/**
* 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 "grib_api_internal.h"

/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_data_secondary_bitmap
   IMPLEMENTS = init
   IMPLEMENTS = pack_double
   IMPLEMENTS = value_count
   MEMBERS=const char*  number_of_values
   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 pack_double(grib_accessor*, const double* val,size_t *len);
static long value_count(grib_accessor*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_data_g2secondary_bitmap {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in data_secondary_bitmap */
	const char*  primary_bitmap;
	const char*  secondary_bitmap;
	const char*  missing_value;
	const char*  expand_by;
/* Members defined in data_g2secondary_bitmap */
	const char*  number_of_values;
} grib_accessor_data_g2secondary_bitmap;

extern grib_accessor_class* grib_accessor_class_data_secondary_bitmap;

static grib_accessor_class _grib_accessor_class_data_g2secondary_bitmap = {
    &grib_accessor_class_data_secondary_bitmap,                      /* super                     */
    "data_g2secondary_bitmap",                      /* name                      */
    sizeof(grib_accessor_data_g2secondary_bitmap),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    0,                       /* describes himself         */
    0,                /* get length of section     */
    &value_count,                /* 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    */
    &pack_double,                /* grib_pack procedures double    */
    0,              /* grib_unpack procedures double  */
    0,                /* grib_pack procedures string    */
    0,              /* 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_data_g2secondary_bitmap = &_grib_accessor_class_data_g2secondary_bitmap;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	c->next_offset	=	(*(c->super))->next_offset;
	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->unpack_double	=	(*(c->super))->unpack_double;
	c->pack_string	=	(*(c->super))->pack_string;
	c->unpack_string	=	(*(c->super))->unpack_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 void init(grib_accessor* a,const long v, grib_arguments* args)
{
  grib_accessor_data_g2secondary_bitmap *self =(grib_accessor_data_g2secondary_bitmap*)a;
  self->number_of_values   = grib_arguments_get_name(a->parent->h,args,4);
}



static long value_count(grib_accessor* a)
{
  grib_accessor_data_g2secondary_bitmap *self =(grib_accessor_data_g2secondary_bitmap*)a;
  int err = 0;
  long len;

  if((err = grib_get_long_internal(a->parent->h,self->number_of_values,&len)) != GRIB_SUCCESS)
    return 0;

return len;
}


static int pack_double(grib_accessor* a, const double* val, size_t *len)
{
  grib_accessor_data_g2secondary_bitmap* self =  (grib_accessor_data_g2secondary_bitmap*)a;

  int err = 0;

  long primary_len = 0;
  long secondary_len = 0;
  double* primary_bitmap = NULL;
  double* secondary_bitmap = NULL;
  long i = 0;
  long j = 0;
  long on = 0;
  long k;
  long m;
  double missing_value = 0;
  double present_value = 0;
  long expand_by =0;

  if (*len ==0) return GRIB_NO_VALUES;

  if((err = grib_get_long(a->parent->h,self->expand_by,&expand_by)) != GRIB_SUCCESS)
    return err;

  if((err = grib_get_double_internal(a->parent->h,self->missing_value,&missing_value)) != GRIB_SUCCESS)
    return err;

  Assert(expand_by);

  if(*len % expand_by)
  {
    /*TODO: issue warning */
    return GRIB_ENCODING_ERROR;
  }

  primary_len = *len / expand_by;
  primary_bitmap= grib_context_malloc_clear(a->parent->h->context,primary_len*sizeof(double));
  if(!primary_bitmap) return GRIB_OUT_OF_MEMORY;

  secondary_len = *len ;
  secondary_bitmap= grib_context_malloc_clear(a->parent->h->context,secondary_len*sizeof(double));
  if(!secondary_bitmap) {
    grib_context_free(a->parent->h->context,primary_bitmap);
    return GRIB_OUT_OF_MEMORY;
  }

  if(missing_value == 0)
    present_value = 1;
  else
    present_value = 0;

  k = 0;
  m = 0;
  for(i=0; i<*len ; i += expand_by)
  {
    int cnt = 0;
    for(j = 0; j < expand_by; j++)
      if(val[i+j] == missing_value)
        cnt++;

    if(cnt == expand_by) /* all expand_by values are missing */
      primary_bitmap[k++] = missing_value;
    else {
      primary_bitmap[k++] = present_value;
      for(j = 0; j < expand_by; j++)
        secondary_bitmap[m++] = val[i+j];
      on++;
    }
  }

  *len = k;

  Assert(k == primary_len);

  err = grib_set_double_array_internal(a->parent->h,self->primary_bitmap,primary_bitmap,k);
  if(err == GRIB_SUCCESS)
    err = grib_set_double_array_internal(a->parent->h,self->secondary_bitmap,secondary_bitmap,m);

  grib_context_free(a->parent->h->context,primary_bitmap);
  grib_context_free(a->parent->h->context,secondary_bitmap);

  if(err == GRIB_SUCCESS)
    err = grib_set_long_internal(a->parent->h,self->number_of_values,*len * expand_by);

  return err;
}
