/* $NetBSD: citrus_pivot_factory.c,v 1.7 2009/04/12 14:20:19 lukem Exp $ */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c)2003 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/queue.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "citrus_namespace.h"
#include "citrus_region.h"
#include "citrus_bcs.h"
#include "citrus_db_factory.h"
#include "citrus_db_hash.h"
#include "citrus_pivot_file.h"
#include "citrus_pivot_factory.h"

struct src_entry {
        char                            *se_name;
        struct _citrus_db_factory       *se_df;
        STAILQ_ENTRY(src_entry)          se_entry;
};
STAILQ_HEAD(src_head, src_entry);

static int
find_src(struct src_head *sh, struct src_entry **rse, const char *name)
{
        int ret;
        struct src_entry *se;

        STAILQ_FOREACH(se, sh, se_entry) {
                if (_bcs_strcasecmp(se->se_name, name) == 0) {
                        *rse = se;
                        return (0);
                }
        }
        se = malloc(sizeof(*se));
        if (se == NULL)
                return (errno);
        se->se_name = strdup(name);
        if (se->se_name == NULL) {
                ret = errno;
                free(se);
                return (ret);
        }
        ret = _db_factory_create(&se->se_df, &_db_hash_std, NULL);
        if (ret) {
                free(se->se_name);
                free(se);
                return (ret);
        }
        STAILQ_INSERT_TAIL(sh, se, se_entry);
        *rse = se;

        return (0);
}

static void
free_src(struct src_head *sh)
{
        struct src_entry *se;

        while ((se = STAILQ_FIRST(sh)) != NULL) {
                STAILQ_REMOVE_HEAD(sh, se_entry);
                _db_factory_free(se->se_df);
                free(se->se_name);
                free(se);
        }
}


#define T_COMM '#'
static int
convert_line(struct src_head *sh, const char *line, size_t len)
{
        struct src_entry *se;
        const char *p;
        char key1[LINE_MAX], key2[LINE_MAX], data[LINE_MAX];
        char *ep;
        uint32_t val;
        int ret;

        se = NULL;

        /* cut off trailing comment */
        p = memchr(line, T_COMM, len);
        if (p)
                len = p - line;

        /* key1 */
        line = _bcs_skip_ws_len(line, &len);
        if (len == 0)
                return (0);
        p = _bcs_skip_nonws_len(line, &len);
        if (p == line)
                return (0);
        snprintf(key1, sizeof(key1), "%.*s", (int)(p - line), line);

        /* key2 */
        line = _bcs_skip_ws_len(p, &len);
        if (len == 0)
                return (0);
        p = _bcs_skip_nonws_len(line, &len);
        if (p == line)
                return (0);
        snprintf(key2, sizeof(key2), "%.*s", (int)(p - line), line);

        /* data */
        line = _bcs_skip_ws_len(p, &len);
        _bcs_trunc_rws_len(line, &len);
        snprintf(data, sizeof(data), "%.*s", (int)len, line);
        val = strtoul(data, &ep, 0);
        if (*ep != '\0')
                return (EFTYPE);

        /* insert to DB */
        ret = find_src(sh, &se, key1);
        if (ret)
                return (ret);

        return (_db_factory_add32_by_s(se->se_df, key2, val));
}

static int
dump_db(struct src_head *sh, struct _region *r)
{
        struct _db_factory *df;
        struct src_entry *se;
        struct _region subr;
        void *ptr;
        size_t size;
        int ret;

        ret = _db_factory_create(&df, &_db_hash_std, NULL);
        if (ret)
                return (ret);

        STAILQ_FOREACH(se, sh, se_entry) {
                size = _db_factory_calc_size(se->se_df);
                ptr = malloc(size);
                if (ptr == NULL)
                        goto quit;
                _region_init(&subr, ptr, size);
                ret = _db_factory_serialize(se->se_df, _CITRUS_PIVOT_SUB_MAGIC,
                    &subr);
                if (ret)
                        goto quit;
                ret = _db_factory_add_by_s(df, se->se_name, &subr, 1);
                if (ret)
                        goto quit;
        }

        size = _db_factory_calc_size(df);
        ptr = malloc(size);
        if (ptr == NULL)
                goto quit;
        _region_init(r, ptr, size);

        ret = _db_factory_serialize(df, _CITRUS_PIVOT_MAGIC, r);
        ptr = NULL;

quit:
        free(ptr);
        _db_factory_free(df);
        return (ret);
}

int
_citrus_pivot_factory_convert(FILE *out, FILE *in)
{
        struct src_head sh;
        struct _region r;
        char *line;
        size_t size;
        int ret;

        STAILQ_INIT(&sh);

        while ((line = fgetln(in, &size)) != NULL)
                if ((ret = convert_line(&sh, line, size))) {
                        free_src(&sh);
                        return (ret);
                }

        ret = dump_db(&sh, &r);
        free_src(&sh);
        if (ret)
                return (ret);

        if (fwrite(_region_head(&r), _region_size(&r), 1, out) != 1)
                return (errno);

        return (0);
}