/**
* 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_gen
   IMPLEMENTS = init
   IMPLEMENTS = unpack_double;unpack_double_element
   IMPLEMENTS = pack_double
   IMPLEMENTS = value_count
   IMPLEMENTS = dump;get_native_type
   MEMBERS=const char*  coded_values
   MEMBERS=const char*  bitmap
   MEMBERS=const char*  missing_value
   MEMBERS=const char*  number_of_data_points
   MEMBERS=const char*  number_of_values
   MEMBERS=const char*  binary_scale_factor
   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 pack_double(grib_accessor*, const double* val,size_t *len);
static int unpack_double(grib_accessor*, double* val,size_t *len);
static long value_count(grib_accessor*);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);
static int unpack_double_element(grib_accessor*,size_t i, double* val);

typedef struct grib_accessor_data_apply_bitmap {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in data_apply_bitmap */
	const char*  coded_values;
	const char*  bitmap;
	const char*  missing_value;
	const char*  number_of_data_points;
	const char*  number_of_values;
	const char*  binary_scale_factor;
} grib_accessor_data_apply_bitmap;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_data_apply_bitmap = {
    &grib_accessor_class_gen,                      /* super                     */
    "data_apply_bitmap",                      /* name                      */
    sizeof(grib_accessor_data_apply_bitmap),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    &dump,                       /* describes himself         */
    0,                /* get length of section     */
    &value_count,                /* get number of values      */
    0,                 /* get number of bytes      */
    0,                /* 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    */
    &pack_double,                /* grib_pack procedures double    */
    &unpack_double,              /* 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   */
    &unpack_double_element,     /* unpack only ith value          */
    0,     /* unpack a subarray         */
    0,             		/* clear          */
};


grib_accessor_class* grib_accessor_class_data_apply_bitmap = &_grib_accessor_class_data_apply_bitmap;


static void init_class(grib_accessor_class* c)
{
	c->next_offset	=	(*(c->super))->next_offset;
	c->byte_count	=	(*(c->super))->byte_count;
	c->byte_offset	=	(*(c->super))->byte_offset;
	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_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_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)
{
  int n=0;
  grib_accessor_data_apply_bitmap *self =(grib_accessor_data_apply_bitmap*)a;

  self->coded_values  = grib_arguments_get_name(a->parent->h,args,n++);
  self->bitmap        = grib_arguments_get_name(a->parent->h,args,n++);
  self->missing_value = grib_arguments_get_name(a->parent->h,args,n++);
  self->binary_scale_factor = grib_arguments_get_name(a->parent->h,args,n++);
  self->number_of_data_points = grib_arguments_get_name(a->parent->h,args,n++);
  self->number_of_values = grib_arguments_get_name(a->parent->h,args,n++);

  a->length = 0;
}
static void dump(grib_accessor* a, grib_dumper* dumper)
{
  grib_dump_values(dumper,a);
}


static long value_count(grib_accessor* a)
{
  grib_accessor_data_apply_bitmap *self =(grib_accessor_data_apply_bitmap*)a;
  size_t len = 0;
    int ret = 0;

    if(grib_find_accessor(a->parent->h,self->bitmap))
      ret =  grib_get_size(a->parent->h,self->bitmap,&len);
    else
      ret =  grib_get_size(a->parent->h,self->coded_values,&len);

    if(ret == GRIB_SUCCESS)
      return len;
   grib_context_log(a->parent->h->context, GRIB_LOG_DEBUG,
      "grib_accessor_data_simple_packing_bitmap : value_count : cannot get number of values %s",
      a->name);
    return 0;
}


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

  size_t i = 0;
  size_t j = 0;
  size_t n_vals = grib_value_count(a);
  size_t coded_n_vals = 0;

  int err = 0;
  double* coded_vals = NULL;

  double missing_value = 0;

  if(!grib_find_accessor(a->parent->h,self->bitmap))
      return grib_get_double_array_internal(a->parent->h,self->coded_values,val,len);

  if((err = grib_get_size(a->parent->h,self->coded_values,&coded_n_vals)) != GRIB_SUCCESS)
    return err;

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

  if (coded_n_vals==0) {
	  for(i=0;i < n_vals;i++)
		  val[i] = missing_value;

