/*
 * Copyright 2005-2018 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 ret;
}

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