/*
 * 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.
 */

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

#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_unsigned
   IMPLEMENTS = init;dump
   IMPLEMENTS = value_count
   MEMBERS    = const char* tablename
   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 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_codeflag {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in long */
/* Members defined in unsigned */
	long nbytes;
	grib_arguments* arg;
/* Members defined in codeflag */
	const char* tablename;
} grib_accessor_codeflag;

extern grib_accessor_class* grib_accessor_class_unsigned;

static grib_accessor_class _grib_accessor_class_codeflag = {
    &grib_accessor_class_unsigned,                      /* super                     */
    "codeflag",                      /* name                      */
    sizeof(grib_accessor_codeflag),  /* 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      */
    0,                  /* grib_pack procedures long      */
    0,                /* 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_codeflag = &_grib_accessor_class_codeflag;


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_long	=	(*(c->super))->pack_long;
	c->unpack_long	=	(*(c->super))->unpack_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 void init  (grib_accessor* a,const long len, grib_arguments* param)
{
    grib_accessor_codeflag* self = (grib_accessor_codeflag*)a;
    a->length = len;
    self->tablename = grib_arguments_get_string(a->parent->h,param,0);
    Assert(a->length>=0);
}

static int test_bit(long a, long b)
{
    return a&(1<<b);
}

static int grib_get_codeflag(grib_accessor* a, long code, char* codename)
{
    grib_accessor_codeflag* self = (grib_accessor_codeflag*)a;
    FILE* f = NULL;
    char fname[1024];
    char bval[50];
    char num[50];
    char* filename=0;
    char line[1024];
    size_t i =0;
    int j =0;

    grib_recompose_name(a->parent->h,NULL, self->tablename, fname,1);

    if ((filename=grib_context_full_defs_path(a->parent->h->context,fname))==NULL) {
        grib_context_log(a->parent->h->context,GRIB_LOG_WARNING,"Cannot open flag table %s",filename);
        strcpy(codename, "Cannot open flag table");
        return GRIB_FILE_NOT_FOUND;
    }

    f=fopen(filename, "r");

    if (!f)
    {
        grib_context_log(a->parent->h->context,(GRIB_LOG_WARNING)|(GRIB_LOG_PERROR),"Cannot open flag table %s",filename);
        strcpy(codename, "Cannot open flag table");
        return GRIB_FILE_NOT_FOUND;
    }

#if 0
    strcpy(codename, self->tablename);
    strcat(codename,": ");
    j = strlen(codename);
#endif

    while(fgets(line,sizeof(line)-1,f))
    {
        sscanf(line,"%49s %49s", num, bval);

        if(num[0] != '#')
        {
            if((test_bit(code, a->length*8-atol(num))>0) == atol(bval))
            {
                size_t linelen = strlen(line);
                codename[j++] = '(';
                codename[j++] = num[0];
                codename[j++] = '=';
                codename[j++] = bval[0];
                codename[j++] = ')';
                codename[j++] = ' ';
                if(j)
                    codename[j++] = ' ';

                for(i=(strlen(num)+strlen(bval)+2); i < linelen-1;i++)
                    codename[j++] = line[i];
                if(line[i]!='\n')
                    codename[j++] = line[i];
                codename[j++] = ';';
            }
        }
    }

    if(j>1 && codename[j-1] == ';') j--;
    codename[j] = 0;

    strcat(codename,":");
    strcat(codename,self->tablename);

    fclose(f);
    return GRIB_SUCCESS;
}

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

static void dump(grib_accessor* a, grib_dumper* dumper)
{
    grib_accessor_codeflag* self = (grib_accessor_codeflag*)a;
    long v;
    char flagname[1024];
    char fname[1024];

    size_t llen = 1;

    grib_recompose_name(a->parent->h,NULL, self->tablename, fname,1);
    grib_unpack_long(a, &v, &llen);

    grib_get_codeflag(a, v, flagname);

    grib_dump_bits(dumper,a,flagname);
}
