/*
 * (C) Copyright 2005- 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;
}
