/*
 * (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_bitmap
   IMPLEMENTS = pack_double
   IMPLEMENTS = value_count
   IMPLEMENTS = init;
   MEMBERS=const char* numberOfValues
   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 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_g2bitmap
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in bytes */
    /* Members defined in bitmap */
    const char* tableReference;
    const char* missing_value;
    const char* offsetbsec;
    const char* sLength;
    /* Members defined in g2bitmap */
    const char* numberOfValues;
} grib_accessor_g2bitmap;

extern grib_accessor_class* grib_accessor_class_bitmap;

static grib_accessor_class _grib_accessor_class_g2bitmap = {
    &grib_accessor_class_bitmap,    /* super                     */
    "g2bitmap",                     /* name                      */
    sizeof(grib_accessor_g2bitmap), /* 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    */
    0,                              /* 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_g2bitmap = &_grib_accessor_class_g2bitmap;


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->unpack_double          = (*(c->super))->unpack_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 len, grib_arguments* arg)
{
    grib_accessor_g2bitmap* self = (grib_accessor_g2bitmap*)a;

    self->numberOfValues = grib_arguments_get_name(grib_handle_of_accessor(a), arg, 4);
}


static void grib_set_bit_on(unsigned char* p, long* bitp)
{
    unsigned char o = 1;
    p += (*bitp >> 3);
    o <<= 7 - ((*bitp) % 8);
    *p |= o;
    (*bitp) += 1;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_g2bitmap* self = (grib_accessor_g2bitmap*)a;

    size_t tlen;

    unsigned char* buf = NULL;
    size_t i;
    int err            = 0;
    long pos           = 0;
    long bmaplen       = 0;
    double miss_values = 0;
    tlen               = (*len + 7) / 8;

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

    buf = (unsigned char*)grib_context_malloc_clear(a->context, tlen);
    if (!buf)
        return GRIB_OUT_OF_MEMORY;
    pos = 0;
    for (i = 0; i < *len; i++) {
        if (val[i] == miss_values)
            pos++;
        else {
            bmaplen++;
            grib_set_bit_on(buf, &pos);
        }
    }

    if ((err = grib_set_long_internal(grib_handle_of_accessor(a), self->numberOfValues, *len)) != GRIB_SUCCESS) {
        grib_context_free(a->context, buf);
        return err;
    }

    grib_buffer_replace(a, buf, tlen, 1, 1);

    grib_context_free(a->context, buf);

    return GRIB_SUCCESS;
}


static int value_count(grib_accessor* a, long* tlen)
{
    grib_accessor_g2bitmap* self = (grib_accessor_g2bitmap*)a;
    int err;
    *tlen = 0;

    err = grib_get_long_internal(grib_handle_of_accessor(a), self->numberOfValues, tlen);
    return err;
}
