/**
 * Copyright 2005-2007 ECMWF
 * 
 * Licensed under the GNU Lesser General Public License which
 * incorporates the terms and conditions of version 3 of the GNU
 * General Public License.
 * See LICENSE and gpl-3.0.txt for details.
 */

#include "grib_api_internal.h"
#include <assert.h>

/* 
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_long
   IMPLEMENTS = unpack_long
   IMPLEMENTS = init;dump
   MEMBERS=const char* date
   MEMBERS=const char* time
   MEMBERS=const char* step
   MEMBERS=const char* stepUnits
   MEMBERS=const char* year
   MEMBERS=const char* month
   MEMBERS=const char* day
   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 unpack_long(grib_accessor*, long* val,size_t *len);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_validity_date {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in long */
/* Members defined in validity_date */
	const char* date;
	const char* time;
	const char* step;
	const char* stepUnits;
	const char* year;
	const char* month;
	const char* day;
} grib_accessor_validity_date;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_validity_date = {
    &grib_accessor_class_long,                      /* super                     */
    "validity_date",                      /* name                      */
    sizeof(grib_accessor_validity_date),  /* 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 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      */
    &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 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          */
};


grib_accessor_class* grib_accessor_class_validity_date = &_grib_accessor_class_validity_date;


static void init_class(grib_accessor_class* c)
{
	c->next_offset	=	(*(c->super))->next_offset;
	c->value_count	=	(*(c->super))->value_count;
	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->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_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;
}

/* END_CLASS_IMP */

static double u2h[] =  {
  1 / 60.0,      /* (0) minutes */
  1,    /* (1) hour    */
  24,   /* (2) day     */
  720,   /* (3) month   */
  -1, -1, -1, -1, -1, -1,-1,
  3,   /* (10) 3 hours */
  6,   /* (11) 6 hours */
  12,   /* (12) 12 hours */
  1 /3600.0        /* (13) seconds  */
};

static void init(grib_accessor* a,const long l, grib_arguments* c)
{
	grib_accessor_validity_date* self = (grib_accessor_validity_date*)a;
	int n = 0;

	self->date = grib_arguments_get_name(a->parent->h,c,n++);
	self->time = grib_arguments_get_name(a->parent->h,c,n++);
	self->step = grib_arguments_get_name(a->parent->h,c,n++);
    self->stepUnits = grib_arguments_get_name(a->parent->h,c,n++);
	self->year = grib_arguments_get_name(a->parent->h,c,n++);
	self->month = grib_arguments_get_name(a->parent->h,c,n++);
	self->day = grib_arguments_get_name(a->parent->h,c,n++);

	a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY; 
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
	grib_dump_long(dumper,a,NULL);
}


static int unpack_long(grib_accessor* a, long* val, size_t *len)
{   
	grib_accessor_validity_date* self = (grib_accessor_validity_date*)a;
	int ret=0;
	long date = 0;
	long time = 0;
	long step = 0;
    long stepUnits = 0;

	if (self->year) {
		long year,month,day;
		if ((ret=grib_get_long_internal(a->parent->h, self->year,&year))!=GRIB_SUCCESS) return ret;
		if ((ret=grib_get_long_internal(a->parent->h, self->month,&month))!=GRIB_SUCCESS) return ret;
		if ((ret=grib_get_long_internal(a->parent->h, self->day,&day))!=GRIB_SUCCESS) return ret;
		*val=year*10000+month*100+day;
		return GRIB_SUCCESS;
	}
	if ((ret=grib_get_long_internal(a->parent->h, self->date,&date))!=GRIB_SUCCESS) return ret;
	if ((ret=grib_get_long_internal(a->parent->h, self->time,&time))!=GRIB_SUCCESS) return ret;
	if ((ret=grib_get_long_internal(a->parent->h, self->step,&step))!=GRIB_SUCCESS) return ret;

    if (self->stepUnits) {
      if ((ret=grib_get_long_internal(a->parent->h, self->stepUnits,&stepUnits))!=GRIB_SUCCESS) return ret;
       
      switch (stepUnits) {
        case 0:
          step/=60;
          break;
        case 13:
          step/=3600;
          break;
        default:
          step*=u2h[stepUnits];
      }
    }


	time /= 100;
    
	time += step;

	date = grib_date_to_julian (date);
	while(time>=24) {
		date ++;
		time -= 24;
	}

	/* printf("\n********\n date %d, time %d, step %d, vdate: %d, cdate %d, vd %d\n********\n", date, time, step, vdate, cdate, vd);    */

	if(*len < 1)
		return GRIB_ARRAY_TOO_SMALL;

	*val   = grib_julian_to_date(date);

	/* fprintf(stdout,"\n********\n %d cdate %d vd %d\n********\n", vdate, cdate, step); */
	return GRIB_SUCCESS;
}

