/*
 * (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
   MEMBERS = const char* values
   MEMBERS = const char* missingValue
   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 void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_offset_values
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in offset_values */
    const char* values;
    const char* missingValue;
} grib_accessor_offset_values;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_offset_values = {
    &grib_accessor_class_double,         /* super                     */
    "offset_values",                     /* name                      */
    sizeof(grib_accessor_offset_values), /* 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      */
    0,                                   /* 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   */
    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_offset_values = &_grib_accessor_class_offset_values;


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->value_count            = (*(c->super))->value_count;
    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->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* args)
{
    int n                             = 0;
    grib_accessor_offset_values* self = (grib_accessor_offset_values*)a;
    self->values                      = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->missingValue                = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    a->flags |= GRIB_ACCESSOR_FLAG_FUNCTION;
    a->length = 0;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    int ret = 0;
    *val    = 0;
    *len    = 1;
    return ret;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    double* values            = NULL;
    size_t size               = 0;
    double missingValue       = 0;
    long missingValuesPresent = 0;
    int ret = 0, i = 0;
    grib_accessor_offset_values* self = (grib_accessor_offset_values*)a;
    grib_context* c                   = a->context;
    grib_handle* h                    = grib_handle_of_accessor(a);

    if (*val == 0)
        return GRIB_SUCCESS;

    if ((ret = grib_get_double_internal(h, self->missingValue, &missingValue)) != GRIB_SUCCESS) {
        return ret;
    }
    if ((ret = grib_get_long_internal(h, "missingValuesPresent", &missingValuesPresent)) != GRIB_SUCCESS) {
        return ret;
    }

    if ((ret = grib_get_size(h, self->values, &size)) != GRIB_SUCCESS)
        return ret;

    values = (double*)grib_context_malloc(c, size * sizeof(double));
    if (!values)
        return GRIB_OUT_OF_MEMORY;

    if ((ret = grib_get_double_array_internal(h, self->values, values, &size)) != GRIB_SUCCESS) {
        grib_context_free(c, values);
        return ret;
    }

    for (i = 0; i < size; i++) {
        if (missingValuesPresent) {
            if (values[i] != missingValue)
                values[i] += *val;
        }
        else {
            values[i] += *val;
        }
    }

    if ((ret = grib_set_double_array_internal(h, self->values, values, size)) != GRIB_SUCCESS)
        return ret;

    grib_context_free(c, values);

    return GRIB_SUCCESS;
}
