/**
* Copyright 2005-2007 ECMWF
*
* Licensed under the GNU Lesser General Public License which
* incorporates the terms and conditions of version 3 of the GNU
* General Public License.
* See LICENSE and gpl-3.0.txt for details.
*/

#include <math.h>
#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_evaluate
   IMPLEMENTS = unpack_double
   IMPLEMENTS = unpack_string
   END_CLASS_DEF

 */

/* START_CLASS_IMP */

/*

Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
Instead edit values between START_CLASS_DEF and END_CLASS_DEF
or edit "accessor.class" and rerun ./make_class.pl

*/

static int unpack_double(grib_accessor*, double* val,size_t *len);
static int unpack_string (grib_accessor*, char*, size_t *len);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_round {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in long */
/* Members defined in evaluate */
	grib_arguments* arg;
/* Members defined in round */
} grib_accessor_round;

extern grib_accessor_class* grib_accessor_class_evaluate;

static grib_accessor_class _grib_accessor_class_round = {
    &grib_accessor_class_evaluate,                      /* super                     */
    "round",                      /* name                      */
    sizeof(grib_accessor_round),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    0,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    0,                       /* describes himself         */
    0,                /* get length of section     */
    0,                /* get number of values      */
    0,                 /* get number of bytes      */
    0,                /* get offset to bytes           */
    0,            /* get native type               */
    0,                /* get sub_section                */
    0,               /* grib_pack procedures long      */
    0,               /* grib_pack procedures long      */
    0,                  /* grib_pack procedures long      */
    0,                /* grib_unpack procedures long    */
    0,                /* grib_pack procedures double    */
    &unpack_double,              /* grib_unpack procedures double  */
    0,                /* grib_pack procedures string    */
    &unpack_string,              /* grib_unpack procedures string  */
    0,                 /* grib_pack procedures bytes     */
    0,               /* grib_unpack procedures bytes   */
    0,            /* pack_expression */
    0,              /* notify_change   */
    0,                /* update_size   */
    0,            /* preferred_size   */
    0,                    /* resize   */
    0,      /* nearest_smaller_value */
    0,                       /* next accessor    */
    0,                    /* compare vs. another accessor   */
    0,     /* unpack only ith value          */
    0,     /* unpack a subarray         */
    0,             		/* clear          */
};


grib_accessor_class* grib_accessor_class_round = &_grib_accessor_class_round;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	c->next_offset	=	(*(c->super))->next_offset;
	c->value_count	=	(*(c->super))->value_count;
	c->byte_count	=	(*(c->super))->byte_count;
	c->byte_offset	=	(*(c->super))->byte_offset;
	c->get_native_type	=	(*(c->super))->get_native_type;
	c->sub_section	=	(*(c->super))->sub_section;
	c->pack_missing	=	(*(c->super))->pack_missing;
	c->is_missing	=	(*(c->super))->is_missing;
	c->pack_long	=	(*(c->super))->pack_long;
	c->unpack_long	=	(*(c->super))->unpack_long;
	c->pack_double	=	(*(c->super))->pack_double;
	c->pack_string	=	(*(c->super))->pack_string;
	c->pack_bytes	=	(*(c->super))->pack_bytes;
	c->unpack_bytes	=	(*(c->super))->unpack_bytes;
	c->pack_expression	=	(*(c->super))->pack_expression;
	c->notify_change	=	(*(c->super))->notify_change;
	c->update_size	=	(*(c->super))->update_size;
	c->preferred_size	=	(*(c->super))->preferred_size;
	c->resize	=	(*(c->super))->resize;
	c->nearest_smaller_value	=	(*(c->super))->nearest_smaller_value;
	c->next	=	(*(c->super))->next;
	c->compare	=	(*(c->super))->compare;
	c->unpack_double_element	=	(*(c->super))->unpack_double_element;
	c->unpack_double_subarray	=	(*(c->super))->unpack_double_subarray;
	c->clear	=	(*(c->super))->clear;
}

/* END_CLASS_IMP */



static int    unpack_double(grib_accessor* a, double* val, size_t *len)
{
  grib_accessor_round* self = (grib_accessor_round*)a;


  int ret = GRIB_SUCCESS;

  size_t replen = 0;
  double rounding_precision = 0;
  double rounded = 0;
  double toround = 0;

  const char* oval = NULL;
  oval     = grib_arguments_get_name(a->parent->h,self->arg,0);


  if( (ret = grib_get_double_internal(a->parent->h, oval, &toround)) != 0)
    return ret;

  rounding_precision = grib_arguments_get_long(a->parent->h,self->arg,1);

  rounded = floor(rounding_precision * toround + 0.5) / rounding_precision;



  *len = replen;

  *val = rounded;

  return ret;
}

static int    unpack_string(grib_accessor* a, char* val, size_t *len)
{


  char result[1024]  ;
  int ret = GRIB_SUCCESS;
  size_t replen = 1;

  double value = 0;

  ret = unpack_double(a, &value, &replen);

  sprintf(result,"%.3f",value);

  replen = strlen(result)+1;

  if(*len < replen){
    *len = replen;
    return GRIB_ARRAY_TOO_SMALL;
  }

  *len = replen;

  sprintf(val,"%s",result);

  return GRIB_SUCCESS;
}