<?php
require_once('MessageManager.class.php');
require_once('Login.class.php');
require_once('Group.class.php');
require_once('User.class.php');

class Auth {
	static $users = array();
	public static function getObj($uid) {
		if (!isset(self::$users[$uid])) {
			global $mm;
			$type = $mm->database()->getStatus($uid)<3;
			switch ($type) {
			case 0: // unactivated user
			case 1: // user
			case 2: $obj = new User($uid); // admin
			case 3: $obj = new Group($uid);
			case 4: $obj = new Auth($uid); // deleted
			}
			self::$users[$uid] = $obj;
		}
		return self::$users[$uid];
	}

	public static function isNameLegal($name) {
		// Current rules:
		// * Not in "$illegal_names"
		// * Does not contain '.'
		// * Fewer than 256 characters
		$illegal_names = array('', 'new', 'index', 'all');
		return true
			&& (!in_array($name, $illegal_names))
			&& (strpos($name,'.')===false)
			&& (strpos($name,'!')===false)
			&& (strlen($name)<256);
	}
	
	protected $db = null;
	protected $uid = false;
	public function __construct($uid) {
		global $mm;
		$this->db = $mm->database();
		$this->uid = $uid;
	}
	public function getUID() {
		return $this->uid;
	}
	
	/**********************************************************************\
	 * The 'auth' table.                                                  *
	\**********************************************************************/
	
	// Row Type ////////////////////////////////////////////////////////////
	/**
	 * @return 0=unverified 1=user 2=admin 3=group 4=deleted
	 */
	protected function getType() {
		$type = $this->db->getStatus($this->uid);
		return $type;
	}
	protected function setType($type) {
		$logged_in_uid = Login::isLoggedIn();
		$logged_in_obj = Auth::getObj($logged_in_uid);
		$is_admin = $logged_in_obj->isAdmin();
		if (!$is_admin) return false;
		return $this->db->setStatus($this->uid, $type);
	}
	public function isUser() {
		$type = $this->getType();
		return ($type===1) || ($type===2);
	}
	public function isAdmin() {
		$type = $this->getType();
		return ($type===2);
	}
	public function isGroup() {
		$type = $this->getType();
		return ($type===3);
	}
	public function setUser($is_user) {
		$is_user = ($is_user?true:false);
		if ($this->isUser() != $is_user) {
			$this->setType($is_user?1:0);
		}
	}
	public function setAdmin($is_admin) {
		$is_admin = ($is_admin?true:false);
		$is_user = $this->isUser();
		$this->setType($is_admin?2:($is_user?1:0));
	}
	public function delete() {
		$this->setType(4);
	}
	
	// Permissions /////////////////////////////////////////////////////////
	public function canRead() {
		$logged_in_uid = Login::isLoggedIn();
		$is_me = ($logged_in_uid === $this->uid);
		
		$logged_in_obj = Auth::getObj($logged_in_uid);
		$is_user = $logged_in_obj->isUser();
		
		return ($is_me || $is_user);
	}
	public function canEdit() {
		$logged_in_uid = Login::isLoggedIn();
		$is_me = ($logged_in_uid === $this->uid);
		
		$logged_in_obj = Auth::getObj($logged_in_uid);
		$is_admin = $logged_in_obj->isAdmin();
		
		return ($is_me || $is_admin);
	}

	// [user|group]name ////////////////////////////////////////////////////
	public function getName() {
		return $this->db->getUsername($this->uid);
	}
	public function setName($new_name) {
		if (!$this->canEdit()) return false;
		if (!self::isNameLegal($new_name)) return false;
		return $this->db->setUsername($this->uid, $new_name);
	}
	
	/**********************************************************************\
	 * The 'users' table.                                                 *
	\**********************************************************************/
	
	public function getConf($setting) {
		if (!$this->canRead()) return false;
		return $this->db->getUserConf($this->uid, $setting);
	}
	public function setConf($setting, $value) {
		if (!$this->canEdit()) return false;
		return $this->db->setUserConf($this->uid, $setting, $value);
	}
	public function getConfArray($setting) {
		$string = $this->getConf($setting);
		return $this->db->valueToArray($string);
	}
	public function setConfArray($setting, $list) {
		$string = $this->db->arrayToValue($list);
		return $this->setConf($setting, $string);
	}
}