/*
 * (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_long
   IMPLEMENTS = unpack_long;pack_long
   IMPLEMENTS = init;dump
   IMPLEMENTS = next_offset
   IMPLEMENTS = byte_count
   IMPLEMENTS = value_count
   IMPLEMENTS = byte_offset
   IMPLEMENTS = update_size
   MEMBERS    = const char* numberOfBits
   MEMBERS    = const char* numberOfElements

   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_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, long* val, size_t* len);
static long byte_count(grib_accessor*);
static long byte_offset(grib_accessor*);
static long next_offset(grib_accessor*);
static int value_count(grib_accessor*, long*);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static void update_size(grib_accessor*, size_t);

typedef struct grib_accessor_spd
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in spd */
    const char* numberOfBits;
    const char* numberOfElements;
} grib_accessor_spd;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_spd = {
    &grib_accessor_class_long, /* super                     */
    "spd",                     /* name                      */
    sizeof(grib_accessor_spd), /* size                      */
    0,                         /* inited */
    &init_class,               /* init_class */
    &init,                     /* init                      */
    0,                         /* post_init                      */
    0,                         /* free mem                       */
    &dump,                     /* describes himself         */
    &next_offset,              /* get length of section     */
    0,                         /* get length of string      */
    &value_count,              /* get number of values      */
    &byte_count,               /* get number of bytes      */
    &byte_offset,              /* get offset to bytes           */
    0,                         /* get native type               */
    0,                         /* get sub_section                */
    0,                         /* grib_pack procedures long      */
    0,                         /* grib_pack procedures long      */
    &pack_long,                /* 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   */
    &update_size,              /* 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_spd = &_grib_accessor_class_spd;


static void init_class(grib_accessor_class* c)
{
    c->string_length          = (*(c->super))->string_length;
    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_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->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 long byte_count(grib_accessor* a)
{
    return a->length;
}

static long compute_byte_count(grib_accessor* a)
{
    grib_accessor_spd* self = (grib_accessor_spd*)a;
    long numberOfBits;
    long numberOfElements;
    int ret = 0;

    ret = grib_get_long(grib_handle_of_accessor(a), self->numberOfBits, &numberOfBits);
    if (ret) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         "%s unable to get %s to compute size", a->name, self->numberOfBits);
        return 0;
    }

    ret = grib_get_long(grib_handle_of_accessor(a), self->numberOfElements, &numberOfElements);
    if (ret) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         "%s unable to get %s to compute size", a->name, self->numberOfElements);
        return 0;
    }
    numberOfElements++;

    return (numberOfBits * numberOfElements + 7) / 8;
}

static void init(grib_accessor* a, const long len, grib_arguments* args)
{
    grib_accessor_spd* self = (grib_accessor_spd*)a;
    int n                   = 0;
    self->numberOfBits      = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->numberOfElements  = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    a->length               = compute_byte_count(a);
}

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

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    grib_accessor_spd* self = (grib_accessor_spd*)a;
    int i;
    int ret           = 0;
    long pos          = a->offset * 8;
    long rlen         = 0;
    long numberOfBits = 0;

    ret = value_count(a, &rlen);
    if (ret)
        return ret;

    if (*len < rlen) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         " wrong size (%ld) for %s it contains %d values ", *len, a->name, rlen);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    ret = grib_get_long(grib_handle_of_accessor(a), self->numberOfBits, &numberOfBits);
    if (ret)
        return ret;
    if (numberOfBits > 64) {
        grib_context_log(a->context, GRIB_LOG_ERROR,"Invalid number of bits: %ld",numberOfBits);
        return GRIB_DECODING_ERROR;
    }

    for (i = 0; i < rlen - 1; i++)
        val[i] = grib_decode_unsigned_long(grib_handle_of_accessor(a)->buffer->data, &pos, numberOfBits);

    val[rlen - 1] = grib_decode_signed_longb(grib_handle_of_accessor(a)->buffer->data, &pos, numberOfBits);

    *len = rlen;

    return GRIB_SUCCESS;
}

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

    ret = value_count(a, &rlen);
    if (ret)
        return ret;

    if (*len != rlen) {
        ret = grib_set_long(grib_handle_of_accessor(a), self->numberOfElements, (*len) - 1);
        if (ret) return ret;
    }

    ret = grib_get_long(grib_handle_of_accessor(a), self->numberOfBits, &numberOfBits);
    if (ret)
        return ret;

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

    for (i = 0; i < rlen - 1; i++) {
        grib_encode_unsigned_longb(buf, val[i], &off, numberOfBits);
    }

    grib_encode_signed_longb(buf, val[rlen - 1], &off, numberOfBits);

    grib_buffer_replace(a, buf, buflen, 1, 1);

    grib_context_free(a->context, buf);

    *len = rlen;
    return ret;
}

static int value_count(grib_accessor* a, long* numberOfElements)
{
    grib_accessor_spd* self = (grib_accessor_spd*)a;
    int ret;
    *numberOfElements = 0;

    ret = grib_get_long(grib_handle_of_accessor(a), self->numberOfElements, numberOfElements);
    if (ret) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         "%s unable to get %s to compute size", a->name, self->numberOfElements);
        return ret;
    }
    (*numberOfElements)++;

    return ret;
}

static long byte_offset(grib_accessor* a)
{
    return a->offset;
}

static void update_size(grib_accessor* a, size_t s)
{
    a->length = s;
}

static long next_offset(grib_accessor* a)
{
    return byte_offset(a) + a->length;
}
