/*
 * (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 = value_count
   IMPLEMENTS = byte_offset
   IMPLEMENTS = update_size
   MEMBERS    = grib_accessor* unexpandedDescriptorsEncoded
   MEMBERS    = const char* createNewData

   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_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_unexpanded_descriptors
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in unexpanded_descriptors */
    grib_accessor* unexpandedDescriptorsEncoded;
    const char* createNewData;
} grib_accessor_unexpanded_descriptors;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_unexpanded_descriptors = {
    &grib_accessor_class_long,                    /* super                     */
    "unexpanded_descriptors",                     /* name                      */
    sizeof(grib_accessor_unexpanded_descriptors), /* 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      */
    0,                                            /* 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_unexpanded_descriptors = &_grib_accessor_class_unexpanded_descriptors;


static void init_class(grib_accessor_class* c)
{
    c->string_length          = (*(c->super))->string_length;
    c->byte_count             = (*(c->super))->byte_count;
    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 void init(grib_accessor* a, const long len, grib_arguments* args)
{
    grib_accessor_unexpanded_descriptors* self = (grib_accessor_unexpanded_descriptors*)a;
    int n                                      = 0;
    grib_handle* hand                          = grib_handle_of_accessor(a);
    self->unexpandedDescriptorsEncoded         = grib_find_accessor(hand, grib_arguments_get_name(hand, args, n++));
    self->createNewData                        = grib_arguments_get_name(hand, args, n++);
    a->length                                  = 0;
}

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_unexpanded_descriptors* self = (grib_accessor_unexpanded_descriptors*)a;
    int ret                                    = 0;
    long pos                                   = 0;
    long rlen                                  = 0;
    long f, x, y;
    long* v = val;
    long i;
    grib_handle* hand = grib_handle_of_accessor(a);

    pos = accessor_raw_get_offset(self->unexpandedDescriptorsEncoded) * 8;

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

    if (rlen == 0) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         "No descriptors in section 3. Malformed message.");
        return GRIB_MESSAGE_MALFORMED;
    }

    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;
    }

    for (i = 0; i < rlen; i++) {
        f    = grib_decode_unsigned_long(hand->buffer->data, &pos, 2);
        x    = grib_decode_unsigned_long(hand->buffer->data, &pos, 6);
        y    = grib_decode_unsigned_long(hand->buffer->data, &pos, 8);
        *v++ = f * 100000 + x * 1000 + y;
    }
    *len = rlen;
    return GRIB_SUCCESS;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    grib_accessor_unexpanded_descriptors* self = (grib_accessor_unexpanded_descriptors*)a;
    int ret                                    = 0;
    long pos                                   = 0;
    unsigned long f, x, y;
    unsigned char* buf      = NULL;
    grib_accessor* expanded = NULL;
    size_t buflen           = *len * 2;
    size_t i = 0, length = *len;
    long createNewData = 1;
    grib_handle* hand  = grib_handle_of_accessor(a);

    grib_get_long(hand, self->createNewData, &createNewData);

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

    for (i = 0; i < length; i++) {
        const long tmp = val[i] % 100000;
        f              = val[i] / 100000;
        x              = tmp / 1000;
        y              = tmp % 1000;
        grib_encode_unsigned_longb(buf, f, &pos, 2);
        grib_encode_unsigned_longb(buf, x, &pos, 6);
        grib_encode_unsigned_longb(buf, y, &pos, 8);
    }

    grib_pack_bytes(self->unexpandedDescriptorsEncoded, buf, &buflen);
    grib_context_free(hand->context, buf);

    if (createNewData == 0)
        return ret;

    expanded = grib_find_accessor(hand, "expandedCodes");
    Assert(expanded != NULL);
    ret = grib_accessor_class_expanded_descriptors_set_do_expand(expanded, 1);
    if (ret != GRIB_SUCCESS)
        return ret;

    ret = grib_set_long(hand, "unpack", 3); /* BUFR new data */
    if (ret != GRIB_SUCCESS)
        return ret;

    ret = grib_set_long(hand, "unpack", 1); /* Unpack structure */

    return ret;
}

static int value_count(grib_accessor* a, long* numberOfUnexpandedDescriptors)
{
    grib_accessor_unexpanded_descriptors* self = (grib_accessor_unexpanded_descriptors*)a;
    long n                                     = 0;

    grib_value_count(self->unexpandedDescriptorsEncoded, &n);
    *numberOfUnexpandedDescriptors = n / 2;

    return 0;
}

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;
}
