/*
  +----------------------------------------------------------------------+
  | Copyright (c) The PHP Group                                          |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | https://www.php.net/license/3_01.txt                                 |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Anatol Belski <ab@php.net>                                   |
  +----------------------------------------------------------------------+
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"

#if DBA_LMDB
#include "php_lmdb.h"

#ifdef LMDB_INCLUDE_FILE
#include LMDB_INCLUDE_FILE
#endif

struct php_lmdb_info {
	MDB_env *env;
	MDB_txn *txn;
	MDB_dbi dbi;
	MDB_cursor *cur;
};

#define LMDB_IT(it) (((struct php_lmdb_info *)info->dbf)->it)

DBA_OPEN_FUNC(lmdb)
{
	MDB_env *env;
	MDB_txn *txn;
	int rc, mode = 0644, flags = MDB_NOSUBDIR;
	zend_long mapsize = 0;

	if(info->argc > 0) {
		mode = zval_get_long(&info->argv[0]);

		if (info->argc > 1) {
			mapsize = zval_get_long(&info->argv[1]);
			if (mapsize < 0) {
				*error = "mapsize must be greater than or equal to zero";
				return FAILURE;
			}
		}
		/* TODO implement handling of the additional flags. */
	}

	rc = mdb_env_create(&env);
	if (rc) {
		*error = mdb_strerror(rc);
		return FAILURE;
	}

	if (mapsize > 0) {
		rc = mdb_env_set_mapsize(env, (size_t) mapsize);
		if (rc) {
			*error = mdb_strerror(rc);
			return FAILURE;
		}
	}

	rc = mdb_env_open(env, info->path, flags, mode);
	if (rc) {
		mdb_env_close(env);
		*error = mdb_strerror(rc);
		return FAILURE;
	}

	rc = mdb_txn_begin(env, NULL, 0, &txn);
	if (rc) {
		mdb_env_close(env);
		*error = mdb_strerror(rc);
		return FAILURE;
	}

	info->dbf = pemalloc(sizeof(struct php_lmdb_info), info->flags & DBA_PERSISTENT);
	if (!info->dbf) {
		*error = "Failed to allocate php_lmdb_info.";
		return FAILURE;
	}
	memset(info->dbf, 0, sizeof(struct php_lmdb_info));

	rc = mdb_dbi_open(txn, NULL, 0, &LMDB_IT(dbi));
	if (rc) {
		mdb_env_close(env);
		pefree(info->dbf, info->flags & DBA_PERSISTENT);
		*error = mdb_strerror(rc);
		return FAILURE;
	}

	LMDB_IT(env) = env;
	LMDB_IT(txn) = txn;

	mdb_txn_abort(LMDB_IT(txn));

	return SUCCESS;
}

DBA_CLOSE_FUNC(lmdb)
{
	mdb_dbi_close(LMDB_IT(env), LMDB_IT(dbi));
	mdb_env_close(LMDB_IT(env));

	pefree(info->dbf, info->flags & DBA_PERSISTENT);
}

DBA_FETCH_FUNC(lmdb)
{
	int rc;
	MDB_val k, v;
	char *ret = NULL;

	if (LMDB_IT(cur)) {
		rc = mdb_txn_renew(LMDB_IT(txn));
	} else {
		rc = mdb_txn_begin(LMDB_IT(env), NULL, MDB_RDONLY, &LMDB_IT(txn));
	}
	if (rc) {
		php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
		return NULL;
	}

	k.mv_size = keylen;
	k.mv_data = key;

	rc = mdb_get(LMDB_IT(txn), LMDB_IT(dbi), &k, &v);
	if (rc) {
		if (MDB_NOTFOUND != rc) {
			php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
		}
		mdb_txn_abort(LMDB_IT(txn));
		return NULL;
	}

	if (v.mv_data) {
		if(newlen) *newlen = v.mv_size;
		ret = estrndup(v.mv_data, v.mv_size);
	}

	if (LMDB_IT(cur)) {
		mdb_txn_reset(LMDB_IT(txn));
	} else {
		mdb_txn_abort(LMDB_IT(txn));
	}

	return ret;
}

DBA_UPDATE_FUNC(lmdb)
{
	int rc;
	MDB_val k, v;

	rc = mdb_txn_begin(LMDB_IT(env), NULL, 0, &LMDB_IT(txn));
	if (rc) {
		php_error_docref2(NULL, key, val, E_WARNING, "%s", mdb_strerror(rc));
		return FAILURE;
	}

	k.mv_size = keylen;
	k.mv_data = key;
	v.mv_size = vallen;
	v.mv_data = val;

	rc = mdb_put(LMDB_IT(txn), LMDB_IT(dbi), &k, &v, mode == 1 ? MDB_NOOVERWRITE : 0);
	if (rc) {
		if (MDB_KEYEXIST != rc) {
			php_error_docref2(NULL, key, val, E_WARNING, "%s", mdb_strerror(rc));
		}
		mdb_txn_abort(LMDB_IT(txn));
		return FAILURE;
	}

