/*
 * (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"
#include "grib_accessor_classes_hash.c"
/*     grib level     */


/* This file is generated by ./make_class.pl */
#include "grib_accessor_class.h"

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

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

struct table_entry
{
    const char* type;
    grib_accessor_class** cclass;
};

#ifdef ACCESSOR_FACTORY_USE_TRIE
/* Note: A fast cut-down version of strcmp which does NOT return -1 */
/* 0 means input strings are equal and 1 means not equal */
static GRIB_INLINE int grib_inline_strcmp(const char* a, const char* b)
{
    if (*a != *b)
        return 1;
    while ((*a != 0 && *b != 0) && *(a) == *(b)) {
        a++;
        b++;
    }
    return (*a == 0 && *b == 0) ? 0 : 1;
}

static struct table_entry table[] = {
/* This file is generated by ./make_class.pl */
#include "grib_accessor_factory.h"
};
#endif /* ACCESSOR_FACTORY_USE_TRIE */

#define NUMBER(x) (sizeof(x) / sizeof(x[0]))

grib_section* grib_create_root_section(const grib_context* context, grib_handle* h)
{
    char* fpath     = 0;
    grib_section* s = (grib_section*)grib_context_malloc_clear(context, sizeof(grib_section));

    GRIB_MUTEX_INIT_ONCE(&once, &init);
    GRIB_MUTEX_LOCK(&mutex1);
    if (h->context->grib_reader == NULL) {
        if ((fpath = grib_context_full_defs_path(h->context, "boot.def")) == NULL) {
            grib_context_log(h->context, GRIB_LOG_FATAL,
                             "Unable to find boot.def. Context path=%s\n"
                             "\nPossible causes:\n"
                             "- The software is not correctly installed\n"
                             "- The environment variable ECCODES_DEFINITION_PATH is defined but incorrect\n",
                             context->grib_definition_files_path);
        }
        grib_parse_file(h->context, fpath);
    }
    GRIB_MUTEX_UNLOCK(&mutex1);

    s->h        = h;
    s->aclength = NULL;
    s->owner    = NULL;
    s->block    = (grib_block_of_accessors*)
        grib_context_malloc_clear(context, sizeof(grib_block_of_accessors));
    grib_context_log(context, GRIB_LOG_DEBUG, "Creating root section");
    return s;
}

/* Only used if ACCESSOR_FACTORY_USE_TRIE */
#ifdef ACCESSOR_FACTORY_USE_TRIE
static GRIB_INLINE grib_accessor_class* get_class(grib_context* c, char* type)
{
    int i;
    int table_count                 = 0;
    grib_accessor_class** the_class = NULL;

    if ((the_class = (grib_accessor_class**)grib_trie_get(c->classes, type)) != NULL)
        return *(the_class);

    table_count = NUMBER(table);
    for (i = 0; i < table_count; i++) {
        if (grib_inline_strcmp(type, table[i].type) == 0) {
            grib_trie_insert(c->classes, type, table[i].cclass);
            return *(table[i].cclass);
        }
    }
    grib_context_log(c, GRIB_LOG_ERROR, "ecCodes Version: %s\nDefinition files path: %s\n",
                     ECCODES_VERSION_STR, c->grib_definition_files_path);
    grib_context_log(c, GRIB_LOG_FATAL, "unable to create class %s", type);
    return NULL;
}
#endif /* ACCESSOR_FACTORY_USE_TRIE */

grib_accessor* grib_accessor_factory(grib_section* p, grib_action* creator,
                                     const long len, grib_arguments* params)
{
    grib_accessor_class* c = NULL;
    grib_accessor* a       = NULL;
    size_t size            = 0;

