<?php

if (!defined('BB_ROOT')) die(basename(__FILE__));

define('ONLY_NEW_POSTS',  1);
define('ONLY_NEW_TOPICS', 2);

class user_common
{
	/**
	*  Config
	*/
	var $cfg = array(
		'req_login'         => false,    // requires user to be logged in
		'req_session_admin' => false,    // requires active admin session (for moderation or admin actions)
	);

	/**
	*  PHP-JS exchangeable options (JSON'ized as {USER_OPTIONS_JS} in TPL)
	*/
	var $opt_js = array(
		'only_new' => 0,     // show ony new posts or topics
		'h_av'     => 0,     // hide avatar
		'h_rnk_i'  => 0,     // hide rank images
		'h_post_i' => 0,     // hide post images
		'h_smile'  => 0,     // hide smilies
		'h_sig'    => 0,     // hide signatures
		'sp_op'    => 0,     // show spoiler opened
		'tr_t_ax'  => 0,     // ajax open topics
		'tr_t_t'   => 0,     // show time of the creation topics
		'hl_tr'    => 1,     // show cursor in tracker.php
		'i_aft_l'  => 0,     // show images only after full loading
		'h_tsp'    => 0,     // show released title {...}
	);

	/**
	 *  Defaults options for guests
	 */
	var $opt_js_guest = array(
		'h_av'     => 1,     // hide avatar
		'h_rnk_i'  => 1,     // hide rank images
		'h_sig'    => 1,     // hide signatures
	);

	/**
	*  Sessiondata
	*/
	var $sessiondata = array(
		'uk'  => null,
		'uid' => null,
		'sid' => '',
	);

	/**
	*  Old $userdata
	*/
	var $data = array();

	/**
	*  Shortcuts
	*/
	var $id = null;
	var $ip;
	var $lastvisit;
	var $regdate;
	var $opt;
	var $name;
	var $active;
	var $level;

	/**
	*  Misc
	*/
	var $show_ads = false;

	/**
	*  Constructor
	*/
	function user_common ()
	{
		$this->get_sessiondata();
	}

	/**
	*  Start session (restore existent session or create new)
	*/
	function session_start ($cfg = array())
	{
		global $bb_cfg;

		$update_sessions_table = false;
		$this->cfg = array_merge($this->cfg, $cfg);

		$session_id = $this->sessiondata['sid'];

		// Does a session exist?
		if ($session_id || !$this->sessiondata['uk'])
		{
			$SQL = DB()->get_empty_sql_array();

			$SQL['SELECT'][] = "u.*, s.*";

			$SQL['FROM'][] = BB_SESSIONS ." s";
			$SQL['INNER JOIN'][] = BB_USERS ." u ON(u.user_id = s.session_user_id)";

			if ($session_id)
			{
				$SQL['WHERE'][] = "s.session_id = '$session_id'";

				if ($bb_cfg['torhelp_enabled'])
				{
					$SQL['SELECT'][] = "th.topic_id_csv AS torhelp";
					$SQL['LEFT JOIN'][] = BB_BT_TORHELP ." th ON(u.user_id = th.user_id)";
				}

				$userdata_cache_id = $session_id;
			}
			else
			{
				$SQL['WHERE'][] = "s.session_ip = '". USER_IP ."'";
				$SQL['WHERE'][] = "s.session_user_id = ". GUEST_UID;

