/*
 * (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.
 */

#include "grib_api_internal.h"

/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = init;dump;unpack_string;unpack_long;unpack_double
   IMPLEMENTS = value_count; get_native_type;
   MEMBERS    =  const char* dictionary
   MEMBERS    =  const char* key
   MEMBERS    =  long column
   MEMBERS    =  const char* masterDir
   MEMBERS    =  const char* localDir
   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 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 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_dictionary
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in dictionary */
    const char* dictionary;
    const char* key;
    long column;
    const char* masterDir;
    const char* localDir;
} grib_accessor_dictionary;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_dictionary = {
    &grib_accessor_class_gen,         /* super                     */
    "dictionary",                     /* name                      */
    sizeof(grib_accessor_dictionary), /* 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           */
    &get_native_type,                 /* get native type               */
    0,                                /* get sub_section                */
    0,                                /* grib_pack procedures long      */
    0,                                /* grib_pack procedures long      */
    0,                                /* grib_pack procedures long      */
    &unpack_long,                     /* grib_unpack procedures long    */
    0,                                /* grib_pack procedures double    */
    &unpack_double,                   /* grib_unpack procedures double  */
    0,                                /* 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    */
    0,                                /* compare vs. another accessor   */
    0,                                /* unpack only ith value          */
    0,                                /* unpack a subarray         */
    0,                                /* clear          */
    0,                                /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_dictionary = &_grib_accessor_class_dictionary;


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->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->pack_double            = (*(c->super))->pack_double;
    c->pack_string            = (*(c->super))->pack_string;
    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->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;
    c->make_clone             = (*(c->super))->make_clone;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a, const long len, grib_arguments* params)
{
    int n                          = 0;
    grib_accessor_dictionary* self = (grib_accessor_dictionary*)a;

    self->dictionary = grib_arguments_get_string(grib_handle_of_accessor(a), params, n++);
    self->key        = grib_arguments_get_name(grib_handle_of_accessor(a), params, n++);
    self->column     = grib_arguments_get_long(grib_handle_of_accessor(a), params, n++);
    self->masterDir  = grib_arguments_get_name(grib_handle_of_accessor(a), params, n++);
    self->localDir   = grib_arguments_get_name(grib_handle_of_accessor(a), params, n++);

    a->length = 0;
    a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
}

static grib_trie* load_dictionary(grib_context* c, grib_accessor* a, int* err)
{
    grib_accessor_dictionary* self = (grib_accessor_dictionary*)a;

    char* filename  = NULL;
    char line[1024] = {0,};
    char key[1024] = {0,};
    char masterDir[1024] = {0,};
    char localDir[1024] = {0,};
    char dictName[1024] = {0,};
    char* localFilename   = 0;
    char* list            = 0;
    size_t len            = 1024;
    grib_trie* dictionary = NULL;
    FILE* f               = NULL;
    int i                 = 0;
    grib_handle* h        = grib_handle_of_accessor(a);

    *err = GRIB_SUCCESS;

    len = 1024;
    if (self->masterDir != NULL)
        grib_get_string(h, self->masterDir, masterDir, &len);
    len = 1024;
    if (self->localDir != NULL)
        grib_get_string(h, self->localDir, localDir, &len);

    if (*masterDir != 0) {
        char name[2048] = {0,};
        char recomposed[2048] = {0,};
        sprintf(name, "%s/%s", masterDir, self->dictionary);
        grib_recompose_name(h, NULL, name, recomposed, 0);
        filename = grib_context_full_defs_path(c, recomposed);
    }
    else {
        filename = grib_context_full_defs_path(c, self->dictionary);
    }

    if (*localDir != 0) {
        char localName[2048] = {0,};
        char localRecomposed[1024] = {0,};
        sprintf(localName, "%s/%s", localDir, self->dictionary);
        grib_recompose_name(h, NULL, localName, localRecomposed, 0);
        localFilename = grib_context_full_defs_path(c, localRecomposed);
        sprintf(dictName, "%s:%s", localFilename, filename);
    }
    else {
        sprintf(dictName, "%s", filename);
    }