#ifdef ACCESSOR_FACTORY_USE_TRIE
    c = get_class(p->h->context, creator->op);
#else
    /* Use the hash table built with gperf (See make_accessor_class_hash.ksh) */
    c = *((grib_accessor_classes_hash(creator->op, strlen(creator->op)))->cclass);
#endif

    a = (grib_accessor*)grib_context_malloc_clear(p->h->context, c->size);

    a->name       = creator->name;
    a->name_space = creator->name_space;

    a->all_names[0]       = creator->name;
    a->all_name_spaces[0] = creator->name_space;

    a->creator  = creator;
    a->context  = p->h->context;
    a->h        = NULL;
    a->next     = NULL;
    a->previous = NULL;
    a->parent   = p;
    a->length   = 0;
    a->offset   = 0;
    a->flags    = creator->flags;
    a->set      = creator->set;

    if (p->block->last) {
        a->offset = grib_get_next_position_offset(p->block->last);
#if 0
        printf("offset: p->block->last %s %s %ld %ld\n",
                p->block->last->cclass->name,
                p->block->last->name,(long)p->block->last->offset,(long)p->block->last->length);
#endif
    }
    else {
        if (p->owner) {
            a->offset = p->owner->offset;
        }
        else
            a->offset = 0;
    }

    a->cclass = c;

    grib_init_accessor(a, len, params);
    size = grib_get_next_position_offset(a);

    if (size > p->h->buffer->ulength) {
        if (!p->h->buffer->growable) {
            if (!p->h->partial)
                grib_context_log(p->h->context, GRIB_LOG_ERROR,
                                 "Creating (%s)%s of %s at offset %ld-%ld over message boundary (%lu)",
                                 p->owner ? p->owner->name : "", a->name,
                                 creator->op, a->offset,
                                 a->offset + a->length,
                                 p->h->buffer->ulength);

            grib_accessor_delete(p->h->context, a);
            return NULL;
        }
        else {
            grib_context_log(p->h->context, GRIB_LOG_DEBUG,
                             "CREATE: name=%s class=%s offset=%ld length=%ld action=",
                             a->name, a->cclass->name, a->offset, a->length);

            grib_grow_buffer(p->h->context, p->h->buffer, size);
            p->h->buffer->ulength = size;
        }
    }

    if (p->h->context->debug == 1) {
        if (p->owner)
            grib_context_log(p->h->context, GRIB_LOG_DEBUG,
                             "Creating (%s)%s of %s at offset %d [len=%d]",
                             p->owner->name, a->name, creator->op, a->offset, len, p->block);
        else
            grib_context_log(p->h->context, GRIB_LOG_DEBUG,
                             "Creating root %s of %s at offset %d [len=%d]",
                             a->name, creator->op, a->offset, len, p->block);
    }

    return a;
}

static void link_same_attributes(grib_accessor* a, grib_accessor* b)
{
    int i                     = 0;
    int idx                   = 0;
    grib_accessor* bAttribute = NULL;
    if (a == NULL || b == NULL)
        return;
    if (!grib_accessor_has_attributes(b))
        return;
    while (i < MAX_ACCESSOR_ATTRIBUTES && a->attributes[i]) {
        bAttribute = _grib_accessor_get_attribute(b, a->attributes[i]->name, &idx);
        if (bAttribute)
            a->attributes[i]->same = bAttribute;
        i++;
    }
}

void grib_push_accessor(grib_accessor* a, grib_block_of_accessors* l)
{
    int id;
    grib_handle* hand = grib_handle_of_accessor(a);
    if (!l->first)
        l->first = l->last = a;
    else {
        l->last->next = a;
        a->previous   = l->last;
    }
    l->last = a;

    if (hand->use_trie) {
        DebugAssert( a->all_names[0] );
        if (*(a->all_names[0]) != '_') {
            id = grib_hash_keys_get_id(a->context->keys, a->all_names[0]);

            DebugAssert(id >= 0 && id < ACCESSORS_ARRAY_SIZE);

            a->same = hand->accessors[id];
            link_same_attributes(a, a->same);
            hand->accessors[id] = a;

            if (a->same == a) {
                fprintf(stderr, "---> %s\n", a->name);
                Assert(a->same != a);
            }
        }
    }
}

void grib_section_post_init(grib_section* s)
{
    grib_accessor* a = s ? s->block->first : NULL;

    while (a) {
        grib_accessor_class* c = a->cclass;
        if (c->post_init)
            c->post_init(a);
        if (a->sub_section)
            grib_section_post_init(a->sub_section);
        a = a->next;
    }
}

int grib_section_adjust_sizes(grib_section* s, int update, int depth)
{
    int err          = 0;
    grib_accessor* a = s ? s->block->first : NULL;
    size_t length    = update ? 0 : (s ? s->padding : 0);
    size_t offset    = (s && s->owner) ? s->owner->offset : 0;
    int force_update = update > 1;

