/*
 * (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.
 */

#include "grib_api_internal.h"

/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_data_g1simple_packing
   IMPLEMENTS = init
   IMPLEMENTS = unpack_double 
   IMPLEMENTS = value_count 
   IMPLEMENTS = pack_double
   MEMBERS=const char*  missing_value
   MEMBERS=const char*  numberOfPoints
   MEMBERS=const char*  bitmap
   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 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_data_dummy_field
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in values */
    int carg;
    const char* seclen;
    const char* offsetdata;
    const char* offsetsection;
    int dirty;
    /* Members defined in data_simple_packing */
    int edition;
    const char* units_factor;
    const char* units_bias;
    const char* changing_precision;
    const char* number_of_values;
    const char* bits_per_value;
    const char* reference_value;
    const char* binary_scale_factor;
    const char* decimal_scale_factor;
    const char* optimize_scaling_factor;
    /* Members defined in data_g1simple_packing */
    const char* half_byte;
    const char* packingType;
    const char* ieee_packing;
    const char* precision;
    /* Members defined in data_dummy_field */
    const char* missing_value;
    const char* numberOfPoints;
    const char* bitmap;
} grib_accessor_data_dummy_field;

extern grib_accessor_class* grib_accessor_class_data_g1simple_packing;

static grib_accessor_class _grib_accessor_class_data_dummy_field = {
    &grib_accessor_class_data_g1simple_packing, /* super                     */
    "data_dummy_field",                         /* name                      */
    sizeof(grib_accessor_data_dummy_field),     /* 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    */
    &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_data_dummy_field = &_grib_accessor_class_data_dummy_field;


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_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 v, grib_arguments* args)
{
    grib_accessor_data_dummy_field* self = (grib_accessor_data_dummy_field*)a;
    self->missing_value                  = grib_arguments_get_name(grib_handle_of_accessor(a), args, self->carg++);
    self->numberOfPoints                 = grib_arguments_get_name(grib_handle_of_accessor(a), args, self->carg++);
    self->bitmap                         = grib_arguments_get_name(grib_handle_of_accessor(a), args, self->carg++);
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    grib_accessor_data_dummy_field* self = (grib_accessor_data_dummy_field*)a;
    size_t i                             = 0;
    size_t n_vals                        = 0;
    long numberOfPoints;
    double missing_value = 0;
    int err              = 0;

    if ((err = grib_get_long_internal(grib_handle_of_accessor(a), self->numberOfPoints, &numberOfPoints)) != GRIB_SUCCESS)
        return err;
    n_vals = numberOfPoints;

    if ((err = grib_get_double_internal(grib_handle_of_accessor(a), self->missing_value, &missing_value)) != GRIB_SUCCESS)
        return err;

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

    for (i = 0; i < n_vals; i++)
        val[i] = missing_value;

    if (grib_find_accessor(grib_handle_of_accessor(a), self->bitmap)) {
        if ((err = grib_set_double_array_internal(grib_handle_of_accessor(a), self->bitmap, val, n_vals)) != GRIB_SUCCESS)
            return err;
    }

    *len = (long)n_vals;
    return err;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_data_dummy_field* self = (grib_accessor_data_dummy_field*)a;


    size_t n_vals = *len;
    int err       = 0;

    long bits_per_value = 0;

    long half_byte = 0;

    size_t buflen      = 0;
    unsigned char* buf = NULL;

    if (*len == 0)
        return GRIB_NO_VALUES;

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

    buflen = (1 + ((bits_per_value * n_vals) / 8)) * sizeof(unsigned char);

    buf = (unsigned char*)grib_context_malloc_clear(a->context, buflen);
    if (!buf)
        return GRIB_OUT_OF_MEMORY;

    half_byte = (buflen * 8) - ((*len) * bits_per_value);

    if ((err = grib_set_long_internal(grib_handle_of_accessor(a), self->half_byte, half_byte)) != GRIB_SUCCESS) {
        grib_context_free(a->context, buf);
        return err;
    }
    grib_buffer_replace(a, buf, buflen, 1, 1);

    grib_context_free(a->context, buf);

    return GRIB_SUCCESS;
}

static int value_count(grib_accessor* a, long* numberOfPoints)
{
    grib_accessor_data_dummy_field* self = (grib_accessor_data_dummy_field*)a;
    int err                              = 0;
    *numberOfPoints                      = 0;

    if ((err = grib_get_long_internal(grib_handle_of_accessor(a), self->numberOfPoints, numberOfPoints)) != GRIB_SUCCESS) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "unable to get count of %s (%s)", a->name, grib_get_error_message(err));
    }

    return err;
}
