<?php

/**
 * This is one giant class containing various functions that will generate
 * required config files, daemon instances and more, mostly through the Taskmanager.
 * Most function *should* only actually do something if it is required to do so.
 * eg. a "launchSomething" function should only launch something if it isn't already
 * running. Checking if something is running can happen in that very function, or in
 * a task that the function is calling.
 */
class Trigger
{

	/**
	 * Compile iPXE pxelinux menu. Needs to be done whenever the server's IP
	 * address changes.
	 * 
	 * @return boolean|string false if launching task failed, task-id otherwise
	 */
	public static function ipxe()
	{
		$data = Property::getBootMenu();
		$data['ipaddress'] = Property::getServerIp();
		$task = Taskmanager::submit('CompileIPxe', $data);
		if (!isset($task['id']))
			return false;
		return $task['id'];
	}

	/**
	 * Try to automatically determine the primary IP address of the server.
	 * This only works if the server has either one public IPv4 address (and potentially
	 * one or more non-public addresses), or one private address.
	 * 
	 * @return boolean true if current configured IP address is still valid, or if a new address could
	 * successfully be determined, false otherwise
	 */
	public static function autoUpdateServerIp()
	{
		$task = Taskmanager::submit('LocalAddressesList');
		if ($task === false)
			return false;
		$task = Taskmanager::waitComplete($task, 10000);
		if (!isset($task['data']['addresses']) || empty($task['data']['addresses']))
			return false;

		$serverIp = Property::getServerIp();
		$publicCandidate = 'none';
		$privateCandidate = 'none';
		foreach ($task['data']['addresses'] as $addr) {
			if ($addr['ip'] === $serverIp)
				return true;
			if (substr($addr['ip'], 0, 4) === '127.')
				continue;
			if (Util::isPublicIpv4($addr['ip'])) {
				if ($publicCandidate === 'none')
					$publicCandidate = $addr['ip'];
				else
					$publicCandidate = 'many';
			} else {
				if ($privateCandidate === 'none')
					$privateCandidate = $addr['ip'];
				else
					$privateCandidate = 'many';
			}
		}
		if ($publicCandidate !== 'none' && $publicCandidate !== 'many') {
			Property::setServerIp($publicCandidate);
			return true;
		}
		if ($privateCandidate !== 'none' && $privateCandidate !== 'many') {
			Property::setServerIp($privateCandidate);
			return true;
		}
		return false;
	}

	/**
	 * Launch all ldadp instances that need to be running.
	 *
	 * @param string $parent if not NULL, this will be the parent task of the launch-task
	 * @return boolean|string false on error, id of task otherwise
	 */
	public static function ldadp($parent = NULL)
	{
		$res = Database::simpleQuery("SELECT moduleid, configtgz.filepath FROM configtgz_module"
				. " INNER JOIN configtgz_x_module USING (moduleid)"
				. " INNER JOIN configtgz USING (configid)"
				. " WHERE moduletype = 'AD_AUTH'");
		// TODO: Multiconfig support
		$id = array();
		while ($row = $res->fetch(PDO::FETCH_ASSOC)) {
			if (readlink('/srv/openslx/www/boot/default/config.tgz') === $row['filepath']) {
				$id[] = (int) $row['moduleid'];
				break;
			}
		}
		$task = Taskmanager::submit('LdadpLauncher', array(
				'ids' => $id,
				'parentTask' => $parent,
				'failOnParentFail' => false
		));
		if (!isset($task['id']))
			return false;
		return $task['id'];
	}

	/**
	 * To be called if the server ip changes, as it's embedded in the AD module configs.
	 * This will then recreate all AD tgz modules.
	 */
	public static function rebuildAdModules()
	{
		$task = Taskmanager::submit('LdadpLauncher', array('ids' => array())); // Stop all running instances
		$ads = ConfigModule::getAdConfigs();
		if (empty($ads))
			return;

		$parent = isset($task['id']) ? $task['id'] : NULL;
		foreach ($ads as $ad) {
			$ad['parentTask'] = $parent;
			$ad['failOnParentFail'] = false;
			$task = Taskmanager::submit('CreateAdConfig', $ad);
			if (isset($task['id']))
				$parent = $task['id'];
		}
		if (Taskmanager::waitComplete($parent, 2000) === false) {
			EventLog::warning('Rebuilding LDAP-AD-Proxy config failed. AD Auth might not work properly.');
			sleep(1);
		}
		Trigger::ldadp();
	}

	/**
	 * Mount the VM store into the server.
	 *
	 * @return array task status of mount procedure, or false on error
	 */
	public static function mount()
	{
		$vmstore = Property::getVmStoreConfig();
		if (!is_array($vmstore))
			return false;
		$storetype = $vmstore['storetype'];
		if ($storetype === 'nfs')
			$addr = $vmstore['nfsaddr'];
		if ($storetype === 'cifs')
			$addr = $vmstore['cifsaddr'];
		if ($storetype === 'internal')
			$addr = 'null';
		return Taskmanager::submit('MountVmStore', array(
				'address' => $addr,
				'type' => 'images',
				'username' => $vmstore['cifsuser'],
				'password' => $vmstore['cifspasswd']
		));
	}

	/**
	 * Check and process all callbacks
	 */
	public static function checkCallbacks()
	{
		$res = Database::simpleQuery("SELECT taskid, cbfunction FROM callback");
		while ($row = $res->fetch(PDO::FETCH_ASSOC)) {
			$status = Taskmanager::status($row['taskid']);
			if (Taskmanager::isFailed($status) || Taskmanager::isFinished($status))
				Database::exec("DELETE FROM callback WHERE taskid = :task AND cbfunction = :cb LIMIT 1", array('task' => $row['taskid'], 'cb' => $row['cbfunction']));
			if (Taskmanager::isFinished($status)) {
				$func = array('TaskmanagerCallback', preg_replace('/\W/', '', $row['cbfunction']));
				if (!call_user_func_array('method_exists', $func)) {
					Eventlog::warning("Callback {$row['cbfunction']} doesn't exist.");
				} else {
					call_user_func($func, $status);
				}
			}
		}
	}

	private static function triggerDaemons($action, $parent, &$taskids)
	{
		$task = Taskmanager::submit('SyncdaemonLauncher', array(
				'operation' => $action,
				'parentTask' => $parent,
				'failOnParentFail' => false
		));
		if (isset($task['id'])) {
			$taskids['syncid'] = $task['id'];
			$parent = $task['id'];
		}
		$task = Taskmanager::submit('DozmodLauncher', array(
				'operation' => $action,
				'parentTask' => $parent,
				'failOnParentFail' => false
		));
		if (isset($task['id'])) {
			$taskids['dmsdid'] = $task['id'];
			$parent = $task['id'];
		}
		return $parent;
	}

	public static function stopDaemons($parent, &$taskids)
	{
		$parent = self::triggerDaemons('stop', $parent, $taskids);
		$task = Taskmanager::submit('LdadpLauncher', array(
				'ids' => array(),
				'parentTask' => $parent,
				'failOnParentFail' => false
		));
		if (isset($task['id'])) {
			$taskids['ldadpid'] = $task['id'];
			$parent = $task['id'];
		}
		return $parent;
	}

	public static function startDaemons($parent, &$taskids)
	{
		$parent = self::triggerDaemons('start', $parent, $taskids);
		$taskid = self::ldadp($parent);
		if ($taskid !== false) {
			$taskids['ldadpid'] = $taskid;
			$parent = $taskid;
		}
		return $parent;
	}

}