/*
 * (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_abstract_long_vector
   IMPLEMENTS = init
   IMPLEMENTS = unpack_long;pack_long
   IMPLEMENTS = unpack_double;get_native_type
   MEMBERS = const char* vector
   MEMBERS = int index
   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 get_native_type(grib_accessor*);
static int pack_long(grib_accessor*, const long* val, size_t* len);
static int unpack_double(grib_accessor*, double* val, size_t* len);
static int unpack_long(grib_accessor*, long* val, size_t* len);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_long_vector
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in abstract_long_vector */
    long* v;
    long pack_index;
    int number_of_elements;
    /* Members defined in long_vector */
    const char* vector;
    int index;
} grib_accessor_long_vector;

extern grib_accessor_class* grib_accessor_class_abstract_long_vector;

static grib_accessor_class _grib_accessor_class_long_vector = {
    &grib_accessor_class_abstract_long_vector, /* super                     */
    "long_vector",                             /* name                      */
    sizeof(grib_accessor_long_vector),         /* 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           */
    &get_native_type,                          /* get native type               */
    0,                                         /* get sub_section                */
    0,                                         /* grib_pack procedures long      */
    0,                                         /* grib_pack procedures long      */
    &pack_long,                                /* 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_long_vector = &_grib_accessor_class_long_vector;


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->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->is_missing             = (*(c->super))->is_missing;
    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 */

typedef struct grib_accessor_abstract_long_vector
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in abstract_long_vector */
    long* v;
    long pack_index;
    int number_of_elements;
} grib_accessor_abstract_long_vector;

static void init(grib_accessor* a, const long l, grib_arguments* c)
{
    grib_accessor_long_vector* self       = (grib_accessor_long_vector*)a;
    grib_accessor* va                     = NULL;
    grib_accessor_abstract_long_vector* v = NULL;
    int n                                 = 0;

    self->vector = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    va = (grib_accessor*)grib_find_accessor(grib_handle_of_accessor(a), self->vector);
    v  = (grib_accessor_abstract_long_vector*)va;

    self->index = grib_arguments_get_long(grib_handle_of_accessor(a), c, n++);

    /* check self->index on init and never change it */
    Assert(self->index < v->number_of_elements && self->index >= 0);

    a->length = 0;
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    size_t size = 0;
    int err = 0;
    long* vector;
    grib_accessor_long_vector* self       = (grib_accessor_long_vector*)a;
    grib_accessor* va                     = NULL;
    grib_accessor_abstract_long_vector* v = NULL;

    va = (grib_accessor*)grib_find_accessor(grib_handle_of_accessor(a), self->vector);
    v  = (grib_accessor_abstract_long_vector*)va;

    /*TODO implement the dirty mechanism to avoid to unpack every time */
    err = grib_get_size(grib_handle_of_accessor(a), self->vector, &size);
    if (err) return err;
    DebugAssert(size > 0);
    vector = (long*)grib_context_malloc(a->context, sizeof(long) * size);
    err = grib_unpack_long(va, vector, &size);
    grib_context_free(a->context, vector);
    if (err) return err;

    *val = v->v[self->index];

    return GRIB_SUCCESS;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    long lval                             = 0;
    int err                               = 0;
    grib_accessor_long_vector* self       = (grib_accessor_long_vector*)a;
    grib_accessor* va                     = NULL;
    grib_accessor_abstract_long_vector* v = NULL;
    va                                    = (grib_accessor*)grib_find_accessor(grib_handle_of_accessor(a), self->vector);
    v                                     = (grib_accessor_abstract_long_vector*)va;

    err = unpack_long(a, &lval, len);

    *val = (double)v->v[self->index];

    return err;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    int err                               = 0;
    grib_accessor_long_vector* self       = (grib_accessor_long_vector*)a;
    grib_accessor* va                     = NULL;
    grib_accessor_abstract_long_vector* v = NULL;

    va = (grib_accessor*)grib_find_accessor(grib_handle_of_accessor(a), self->vector);
    v  = (grib_accessor_abstract_long_vector*)va;

    v->pack_index = self->index;

    err = grib_pack_long(va, val, len);

    return err;
}

static int get_native_type(grib_accessor* a)
{
    return GRIB_TYPE_LONG;
}
