; idim++) {
		snprintf(stmnt, sizeof(stmnt), "    %s_count[%d] = %s_len;",
			vars[varnum].lname,
			idim,
			dims[vars[varnum].dims[idim]].lname);
		cline(stmnt);
	    }
	}

	if (vars[varnum].dims[0] == rec_dim) {
	    snprintf(stmnt, sizeof(stmnt),
		    "    stat = nc_put_vara_%s(ncid, %s_id, %s_start, %s_count, %s);",
		    ncstype(vars[varnum].type),
		    vars[varnum].lname,
		    vars[varnum].lname,
		    vars[varnum].lname,
		    vars[varnum].lname);
	} else {		/* non-record variables */
	    snprintf(stmnt, sizeof(stmnt),
		    "    stat = nc_put_var_%s(ncid, %s_id, %s);",
		    ncstype(vars[varnum].type),
		    vars[varnum].lname,
		    vars[varnum].lname);
	}
	cline(stmnt);
    } else {			/* scalar variables */
	/* load variable with data values using static initialization */
	snprintf(stmnt, sizeof(stmnt), "    static %s %s = ",
		ncctype(vars[varnum].type),
		vars[varnum].lname);

	switch (vars[varnum].type) {
	  case NC_CHAR:
	    val_string = cstrstr((char *) rec_start, var_len);
	    val_string[strlen(val_string)-1] = '\0';
	    snprintf(s2, sizeof(s2), "'%s'", &val_string[1]);
	    free(val_string);
	    break;
	  case NC_BYTE:
	    charvalp = (char *) rec_start;
	    snprintf(s2, sizeof(s2), "%d", *charvalp);
	    break;
	  case NC_SHORT:
	    shortvalp = (short *) rec_start;
	    snprintf(s2, sizeof(s2), "%d", *shortvalp);
	    break;
	  case NC_INT:
	    intvalp = (int *) rec_start;
	    snprintf(s2, sizeof(s2), "%ld", (long)*intvalp);
	    break;
	  case NC_FLOAT:
	    floatvalp = (float *) rec_start;
	    snprintf(s2, sizeof(s2), "%.8g", *floatvalp);
	    break;
	  case NC_DOUBLE:
	    doublevalp = (double *) rec_start;
	    snprintf(s2, sizeof(s2), "%#.16g", *doublevalp++);
	    tztrim(s2);
	    break;
	  default: break;
	}
	strlcat(stmnt, s2, C_MAX_STMNT);
	strlcat(stmnt,";", C_MAX_STMNT);
	cline(stmnt);
	snprintf(stmnt, sizeof(stmnt),
		"    stat = nc_put_var_%s(ncid, %s_id, &%s);",
		ncstype(vars[varnum].type),
		vars[varnum].lname,
		vars[varnum].lname);
	cline(stmnt);
    }
    cline("    check_err(stat,__LINE__,__FILE__);");
    cline("   }");
}


/*
 * Add to a partial Fortran statement, checking if it's too long.  If it is too
 * long, output the first part of it as a single statement with continuation
 * characters and start a new (probably invalid) statement with the remainder.
 * This will cause a Fortran compiler error, but at least all the information
 * will be available.
 */
static void
fstrcat(
    char *s,			/* source string of stement being built */
    const char *t,		/* string to be appended to source */
    size_t *slenp		/* pointer to length of source string */
    )
{
  size_t slen = *slenp;

  *slenp += strlen(t);

  if (*slenp >= FORT_MAX_STMNT) {
    derror("FORTRAN statement too long: %s",s);
    fline(s);
    strncpy(s, t, FORT_MAX_STMNT);
    *slenp = strlen(s);
  } else {
    /* Suppress a coverity-related issue without actually
       ignoring it in the coverity dashboard. */
    /* coverity[unsigned_compare] */
#if 0
    strncat(s, t, MAX(0,MIN(strlen(t),strlen(s)-(strlen(t)))));
#else
    strlcat(s, t, slen);
#endif
  }
}

