/*
 * 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.
 */

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

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = init;get_native_type;unpack_string
   IMPLEMENTS = byte_count; byte_offset
   MEMBERS = const char* sectionOffset
   MEMBERS = const char* sectionLength
   MEMBERS = long sectionNumber
   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  get_native_type(grib_accessor*);
static int unpack_string (grib_accessor*, char*, size_t *len);
static long byte_count(grib_accessor*);
static long byte_offset(grib_accessor*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_section_pointer {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in section_pointer */
	const char* sectionOffset;
	const char* sectionLength;
	long sectionNumber;
} grib_accessor_section_pointer;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_section_pointer = {
    &grib_accessor_class_gen,                      /* super                     */
    "section_pointer",                      /* name                      */
    sizeof(grib_accessor_section_pointer),  /* 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      */
    &byte_count,                 /* get number of bytes      */
    &byte_offset,                /* get offset to bytes           */
    &get_native_type,            /* 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    */
    &unpack_string,              /* 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_section_pointer = &_grib_accessor_class_section_pointer;


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->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->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 len , grib_arguments* arg)
{
  int n=0;
  grib_accessor_section_pointer* self=(grib_accessor_section_pointer*)a;
  
  self->sectionOffset = grib_arguments_get_name(grib_handle_of_accessor(a),arg,n++);
  self->sectionLength = grib_arguments_get_name(grib_handle_of_accessor(a),arg,n++);
  self->sectionNumber = grib_arguments_get_long(grib_handle_of_accessor(a),arg,n++);

  Assert (self->sectionNumber < MAX_NUM_SECTIONS );
  
  grib_handle_of_accessor(a)->section_offset[self->sectionNumber]=(char*)self->sectionOffset;
  grib_handle_of_accessor(a)->section_length[self->sectionNumber]=(char*)self->sectionLength;

  /* printf("++++++++++++++ GRIB_API:  creating section_pointer%d %s %s\n", */
	  /* self->sectionNumber,self->sectionLength,self->sectionLength); */

  if( grib_handle_of_accessor(a)->sections_count < self->sectionNumber)
  	grib_handle_of_accessor(a)->sections_count=self->sectionNumber;
  
  a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
  a->flags |= GRIB_ACCESSOR_FLAG_HIDDEN;
  a->flags |= GRIB_ACCESSOR_FLAG_FUNCTION;
  a->flags |= GRIB_ACCESSOR_FLAG_EDITION_SPECIFIC;
  a->length = 0;
}

static int get_native_type(grib_accessor* a)
{
  return GRIB_TYPE_BYTES;
}


static int unpack_string(grib_accessor *a , char*  v, size_t *len){
  /*
  unsigned char* p=NULL;
  char* s=v;
  int i;
  long length=grib_byte_count(a);

  if (*len < length) return GRIB_ARRAY_TOO_SMALL;
  
  p  = grib_handle_of_accessor(a)->buffer->data + grib_byte_offset(a);
  
  for (i = 0; i < length; i++)  {
    sprintf (s,"%02x", *(p++));
    s+=2;
  }
  
  *len=length;
  */
  sprintf(v,"%ld_%ld",grib_byte_offset(a),grib_byte_count(a));
  return GRIB_SUCCESS;
}

static long byte_count(grib_accessor* a){
  grib_accessor_section_pointer* self=(grib_accessor_section_pointer*)a;
  long sectionLength=0;
  int ret=0;
  
  ret=grib_get_long(grib_handle_of_accessor(a),self->sectionLength,&sectionLength);
  if (ret) {
    grib_context_log(a->context,GRIB_LOG_ERROR,
                     "unable to get %s %s",
                     self->sectionLength,grib_get_error_message(ret));
    return -1;
  }
  
  return sectionLength;
}

static long byte_offset(grib_accessor* a){
  grib_accessor_section_pointer* self=(grib_accessor_section_pointer*)a;
  long sectionOffset=0;
  int ret=0;
  
  ret=grib_get_long(grib_handle_of_accessor(a),self->sectionOffset,&sectionOffset);
  if (ret) {
    grib_context_log(a->context,GRIB_LOG_ERROR,
                     "unable to get %s %s",
                     self->sectionOffset,grib_get_error_message(ret));
    return -1;
  }
  
  return sectionOffset;
}