    if (!filename) {
        grib_context_log(c, GRIB_LOG_ERROR, "unable to find def file %s", self->dictionary);
        *err = GRIB_FILE_NOT_FOUND;
        return NULL;
    }
    else {
        grib_context_log(c, GRIB_LOG_DEBUG, "dictionary: found def file %s", filename);
    }
    dictionary = (grib_trie*)grib_trie_get(c->lists, dictName);
    if (dictionary) {
        grib_context_log(c, GRIB_LOG_DEBUG, "using dictionary %s from cache", self->dictionary);
        return dictionary;
    }
    else {
        grib_context_log(c, GRIB_LOG_DEBUG, "using dictionary %s from file %s", self->dictionary, filename);
    }

    f = codes_fopen(filename, "r");
    if (!f) {
        *err = GRIB_IO_PROBLEM;
        return NULL;
    }

    dictionary = grib_trie_new(c);

    while (fgets(line, sizeof(line) - 1, f)) {
        i = 0;
        while (line[i] != '|' && line[i] != 0) {
            key[i] = line[i];
            i++;
        }
        key[i] = 0;
        list   = (char*)grib_context_malloc_clear(c, strlen(line) + 1);
        memcpy(list, line, strlen(line));
        grib_trie_insert(dictionary, key, list);
    }

    fclose(f);

    if (localFilename != 0) {
        f = codes_fopen(localFilename, "r");
        if (!f) {
            *err = GRIB_IO_PROBLEM;
            return NULL;
        }

        while (fgets(line, sizeof(line) - 1, f)) {
            i = 0;
            while (line[i] != '|' && line[i] != 0) {
                key[i] = line[i];
                i++;
            }
            key[i] = 0;
            list   = (char*)grib_context_malloc_clear(c, strlen(line) + 1);
            memcpy(list, line, strlen(line));
            grib_trie_insert(dictionary, key, list);
        }


        fclose(f);
    }
    grib_trie_insert(c->lists, filename, dictionary);
    return dictionary;
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
    switch (get_native_type(a)) {
        case GRIB_TYPE_STRING:
            grib_dump_string(dumper, a, NULL);
            break;
        case GRIB_TYPE_LONG:
            grib_dump_long(dumper, a, NULL);
            break;
        case GRIB_TYPE_DOUBLE:
            grib_dump_double(dumper, a, NULL);
            break;
    }
}

static int unpack_string(grib_accessor* a, char* buffer, size_t* len)
{
    grib_accessor_dictionary* self = (grib_accessor_dictionary*)a;
    int err                        = GRIB_SUCCESS;
    char key[1024]                 = {0,};
    size_t size  = 1024;
    char* list   = NULL;
    char* start  = NULL;
    char* end    = NULL;
    size_t rsize = 0;
    int i        = 0;

    grib_trie* dictionary = load_dictionary(a->context, a, &err);
    if (err)
        return err;

    if ((err = grib_get_string_internal(grib_handle_of_accessor(a), self->key, key, &size)) != GRIB_SUCCESS) {
        /* grib_trie_delete(dictionary); */
        return err;
    }

    list = (char*)grib_trie_get(dictionary, key);
    if (!list) {
        /* grib_trie_delete(dictionary); */
        return GRIB_NOT_FOUND;
    }

    end = list;
    for (i = 0; i <= self->column; i++) {
        start = end;
        while (*end != '|' && *end != 0)
            end++;
        if (!*end) {
            break;
        }
        end++;
    }
    end--;
    rsize = end - start;
    if (*len < rsize) {
        /* grib_trie_delete(dictionary); */
        return GRIB_ARRAY_TOO_SMALL;
    }

    *len = rsize;
    if (buffer && start)
        memcpy(buffer, start, rsize);
    if (buffer)
        buffer[rsize] = 0;

    /* grib_trie_delete(dictionary); */

    return err;
}

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

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

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    int err           = 0;
    char buffer[1024] = {0,};
    size_t size = 1024;

    err = unpack_string(a, buffer, &size);
    if (err)
        return err;

    *val = atol(buffer);
    *len = 1;

    return GRIB_SUCCESS;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    int err           = 0;
    char buffer[1024] = {0,};
    size_t size = 1024;

    err = unpack_string(a, buffer, &size);
    if (err)
        return err;

    *val = atof(buffer);
    *len = 1;

    return GRIB_SUCCESS;
}