	rc = mdb_txn_commit(LMDB_IT(txn));
	if (rc) {
		php_error_docref2(NULL, key, val, E_WARNING, "%s", mdb_strerror(rc));
		mdb_txn_abort(LMDB_IT(txn));
		return FAILURE;
	}

	return SUCCESS;
}

DBA_EXISTS_FUNC(lmdb)
{
	int rc;
	MDB_val k, v;

	if (LMDB_IT(cur)) {
		rc = mdb_txn_renew(LMDB_IT(txn));
	} else {
		rc = mdb_txn_begin(LMDB_IT(env), NULL, MDB_RDONLY, &LMDB_IT(txn));
	}
	if (rc) {
		php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
		return FAILURE;
	}

	k.mv_size = keylen;
	k.mv_data = key;

	rc = mdb_get(LMDB_IT(txn), LMDB_IT(dbi), &k, &v);
	if (rc) {
		if (MDB_NOTFOUND != rc) {
			php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
		}
		mdb_txn_abort(LMDB_IT(txn));
		return FAILURE;
	}

	if (LMDB_IT(cur)) {
		mdb_txn_reset(LMDB_IT(txn));
	} else {
		mdb_txn_abort(LMDB_IT(txn));
	}

	return SUCCESS;
}

DBA_DELETE_FUNC(lmdb)
{
	int rc;
	MDB_val k;

	rc = mdb_txn_begin(LMDB_IT(env), NULL, 0, &LMDB_IT(txn));
	if (rc) {
		php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
		return FAILURE;
	}

	k.mv_size = keylen;
	k.mv_data = key;

	rc = mdb_del(LMDB_IT(txn), LMDB_IT(dbi), &k, NULL);
	if (!rc) {
		rc = mdb_txn_commit(LMDB_IT(txn));
		if (rc) {
			php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));
			mdb_txn_abort(LMDB_IT(txn));
			return FAILURE;
		}
		return SUCCESS;
	}

	php_error_docref1(NULL, key, E_WARNING, "%s", mdb_strerror(rc));

	mdb_txn_abort(LMDB_IT(txn));
	return FAILURE;
}

DBA_FIRSTKEY_FUNC(lmdb)
{
	int rc;
	MDB_val k, v;
	char *ret = NULL;

	rc = mdb_txn_begin(LMDB_IT(env), NULL, MDB_RDONLY, &LMDB_IT(txn));
	if (rc) {
		php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
		return NULL;
	}

	rc = mdb_cursor_open(LMDB_IT(txn), LMDB_IT(dbi), &LMDB_IT(cur));
	if (rc) {
		mdb_txn_abort(LMDB_IT(txn));
		php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
		return NULL;
	}

	rc = mdb_cursor_get(LMDB_IT(cur), &k, &v, MDB_FIRST);
	if (rc) {
		mdb_txn_abort(LMDB_IT(txn));
		mdb_cursor_close(LMDB_IT(cur));
		LMDB_IT(cur) = NULL;
		if (MDB_NOTFOUND != rc) {
			php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
		}
		return NULL;
	}

	if(k.mv_data) {
		if(newlen) *newlen = k.mv_size;
		ret = estrndup(k.mv_data, k.mv_size);
	}

	mdb_txn_reset(LMDB_IT(txn));

	return ret;
}

DBA_NEXTKEY_FUNC(lmdb)
{
	int rc;
	MDB_val k, v;
	char *ret = NULL;

	rc = mdb_txn_renew(LMDB_IT(txn));
	if (rc) {
		php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
		return NULL;
	}

	rc = mdb_cursor_get(LMDB_IT(cur), &k, &v, MDB_NEXT);
	if (rc) {
		mdb_txn_abort(LMDB_IT(txn));
		mdb_cursor_close(LMDB_IT(cur));
		LMDB_IT(cur) = NULL;
		if (MDB_NOTFOUND != rc) {
			php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
		}
		return NULL;
	}

	if(k.mv_data) {
		if(newlen) *newlen = k.mv_size;
		ret = estrndup(k.mv_data, k.mv_size);
	}

	mdb_txn_reset(LMDB_IT(txn));

	return ret;
}

DBA_OPTIMIZE_FUNC(lmdb)
{
	return SUCCESS;
}

DBA_SYNC_FUNC(lmdb)
{
	int rc;

	rc = mdb_env_sync(LMDB_IT(env), 1);
	if (rc) {
			php_error_docref(NULL, E_WARNING, "%s", mdb_strerror(rc));
			return FAILURE;
	}

	return SUCCESS;
}

DBA_INFO_FUNC(lmdb)
{
	return estrdup(MDB_VERSION_STRING);
}

#endif