				$userdata_cache_id = USER_IP;
			}

			if (!$this->data = cache_get_userdata($userdata_cache_id))
			{
				$this->data = DB()->fetch_row($SQL);

				if ($this->data && (TIMENOW - $this->data['session_time']) > $bb_cfg['session_update_intrv'])
				{
					$this->data['session_time'] = TIMENOW;
					$update_sessions_table = true;
				}

				cache_set_userdata($this->data);
			}
		}

		// Did the session exist in the DB?
		if ($this->data)
		{
			// Do not check IP assuming equivalence, if IPv4 we'll check only first 24
			// bits ... I've been told (by vHiker) this should alleviate problems with
			// load balanced et al proxies while retaining some reliance on IP security.
			$ip_check_s = substr($this->data['session_ip'], 0, 6);
			$ip_check_u = substr(USER_IP, 0, 6);

			if ($ip_check_s == $ip_check_u)
			{
				if ($this->data['user_id'] != GUEST_UID && defined('IN_ADMIN'))
				{
					define('SID_GET', "sid={$this->data['session_id']}");
				}
				$session_id = $this->sessiondata['sid'] = $this->data['session_id'];

				// Only update session a minute or so after last update
				if ($update_sessions_table)
				{
					DB()->query("
						UPDATE ". BB_SESSIONS ." SET
							session_time = ". TIMENOW ."
						WHERE session_id = '$session_id'
						LIMIT 1
					");
				}
				$this->set_session_cookies($this->data['user_id']);
			}
			else
			{
				$this->data = array();
			}
		}
		// If we reach here then no (valid) session exists. So we'll create a new one,
		// using the cookie user_id if available to pull basic user prefs.
		if (!$this->data)
		{
			$login = false;
			$user_id = ($bb_cfg['allow_autologin'] && $this->sessiondata['uk'] && $this->sessiondata['uid']) ? $this->sessiondata['uid'] : GUEST_UID;

			if ($userdata = get_userdata(intval($user_id), false, true))
			{
				if ($userdata['user_id'] != GUEST_UID && $userdata['user_active'])
				{
					if (verify_id($this->sessiondata['uk'], LOGIN_KEY_LENGTH) && $this->verify_autologin_id($userdata, true, false))
					{
						$login = ($userdata['autologin_id'] && $this->sessiondata['uk'] === $userdata['autologin_id']);
					}
				}
			}
			if (!$userdata || ($userdata['user_id'] != GUEST_UID && !$login))
			{
				$userdata = get_userdata(GUEST_UID, false, true);
			}

			$this->session_create($userdata, true);
		}

		define('IS_GUEST',        (!$this->data['session_logged_in']));
		define('IS_ADMIN',        (!IS_GUEST && $this->data['user_level'] == ADMIN));
		define('IS_MOD',          (!IS_GUEST && $this->data['user_level'] == MOD));
		define('IS_GROUP_MEMBER', (!IS_GUEST && $this->data['user_level'] == GROUP_MEMBER));
		define('IS_USER',         (!IS_GUEST && $this->data['user_level'] == USER));
		define('IS_SUPER_ADMIN',  (IS_ADMIN && isset($bb_cfg['super_admins'][$this->data['user_id']])));
		define('IS_AM',           (IS_ADMIN || IS_MOD));

		$this->set_shortcuts();

		// Redirect guests to login page
		if (IS_GUEST && $this->cfg['req_login'])
		{
			login_redirect();
		}

		$this->init_userprefs();

		return $this->data;
	}

	/**
	*  Create new session for the given user
	*/
	function session_create ($userdata, $auto_created = false)
	{
		global $bb_cfg, $lang;

		$this->data = $userdata;
		$session_id = $this->sessiondata['sid'];

		$login   = (int) ($this->data['user_id'] != GUEST_UID);
		$is_user = ($this->data['user_level'] != ADMIN);
		$user_id = (int) $this->data['user_id'];
		$mod_admin_session = ($this->data['user_level'] == ADMIN || $this->data['user_level'] == MOD);

		// Initial ban check against user_id or IP address
		if ($is_user)
		{
			preg_match('#(..)(..)(..)(..)#', USER_IP, $ip);

			$where_sql  = "ban_ip IN('". USER_IP ."', '$ip[1]$ip[2]$ip[3]ff', '$ip[1]$ip[2]ffff', '$ip[1]ffffff')";
			$where_sql .= ($login) ? " OR ban_userid = $user_id" : '';

