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/* This file is part of Eclat.
   Copyright (C) 2012 Sergey Poznyakoff.
 
   Eclat is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.
 
   Eclat is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with Eclat.  If not, see <http://www.gnu.org/licenses/>. */

#include "libeclat.h"
#include <gdbm.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>

struct gdbm_map {
	char *name;
	GDBM_FILE file;
	struct grecs_locus locus;
	int nullflag;
};

static int
gdbm_map_config(int dbg, struct grecs_node *node, void *data)
{
	struct gdbm_map *gdbm_map, **return_gdbm_map = data;
	const char *filename;
	struct grecs_node *p;
	
	if (eclat_get_string_node(node, "file", 0, &p))
		return eclat_map_failure;
	gdbm_map = grecs_malloc(sizeof(*gdbm_map));
	gdbm_map->name = grecs_strdup(p->v.value->v.string);
	gdbm_map->locus = p->locus;
	switch (eclat_get_string_node(node, "null", 1, &p)) {
	case eclat_map_failure:
		return eclat_map_failure;
	case eclat_map_not_found:
		break;
	case eclat_map_ok:
		if (grecs_string_convert(&gdbm_map->nullflag, grecs_type_bool,
					 p->v.value->v.string,
					 &p->locus))
			return eclat_map_failure;
	}
		
	*return_gdbm_map = gdbm_map;
	return eclat_map_ok;
}

static void
gdbm_map_free(int dbg, void *data)
{
	struct gdbm_map *gdbm_map = data;
	free(gdbm_map->name);
	free(gdbm_map);
}

static int
gdbm_map_open(int dbg, void *data)
{
	struct gdbm_map *gdbm_map = data;

	gdbm_map->file = gdbm_open(gdbm_map->name, 512, GDBM_READER, O_RDONLY,
				   NULL);
	if (gdbm_map->file == NULL)
		return eclat_map_failure;
	return eclat_map_ok;
}

static int
gdbm_map_close(int dbg, void *data)
{
	struct gdbm_map *gdbm_map = data;
	gdbm_close(gdbm_map->file);
	return eclat_map_ok;
}

static int
gdbm_map_get(int dbg, void *data, const char *key, char **return_value)
{
	struct gdbm_map *gdbm_map = data;
	datum keydat, content;

	keydat.dptr = (char*)key;
	keydat.dsize = strlen(key) + (gdbm_map->nullflag ? 1 : 0);
	gdbm_errno = 0;
	content = gdbm_fetch(gdbm_map->file, keydat);
	if (content.dptr == NULL) {
		if (gdbm_errno == GDBM_ITEM_NOT_FOUND)
			return eclat_map_not_found;
		err("%s: %s", gdbm_map->name, gdbm_strerror(gdbm_errno));
		return eclat_map_failure;
	}
	*return_value = grecs_malloc(content.dsize + 1);
	memcpy(*return_value, content.dptr, content.dsize);
	(*return_value)[content.dsize] = 0;
	free (content.dptr);
	return eclat_map_ok;
}

struct eclat_map_drv eclat_map_drv_gdbm = {
	"gdbm",
	gdbm_map_config,
	gdbm_map_open,
	gdbm_map_close,
	gdbm_map_get,
	gdbm_map_free
};

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