/*
 * Copyright 2005-2018 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.
 */

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

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_padding
   IMPLEMENTS = init;preferred_size
   MEMBERS    = int preserve
   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 void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);
static size_t preferred_size(grib_accessor*,int);

typedef struct grib_accessor_section_padding {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in bytes */
/* Members defined in padding */
/* Members defined in section_padding */
	int preserve;
} grib_accessor_section_padding;

extern grib_accessor_class* grib_accessor_class_padding;

static grib_accessor_class _grib_accessor_class_section_padding = {
    &grib_accessor_class_padding,                      /* super                     */
    "section_padding",                      /* name                      */
    sizeof(grib_accessor_section_padding),  /* 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      */
    0,                /* 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   */
    &preferred_size,            /* 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_section_padding = &_grib_accessor_class_section_padding;


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->unpack_long	=	(*(c->super))->unpack_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->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 size_t preferred_size(grib_accessor* a, int from_handle)
{
  grib_accessor_section_padding* self = (grib_accessor_section_padding*)a;
  grib_accessor *b = a;
  grib_accessor* section_length = 0;
  long length = 0;
  size_t size = 1;

  long alength = 0;

  if(!from_handle)
  {
    if(self->preserve)
      return a->length;
    else
      return 0;
  }

  /* The section length should be a parameter */
  while(section_length == NULL && b != NULL)
  {
    section_length = b->parent->aclength;
    b = b->parent->owner;
  }

  if(!section_length)
  {
    /* printf("PADDING is no !section_length\n"); */
    return 0;
  }

  if(grib_unpack_long(section_length,&length,&size) == GRIB_SUCCESS)
  {
    if(length)
      alength = length - a->offset + section_length->parent->owner->offset;
    else
      alength = 0;

    /*Assert(a->length>=0);*/

   if (alength<0) alength=0;

    /* printf("PADDING is %ld\n",a->length); */
  }
  else
  {
    /* printf("PADDING unpack fails\n"); */
  }

  return alength;
}

static void init(grib_accessor* a, const long len, grib_arguments*arg )
{
  grib_accessor_section_padding* self = (grib_accessor_section_padding*)a;
  self->preserve = 1; /* This should be a parameter */
  a->length         = preferred_size(a,1);

}
