/*
 * (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;
   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 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_latlonvalues
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in latlonvalues */
    const char* values;
} grib_accessor_latlonvalues;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_latlonvalues = {
    &grib_accessor_class_double,        /* super                     */
    "latlonvalues",                     /* name                      */
    sizeof(grib_accessor_latlonvalues), /* 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      */
    0,                                  /* 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_latlonvalues = &_grib_accessor_class_latlonvalues;


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->unpack_long            = (*(c->super))->unpack_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_latlonvalues* self = (grib_accessor_latlonvalues*)a;
    int n                            = 0;

    self->values = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);

    a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    grib_context* c = a->context;
    int ret         = 0;
    double* v       = val;
    double lat, lon, value;
    size_t size         = 0;
    long count          = 0;
    grib_iterator* iter = grib_iterator_new(grib_handle_of_accessor(a), 0, &ret);
    if (ret != GRIB_SUCCESS) {
        if (iter)
            grib_iterator_delete(iter);
        grib_context_log(c, GRIB_LOG_ERROR, "unable to create iterator");
        return ret;
    }

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

    if (*len < size) {
        if (iter)
            grib_iterator_delete(iter);
        return GRIB_ARRAY_TOO_SMALL;
    }

    while (grib_iterator_next(iter, &lat, &lon, &value)) {
        *(v++) = lat;
        *(v++) = lon;
        *(v++) = value;
    }

    grib_iterator_delete(iter);

    *len = size;

    return GRIB_SUCCESS;
}

static int value_count(grib_accessor* a, long* count)
{
    grib_accessor_latlonvalues* self = (grib_accessor_latlonvalues*)a;
    grib_handle* h                   = grib_handle_of_accessor(a);
    int ret = GRIB_SUCCESS;
    size_t size;
    if ((ret = grib_get_size(h, self->values, &size)) != GRIB_SUCCESS) {
        grib_context_log(h->context, GRIB_LOG_ERROR, "unable to get size of %s", self->values);
        return ret;
    }

    *count = 3 * size;
    return GRIB_SUCCESS;
}