			$sql = "SELECT ban_id FROM ". BB_BANLIST ." WHERE $where_sql LIMIT 1";

			if (DB()->fetch_row($sql))
			{
				bb_simple_die($lang['YOU_BEEN_BANNED']);
			}
		}

		// Create new session
		for ($i=0, $max_try=5; $i <= $max_try; $i++)
		{
			$session_id = make_rand_str(SID_LENGTH);

			$args = DB()->build_array('INSERT', array(
				'session_id'        => (string) $session_id,
				'session_user_id'   => (int) $user_id,
				'session_start'     => (int) TIMENOW,
				'session_time'      => (int) TIMENOW,
				'session_ip'        => (string) USER_IP,
				'session_logged_in' => (int) $login,
				'session_admin'     => (int) $mod_admin_session,
			));
			$sql = "INSERT INTO ". BB_SESSIONS . $args;

			if (@DB()->query($sql))
			{
				break;
			}
			if ($i == $max_try)
			{
				trigger_error('Error creating new session', E_USER_ERROR);
			}
		}
		// Update last visit for logged in users
		if ($login)
		{
			$last_visit = $this->data['user_lastvisit'];

			if (!$session_time = $this->data['user_session_time'])
			{
				$last_visit = TIMENOW;
				define('FIRST_LOGON', true);
			}
			else if ($session_time < (TIMENOW - $bb_cfg['last_visit_update_intrv']))
			{
				$last_visit = max($session_time, (TIMENOW - 86400*$bb_cfg['max_last_visit_days']));
			}

			if ($last_visit != $this->data['user_lastvisit'])
			{
				DB()->query("
					UPDATE ". BB_USERS ." SET
						user_session_time = ". TIMENOW .",
						user_lastvisit = $last_visit,
						user_last_ip = '". USER_IP ."',
						user_reg_ip = IF(user_reg_ip = '', '". USER_IP ."', user_reg_ip)
					WHERE user_id = $user_id
					LIMIT 1
				");

				bb_setcookie(COOKIE_TOPIC, '');
				bb_setcookie(COOKIE_FORUM, '');

				$this->data['user_lastvisit'] = $last_visit;
			}
			if (!empty($_POST['autologin']) && $bb_cfg['allow_autologin'])
			{
				if (!$auto_created)
				{
					$this->verify_autologin_id($this->data, true, true);
				}
				$this->sessiondata['uk'] = $this->data['autologin_id'];
			}
			$this->sessiondata['uid'] = $user_id;
			$this->sessiondata['sid'] = $session_id;
		}
		$this->data['session_id'] = $session_id;
		$this->data['session_ip'] = USER_IP;
		$this->data['session_user_id'] = $user_id;
		$this->data['session_logged_in'] = $login;
		$this->data['session_start'] = TIMENOW;
		$this->data['session_time'] = TIMENOW;
		$this->data['session_admin'] = $mod_admin_session;

		$this->set_session_cookies($user_id);

		if ($login && (defined('IN_ADMIN') || $mod_admin_session))
		{
			define('SID_GET', "sid=$session_id");
		}

		cache_set_userdata($this->data);

		return $this->data;
	}

	/**
	*  Initialize sessiondata stored in cookies
	*/
	function session_end ($update_lastvisit = false, $set_cookie = true)
	{
		cache_rm_userdata($this->data);
		DB()->query("
			DELETE FROM ". BB_SESSIONS ."
			WHERE session_id = '{$this->data['session_id']}'
		");

		if (!IS_GUEST)
		{
			if ($update_lastvisit)
			{
				DB()->query("
					UPDATE ". BB_USERS ." SET
						user_session_time = ". TIMENOW .",
						user_lastvisit = ". TIMENOW .",
						user_last_ip = '". USER_IP ."',
						user_reg_ip = IF(user_reg_ip = '', '". USER_IP ."', user_reg_ip)
					WHERE user_id = {$this->data['user_id']}
					LIMIT 1
				");
			}

