/*
 * (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_double
   IMPLEMENTS = unpack_double;pack_double
   IMPLEMENTS = init
   IMPLEMENTS = next_offset
   IMPLEMENTS = byte_count
   IMPLEMENTS = value_count
   IMPLEMENTS = byte_offset
   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 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 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_ibmfloat
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in ibmfloat */
    grib_arguments* arg;
} grib_accessor_ibmfloat;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_ibmfloat = {
    &grib_accessor_class_double,    /* super                     */
    "ibmfloat",                     /* name                      */
    sizeof(grib_accessor_ibmfloat), /* size                      */
    0,                              /* inited */
    &init_class,                    /* init_class */
    &init,                          /* init                      */
    0,                              /* post_init                      */
    0,                              /* free mem                       */
    0,                              /* 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      */
    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_ibmfloat = &_grib_accessor_class_ibmfloat;


static void init_class(grib_accessor_class* c)
{
    c->dump                   = (*(c->super))->dump;
    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_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_ibmfloat* self = (grib_accessor_ibmfloat*)a;
    long count                   = 0;

    self->arg = arg;
    grib_value_count(a, &count);
    a->length = 4 * count;
    Assert(a->length >= 0);
}

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

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

    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++)
        val[i] = grib_long_to_ibm(grib_decode_unsigned_long(grib_handle_of_accessor(a)->buffer->data, &bitp, 32));

    *len = rlen;
    return GRIB_SUCCESS;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_ibmfloat* self = (grib_accessor_ibmfloat*)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 pack at least 1 values ", a->name, rlen);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    if (rlen == 1) {
        /*
    double x = 0;
    grib_nearest_smaller_ibm_float(val[0],&x);
    double y = grib_long_to_ibm(grib_ibm_to_long(val[0]));
    printf("IBMFLOAT val=%.20f nearest_smaller_ibm_float=%.20f long_to_ibm=%.20f\n",val[0],x ,y);
         */
        off = byte_offset(a) * 8;
        ret = grib_encode_unsigned_long(grib_handle_of_accessor(a)->buffer->data, grib_ibm_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_ibm_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);

    a->length = byte_count(a);

    return ret;
}

static long byte_count(grib_accessor* a)
{
    return a->length;
}

static int value_count(grib_accessor* a, long* len)
{
    grib_accessor_ibmfloat* self = (grib_accessor_ibmfloat*)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 long byte_offset(grib_accessor* a)
{
    return a->offset;
}
static void update_size(grib_accessor* a, size_t s)
{
    a->length = s;
    Assert(a->length >= 0);
}
static long next_offset(grib_accessor* a)
{
    return grib_byte_offset(a) + grib_byte_count(a);
}

static int nearest_smaller_value(grib_accessor* a, double val, double* nearest)
{
    int ret = 0;
    if (grib_nearest_smaller_ibm_float(val, nearest) == GRIB_INTERNAL_ERROR) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "grib_nearest_smaller_ibm_float overflow value=%g\n", val);
        grib_dump_content(grib_handle_of_accessor(a), stderr, "wmo", GRIB_DUMP_FLAG_HEXADECIMAL, 0);
        ret = GRIB_INTERNAL_ERROR;
    }
    return ret;
}
