/*
 * (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_gen
   IMPLEMENTS = init
   IMPLEMENTS = unpack_double;unpack_double_element
   IMPLEMENTS = pack_double
   IMPLEMENTS = value_count
   IMPLEMENTS = dump;get_native_type
   MEMBERS=const char*  coded_values
   MEMBERS=const char*  bitmap
   MEMBERS=const char*  missing_value
   MEMBERS=const char*  number_of_data_points
   MEMBERS=const char*  number_of_values
   MEMBERS=const char*  binary_scale_factor
   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_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 dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static int unpack_double_element(grib_accessor*, size_t i, double* val);

typedef struct grib_accessor_data_apply_bitmap
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in data_apply_bitmap */
    const char* coded_values;
    const char* bitmap;
    const char* missing_value;
    const char* number_of_data_points;
    const char* number_of_values;
    const char* binary_scale_factor;
} grib_accessor_data_apply_bitmap;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_data_apply_bitmap = {
    &grib_accessor_class_gen,                /* super                     */
    "data_apply_bitmap",                     /* name                      */
    sizeof(grib_accessor_data_apply_bitmap), /* size                      */
    0,                                       /* inited */
    &init_class,                             /* init_class */
    &init,                                   /* init                      */
    0,                                       /* post_init                      */
    0,                                       /* free mem                       */
    &dump,                                   /* 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           */
    &get_native_type,                        /* 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   */
    &unpack_double_element,                  /* unpack only ith value          */
    0,                                       /* unpack a subarray         */
    0,                                       /* clear          */
    0,                                       /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_data_apply_bitmap = &_grib_accessor_class_data_apply_bitmap;


static void init_class(grib_accessor_class* c)
{
    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->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_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)
{
    int n                                 = 0;
    grib_accessor_data_apply_bitmap* self = (grib_accessor_data_apply_bitmap*)a;

    self->coded_values          = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->bitmap                = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->missing_value         = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->binary_scale_factor   = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->number_of_data_points = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->number_of_values      = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);

    a->length = 0;
}
static void dump(grib_accessor* a, grib_dumper* dumper)
{
    grib_dump_values(dumper, a);
}

static int value_count(grib_accessor* a, long* count)
{
    grib_accessor_data_apply_bitmap* self = (grib_accessor_data_apply_bitmap*)a;
    size_t len                            = 0;
    int ret                               = 0;

    if (grib_find_accessor(grib_handle_of_accessor(a), self->bitmap))
        ret = grib_get_size(grib_handle_of_accessor(a), self->bitmap, &len);
    else
        ret = grib_get_size(grib_handle_of_accessor(a), self->coded_values, &len);

    *count = len;

    return ret;
}

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

    size_t i             = 0;
    size_t j             = 0;
    size_t n_vals        = 0;
    long nn              = 0;
    int err              = 0;
    size_t coded_n_vals  = 0;
    double* coded_vals   = NULL;
    double missing_value = 0;

    err    = grib_value_count(a, &nn);
    n_vals = nn;
    if (err)
        return err;

    if (!grib_find_accessor(grib_handle_of_accessor(a), self->bitmap))
        return grib_get_double_array(grib_handle_of_accessor(a), self->coded_values, val, len);

    if ((err = grib_get_size(grib_handle_of_accessor(a), self->coded_values, &coded_n_vals)) != GRIB_SUCCESS)
        return err;

    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;
    }

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

        *len = n_vals;
        return GRIB_SUCCESS;
    }

    if ((err = grib_get_double_array_internal(grib_handle_of_accessor(a), self->bitmap, val, &n_vals)) != GRIB_SUCCESS)
        return err;

    coded_vals = (double*)grib_context_malloc(a->context, coded_n_vals * sizeof(double));
    if (coded_vals == NULL)
        return GRIB_OUT_OF_MEMORY;

    if ((err = grib_get_double_array(grib_handle_of_accessor(a), self->coded_values, coded_vals, &coded_n_vals)) != GRIB_SUCCESS) {
        grib_context_free(a->context, coded_vals);
        return err;
    }

    grib_context_log(a->context, GRIB_LOG_DEBUG,
                     "grib_accessor_class_data_apply_bitmap: unpack_double : creating %s, %d values",
                     a->name, n_vals);

