/*
 * 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.
 */

/************************************
 *  Enrico Fucile
 ***********************************/

#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;unpack_string
   IMPLEMENTS = init;dump;value_count
   MEMBERS=const char* century
   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 pack_long(grib_accessor*, const long* val,size_t *len);
static int unpack_long(grib_accessor*, long* val,size_t *len);
static int unpack_string (grib_accessor*, char*, 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*);

typedef struct grib_accessor_g1date {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in long */
/* Members defined in g1date */
	const char* century;
	const char* year;
	const char* month;
	const char* day;
} grib_accessor_g1date;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_g1date = {
    &grib_accessor_class_long,                      /* super                     */
    "g1date",                      /* name                      */
    sizeof(grib_accessor_g1date),  /* 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           */
    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    */
    &unpack_string,              /* 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_g1date = &_grib_accessor_class_g1date;


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->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->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_g1date* self = (grib_accessor_g1date*)a;
    int n = 0;

    self->century = 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++);
}

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)
{   
    int ret=0;
    grib_accessor_g1date* self = (grib_accessor_g1date*)a;

    long year = 0;
    long century = 0;
    long month = 0;
    long day = 0;

    if ((ret=grib_get_long_internal(a->parent->h, self->century,&century))!=GRIB_SUCCESS)
        return ret;
    if ((ret=grib_get_long_internal(a->parent->h, self->day,&day))!=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->year,&year))!=GRIB_SUCCESS)
        return ret;

    if(*len < 1)
        return GRIB_WRONG_ARRAY_SIZE;

    *val   = ((century-1)*100 + year) * 10000 + month * 100 + day;

    if(year == 255 && day == 255 && month >= 1 && month <= 12)
    {
        *val = month;
    }

    if(year == 255 && day != 255 &&  month >= 1 && month <= 12)
    {
        *val =  month * 100 + day;
    }

    return GRIB_SUCCESS;
}

static int pack_long(grib_accessor* a, const long* val, size_t *len)
{
    int ret=0;
    long v = val[0];
    grib_accessor_g1date* self = (grib_accessor_g1date*)a;

    long year    = 0;
    long century = 0;
    long month   = 0;
    long day     = 0;

    if(*len !=  1)
        return GRIB_WRONG_ARRAY_SIZE;

    {
        long d = grib_julian_to_date((long)grib_date_to_julian(v));
        if(v != d)
        {
            grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,"grib_accessor_g1date: pack_long invalid date %ld, changed to %ld",v,d);
            return GRIB_ENCODING_ERROR;
        }
    }

    century =  v / 1000000; v %= 1000000;
    year    =  v / 10000;   v %= 10000;
    month   =  v / 100;     v %= 100;
    day     =  v;

    if(year == 0)
        year = 100;
    else
        century++;

    if ((ret=grib_set_long_internal(a->parent->h,self->century,century))!=GRIB_SUCCESS)
        return ret;
    if ((ret=grib_set_long_internal(a->parent->h,self->day,day))!=GRIB_SUCCESS)
        return ret;
    if ((ret=grib_set_long_internal(a->parent->h,self->month,month))!=GRIB_SUCCESS)
        return ret;
    if ((ret=grib_set_long_internal(a->parent->h,self->year,year))!=GRIB_SUCCESS)
        return ret;

    return GRIB_SUCCESS;
}

static const char* months[] = {
        "jan","feb","mar","apr",
        "may","jun","jul","aug",
        "sep","oct","nov","dec",
};

static int unpack_string(grib_accessor* a, char* val, size_t *len)
{   
    int ret=0;
    char tmp[1024];
    grib_accessor_g1date* self = (grib_accessor_g1date*)a;
    long year = 0;
    long century = 0;
    long month = 0;
    long day = 0;
    size_t l;

    if ((ret=grib_get_long_internal(a->parent->h, self->century,&century))!=GRIB_SUCCESS)
        return ret;
    if ((ret=grib_get_long_internal(a->parent->h, self->day,&day))!=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->year,&year))!=GRIB_SUCCESS)
        return ret;

    if(*len < 1)
        return GRIB_WRONG_ARRAY_SIZE;

    if(year == 255 && day == 255 && month >= 1 && month <= 12)
    {
        strcpy(tmp,months[month-1]);
    }
    else if(year == 255 && month >= 1 && month <= 12)
    {
        sprintf(tmp,"%s-%02ld",months[month-1],day);
        /* sprintf(tmp,"%02ld-%02ld",month,day); */
    }
    else
    {
        long x = ((century-1)*100 + year) * 10000 + month * 100 + day;
        sprintf(tmp,"%ld",x);
    }

    l = strlen(tmp) + 1;
    if(*len < l)
    {
        *len = l;
        return GRIB_BUFFER_TOO_SMALL;
    }

    *len = l;
    strcpy(val,tmp);

    return GRIB_SUCCESS;
}

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