/*
 * 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.
 */

#include "grib_api_internal.h"

bufr_keys_iterator* codes_bufr_keys_iterator_new(grib_handle* h, unsigned long filter_flags)
{
    bufr_keys_iterator* ki=NULL;

    if (!h) return NULL;

    if (h->product_kind != PRODUCT_BUFR) {
        grib_context_log(h->context, GRIB_LOG_ERROR,
                         "Invalid keys iterator for message: please use codes_keys_iterator_new");
        return NULL;
    }
    
    ki= (bufr_keys_iterator*)grib_context_malloc_clear(h->context,sizeof(bufr_keys_iterator));
    if (!ki) return NULL;

    ki->filter_flags = filter_flags;
    ki->handle       = h;
    Assert(h->product_kind == PRODUCT_BUFR);
    ki->names        = NULL;
    ki->i_curr_attribute=0;
    ki->accessor_flags_only= GRIB_ACCESSOR_FLAG_DUMP;
    ki->accessor_flags_skip= GRIB_ACCESSOR_FLAG_HIDDEN | GRIB_ACCESSOR_FLAG_READ_ONLY;

    ki->at_start     = 1;
    ki->match        = 0;

    if (ki->seen==NULL ) ki->seen = grib_trie_new(h->context);

    return ki;
}

bufr_keys_iterator* codes_bufr_data_section_keys_iterator_new(grib_handle* h)
{
    bufr_keys_iterator* ki=NULL;

    if (!h) return NULL;

    ki= (bufr_keys_iterator*)grib_context_malloc_clear(h->context,sizeof(bufr_keys_iterator));
    if (!ki) return NULL;

    ki->handle       = h;
    Assert(h->product_kind == PRODUCT_BUFR);
    ki->i_curr_attribute=0;
    ki->accessor_flags_only= GRIB_ACCESSOR_FLAG_BUFR_DATA | GRIB_ACCESSOR_FLAG_DUMP;
    ki->accessor_flags_skip= GRIB_ACCESSOR_FLAG_HIDDEN | GRIB_ACCESSOR_FLAG_READ_ONLY;

    ki->at_start     = 1;
    ki->match        = 0;

    if(ki->seen==NULL ) ki->seen = grib_trie_new(h->context);

    return ki;
}

static void mark_seen(bufr_keys_iterator* ki,const char* name)
{
    int* r=(int*)grib_trie_get(ki->seen,name);

    if (r) (*r)++;
    else {
        r=(int*)grib_context_malloc(ki->handle->context,sizeof(int));
        *r=1;
        grib_trie_insert(ki->seen,name,(void*)r);
    }
}

int codes_bufr_keys_iterator_rewind(bufr_keys_iterator* ki)
{
    ki->at_start = 1;
    return GRIB_SUCCESS;
}

static int skip(bufr_keys_iterator* kiter)
{
    if(kiter->current->sub_section)
        return 1;

    if(kiter->current->flags & kiter->accessor_flags_skip)
        return 1;

    if(kiter->accessor_flags_only == (kiter->current->flags & kiter->accessor_flags_only))  {
        mark_seen(kiter,kiter->current->name);
        return 0;
    } else  {
        return 1;
    }

    mark_seen(kiter,kiter->current->name);

    return 0;
}

static int next_attribute(bufr_keys_iterator* kiter)
{
    int *r=0;
    int i_curr_attribute;
    if (!kiter->current) return 0;
    if (!kiter->attributes) {
        kiter->attributes=kiter->current->attributes;
        kiter->prefix=0;
        kiter->i_curr_attribute=0;
    }
    i_curr_attribute=kiter->i_curr_attribute-1;

    while (kiter->i_curr_attribute < MAX_ACCESSOR_ATTRIBUTES && kiter->attributes[kiter->i_curr_attribute] ) {
        if ((kiter->attributes[kiter->i_curr_attribute]->flags & GRIB_ACCESSOR_FLAG_DUMP) != 0
                && (kiter->attributes[kiter->i_curr_attribute]->flags & GRIB_ACCESSOR_FLAG_READ_ONLY) ==0) break;
        kiter->i_curr_attribute++;
    }