    for (i = 0; i < n_vals; i++) {
        if (val[i] == 0) {
            val[i] = missing_value;
        }
        else {
            val[i] = coded_vals[j++];
            if (j > coded_n_vals) {
                grib_context_free(a->context, coded_vals);
                grib_context_log(a->context, GRIB_LOG_ERROR,
                                 "grib_accessor_class_data_apply_bitmap [%s]:"
                                 " unpack_double :  number of coded values does not match bitmap %ld %ld",
                                 a->name, coded_n_vals, n_vals);

                return GRIB_ARRAY_TOO_SMALL;
            }
        }
    }

    *len = n_vals;

    grib_context_free(a->context, coded_vals);
    return err;
}

static int unpack_double_element(grib_accessor* a, size_t idx, double* val)
{
    grib_accessor_data_apply_bitmap* self = (grib_accessor_data_apply_bitmap*)a;
    int err = 0, i = 0;
    size_t cidx          = 0;
    double missing_value = 0;
    double* bvals        = NULL;
    size_t n_vals        = 0;
    long nn              = 0;

    err    = grib_value_count(a, &nn);
    n_vals = nn;
    if (err)
        return err;

    if (!grib_find_accessor(grib_handle_of_accessor(a), self->bitmap))
        return grib_get_double_element_internal(grib_handle_of_accessor(a), self->coded_values, idx, val);

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

    if ((err = grib_get_double_element_internal(grib_handle_of_accessor(a), self->bitmap, idx, val)) != GRIB_SUCCESS)
        return err;

    if (*val == 0) {
        *val = missing_value;
        return GRIB_SUCCESS;
    }

    bvals = (double*)grib_context_malloc(a->context, n_vals * sizeof(double));
    if (bvals == NULL)
        return GRIB_OUT_OF_MEMORY;

    if ((err = grib_get_double_array_internal(grib_handle_of_accessor(a), self->bitmap, bvals, &n_vals)) != GRIB_SUCCESS)
        return err;

    cidx = 0;
    for (i = 0; i < idx; i++) {
        cidx += bvals[i];
    }

    grib_context_free(a->context, bvals);

    return grib_get_double_element_internal(grib_handle_of_accessor(a), self->coded_values, cidx, val);
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_data_apply_bitmap* self = (grib_accessor_data_apply_bitmap*)a;
    int err                               = 0;
    size_t bmaplen                        = *len;
    long coded_n_vals                     = 0;
    double* coded_vals                    = NULL;
    long i                                = 0;
    long j                                = 0;
    double missing_value                  = 0;
    grib_handle* hand = grib_handle_of_accessor(a);
    grib_context* ctxt = a->context;

    if (*len == 0)
        return GRIB_NO_VALUES;

    if (!grib_find_accessor(hand, self->bitmap)) {
        /*printf("SETTING TOTAL number_of_data_points %s %ld\n",self->number_of_data_points,*len);*/
        if (self->number_of_data_points)
            grib_set_long_internal(hand, self->number_of_data_points, *len);

        err = grib_set_double_array_internal(hand, self->coded_values, val, *len);
        return err;
    }

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

    if ((err = grib_set_double_array_internal(hand, self->bitmap, val, bmaplen)) != GRIB_SUCCESS)
        return err;

    coded_n_vals = *len;

    if (coded_n_vals < 1) {
        err = grib_set_double_array_internal(hand, self->coded_values, NULL, 0);
        return err;
    }

    coded_vals = (double*)grib_context_malloc_clear(ctxt, coded_n_vals * sizeof(double));
    if (!coded_vals)
        return GRIB_OUT_OF_MEMORY;

    for (i = 0; i < *len; i++) {
        if (val[i] != missing_value) {
            coded_vals[j++] = val[i];
        }
    }

    err = grib_set_double_array_internal(hand, self->coded_values, coded_vals, j);
    grib_context_free(ctxt, coded_vals);
    if (j == 0) {
        if (self->number_of_values)
            err = grib_set_long_internal(hand, self->number_of_values, 0);
        if (self->binary_scale_factor)
            err = grib_set_long_internal(hand, self->binary_scale_factor, 0);
    }

    return err;
}

static int get_native_type(grib_accessor* a)
{
    /*  grib_accessor_data_apply_bitmap* self =  (grib_accessor_data_apply_bitmap*)a;
    return grib_accessor_get_native_type(grib_find_accessor(grib_handle_of_accessor(a),self->coded_values));*/

    return GRIB_TYPE_DOUBLE;
}
