/*
 * Copyright 2005-2016 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_long
  IMPLEMENTS = unpack_long;pack_long
  IMPLEMENTS = init;dump
  MEMBERS = const char* codedStep
  MEMBERS = const char* codedUnits
  MEMBERS = const char* stepUnits
  MEMBERS = const char* indicatorOfUnitForTimeRange
  MEMBERS = const char* lengthOfTimeRange

  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 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_step_in_units {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in long */
/* Members defined in step_in_units */
	const char* codedStep;
	const char* codedUnits;
	const char* stepUnits;
	const char* indicatorOfUnitForTimeRange;
	const char* lengthOfTimeRange;
} grib_accessor_step_in_units;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_step_in_units = {
    &grib_accessor_class_long,                      /* super                     */
    "step_in_units",                      /* name                      */
    sizeof(grib_accessor_step_in_units),  /* 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      */
    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      */
    &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 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_step_in_units = &_grib_accessor_class_step_in_units;


static void init_class(grib_accessor_class* c)
{
	c->next_offset	=	(*(c->super))->next_offset;
	c->string_length	=	(*(c->super))->string_length;
	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_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 void init(grib_accessor* a,const long l, grib_arguments* c)
{
	grib_accessor_step_in_units* self = (grib_accessor_step_in_units*)a;
	int n = 0;

	self->codedStep = grib_arguments_get_name(a->parent->h,c,n++);
	self->codedUnits  = grib_arguments_get_name(a->parent->h,c,n++);
	self->stepUnits  = grib_arguments_get_name(a->parent->h,c,n++);
	self->indicatorOfUnitForTimeRange  = grib_arguments_get_name(a->parent->h,c,n++);
	self->lengthOfTimeRange  = grib_arguments_get_name(a->parent->h,c,n++);
}

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

}

/* Conversion of to seconds - Grib edition 2 table 4.4 */
static int u2s2[] =  {
  60,      /* (0)  minutes   */
  3600,    /* (1)  hour      */
  86400,   /* (2)  day       */
  2592000, /* (3)  month     */
  -1,      /* (4)  year      */
  -1,      /* (5)  decade    */
  -1,      /* (6)  30 years  */
  -1,      /* (7)  century   */
  -1,      /* (8)  RESERVED  */
  -1,      /* (9)  RESERVED  */
  10800,   /* (10) 3 hours   */
  21600,   /* (11) 6 hours   */
  43200,   /* (12) 12 hours  */
  1        /* (13) seconds   */
};

/* Note: 'stepUnits' has a different table with extra entries e.g. 15 and 30 mins */
static int u2s[] =  {
  60,      /* (0)  minutes    */
  3600,    /* (1)  hour       */
  86400,   /* (2)  day        */
  2592000, /* (3)  month      */
  -1,      /* (4)  year       */
  -1,      /* (5)  decade     */
  -1,      /* (6)  30 years   */
  -1,      /* (7)  century    */
  -1,      /* (8)             */
  -1,      /* (9)             */
  10800,   /* (10) 3 hours    */
  21600,   /* (11) 6 hours    */
  43200,   /* (12) 12 hours   */
  1,       /* (13) seconds    */
  900,     /* (14) 15 minutes */
  1800     /* (15) 30 minutes */
};

static int unpack_long(grib_accessor* a, long* val, size_t *len)
{
	grib_accessor_step_in_units* self = (grib_accessor_step_in_units*)a;
	int err = 0;
	long codedStep,codedUnits,stepUnits;
	grib_handle* h=a->parent->h;
	int factor=0;
	long u2sf,u2sf_step_unit;


	if((err = grib_get_long_internal(h,self->codedUnits,&codedUnits))) return err;
	if((err = grib_get_long_internal(h,self->stepUnits,&stepUnits))) return err;
	if((err = grib_get_long_internal(h,self->codedStep,&codedStep))) return err;

	if (stepUnits!=codedUnits) {
		*val=codedStep*u2s2[codedUnits];
		if (*val<0) {
			factor=60;
			if (u2s2[codedUnits] % factor) return GRIB_DECODING_ERROR;
			if (u2s[stepUnits] % factor) return GRIB_DECODING_ERROR;
			u2sf=u2s2[codedUnits]/factor;
			*val=codedStep*u2sf;
			u2sf_step_unit=u2s[stepUnits]/factor;
		} else {
			u2sf_step_unit=u2s[stepUnits];
		}

		if (*val % u2sf_step_unit!=0) {
			err = grib_set_long_internal(h,self->stepUnits,codedUnits);
			*val=codedStep;
			return err;
		}
		*val = *val / u2sf_step_unit;
	} else *val=codedStep;

	return GRIB_SUCCESS;
}

static int pack_long(grib_accessor* a, const long* val, size_t *len)
{
	grib_accessor_step_in_units* self = (grib_accessor_step_in_units*)a;
	grib_handle* h=a->parent->h;
	int err = 0;
	long codedStep,codedUnits,stepUnits;
	long oldStep=0;
	long indicatorOfUnitForTimeRange,lengthOfTimeRange;

	if((err = grib_get_long_internal(h,self->codedUnits,&codedUnits))) return err;
	if((err = grib_get_long_internal(h,self->stepUnits,&stepUnits))) return err;

	unpack_long(a,&oldStep,len);

	if (stepUnits!=codedUnits) {
		codedStep=*val * u2s[stepUnits];
		if (codedStep%u2s2[codedUnits]!=0) {
			codedUnits=stepUnits;
			err = grib_set_long_internal(h,self->codedUnits,codedUnits);
			if (err!=GRIB_SUCCESS) return err;
			codedStep=*val;
		}
		else {
			codedStep = codedStep / u2s2[codedUnits];
		}
	}
	else {
		codedStep = *val;
	}

	if (self->indicatorOfUnitForTimeRange) {
		if((err = grib_get_long_internal(h,
				self->indicatorOfUnitForTimeRange,&indicatorOfUnitForTimeRange))) return err;
		if((err = grib_get_long_internal(h,
				self->lengthOfTimeRange,&lengthOfTimeRange))) return err;
		if (codedUnits == indicatorOfUnitForTimeRange )
			lengthOfTimeRange-=codedStep-oldStep;
		else lengthOfTimeRange-=codedStep * u2s2[codedUnits]/u2s2[indicatorOfUnitForTimeRange];
		lengthOfTimeRange = lengthOfTimeRange > 0 ? lengthOfTimeRange : 0 ;
		err = grib_set_long_internal(a->parent->h,self->lengthOfTimeRange,lengthOfTimeRange);
		if (err!=GRIB_SUCCESS) return err;
	}

	return grib_set_long_internal(a->parent->h,self->codedStep,codedStep);
}