    if (kiter->attributes[kiter->i_curr_attribute]) {
        if (!kiter->prefix) {
            kiter->prefix=(char*)grib_context_malloc_clear(kiter->current->context,strlen(kiter->current->name)+10);
            r=(int*)grib_trie_get(kiter->seen,kiter->current->name);
            sprintf(kiter->prefix,"#%d#%s",*r,kiter->current->name);
        }
        kiter->i_curr_attribute++;
        return 1;
    } else {
        char* prefix=0;
        if (!kiter->prefix) return 0;
        if (!kiter->attributes[i_curr_attribute]) {
            kiter->prefix=0;
            return 0;
        }
        prefix=(char*)grib_context_malloc_clear(kiter->current->context,strlen(kiter->prefix)+strlen(kiter->attributes[i_curr_attribute]->name)+3);
        sprintf(prefix,"%s->%s",kiter->prefix,kiter->attributes[i_curr_attribute]->name);
        grib_context_free(kiter->current->context,kiter->prefix);
        kiter->prefix=prefix;
        kiter->attributes=kiter->attributes[i_curr_attribute]->attributes;
        kiter->i_curr_attribute=0;
        return next_attribute(kiter);
    }
}

int codes_bufr_keys_iterator_next(bufr_keys_iterator* kiter)
{
    if(kiter->at_start)
    {
        kiter->current  = kiter->handle->root->block->first;
        kiter->at_start = 0;
        kiter->i_curr_attribute=0;
        kiter->prefix=0;
        kiter->attributes=0;
    }
    else
    {
        if (next_attribute(kiter)) {
            return 1;
        } else {
            kiter->current = grib_next_accessor(kiter->current);
            kiter->attributes=0;
            if (kiter->prefix) {
                grib_context_free(kiter->current->context,kiter->prefix);
                kiter->prefix=0;
            }
            kiter->i_curr_attribute=0;
        }
    }

    while(kiter->current && skip(kiter))
        kiter->current = grib_next_accessor(kiter->current);

    return kiter->current != NULL;
}

/* The return value is constructed so we allocate memory for it. */
/* We free in codes_bufr_keys_iterator_delete() */
char* codes_bufr_keys_iterator_get_name(bufr_keys_iterator* kiter)
{
    int *r=0;
    char* ret=0;
    grib_context* c = kiter->handle->context;
    grib_string_list* sl = NULL;
    Assert(kiter->current);

    if (kiter->prefix) {
        int iattribute=kiter->i_curr_attribute-1;
        ret=(char*)grib_context_malloc_clear(kiter->handle->context,strlen(kiter->prefix)+strlen(kiter->attributes[iattribute]->name)+10);
        sprintf(ret,"%s->%s",kiter->prefix,kiter->attributes[iattribute]->name);
    } else {
        ret=(char*)grib_context_malloc_clear(kiter->handle->context,strlen(kiter->current->name)+10);

        if (kiter->current->flags & GRIB_ACCESSOR_FLAG_BUFR_DATA) {
            r=(int*)grib_trie_get(kiter->seen,kiter->current->name);
            sprintf(ret,"#%d#%s",*r,kiter->current->name);
        } else {
            sprintf(ret,"%s",kiter->current->name);
        }
    }

    /* Store in list of names to be deleted later */
    sl=(grib_string_list*)grib_context_malloc_clear(c, sizeof(grib_string_list));
    sl->value = ret;
    if (!kiter->names) {
        kiter->names = sl;
    } else {
        /* Add to beginning of list for speed. Order doesn't matter */
        grib_string_list* tmp = kiter->names;
        kiter->names = sl;
        sl->next = tmp;
    }
    return ret;
}

grib_accessor* codes_bufr_keys_iterator_get_accessor(bufr_keys_iterator* kiter)
{
    return kiter->current;
}

int codes_bufr_keys_iterator_delete(bufr_keys_iterator* kiter)
{
    if (kiter) {
        grib_context* c = kiter->handle->context;
        grib_string_list* sl = kiter->names;
        while(sl) {
            grib_string_list* n = sl->next;
            grib_context_free(c, sl->value);
            grib_context_free(c, sl);
            sl = n;
        }
        kiter->names=NULL;
        if(kiter->seen)
            grib_trie_delete(kiter->seen);
        grib_context_free(c,kiter);
    }
    return 0;
}
