/*
 * (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 = is_missing;pack_missing
   IMPLEMENTS = init
   MEMBERS=const char*                  grid
   MEMBERS=int                          index
   MEMBERS=const char*                  given
   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_missing(grib_accessor*);
static int is_missing(grib_accessor*);
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_g2latlon
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in double */
    /* Members defined in g2latlon */
    const char* grid;
    int index;
    const char* given;
} grib_accessor_g2latlon;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_g2latlon = {
    &grib_accessor_class_double,    /* super                     */
    "g2latlon",                     /* name                      */
    sizeof(grib_accessor_g2latlon), /* 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                */
    &pack_missing,                  /* grib_pack procedures long      */
    &is_missing,                    /* 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_g2latlon = &_grib_accessor_class_g2latlon;


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_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* c)
{
    grib_accessor_g2latlon* self = (grib_accessor_g2latlon*)a;
    int n                        = 0;

    self->grid  = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    self->index = grib_arguments_get_long(grib_handle_of_accessor(a), c, n++);
    self->given = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    grib_accessor_g2latlon* self = (grib_accessor_g2latlon*)a;
    int ret                      = 0;

    long given = 1;
    double grid[6];
    size_t size = 6;

    if (*len < 1) {
        ret = GRIB_ARRAY_TOO_SMALL;
        return ret;
    }

    if (self->given)
        if ((ret = grib_get_long_internal(grib_handle_of_accessor(a), self->given, &given)) != GRIB_SUCCESS)
            return ret;

    if (!given) {
        *val = GRIB_MISSING_DOUBLE;
        return GRIB_SUCCESS;
    }

    if ((ret = grib_get_double_array_internal(grib_handle_of_accessor(a), self->grid, grid, &size)) != GRIB_SUCCESS)
        return ret;

    *val = grid[self->index];

    return GRIB_SUCCESS;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_g2latlon* self = (grib_accessor_g2latlon*)a;
    int ret                      = 0;
    double grid[6];
    size_t size    = 6;
    double new_val = *val;
    grib_handle* hand = grib_handle_of_accessor(a);

    if (*len < 1) {
        ret = GRIB_ARRAY_TOO_SMALL;
        return ret;
    }

    if (self->given) {
        long given = *val != GRIB_MISSING_DOUBLE;
        if ((ret = grib_set_long_internal(hand, self->given, given)) != GRIB_SUCCESS)
            return ret;
    }

    if ((ret = grib_get_double_array_internal(hand, self->grid, grid, &size)) != GRIB_SUCCESS)
        return ret;

    /* index 1 is longitudeOfFirstGridPointInDegrees
     * index 3 is longitudeOfLastGridPointInDegrees
     */
    if ((self->index == 1 || self->index == 3)) {
        /* WMO regulation for GRIB edition 2:
         * The longitude values shall be limited to the range 0 to 360 degrees inclusive */
        new_val = normalise_longitude_in_degrees(*val);
        if (hand->context->debug && new_val != *val) {
            fprintf(stderr, "ECCODES DEBUG pack_double g2latlon: normalise longitude %g -> %g\n", *val, new_val);
        }
    }
    grid[self->index] = new_val;

    return grib_set_double_array_internal(hand, self->grid, grid, size);
}

static int pack_missing(grib_accessor* a)
{
    grib_accessor_g2latlon* self = (grib_accessor_g2latlon*)a;
    double missing               = GRIB_MISSING_DOUBLE;
    size_t size                  = 1;

    if (!self->given)
        return GRIB_NOT_IMPLEMENTED;

    return pack_double(a, &missing, &size);
}

static int is_missing(grib_accessor* a)
{
    grib_accessor_g2latlon* self = (grib_accessor_g2latlon*)a;
    long given                   = 1;

    if (self->given)
        grib_get_long_internal(grib_handle_of_accessor(a), self->given, &given);

    return !given;
}