			if (isset($_REQUEST['reset_autologin']))
			{
				$this->create_autologin_id($this->data, false);

				cache_rm_user_sessions($this->data['user_id']);
				DB()->query("
					DELETE FROM ". BB_SESSIONS ."
					WHERE session_user_id = '{$this->data['user_id']}'
				");
			}
		}

		if ($set_cookie)
		{
			$this->set_session_cookies(GUEST_UID);
		}
	}

	/**
	*  Login
	*/
	function login ($args, $mod_admin_login = false)
	{
		$username = !empty($args['login_username']) ? clean_username($args['login_username']) : '';
		$password = !empty($args['login_password']) ? $args['login_password'] : '';

		if ($username && $password)
		{
			$username_sql = str_replace("\\'", "''", $username);
			$password_sql = md5(md5($password));

			$sql = "
				SELECT *
				FROM ". BB_USERS ."
				WHERE username = '$username_sql'
				  AND user_password = '$password_sql'
				  AND user_active = 1
				  AND user_id != ". GUEST_UID ."
				LIMIT 1
			";

			if ($userdata = DB()->fetch_row($sql))
			{
				if (!$userdata['username'] || !$userdata['user_password'] || $userdata['user_id'] == GUEST_UID || md5(md5($password)) !== $userdata['user_password'] || !$userdata['user_active'])
				{
					trigger_error('invalid userdata', E_USER_ERROR);
				}

				// Start mod/admin session
				if ($mod_admin_login)
				{
					DB()->query("
						UPDATE ". BB_SESSIONS ." SET
							session_admin = ". $this->data['user_level'] ."
						WHERE session_user_id = ". $this->data['user_id'] ."
							AND session_id = '". $this->data['session_id'] ."'
					");
					$this->data['session_admin'] = $this->data['user_level'];
					cache_update_userdata($this->data);

					return $this->data;
				}
				else if ($new_session_userdata = $this->session_create($userdata, false))
				{
					// Removing guest sessions from this IP
					DB()->query("
						DELETE FROM ". BB_SESSIONS ."
						WHERE session_ip = '". USER_IP ."'
							AND session_user_id = ". GUEST_UID ."
					");

					return $new_session_userdata;
				}
				else
				{
					trigger_error("Could not start session : login", E_USER_ERROR);
				}
			}
		}

		return array();
	}

	/**
	*  Initialize sessiondata stored in cookies
	*/
	function get_sessiondata ()
	{
		$sd_resv = !empty($_COOKIE[COOKIE_DATA]) ? @unserialize($_COOKIE[COOKIE_DATA]) : array();

		// autologin_id
		if (!empty($sd_resv['uk']) && verify_id($sd_resv['uk'], LOGIN_KEY_LENGTH))
		{
			$this->sessiondata['uk'] = $sd_resv['uk'];
		}
		// user_id
		if (!empty($sd_resv['uid']))
		{
			$this->sessiondata['uid'] = intval($sd_resv['uid']);
		}
		// sid
		if (!empty($sd_resv['sid']) && verify_id($sd_resv['sid'], SID_LENGTH))
		{
			$this->sessiondata['sid'] = $sd_resv['sid'];
		}
	}

	/**
	*  Store sessiondata in cookies
	*/
	function set_session_cookies ($user_id)
	{
		global $bb_cfg;

		if ($user_id == GUEST_UID)
		{
			$delete_cookies = array(
				COOKIE_DATA,
				COOKIE_DBG,
				'torhelp',
				'explain',
				'sql_log',
				'sql_log_full',
			);

			foreach ($delete_cookies as $cookie)
			{
				if (isset($_COOKIE[$cookie]))
				{
					bb_setcookie($cookie, '', COOKIE_EXPIRED);
				}
			}
		}
		else
		{
			$c_sdata_resv = !empty($_COOKIE[COOKIE_DATA]) ? $_COOKIE[COOKIE_DATA] : null;
			$c_sdata_curr = ($this->sessiondata) ? serialize($this->sessiondata) : '';

			if ($c_sdata_curr !== $c_sdata_resv)
			{
				bb_setcookie(COOKIE_DATA, $c_sdata_curr, COOKIE_PERSIST, true);
			}
			if (isset($bb_cfg['dbg_users'][$this->data['user_id']]) && !DBG_USER)
			{
				bb_setcookie(COOKIE_DBG, 1, COOKIE_SESSION);
			}

