/*
 * 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_data_g1simple_packing
   IMPLEMENTS = init
   IMPLEMENTS = unpack_double 
   IMPLEMENTS = value_count 
   IMPLEMENTS = pack_double
   MEMBERS=const char*  missing_value
   MEMBERS=const char*  numberOfPoints
   MEMBERS=const char*  bitmap
   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 int unpack_double(grib_accessor*, double* val,size_t *len);
static int value_count(grib_accessor*,long*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_data_dummy_field {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in values */
	int  carg;
	const char* seclen;
	const char* offsetdata;
	const char* offsetsection;
	int dirty;
/* Members defined in data_simple_packing */
	int edition;
	const char*  units_factor;
	const char*  units_bias;
	const char*  changing_precision;
	const char*  number_of_values;
	const char*  bits_per_value;
	const char*  reference_value;
	const char*  binary_scale_factor;
	const char*  decimal_scale_factor;
	const char*  optimize_scaling_factor;
/* Members defined in data_g1simple_packing */
	const char*  half_byte;
	const char*  packingType;
	const char*  ieee_packing;
	const char*  precision;
/* Members defined in data_dummy_field */
	const char*  missing_value;
	const char*  numberOfPoints;
	const char*  bitmap;
} grib_accessor_data_dummy_field;

extern grib_accessor_class* grib_accessor_class_data_g1simple_packing;

static grib_accessor_class _grib_accessor_class_data_dummy_field = {
    &grib_accessor_class_data_g1simple_packing,                      /* super                     */
    "data_dummy_field",                      /* name                      */
    sizeof(grib_accessor_data_dummy_field),  /* 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      */
    &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    */
    &unpack_double,              /* 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_data_dummy_field = &_grib_accessor_class_data_dummy_field;


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->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_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)
{
    grib_accessor_data_dummy_field* self =  (grib_accessor_data_dummy_field*)a;
    self->missing_value = grib_arguments_get_name(grib_handle_of_accessor(a),args,self->carg++);
    self->numberOfPoints = grib_arguments_get_name(grib_handle_of_accessor(a),args,self->carg++);
    self->bitmap = grib_arguments_get_name(grib_handle_of_accessor(a),args,self->carg++);
}

static int  unpack_double(grib_accessor* a, double* val, size_t *len)
{
    grib_accessor_data_dummy_field* self =  (grib_accessor_data_dummy_field*)a;
    size_t i = 0;
    size_t n_vals = 0;
    long numberOfPoints;
    double missing_value = 0;
    int err = 0;

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

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

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

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

    if(grib_find_accessor(grib_handle_of_accessor(a),self->bitmap)) {
        if((err = grib_set_double_array_internal(grib_handle_of_accessor(a),self->bitmap,val,n_vals)) != GRIB_SUCCESS)
            return err;
    }

    *len = (long) n_vals;
    return err;
}

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


    size_t n_vals = *len;
    int err = 0;

    long   bits_per_value = 0;

    long   half_byte = 0;

    size_t buflen = 0;
    unsigned char*  buf = NULL;

    if (*len ==0) return GRIB_NO_VALUES;

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

    buflen = (1+((bits_per_value*n_vals)/8))*sizeof(unsigned char);

    buf = (unsigned char*)grib_context_malloc_clear(a->context,buflen);
    if (!buf) return GRIB_OUT_OF_MEMORY;

    half_byte = (buflen*8)-((*len)*bits_per_value);

    if((err = grib_set_long_internal(grib_handle_of_accessor(a),self->half_byte, half_byte)) != GRIB_SUCCESS){
        grib_context_free(a->context,buf);
        return err;
    }
    grib_buffer_replace(a, buf, buflen,1,1);

    grib_context_free(a->context,buf);

    return GRIB_SUCCESS;

}

static int value_count(grib_accessor* a,long* numberOfPoints)
{
    grib_accessor_data_dummy_field* self =  (grib_accessor_data_dummy_field*)a;
    int err=0;
    *numberOfPoints = 0;

    if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->numberOfPoints, numberOfPoints))
            != GRIB_SUCCESS) {
        grib_context_log(a->context,GRIB_LOG_ERROR,"unable to get count of %s (%s)",a->name,grib_get_error_message(err));
    }

    return err;
}
