<?php

require_once('./inc/model.class.php');

class SessionModel extends Model
{
	private $userdata = array();
	
	public function __construct(&$db)
	{
		$this->db = $db;
		
		if (isset($_COOKIE[COOKIE_NAME]))
		{
			$result = $this->select(SESSIONS_TABLE, '*', 'session_id=\''.$_COOKIE[COOKIE_NAME].'\' AND expiry_time>=NOW()');
			if (count($result) > 0)
			{
				//update session expiry time in database and in cookie
				if ($result[0]['IP'] != $_SERVER['REMOTE_ADDR'])
				{
					$this->deleteSession();
				}
				else
				{
					$this->updateSession();
					$uid = $result[0]['user_id'];
					
					$result = $this->select(USERS_TABLE, 'user_id, nick, rank', 'user_id=\''.$uid.'\'');
					$this->userdata = $result[0];
				}
			}
			else
			{
				$this->deleteSession();
			}
		}
	}
	
	public function updateSession()
	{
		/*$this->db->query('UPDATE '.SESSIONS_TABLE.' SET expiry_time=(NOW() + INTERVAL 120 MINUTE) WHERE session_id=\''.$_COOKIE[COOKIE_NAME].'\'');
		setcookie(COOKIE_NAME, $_COOKIE[COOKIE_NAME], $_SERVER['REQUEST_TIME']+7200, COOKIE_PATH, COOKIE_DOMAIN, false, true);	*/
		$newid = $this->generateSessionID();
		$this->db->query('UPDATE '.SESSIONS_TABLE.' SET expiry_time=(NOW() + INTERVAL 120 MINUTE), session_id=\''.$newid.'\' WHERE session_id=\''.$_COOKIE[COOKIE_NAME].'\'');
		setcookie(COOKIE_NAME, $newid, $_SERVER['REQUEST_TIME']+7200, COOKIE_PATH, COOKIE_DOMAIN, false, true);
		$_COOKIE[COOKIE_NAME] = $newid;
	}
	
	public function deleteSession()
	{
		setcookie(COOKIE_NAME, '', $_SERVER['REQUEST_TIME']-3600, COOKIE_PATH, COOKIE_DOMAIN, false, true);
		$this->db->query('DELETE FROM '.SESSIONS_TABLE.' WHERE session_id=\''.$_COOKIE[COOKIE_NAME].'\'');
	}
	
	private function generateSessionID()
	{
		$out = $_SERVER['HTTP_USER_AGENT'].$_SERVER['REQUEST_TIME_FLOAT'].$_SERVER['REMOTE_ADDR'].rand(1, 50000);
		return md5($out);
	}
	
	public function registerNewSession($user_id)
	{
		$newID = $this->generateSessionID();
		$query = 'UPDATE '.USERS_INFO_TABLE.'
		SET lastvisit=NOW()
		WHERE user_id=\''.$user_id.'\'';
		
		$this->db->query($query);
		
		$query = 
		'INSERT INTO 
		'.SESSIONS_TABLE.'
		(session_id, user_id, IP, expiry_time)
		 VALUES
		 (\''.$newID.'\', \''.$user_id.'\', \''.$_SERVER['REMOTE_ADDR'].'\', (NOW() + INTERVAL 120 MINUTE) );';
		
		$this->db->query($query);
		
		setcookie(COOKIE_NAME, $newID, $_SERVER['REQUEST_TIME']+7200, COOKIE_PATH, COOKIE_DOMAIN, false, true);
	}
	
	public function tryGetUser($nick, $passwd)
	{
		$result = $this->select(USERS_TABLE, 'user_id, nick', 'nick=\''.$nick.'\' AND password=\''.$passwd.'\'', '', 1);
		
		if (count($result) > 0 )
			return $result[0];
		else
			return array();
	}
	
	public function isLogged()
	{
		if (count($this->userdata) > 0)
			return true;	
		else
			return false;
	}
	
	public function getNick()
	{
		if ($this->isLogged())
			return $this->userdata['nick'];
		else
			return null;
	}
	
	public function getRank()
	{
		if ($this->isLogged())
			return $this->userdata['rank'];
		else
			return null;
	}
	
	public function getID()
	{
		if ($this->isLogged())
			return $this->userdata['user_id'];
		else
			return null;
	}
}

?>