    while (a) {
        register long l;
        /* grib_section_adjust_sizes(grib_get_sub_section(a),update,depth+1); */
        err = grib_section_adjust_sizes(a->sub_section, update, depth + 1);
        if (err)
            return err;
        /*grib_context_log(a->context,GRIB_LOG_DEBUG,"grib_section_adjust_sizes: %s %ld [len=%ld] (depth=%d)",a->name,(long)a->offset,(long)a->length,depth);*/

        l = a->length;

        if (offset != a->offset) {
            grib_context_log(a->context, GRIB_LOG_ERROR,
                             "Offset mismatch %s A->offset %ld offset %ld\n", a->name, (long)a->offset, (long)offset);
            a->offset = offset;
            return GRIB_DECODING_ERROR;
        }
        length += l;
        offset += l;
        a = a->next;
    }

    if (s) {
        if (s->aclength) {
            size_t len = 1;
            long plen  = 0;
            int lret   = grib_unpack_long(s->aclength, &plen, &len);
            Assert(lret == GRIB_SUCCESS);
            /* This happens when there is some padding */
            if ((plen != length) || force_update) {
                if (update) {
                    plen = length;
                    lret = grib_pack_long(s->aclength, &plen, &len);
                    Assert(lret == GRIB_SUCCESS);
                    s->padding = 0;
                }
                else {
                    if (!s->h->partial) {
                        if (length >= plen) {
                            if (s->owner) {
                                grib_context_log(s->h->context, GRIB_LOG_ERROR, "Invalid size %ld found for %s, assuming %ld",
                                             (long)plen, s->owner->name, (long)length);
                            }
                            plen = length;
                        }
                        s->padding = plen - length;
                    }
                    length = plen;
                }
            }
        }

        if (s->owner) {
            /*grib_context_log(s->owner->context,GRIB_LOG_DEBUG,"grib_section_adjust_sizes: updating owner (%s->length old=%ld new=%ld)",s->owner->name,(long)s->owner->length,(long)length);*/
            s->owner->length = length;
        }
        s->length = length;
    }
    return err;
}

int grib_get_block_length(grib_section* s, size_t* l)
{
    *l = s->length;
    return GRIB_SUCCESS;
#if 0

    /* TODO: Because grib_pack_long takes a SIGNED value, we may have problems */

    if(s->aclength)
    {
        size_t  len = 1;
        long plen = 0;

        int ret = grib_unpack_long(s->aclength, &plen, &len);
        if(ret == GRIB_SUCCESS && plen != 0)
        {
            *l = plen;
            return GRIB_SUCCESS;
        }
    }

    /* empty block */
    if(s->block->first == NULL)
    {
        *l = 0;
        return GRIB_SUCCESS;
    }
    /* no accessor for block length */
    if(s->owner)
        *l = grib_get_next_position_offset(s->block->last) - s->owner->offset;
    else
        *l = grib_get_next_position_offset(s->block->last);


    if(s->aclength)
    {
        size_t  len = 1;
        long plen = *l;

        int ret = grib_pack_long(s->aclength, &plen, &len);
        if(ret != GRIB_SUCCESS)
            ;
        if(s->h->context->debug)
            printf("SECTION updating length %ld %s\n",plen,s->owner->name);
    }

    /*
     if(s->aclength)
     Assert(*l == plen);*/

    return GRIB_SUCCESS;
#endif
}

grib_accessor* find_paddings(grib_section* s)
{
    grib_accessor* a = s ? s->block->first : NULL;

    while (a) {
        /* grib_accessor* p = find_paddings(grib_get_sub_section(a)); */
        grib_accessor* p = find_paddings(a->sub_section);
        if (p)
            return p;

        if (grib_preferred_size(a, 0) != a->length)
            return a;

        a = a->next;
    }

    return NULL;
}

void grib_update_paddings(grib_section* s)
{
    grib_accessor* last = NULL;
    grib_accessor* changed;

    /* while((changed = find_paddings(s)) != NULL) */
    while ((changed = find_paddings(s->h->root)) != NULL) {
        Assert(changed != last);
        grib_resize(changed, grib_preferred_size(changed, 0));
        last = changed;
    }
}
