/*
 * (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_unsigned
   IMPLEMENTS = unpack_long;pack_long; value_count
   IMPLEMENTS = init
   MEMBERS= const char*      value
   MEMBERS= const char*      factor
   MEMBERS= const char*      divisor
   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_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, long* 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_times
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in unsigned */
    long nbytes;
    grib_arguments* arg;
    /* Members defined in times */
    const char* value;
    const char* factor;
    const char* divisor;
} grib_accessor_times;

extern grib_accessor_class* grib_accessor_class_unsigned;

static grib_accessor_class _grib_accessor_class_times = {
    &grib_accessor_class_unsigned, /* super                     */
    "times",                       /* name                      */
    sizeof(grib_accessor_times),   /* 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      */
    &pack_long,                    /* grib_pack procedures long      */
    &unpack_long,                  /* grib_unpack procedures long    */
    0,                             /* 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_times = &_grib_accessor_class_times;


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_double            = (*(c->super))->pack_double;
    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 l, grib_arguments* c)
{
    grib_accessor_times* self = (grib_accessor_times*)a;
    int n                     = 0;

    self->value   = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    self->factor  = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    self->divisor = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
    a->length     = 0;
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    grib_accessor_times* self = (grib_accessor_times*)a;
    int ret                   = 0;
    long factor               = 0;
    long divisor              = 1;
    int* err                  = &ret;
    long value                = 0;

    if (*len < 1)
        return GRIB_ARRAY_TOO_SMALL;

    if (grib_is_missing(grib_handle_of_accessor(a), self->value, err) != 0) {
        *val = GRIB_MISSING_LONG;
        return GRIB_SUCCESS;
    }
    if (ret)
        return ret;

    ret = grib_get_long_internal(grib_handle_of_accessor(a), self->factor, &factor);
    if (ret)
        return ret;
    if (self->divisor)
        ret = grib_get_long_internal(grib_handle_of_accessor(a), self->divisor, &divisor);
    if (ret)
        return ret;
    ret = grib_get_long_internal(grib_handle_of_accessor(a), self->value, &value);
    if (ret)
        return ret;
    /* printf("factor=%ld divisor=%ld value=%ld\n",factor,divisor,value); */

    *val = ((double)value * (double)factor) / (double)divisor;

    *len = 1;

    return ret;
}


static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    grib_accessor_times* self = (grib_accessor_times*)a;
    int ret                   = 0;
    long value                = 0;
    long factor, v, divisor = 1;

    if (*val == GRIB_MISSING_LONG)
        return grib_set_missing(grib_handle_of_accessor(a), self->value);

    ret = grib_get_long_internal(grib_handle_of_accessor(a), self->factor, &factor);
    if (ret)
        return ret;
    if (self->divisor)
        ret = grib_get_long_internal(grib_handle_of_accessor(a), self->divisor, &divisor);
    if (ret)
        return ret;

    /*Assert((*val%self->factor)==0);*/
    v = *val * divisor;
    if ((v % factor) == 0) {
        value = v / factor;
    }
    else {
        value = v > 0 ? ((double)v) / factor + 0.5 : ((double)v) / factor - 0.5;
        /* grib_context_log(a->context,GRIB_LOG_WARNING,"%s/%ld = %ld/%ld = %ld. Rounding to convert key.",a->name,self->factor,*val,self->factor,value); */
    }

    ret = grib_set_long_internal(grib_handle_of_accessor(a), self->value, value);
    if (ret)
        return ret;

    *len = 1;

    return GRIB_SUCCESS;
}

static int value_count(grib_accessor* a, long* count)
{
    *count = 1;
    return 0;
}