/*
 * Create Fortran data statement to initialize numeric variable with
 * values.
 */
static void
f_var_init(
    int varnum,			/* which variable */
    void *rec_start		/* start of data */
    )
{
    char *val_string;
    char *charvalp;
    short *shortvalp;
    int *intvalp;
    float *floatvalp;
    double *doublevalp;
    char stmnt[FORT_MAX_STMNT];
    size_t stmnt_len;
    char s2[FORT_MAX_STMNT];
    int ival;

    /* load variable with data values  */
    snprintf(stmnt, sizeof(stmnt), "data %s /",vars[varnum].lname);
    stmnt_len = strlen(stmnt);
    switch (vars[varnum].type) {
    case NC_BYTE:
	charvalp = (char *) rec_start;
	for (ival = 0; ival < var_len-1; ival++) {
	    val_string = fstring(NC_BYTE,(void *)charvalp++,0);
	    snprintf(s2, sizeof(s2), "%s, ", val_string);
	    fstrcat(stmnt, s2, &stmnt_len);
	    free(val_string);
	}
	val_string = fstring(NC_BYTE,(void *)charvalp++,0);
	fstrcat(stmnt, val_string, &stmnt_len);
	free(val_string);
	break;
    case NC_SHORT:
	shortvalp = (short *) rec_start;
	for (ival = 0; ival < var_len-1; ival++) {
	    snprintf(s2, sizeof(s2), "%d, ", *shortvalp++);
	    fstrcat(stmnt, s2, &stmnt_len);
	}
	snprintf(s2, sizeof(s2), "%d", *shortvalp);
	fstrcat(stmnt, s2, &stmnt_len);
	break;
    case NC_INT:
	intvalp = (int *) rec_start;
	for (ival = 0; ival < var_len-1; ival++) {
	    snprintf(s2, sizeof(s2), "%ld, ", (long)*intvalp++);
	    fstrcat(stmnt, s2, &stmnt_len);
	}
	snprintf(s2, sizeof(s2), "%ld", (long)*intvalp);
	fstrcat(stmnt, s2, &stmnt_len);
	break;
    case NC_FLOAT:
	floatvalp = (float *) rec_start;
	for (ival = 0; ival < var_len-1; ival++) {
	    snprintf(s2, sizeof(s2), "%.8g, ", *floatvalp++);
	    fstrcat(stmnt, s2, &stmnt_len);
	}
	snprintf(s2, sizeof(s2), "%.8g", *floatvalp);
	fstrcat(stmnt, s2, &stmnt_len);
	break;
    case NC_DOUBLE:
	doublevalp = (double *) rec_start;
	for (ival = 0; ival < var_len-1; ival++) {
	    snprintf(s2, sizeof(s2), "%#.16g", *doublevalp++);
	    tztrim(s2);
	    expe2d(s2);	/* change 'e' to 'd' in exponent */
	    fstrcat(s2, ", ", &stmnt_len);
	    fstrcat(stmnt, s2, &stmnt_len);
	}
	snprintf(s2, sizeof(s2), "%#.16g", *doublevalp++);
	tztrim(s2);
	expe2d(s2);
	fstrcat(stmnt, s2, &stmnt_len);
	break;
    default:
	derror("fstrstr: bad type");
	break;
    }
    fstrcat(stmnt, "/", &stmnt_len);

    /* For record variables, store data statement for later use;
      otherwise, just print it. */
    if (vars[varnum].ndims > 0 && vars[varnum].dims[0] == rec_dim) {
	char *dup_stmnt = emalloc(strlen(stmnt)+1);
	strcpy(dup_stmnt, stmnt); /* ULTRIX missing strdup */
	vars[varnum].data_stmnt = dup_stmnt;
    } else {
	fline(stmnt);
    }
}


/* make Fortran to put record */
static void
gen_load_fortran(
    void *rec_start
    )
{
    char stmnt[FORT_MAX_STMNT];
    struct vars *v = &vars[varnum];

    if (!v->has_data)
	return;

    if (v->ndims == 0 || v->dims[0] != rec_dim) {
	snprintf(stmnt, sizeof(stmnt), "* store %s", v->name);
	fline(stmnt);
    }