	  *len=n_vals;
	  return GRIB_SUCCESS;
  }

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

  if((err = grib_get_double_array_internal(a->parent->h,self->bitmap,val,&n_vals))
      != GRIB_SUCCESS)
    return err;

  coded_vals = grib_context_malloc(a->parent->h->context,coded_n_vals*sizeof(double));
  if(coded_vals == NULL) return GRIB_OUT_OF_MEMORY;

  if((err = grib_get_double_array_internal(a->parent->h,self->coded_values,coded_vals,&coded_n_vals))
      != GRIB_SUCCESS)
  {
    grib_context_free(a->parent->h->context,coded_vals);
    return err;
  }

  grib_context_log(a->parent->h->context, GRIB_LOG_DEBUG,
      "grib_accessor_data_simple_packing_bitmap : unpack_double : creating %s, %d values",
      a->name, n_vals);

  for(i=0;i < n_vals;i++)
  {
    if(val[i] == 0 ){
      val[i] = missing_value;
    }
    else
    {
      val[i] = coded_vals[j++];
      if(j>coded_n_vals)
      {
        grib_context_free(a->parent->h->context,coded_vals);
        grib_context_log(a->parent->h->context, GRIB_LOG_ERROR,
          "grib_accessor_data_simple_packing_bitmap [%s]:"
          " unpack_double :  number of coded values does not match bitmap %ld %ld",
          a->name,coded_n_vals,n_vals);

        return GRIB_ARRAY_TOO_SMALL;
      }
    }
  }

  *len =  n_vals;

  grib_context_free(a->parent->h->context,coded_vals);
  return err;
}

static int  unpack_double_element(grib_accessor* a, size_t idx,double* val)
{
  grib_accessor_data_apply_bitmap* self =  (grib_accessor_data_apply_bitmap*)a;
  int err = 0,i=0;
  size_t cidx=0;
  double missing_value = 0;
  double* bvals=NULL;
  size_t n_vals = grib_value_count(a);

  if(!grib_find_accessor(a->parent->h,self->bitmap))
    return grib_get_double_element_internal(a->parent->h,self->coded_values,idx,val);

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

  if((err = grib_get_double_element_internal(a->parent->h,self->bitmap,idx,val)) != GRIB_SUCCESS)
    return err;

  if (*val == 0) {*val=missing_value;return GRIB_SUCCESS;}

  bvals = grib_context_malloc(a->parent->h->context,n_vals*sizeof(double));
  if(bvals == NULL) return GRIB_OUT_OF_MEMORY;

  if((err = grib_get_double_array_internal(a->parent->h,self->bitmap,bvals,&n_vals)) != GRIB_SUCCESS)
    return err;

  cidx=0;
  for (i=0;i<idx;i++) {cidx+=bvals[i];}

  grib_context_free(a->parent->h->context,bvals);

  return grib_get_double_element_internal(a->parent->h,self->coded_values,cidx,val);

}

static int pack_double(grib_accessor* a, const double* val, size_t *len)
{
  grib_accessor_data_apply_bitmap* self =  (grib_accessor_data_apply_bitmap*)a;
  int err = 0;
  size_t bmaplen = *len;
  long coded_n_vals = 0;
  double* coded_vals = NULL;
  long i = 0;
  long j = 0;
  double missing_value = 0;

  if (*len ==0) return GRIB_NO_VALUES;

  if(!grib_find_accessor(a->parent->h,self->bitmap)){
      err = grib_set_double_array_internal(a->parent->h,self->coded_values,val,*len);
      /*printf("SETTING TOTAL number_of_data_points %s %ld\n",self->number_of_data_points,*len);*/
      if(self->number_of_data_points)
        grib_set_long_internal(a->parent->h,self->number_of_data_points,*len);
      return err;
  }

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

  if((err = grib_set_double_array_internal(a->parent->h,self->bitmap,val,bmaplen)) != GRIB_SUCCESS)
    return err;

  coded_n_vals = *len;

  if(coded_n_vals <  1){
    err = grib_set_double_array_internal(a->parent->h,self->coded_values,NULL,0);
    return err;
  }

  coded_vals = grib_context_malloc_clear(a->parent->h->context,coded_n_vals*sizeof(double));
  if(!coded_vals) return GRIB_OUT_OF_MEMORY;

  for(i=0; i<*len ; i++)
  {
    if(val[i] != missing_value) {
      coded_vals[j++] = val[i];
    } 
  }

  err = grib_set_double_array_internal(a->parent->h,self->coded_values,coded_vals,j);
  if (j==0) {
    if (self->number_of_values)
      err=grib_set_long_internal(a->parent->h,self->number_of_values,0);
    if (self->binary_scale_factor) 
      err=grib_set_long_internal(a->parent->h,self->binary_scale_factor,0);
  }

  grib_context_free(a->parent->h->context,coded_vals);

  return err;
}

static int  get_native_type(grib_accessor* a)
{
/*  grib_accessor_data_apply_bitmap* self =  (grib_accessor_data_apply_bitmap*)a;
    return grib_accessor_get_native_type(grib_find_accessor(a->parent->h,self->coded_values));*/

   return GRIB_TYPE_DOUBLE;
}