			// Unset sql debug cookies
			if (!SQL_DEBUG || !DBG_USER)
			{
				foreach (array('explain', 'sql_log', 'sql_log_full') as $cookie)
				{
					if (isset($_COOKIE[$cookie]))
					{
						bb_setcookie($cookie, '', COOKIE_EXPIRED);
					}
				}
			}
		}
	}

	/**
	*  Verify autologin_id
	*/
	function verify_autologin_id ($userdata, $expire_check = false, $create_new = true)
	{
		global $bb_cfg;

		$autologin_id = $userdata['autologin_id'];

		if ($expire_check)
		{
			if ($create_new && !$autologin_id)
			{
				return $this->create_autologin_id($userdata);
			}
			else if ($autologin_id && $userdata['user_session_time'] && $bb_cfg['max_autologin_time'])
			{
				if (TIMENOW - $userdata['user_session_time'] > $bb_cfg['max_autologin_time']*86400)
				{
					return $this->create_autologin_id($userdata, $create_new);
				}
			}
		}

		return verify_id($autologin_id, LOGIN_KEY_LENGTH);
	}

	/**
	*  Create autologin_id
	*/
	function create_autologin_id ($userdata, $create_new = true)
	{
		$autologin_id = ($create_new) ? make_rand_str(LOGIN_KEY_LENGTH) : '';

		DB()->query("
			UPDATE ". BB_USERS ." SET
				autologin_id = '$autologin_id'
			WHERE user_id = ". (int) $userdata['user_id'] ."
			LIMIT 1
		");

		return $autologin_id;
	}

	/**
	 *  Set shortcuts
	 */
	function set_shortcuts ()
	{
		$this->id            =& $this->data['user_id'];
		$this->active        =& $this->data['user_active'];
		$this->name          =& $this->data['username'];
		$this->lastvisit     =& $this->data['user_lastvisit'];
		$this->regdate       =& $this->data['user_regdate'];
		$this->level         =& $this->data['user_level'];
		$this->opt           =& $this->data['user_opt'];

		$this->ip            =  CLIENT_IP;
	}

	/**
	*  Initialise user settings
	*/
	function init_userprefs ()
	{
		global $bb_cfg, $theme, $source_lang, $DeltaTime;

		if (defined('LANG_DIR')) return;  // prevent multiple calling

		define('DEFAULT_LANG_DIR', LANG_ROOT_DIR . $bb_cfg['default_lang'] .'/');
		define('ENGLISH_LANG_DIR', LANG_ROOT_DIR .'en/');

		if ($this->data['user_id'] != GUEST_UID)
		{
			if ($this->data['user_lang'] && $this->data['user_lang'] != $bb_cfg['default_lang'])
			{
				$bb_cfg['default_lang'] = basename($this->data['user_lang']);
				define('LANG_DIR', LANG_ROOT_DIR . $bb_cfg['default_lang'] .'/');
			}

			if (isset($this->data['user_timezone']))
			{
				$bb_cfg['board_timezone'] = $this->data['user_timezone'];
			}
		}

		$this->data['user_lang']       = $bb_cfg['default_lang'];
		$this->data['user_timezone']   = $bb_cfg['board_timezone'];

		if (!defined('LANG_DIR')) define('LANG_DIR', DEFAULT_LANG_DIR);

		/** Temporary place source language to the global */
		$lang = array();
		require(ENGLISH_LANG_DIR .'main.php');
		$source_lang = $lang;
		unset($lang);

