/*
 * 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_gen
   IMPLEMENTS = unpack_double;pack_double
   IMPLEMENTS = unpack_string;pack_string;string_length
   IMPLEMENTS = unpack_long;pack_long;destroy
   IMPLEMENTS = init;dump;value_count;get_native_type
   IMPLEMENTS = compare
   MEMBERS = char* key
   MEMBERS = grib_hash_array_value* ha
    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  get_native_type(grib_accessor*);
static int pack_double(grib_accessor*, const double* val,size_t *len);
static int pack_long(grib_accessor*, const long* val,size_t *len);
static int pack_string(grib_accessor*, const char*, size_t *len);
static int unpack_double(grib_accessor*, double* 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 size_t string_length(grib_accessor*);
static int value_count(grib_accessor*,long*);
static void destroy(grib_context*,grib_accessor*);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);
static int compare(grib_accessor*, grib_accessor*);

typedef struct grib_accessor_hash_array {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in hash_array */
	char* key;
	grib_hash_array_value* ha;
} grib_accessor_hash_array;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_hash_array = {
    &grib_accessor_class_gen,                      /* super                     */
    "hash_array",                      /* name                      */
    sizeof(grib_accessor_hash_array),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    &destroy,                    /* free mem                       */
    &dump,                       /* describes himself         */
    0,                /* get length of section     */
    &string_length,              /* get length of string      */
    &value_count,                /* get number of values      */
    0,                 /* get number of bytes      */
    0,                /* get offset to bytes           */
    &get_native_type,            /* 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    */
    &pack_double,                /* grib_pack procedures double    */
    &unpack_double,              /* grib_unpack procedures double  */
    &pack_string,                /* grib_pack procedures string    */
    &unpack_string,              /* 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    */
    &compare,                    /* compare vs. another accessor   */
    0,     /* unpack only ith value          */
    0,     /* unpack a subarray         */
    0,              		/* clear          */
    0,               		/* clone accessor          */
};


grib_accessor_class* grib_accessor_class_hash_array = &_grib_accessor_class_hash_array;


static void init_class(grib_accessor_class* c)
{
	c->next_offset	=	(*(c->super))->next_offset;
	c->byte_count	=	(*(c->super))->byte_count;
	c->byte_offset	=	(*(c->super))->byte_offset;
	c->sub_section	=	(*(c->super))->sub_section;
	c->pack_missing	=	(*(c->super))->pack_missing;
	c->is_missing	=	(*(c->super))->is_missing;
	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->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 */

#define MAX_HASH_ARRAY_STRING_LENGTH 255

static void init(grib_accessor* a, const long len , grib_arguments* args )
{
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    a->length = 0;
    self->key=0;
    self->ha=NULL;
}

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

static int pack_double(grib_accessor* a, const double* val, size_t *len)
{
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    char s[200]={0,};
    sprintf(s,"%g",*val);
    self->key=grib_context_strdup(a->context,s);
    self->ha=0;
    return GRIB_SUCCESS;
}

static int pack_long(grib_accessor* a, const long* val, size_t *len)
{
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    char s[200]={0,};
    sprintf(s,"%ld",*val);
    if (self->key) grib_context_free(a->context,self->key);
    self->key=grib_context_strdup(a->context,s);
    self->ha=0;
    return GRIB_SUCCESS;
}

static int pack_string(grib_accessor*a , const char*  v, size_t *len)
{
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    self->key=grib_context_strdup(a->context,v);
    self->ha=0;
    return GRIB_SUCCESS;
}

static int unpack_double(grib_accessor* a, double* val, size_t *len)
{
    return GRIB_NOT_IMPLEMENTED;
}

static grib_hash_array_value* find_hash_value(grib_accessor* a,int *err)
{
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    grib_hash_array_value* ha_ret=0;
    grib_hash_array_value* ha=NULL;

    ha=get_hash_array(grib_handle_of_accessor(a),a->creator);
    if (!ha) {
        grib_context_log(a->context,GRIB_LOG_ERROR,
                "unable to get hash value for %s", a->creator->name);
        *err=GRIB_HASH_ARRAY_NO_MATCH;
        return NULL;
    }

    *err=GRIB_SUCCESS;

    Assert(ha!=NULL);
    if (!self->key) {
        grib_context_log(a->context,GRIB_LOG_ERROR,
                "unable to get hash value for %s, set before getting",a->creator->name);
        *err=GRIB_HASH_ARRAY_NO_MATCH;
        return NULL;
    }

    ha_ret=(grib_hash_array_value*)grib_trie_get(ha->index,self->key);
    if (!ha_ret) ha_ret=(grib_hash_array_value*)grib_trie_get(ha->index,"default");

    if (!ha_ret)  {
        *err=GRIB_HASH_ARRAY_NO_MATCH;
        grib_context_log(a->context,GRIB_LOG_ERROR,
                "hash_array: no match for %s=%s",
                a->creator->name,self->key);
        return NULL;
    }
    return ha_ret;
}

static int unpack_long(grib_accessor* a, long* val, size_t *len)
{
    grib_hash_array_value* ha=0;
    grib_accessor_hash_array* self=(grib_accessor_hash_array*)a;
    int err=0;
    int i;

    if (!self->ha) {
        ha=find_hash_value(a,&err);
        if (err) return err;
        self->ha=ha;
    }

    switch (self->ha->type) {
    case GRIB_HASH_ARRAY_TYPE_INTEGER:
        if (*len<self->ha->iarray->n) {
            return GRIB_ARRAY_TOO_SMALL;
        }
        *len=self->ha->iarray->n;
        for (i=0;i<*len;i++)
            val[i]=self->ha->iarray->v[i];
        break;

    default:
        return GRIB_NOT_IMPLEMENTED;
    }

    return GRIB_SUCCESS;
}

static int get_native_type(grib_accessor* a)
{
    int type=GRIB_TYPE_STRING;
    if (a->flags & GRIB_ACCESSOR_FLAG_LONG_TYPE)
        type=GRIB_TYPE_LONG;

    return type;
}

static void destroy(grib_context* c,grib_accessor* a)
{
    grib_accessor_hash_array *self = (grib_accessor_hash_array*)a;
    if (self->key) grib_context_free(c,self->key);
}

static int unpack_string (grib_accessor* a, char* val, size_t *len)
{
    return GRIB_NOT_IMPLEMENTED;
}

static size_t string_length(grib_accessor* a)
{
    return MAX_HASH_ARRAY_STRING_LENGTH;
}

static int value_count(grib_accessor* a,long* count)
{
    int err=0;
    grib_accessor_hash_array *self = (grib_accessor_hash_array*)a;
    grib_hash_array_value* ha=0;

    if (!self->ha) {
        ha=find_hash_value(a,&err);
        if (err) return err;
        self->ha=ha;
    }

    *count=self->ha->iarray->n;
    return err;
}

static int compare(grib_accessor* a,grib_accessor* b)
{
    return GRIB_NOT_IMPLEMENTED;
}