    /* generate code to initialize variable with values found in CDL input */
    if (v->type != NC_CHAR) {
	f_var_init(varnum, rec_start);
    } else {
	v->data_stmnt = fstrstr(rec_start, valnum);
    }

    if (v->ndims >0 && v->dims[0] == rec_dim) {
	return;
    }
    if (v->type != NC_CHAR) {
	snprintf(stmnt, sizeof(stmnt), "iret = nf_put_var_%s(ncid, %s_id, %s)",
		nfftype(v->type), v->lname, v->lname);
    } else {
	char *char_expr = fstrstr(rec_start, valnum);
	if(strlen("iret = nf_put_var_(ncid, _id, )") +
	   strlen(nfftype(v->type)) +
	   strlen(v->lname) +
	   strlen(char_expr) > FORT_MAX_STMNT) {
	    derror("FORTRAN statement to assign values to %s too long!",
		   v->lname);
	    exit(9);
	}
	snprintf(stmnt, sizeof(stmnt), "iret = nf_put_var_%s(ncid, %s_id, %s)",
		nfftype(v->type), v->lname, char_expr);
	free(char_expr);
    }

    fline(stmnt);
    fline("call check_err(iret)");
}


/* invoke netcdf calls (or generate C or Fortran code) to load netcdf variable
 * from in-memory data.  Assumes following global variables set from yacc
 * parser:
 * int varnum        - number of variable to be loaded.
 * struct vars[varnum] - structure containing info on variable, specifically
 *                     name, type, ndims, dims, fill_value, has_data
 * int rec_dim       - id of record dimension, or -1 if none
 * struct dims[]     - structure containing name and size of dimensions.
 */
int
put_variable(
    void *rec_start		/* points to data to be loaded  */
    )
{
    if (netcdf_flag)
      load_netcdf(rec_start);	/* put variable values */
    if (c_flag)			/* create C code to put values */
      gen_load_c(rec_start);
    if (fortran_flag)		/* create Fortran code to put values */
      gen_load_fortran(rec_start);

    return 0;
}


/* write out variable's data from in-memory structure */
void
load_netcdf(
    void *rec_start
    )
{
    int idim;
    int stat = NC_NOERR;
    size_t start[NC_MAX_VAR_DIMS];
    size_t count[NC_MAX_VAR_DIMS];
    char *charvalp;
    short *shortvalp;
    int *intvalp;
    float *floatvalp;
    double *doublevalp;

    /* load values into variable */

    switch (vars[varnum].type) {
      case NC_CHAR:
      case NC_BYTE:
	charvalp = (char *) rec_start;
	break;
      case NC_SHORT:
	shortvalp = (short *) rec_start;
	break;
      case NC_INT:
	intvalp = (int *) rec_start;
	break;
      case NC_FLOAT:
	floatvalp = (float *) rec_start;
	break;
      case NC_DOUBLE:
	doublevalp = (double *) rec_start;
	break;
      default: break;
    }
    if (vars[varnum].ndims > 0) {
	/* initialize start to upper left corner (0,0,0,...) */
	start[0] = 0;
	if (vars[varnum].dims[0] == rec_dim) {
	    count[0] = vars[varnum].nrecs;
	}
	else {
	    count[0] = dims[vars[varnum].dims[0]].size;
	}
    }

    for (idim = 1; idim < vars[varnum].ndims; idim++) {
	start[idim] = 0;
	count[idim] = dims[vars[varnum].dims[idim]].size;
    }

    switch (vars[varnum].type) {
      case NC_BYTE:
	stat = nc_put_vara_schar(ncid, varnum, start, count,
				 (signed char *)charvalp);
	break;
      case NC_CHAR:
	stat = nc_put_vara_text(ncid, varnum, start, count, charvalp);
	break;
      case NC_SHORT:
	stat = nc_put_vara_short(ncid, varnum, start, count, shortvalp);
	break;
      case NC_INT:
	stat = nc_put_vara_int(ncid, varnum, start, count, intvalp);
	break;
      case NC_FLOAT:
	stat = nc_put_vara_float(ncid, varnum, start, count, floatvalp);
	break;
      case NC_DOUBLE:
	stat = nc_put_vara_double(ncid, varnum, start, count, doublevalp);
	break;
      default: break;
    }
    check_err(stat);
}