		/** Place user language to the global */
		global $lang;
		require(LANG_DIR .'main.php');
		setlocale(LC_ALL, isset($bb_cfg['lang'][$this->data['user_lang']]['locale']) ? $bb_cfg['lang'][$this->data['user_lang']]['locale'] : 'en_US.UTF-8');
		$lang += $source_lang;

		$theme = setup_style();
		$DeltaTime = new Date_Delta();

		// Handle marking posts read
		if (!IS_GUEST && !empty($_COOKIE[COOKIE_MARK]))
		{
			$this->mark_read($_COOKIE[COOKIE_MARK]);
		}

		$this->load_opt_js();
		$this->enqueue_ads();
	}

	/**
	*  Mark read
	*/
	function mark_read ($type)
	{
		if ($type === 'all_forums')
		{
			// Update session time
			DB()->query("
				UPDATE ". BB_SESSIONS ." SET
					session_time = ". TIMENOW ."
				WHERE session_id = '{$this->data['session_id']}'
				LIMIT 1
			");

			// Update userdata
			$this->data['session_time']   = TIMENOW;
			$this->data['user_lastvisit'] = TIMENOW;

			// Update lastvisit
			db_update_userdata($this->data, array(
				'user_session_time' => $this->data['session_time'],
				'user_lastvisit'    => $this->data['user_lastvisit'],
			));

			// Delete cookies
			bb_setcookie(COOKIE_TOPIC, '');
			bb_setcookie(COOKIE_FORUM, '');
			bb_setcookie(COOKIE_MARK,  '');
		}
	}

	/**
	*  Load misc options
	*/
	function load_opt_js ()
	{
		if (IS_GUEST)
		{
			$this->opt_js = array_merge($this->opt_js, $this->opt_js_guest);
		}
		else if (!empty($_COOKIE['opt_js']))
		{
			$opt_js = Zend\Json\Json::decode($_COOKIE['opt_js'], Zend\Json\Json::TYPE_ARRAY);

			if (is_array($opt_js))
			{
				$this->opt_js = array_merge($this->opt_js, $opt_js);
			}
		}
	}

	/**
	*  Get not auth forums
	*/
	function get_not_auth_forums ($auth_type)
	{
		global $datastore;

		if (IS_ADMIN) return '';

		if (!$forums = $datastore->get('cat_forums'))
		{
			$datastore->update('cat_forums');
			$forums = $datastore->get('cat_forums');
		}

		if ($auth_type == AUTH_VIEW)
		{
			if (IS_GUEST)
			{
				return $forums['not_auth_forums']['guest_view'];
			}
		}
		if ($auth_type == AUTH_READ)
		{
			if (IS_GUEST)
			{
				return $forums['not_auth_forums']['guest_read'];
			}
		}

		$auth_field_match = array(
			AUTH_VIEW       => 'auth_view',
			AUTH_READ       => 'auth_read',
			AUTH_POST       => 'auth_post',
			AUTH_REPLY      => 'auth_reply',
			AUTH_EDIT       => 'auth_edit',
			AUTH_DELETE     => 'auth_delete',
			AUTH_STICKY     => 'auth_sticky',
			AUTH_ANNOUNCE   => 'auth_announce',
			AUTH_VOTE       => 'auth_vote',
			AUTH_POLLCREATE => 'auth_pollcreate',
			AUTH_ATTACH     => 'auth_attachments',
			AUTH_DOWNLOAD   => 'auth_download',
		);

