/*
 * Copyright 2005-2017 ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */
/*****************************
 *  Enrico Fucile
 ****************************/

#include "grib_api_internal.h"
#define PRECISION_32_IEEE  1
#define PRECISION_64_IEEE  2
#define PRECISION_128_IEEE 3

#define COMPRESSION_NONE    0
#define COMPRESSION_LZW     1

#define PRE_PROCESSING_NONE       0
#define PRE_PROCESSING_DIFFERENCE 1
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = init
   IMPLEMENTS = unpack_long
   MEMBERS=const char*   values
   MEMBERS=const char*   precision
   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_long(grib_accessor*, long* val,size_t *len);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_number_of_values_data_raw_packing {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in number_of_values_data_raw_packing */
	const char*   values;
	const char*   precision;
} grib_accessor_number_of_values_data_raw_packing;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_number_of_values_data_raw_packing = {
    &grib_accessor_class_gen,                      /* super                     */
    "number_of_values_data_raw_packing",                      /* name                      */
    sizeof(grib_accessor_number_of_values_data_raw_packing),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    0,                       /* describes himself         */
    0,                /* get length of section     */
    0,              /* get length of string      */
    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      */
    &unpack_long,                /* grib_unpack procedures long    */
    0,                /* grib_pack procedures double    */
    0,              /* grib_unpack procedures double  */
    0,                /* grib_pack procedures string    */
    0,              /* grib_unpack procedures string  */
    0,          /* grib_pack array procedures string    */
    0,        /* grib_unpack array 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          */
    0,               		/* clone accessor          */
};


grib_accessor_class* grib_accessor_class_number_of_values_data_raw_packing = &_grib_accessor_class_number_of_values_data_raw_packing;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	c->next_offset	=	(*(c->super))->next_offset;
	c->string_length	=	(*(c->super))->string_length;
	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->pack_double	=	(*(c->super))->pack_double;
	c->unpack_double	=	(*(c->super))->unpack_double;
	c->pack_string	=	(*(c->super))->pack_string;
	c->unpack_string	=	(*(c->super))->unpack_string;
	c->pack_string_array	=	(*(c->super))->pack_string_array;
	c->unpack_string_array	=	(*(c->super))->unpack_string_array;
	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;
	c->make_clone	=	(*(c->super))->make_clone;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a,const long v, grib_arguments* args)
{
  int n=0;
  grib_accessor_number_of_values_data_raw_packing *self =(grib_accessor_number_of_values_data_raw_packing*)a;
  
  self->values       = grib_arguments_get_name(grib_handle_of_accessor(a),args,n++);
  self->precision       = grib_arguments_get_name(grib_handle_of_accessor(a),args,n++);
  a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
  a->length=0;
}

static int  unpack_long(grib_accessor* a, long* val, size_t *len)
{
  int err=0;
  grib_accessor_number_of_values_data_raw_packing *self =(grib_accessor_number_of_values_data_raw_packing*)a;
  grib_accessor* adata=NULL;
  long precision = 0;
  int bytes=0;
  long byte_count =0;

  adata=grib_find_accessor(grib_handle_of_accessor(a),self->values);
  Assert(adata!=NULL);
  byte_count=grib_byte_count(adata);

  if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->precision,&precision))
      != GRIB_SUCCESS)
    return err;

  switch(precision)
  {
    case 1:
      bytes = 4;
      break;

    case 2:
      bytes = 8;
      break;

    default:
      return GRIB_NOT_IMPLEMENTED;
      break;
  }

  *val = byte_count / bytes;

  return err;
}


