/*
 * (C) Copyright 2005- 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.
 */
/*****************************
 *  Enrico Fucile
 ****************************/

#include "grib_api_internal.h"
#define PRECISION_32_IEEE 1
#define PRECISION_64_IEEE 2
#define PRECISION_128_IEEE 3

#define COMPRESSION_NONE 0
#define COMPRESSION_LZW 1

#define PRE_PROCESSING_NONE 0
#define PRE_PROCESSING_DIFFERENCE 1
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = init
   IMPLEMENTS = unpack_long
   IMPLEMENTS = get_native_type
   MEMBERS=const char*   values
   MEMBERS=const char*   precision
   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_long(grib_accessor*, long* val, size_t* len);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_number_of_values_data_raw_packing
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in number_of_values_data_raw_packing */
    const char* values;
    const char* precision;
} grib_accessor_number_of_values_data_raw_packing;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_number_of_values_data_raw_packing = {
    &grib_accessor_class_gen,                                /* super                     */
    "number_of_values_data_raw_packing",                     /* name                      */
    sizeof(grib_accessor_number_of_values_data_raw_packing), /* 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           */
    &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      */
    &unpack_long,                                            /* 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   */
    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_number_of_values_data_raw_packing = &_grib_accessor_class_number_of_values_data_raw_packing;


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->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->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->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)
{
    int n                                                 = 0;
    grib_accessor_number_of_values_data_raw_packing* self = (grib_accessor_number_of_values_data_raw_packing*)a;

    self->values    = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->precision = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
    a->length = 0;
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    int err                                               = 0;
    grib_accessor_number_of_values_data_raw_packing* self = (grib_accessor_number_of_values_data_raw_packing*)a;
    grib_accessor* adata                                  = NULL;
    long precision                                        = 0;
    int bytes                                             = 0;
    long byte_count                                       = 0;

    adata = grib_find_accessor(grib_handle_of_accessor(a), self->values);
    Assert(adata != NULL);
    byte_count = grib_byte_count(adata);

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

    switch (precision) {
        case 1:
            bytes = 4;
            break;

        case 2:
            bytes = 8;
            break;

        default:
            return GRIB_NOT_IMPLEMENTED;
            break;
    }

    *val = byte_count / bytes;

    return err;
}

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