		$not_auth_forums = array();
		$auth_field = $auth_field_match[$auth_type];
		$is_auth_ary = auth($auth_type, AUTH_LIST_ALL, $this->data);

		foreach ($is_auth_ary as $forum_id => $is_auth)
		{
			if (!$is_auth[$auth_field])
			{
				$not_auth_forums[] = $forum_id;
			}
		}

		return join(',', $not_auth_forums);
	}

	/**
	*  Get excluded forums
	*/
	function get_excluded_forums ($auth_type, $return_as = 'csv')
	{
		$excluded = array();

		if ($not_auth = $this->get_not_auth_forums($auth_type))
		{
			$excluded[] = $not_auth;
		}

		if (bf($this->opt, 'user_opt', 'user_porn_forums'))
		{
			global $datastore;

			if (!$forums = $datastore->get('cat_forums'))
			{
				$datastore->update('cat_forums');
				$forums = $datastore->get('cat_forums');
			}

			if (isset($forums['forum']))
			{
				foreach ($forums['forum'] as $key => $row)
				{
					if ($row['allow_porno_topic']) $excluded[] = $row['forum_id'];
				}
			}
		}

		switch ($return_as)
		{
			case   'csv': return join(',', $excluded);
			case 'array': return $excluded;
			case  'flip': return array_flip(explode(',', $excluded));
		}
	}

	/**
	*  Enqueue ads
	*/
	function enqueue_ads ()
	{
		global $datastore, $bb_cfg;

		if ($bb_cfg['show_ads'] && !bf($this->opt, 'user_opt', 'user_hide_ads') && !defined('IN_ADMIN') && !defined('IN_AJAX'))
		{
			$datastore->enqueue('ads');
			$this->show_ads = true;
		}
	}
}

//
// userdata cache
//
function ignore_cached_userdata ()
{
	return (defined('IN_PM')) ? true : false;
}

function cache_get_userdata ($id)
{
	if (ignore_cached_userdata()) return false;

	return CACHE('session_cache')->get($id);
}

function cache_set_userdata ($userdata, $force = false)
{
	global $bb_cfg;

	if (!$userdata || (ignore_cached_userdata() && !$force)) return false;

	$id = ($userdata['user_id'] == GUEST_UID) ? $userdata['session_ip'] : $userdata['session_id'];
	return CACHE('session_cache')->set($id, $userdata, $bb_cfg['session_update_intrv']);
}

function cache_rm_userdata ($userdata)
{
	if (!$userdata) return false;

	$id = ($userdata['user_id'] == GUEST_UID) ? $userdata['session_ip'] : $userdata['session_id'];
	return CACHE('session_cache')->rm($id);
}

// $user_id - array(id1,id2,..) or (string) id
function cache_rm_user_sessions ($user_id)
{
	$user_id = get_id_csv($user_id);

	$rowset = DB()->fetch_rowset("
		SELECT session_id FROM ". BB_SESSIONS ." WHERE session_user_id IN($user_id)
	");

	foreach ($rowset as $row)
	{
		CACHE('session_cache')->rm($row['session_id']);
	}
}

function cache_update_userdata ($userdata)
{
	return cache_set_userdata($userdata, true);
}

function db_update_userdata ($userdata, $sql_ary, $data_already_escaped = true)
{
	if (!$userdata) return false;

	$sql_args = DB()->build_array('UPDATE', $sql_ary, $data_already_escaped);
	DB()->query("UPDATE ". BB_USERS ." SET $sql_args WHERE user_id = {$userdata['user_id']}");

	if (DB()->affected_rows())
	{
		cache_rm_userdata($userdata);
	}
}

// $user_id - array(id1,id2,..) or (string) id
function delete_user_sessions ($user_id)
{
	cache_rm_user_sessions($user_id);

	$user_id = get_id_csv($user_id);
	DB()->query("DELETE FROM ". BB_SESSIONS ." WHERE session_user_id IN($user_id)");
}

// deprecated
function session_begin ($userdata, $page_id = 0, $enable_autologin = false, $auto_created = false)
{
	global $user;

	$user->session_create($userdata, $auto_created);

	return $user->data;
}

// deprecated
function session_pagestart ($user_ip = USER_IP, $page_id = 0, $req_login = false)
{
	global $user;

	$user->session_start(array('req_login' => $req_login));

	return $user->data;
}