/*
 * (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_long
   IMPLEMENTS = unpack_double
   IMPLEMENTS = value_count
   IMPLEMENTS = init
   MEMBERS=const char*    values
   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 unpack_double(grib_accessor*, double* val, size_t* len);
static int unpack_long(grib_accessor*, long* 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*);

typedef struct grib_accessor_sum
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in sum */
    const char* values;
} grib_accessor_sum;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_sum = {
    &grib_accessor_class_double, /* super                     */
    "sum",                       /* name                      */
    sizeof(grib_accessor_sum),   /* 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      */
    &unpack_long,                /* grib_unpack procedures long    */
    0,                           /* 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   */
    0,                           /* 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_sum = &_grib_accessor_class_sum;


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->pack_double            = (*(c->super))->pack_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->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 l, grib_arguments* c)
{
    grib_accessor_sum* self = (grib_accessor_sum*)a;
    int n                   = 0;
    self->values            = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    a->length               = 0;
    a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    grib_accessor_sum* self = (grib_accessor_sum*)a;
    int ret                 = 0;
    size_t size             = 0;
    long* values            = 0;
    long i;
    long count = 0;

    ret = value_count(a, &count);
    if (ret)
        return ret;
    size = count;

    if (size == 0) {
        *val = 0;
        return GRIB_SUCCESS;
    }
    values = (long*)grib_context_malloc_clear(a->context, sizeof(long) * size);
    if (!values)
        return GRIB_OUT_OF_MEMORY;

    grib_get_long_array(grib_handle_of_accessor(a), self->values, values, &size);

    *val = 0;
    for (i = 0; i < size; i++)
        *val += values[i];

    grib_context_free(a->context, values);

    return GRIB_SUCCESS;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    grib_accessor_sum* self = (grib_accessor_sum*)a;
    int ret                 = 0;
    size_t size             = 0;
    double* values          = 0;
    long i;
    long count = 0;

    ret = value_count(a, &count);
    if (ret)
        return ret;
    size = count;

    if (size == 0) {
        *val = 0;
        return GRIB_SUCCESS;
    }
    values = (double*)grib_context_malloc_clear(a->context, sizeof(double) * size);
    if (!values)
        return GRIB_OUT_OF_MEMORY;

    ret = grib_get_double_array(grib_handle_of_accessor(a), self->values, values, &size);
    if (ret) {
        grib_context_free(a->context, values);
        return ret;
    }
    *val = 0;
    for (i = 0; i < size; i++)
        *val += values[i];

    grib_context_free(a->context, values);

    return GRIB_SUCCESS;
}

static int value_count(grib_accessor* a, long* count)
{
    grib_accessor_sum* self = (grib_accessor_sum*)a;
    size_t n                = 0;
    int ret                 = 0;

    ret    = grib_get_size(grib_handle_of_accessor(a), self->values, &n);
    *count = n;

    if (ret)
        grib_context_log(a->context, GRIB_LOG_ERROR,
                         "%s is unable to get size of %s", a->name, self->values);

    return ret;
}
