/*
 * (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"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_padding
   IMPLEMENTS = init;preferred_size;dump
   MEMBERS=grib_expression* expression
   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 void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static size_t preferred_size(grib_accessor*, int);

typedef struct grib_accessor_padto
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in bytes */
    /* Members defined in padding */
    /* Members defined in padto */
    grib_expression* expression;
} grib_accessor_padto;

extern grib_accessor_class* grib_accessor_class_padding;

static grib_accessor_class _grib_accessor_class_padto = {
    &grib_accessor_class_padding, /* super                     */
    "padto",                      /* name                      */
    sizeof(grib_accessor_padto),  /* size                      */
    0,                            /* inited */
    &init_class,                  /* init_class */
    &init,                        /* init                      */
    0,                            /* post_init                      */
    0,                            /* free mem                       */
    &dump,                        /* 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           */
    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    */
    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   */
    &preferred_size,              /* 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_padto = &_grib_accessor_class_padto;


static void init_class(grib_accessor_class* c)
{
    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->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_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->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 size_t preferred_size(grib_accessor* a, int from_handle)
{
    grib_accessor_padto* self = (grib_accessor_padto*)a;

    long length = 0;
    long theEnd;

    grib_expression_evaluate_long(grib_handle_of_accessor(a), self->expression, &theEnd);

    length = theEnd - a->offset;

    /* printf("preferred_size: prefered: %ld current:%ld %s %s %ld\n", (long)length,(long)a->length,a->cclass->name,a->name,(long)a->offset); */

    return length > 0 ? length : 0;
}


static void init(grib_accessor* a, const long len, grib_arguments* arg)
{
    grib_accessor_padto* self = (grib_accessor_padto*)a;

    self->expression = grib_arguments_get_expression(grib_handle_of_accessor(a), arg, 0);
    a->length        = preferred_size(a, 1);
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
    /*grib_dump_string(dumper,a,NULL);*/
}
