/*
 * (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.
 */

#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_double
   IMPLEMENTS = unpack_double;pack_double
   IMPLEMENTS = init
   IMPLEMENTS = value_count
   MEMBERS    = grib_arguments* arg
   IMPLEMENTS = update_size
   IMPLEMENTS = nearest_smaller_value
   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*);
static void update_size(grib_accessor*, size_t);
static int nearest_smaller_value(grib_accessor*, double, double*);

typedef struct grib_accessor_ieeefloat
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in ieeefloat */
    grib_arguments* arg;
} grib_accessor_ieeefloat;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_ieeefloat = {
    &grib_accessor_class_double,     /* super                     */
    "ieeefloat",                     /* name                      */
    sizeof(grib_accessor_ieeefloat), /* 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   */
    &update_size,                    /* update_size   */
    0,                               /* preferred_size   */
    0,                               /* resize   */
    &nearest_smaller_value,          /* 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_ieeefloat = &_grib_accessor_class_ieeefloat;


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->preferred_size         = (*(c->super))->preferred_size;
    c->resize                 = (*(c->super))->resize;
    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 len, grib_arguments* arg)
{
    grib_accessor_ieeefloat* self = (grib_accessor_ieeefloat*)a;
    long count                    = 0;
    self->arg                     = arg;
    grib_value_count(a, &count);
    a->length = 4 * count;

    Assert(a->length >= 0);
}

static int value_count(grib_accessor* a, long* len)
{
    grib_accessor_ieeefloat* self = (grib_accessor_ieeefloat*)a;
    *len                          = 0;

    if (!self->arg) {
        *len = 1;
        return 0;
    }
    return grib_get_long_internal(grib_handle_of_accessor(a), grib_arguments_get_name(a->parent->h, self->arg, 0), len);
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_ieeefloat* self = (grib_accessor_ieeefloat*)a;
    int ret                       = 0;
    unsigned long i               = 0;
    unsigned long rlen            = *len;
    size_t buflen                 = 0;
    unsigned char* buf            = NULL;
    long off                      = 0;

    if (*len < 1) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Wrong size for %s, it packs at least 1 value", a->name);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    if (rlen == 1) {
        off = a->offset * 8;
        ret = grib_encode_unsigned_long(grib_handle_of_accessor(a)->buffer->data, grib_ieee_to_long(val[0]), &off, 32);
        if (*len > 1)
            grib_context_log(a->context, GRIB_LOG_WARNING, "grib_accessor_unsigned : Trying to pack %d values in a scalar %s, packing first value", *len, a->name);
        if (ret == GRIB_SUCCESS)
            len[0] = 1;
        return ret;
    }

    buflen = rlen * 4;

    buf = (unsigned char*)grib_context_malloc(a->context, buflen);

    for (i = 0; i < rlen; i++) {
        grib_encode_unsigned_longb(buf, grib_ieee_to_long(val[i]), &off, 32);
    }
    ret = grib_set_long_internal(grib_handle_of_accessor(a), grib_arguments_get_name(a->parent->h, self->arg, 0), rlen);

    if (ret == GRIB_SUCCESS)
        grib_buffer_replace(a, buf, buflen, 1, 1);
    else
        *len = 0;

    grib_context_free(a->context, buf);

    return ret;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    long rlen       = 0;
    int err         = 0;
    unsigned long i = 0;
    long bitp       = a->offset * 8;

    err = grib_value_count(a, &rlen);
    if (err)
        return err;

    if (*len < rlen) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Wrong size (%lu) for %s, it contains %ld values", *len, a->name, rlen);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }
    for (i = 0; i < rlen; i++)
        val[i] = grib_long_to_ieee(grib_decode_unsigned_long(grib_handle_of_accessor(a)->buffer->data, &bitp, 32));

    *len = rlen;
    return GRIB_SUCCESS;
}
static void update_size(grib_accessor* a, size_t s)
{
    a->length = s;
    Assert(a->length >= 0);
}

static int nearest_smaller_value(grib_accessor* a, double val, double* nearest)
{
    return grib_nearest_smaller_ieee_float(val, nearest);
}
