/*
 * Copyright 2005-2017 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"
#include <ctype.h>

#if GRIB_PTHREADS
static pthread_once_t once  = PTHREAD_ONCE_INIT;
static pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;

static void thread_init() {
    pthread_mutexattr_t attr;
    pthread_mutexattr_init(&attr);
    pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE);
    pthread_mutex_init(&mutex1,&attr);
    pthread_mutexattr_destroy(&attr);
}
#elif GRIB_OMP_THREADS
static int once = 0;
static omp_nest_lock_t mutex1;

static void thread_init()
{
    GRIB_OMP_CRITICAL(lock_grib_accessor_class_bufr_elements_table_c)
    {
        if (once == 0)
        {
            omp_init_nest_lock(&mutex1);
            once = 1;
        }
    }
}
#endif

/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = init;unpack_string;unpack_long;unpack_double
   IMPLEMENTS = value_count; get_native_type;
   MEMBERS    =  const char* dictionary
   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 init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_bufr_elements_table {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in bufr_elements_table */
	const char* dictionary;
	const char* masterDir;
	const char* localDir;
} grib_accessor_bufr_elements_table;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_bufr_elements_table = {
    &grib_accessor_class_gen,                      /* super                     */
    "bufr_elements_table",                      /* name                      */
    sizeof(grib_accessor_bufr_elements_table),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    0,                       /* 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_bufr_elements_table = &_grib_accessor_class_bufr_elements_table;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	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_bufr_elements_table* self  = (grib_accessor_bufr_elements_table*)a;

    self->dictionary = grib_arguments_get_string(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_bufr_elements_table(grib_accessor* a, int* err)
{
    grib_accessor_bufr_elements_table* self = (grib_accessor_bufr_elements_table*)a;

    char* filename=NULL;
    char line[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;
    grib_handle* h=grib_handle_of_accessor(a);
    grib_context* c=a->context;

    *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[1024]={0,};
        char recomposed[1024]={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 localRecomposed[1024]={0,};
        char localName[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,"found def file %s",filename);
    }
    GRIB_MUTEX_INIT_ONCE(&once,&thread_init);
    GRIB_MUTEX_LOCK(&mutex1);

    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);
        goto the_end;
    } 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; dictionary=NULL; goto the_end;}

    dictionary=grib_trie_new(c);

    while(fgets(line,sizeof(line)-1,f)) {
        list=string_split(line, "|");
        grib_trie_insert(dictionary,list[0],list);
    }

    fclose(f);

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

        while(fgets(line,sizeof(line)-1,f)) {
            list=string_split(line, "|");
            grib_trie_insert(dictionary,list[0],list);
        }

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

the_end:
    GRIB_MUTEX_UNLOCK(&mutex1);
    return dictionary;
}

static int convert_type(char* stype)
{
    int ret=BUFR_DESCRIPTOR_TYPE_UNKNOWN;
    switch (stype[0]) {
    case 's':
        if (!strcmp(stype,"string") ) ret=BUFR_DESCRIPTOR_TYPE_STRING;
        break;
    case 'l':
        if (!strcmp(stype,"long") ) ret=BUFR_DESCRIPTOR_TYPE_LONG;
        break;
    case 'd':
        if (!strcmp(stype,"double") ) ret=BUFR_DESCRIPTOR_TYPE_DOUBLE;
        break;
    case 't':
        if (!strcmp(stype,"table") ) ret=BUFR_DESCRIPTOR_TYPE_TABLE;
        break;
    case 'f':
        if (!strcmp(stype,"flag") ) ret=BUFR_DESCRIPTOR_TYPE_FLAG;
        break;
    default:
        ret=BUFR_DESCRIPTOR_TYPE_UNKNOWN;
    }

    return ret;
}

static int bufr_get_from_table(grib_accessor* a,bufr_descriptor* v)
{
    int ret=0;
    char** list=0;
    char code[7]={0};
    grib_context* c;
    char* str=NULL;

    grib_trie* table;

    table=load_bufr_elements_table(a,&ret);
    if (ret) return ret;

    c=a->context;

    sprintf(code,"%06ld",v->code);

    list=(char**)grib_trie_get(table,code);
    if (!list) return GRIB_NOT_FOUND;

    v->shortName=grib_context_strdup(c,list[1]);
    v->type=convert_type(list[2]);
    /* v->name=grib_context_strdup(c,list[3]);  See ECC-489 */
    v->units=grib_context_strdup(c,list[4]);
    str=grib_context_strdup(c,list[5]);
    v->scale=atol(str);
    grib_context_free(c,str);
    v->factor=grib_power(-v->scale,10);
    str=grib_context_strdup(c,list[6]);
    v->reference=atol(str);
    grib_context_free(c,str);
    str=grib_context_strdup(c,list[7]);
    v->width=atol(str);
    grib_context_free(c,str);

    return ret;
}

int bufr_descriptor_is_marker(bufr_descriptor* d)
{
    int isMarker=0;
    switch (d->code) {
    case 223255:
    case 224255:
    case 225255:
    case 232255:
        return 1;
    }
    if (d->F==2 && d->X==5) isMarker=1;
    return isMarker;
}

bufr_descriptor* accessor_bufr_elements_table_get_descriptor(grib_accessor* a,int code,int *err)
{
    grib_context* c;
    bufr_descriptor* v=NULL;

    if (!a) return NULL;

    c=a->context;

    v=(bufr_descriptor*)grib_context_malloc_clear(c,sizeof(bufr_descriptor));
    if (!v) {
        grib_context_log(c,GRIB_LOG_ERROR,
                "grib_bufr_descriptor_new unable to allocate %d bytes\n",sizeof(bufr_descriptor));
        *err=GRIB_OUT_OF_MEMORY;
        return NULL;
    }
    v->context=c;
    v->code=code;
    v->F=code/100000;
    v->X=(code-v->F*100000)/1000;
    v->Y=(code-v->F*100000)%1000;

    switch (v->F) {
    case 0:
        *err=bufr_get_from_table(a,v);
        break;
    case 1:
        v->type=BUFR_DESCRIPTOR_TYPE_REPLICATION;
        break;
    case 2:
        v->type=BUFR_DESCRIPTOR_TYPE_OPERATOR;
        break;
    case 3:
        v->type=BUFR_DESCRIPTOR_TYPE_SEQUENCE;
        break;
    }

    return v;
}

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

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

static int get_native_type(grib_accessor* a)
{
    return GRIB_TYPE_STRING;
}

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

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