/* 
   Unix SMB/CIFS implementation.
   Registry interface
   Copyright (C) Jelmer Vernooij  2004.
   
   This program 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 2 of the License, or
   (at your option) any later version.
   
   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "lib/registry/common/registry.h"

static char *reg_path_to_ldb(TALLOC_CTX *mem_ctx, const char *path, const char *add)
{
	char *ret = talloc_strdup(mem_ctx, "");
	char *mypath = strdup(path);
	char *end = mypath, *begin;

	if(add) 
		ret = talloc_asprintf_append(mem_ctx, ret, "%s", add);

	while(end) {
		char *keyname;
		begin = strrchr(end, '\\');

		if(begin) keyname = begin + 1;
		else keyname = mypath;

		if(strlen(keyname))
			ret = talloc_asprintf_append(mem_ctx, ret, "key=%s,", keyname);
			
		if(begin) {
			begin[0] = '\0';
			end = begin-1;
		} else {
			end = NULL;
		}
	}

	SAFE_FREE(mypath);

	ret[strlen(ret)-1] = '\0';
	
	printf("Doing search for : %s\n", ret);
	return ret;
}

/* 
 * Saves the dn as private_data for every key/val
 */

static WERROR ldb_open_registry(REG_HANDLE *handle, const char *location, const char *credentials)
{
	struct ldb_context *c;

	if (!location) return WERR_INVALID_PARAM;
	c = ldb_connect(location, 0, NULL);

	ldb_set_debug_stderr(c);

	if(!c) return WERR_FOOBAR;

	handle->backend_data = c;
	
	return WERR_OK;
}

static WERROR ldb_close_registry(REG_HANDLE *h) 
{
	ldb_close((struct ldb_context *)h->backend_data);
	return WERR_OK;
}

static WERROR ldb_fetch_subkeys(REG_KEY *k, int *count, REG_KEY ***subkeys)
{
	struct ldb_context *c = k->handle->backend_data;
	char *path;
	int ret, i, j;
	struct ldb_message **msg;
	TALLOC_CTX *mem_ctx = talloc_init("ldb_path");
	REG_KEY *key = NULL;

	ret = ldb_search(c, (char *)k->backend_data, LDB_SCOPE_ONELEVEL, "(key=*)", NULL,&msg);

	if(ret < 0) {
		DEBUG(0, ("Error getting subkeys for '%s': %s\n", k->backend_data, ldb_errstring(c)));
		return WERR_FOOBAR;
	}

	*subkeys = talloc_array_p(k->mem_ctx, REG_KEY *, ret);
	j = 0;
	for(i = 0; i < ret; i++) {
		struct ldb_message_element *el;
		char *name;
		el = ldb_msg_find_element(msg[i], "key");

		name = el->values[0].data;

		/* Dirty hack to circumvent ldb_tdb bug */
		if(k->backend_data && !strcmp(msg[i]->dn, (char *)k->backend_data)) continue;
			
		(*subkeys)[j] = reg_key_new_rel(name, k, NULL);
		(*subkeys)[j]->backend_data = talloc_strdup((*subkeys)[j]->mem_ctx, msg[i]->dn);
		j++;
	}
	*count = j;

	ldb_search_free(c, msg);
	talloc_destroy(mem_ctx);
	return WERR_OK;
}

static WERROR ldb_get_hive(REG_HANDLE *h, int num, REG_KEY **key)
{
	if(num != 0) return WERR_NO_MORE_ITEMS;
	*key = reg_key_new_abs("", h, NULL);
//	(*key)->backend_data = talloc_strdup((*key)->mem_ctx, "");
	return WERR_OK;
}

static WERROR ldb_open_key(REG_HANDLE *h, int num, const char *name, REG_KEY **key)
{
	struct ldb_context *c = h->backend_data;
	char *path;
	struct ldb_message **msg;
	char *ldap_path, *new_ldap_path;
	int ret;
	TALLOC_CTX *mem_ctx = talloc_init("ldb_path");
	if(num != 0) return WERR_NO_MORE_ITEMS;
	ldap_path = reg_path_to_ldb(mem_ctx, name, NULL);
	
	ret = ldb_search(c, ldap_path, LDB_SCOPE_BASE, "*", NULL,&msg);

	if(ret == 0) {
		return WERR_NO_MORE_ITEMS;
	} else if(ret < 0) {
		DEBUG(0, ("Error opening key '%s': %s\n", ldap_path, ldb_errstring(c)));
		return WERR_FOOBAR;
	}

	*key = reg_key_new_abs(name, h, ldap_path);
	talloc_steal(mem_ctx, (*key)->mem_ctx, ldap_path);
	printf("Got something!\n");
	/* FIXME */

	ldb_search_free(c, msg);
	talloc_destroy(mem_ctx);

	return WERR_OK;
}

static struct registry_ops reg_backend_ldb = {
	.name = "ldb",
	.open_registry = ldb_open_registry,
	.get_hive = ldb_get_hive,
	.close_registry = ldb_close_registry,
	.open_key = ldb_open_key,
	.fetch_subkeys = ldb_fetch_subkeys,
};

NTSTATUS registry_ldb_init(void)
{
	return register_backend("registry", &reg_backend_ldb);
}