<?php

class Auth extends PhpObject
{
	const ALGO = PASSWORD_DEFAULT;
	const COST = 12;
	const TOKEN_SEP = '|';
	const USER_COOKIE_PASS = 'checksum';
	const DEFAULT_PASS = 'planeum01';
	
	/**
	 * Database Connection
	 * @var MySqlManager
	 */
	private $oMySql;
	
	private $iUserId;
	
	private $sApiKey;
	
	public function __construct($oMySql, $sApiKey='')
	{
		$this->oMySql = $oMySql;
		$this->setUserId(0);
		$this->sApiKey = $sApiKey;
		$this->autoLogIn();
	}
	
	private function setUserId($iUserId)
	{
		$this->iUserId = $iUserId;
	}
	
	public function getUserId()
	{
		return $this->iUserId;
	}
	
	public function isLoggedIn()
	{
		return ($this->getUserId() > 0);
	}
	
	public function logMeIn($sToken)
	{
		$sDesc = '';
		if($sToken!='')
		{
			$sLoginToken = addslashes(strstr($sToken, self::TOKEN_SEP, true));
			$sPassToken = substr(strstr($sToken, self::TOKEN_SEP), strlen(self::TOKEN_SEP));
			if($sLoginToken!='' && $sPassToken!='')
			{
				$asEmpl = $this->oMySql->selectRow("EMPLOYEE", array('MD5(EMAIL)'=>$sLoginToken));
				if(!empty($asEmpl))
				{
					if(self::CheckPassword($sPassToken, $asEmpl['PASS']))
					{
						$this->setUserId($asEmpl['ID']);
						$this->resetAuthCookie($this->getUserId());
					}
					else $sDesc = 'mot de passe incorrect';
				}
				else $sDesc = 'email inconnu';
			}
			else $sDesc = 'token corrompu';
		}
		else $sDesc = 'Aucune information reçue par le serveur';
		
		return CvTheque::getJsonResult($this->isLoggedIn(), $sDesc);
	}
	
	public function autoLogIn()
	{
		if(isset($_COOKIE[self::USER_COOKIE_PASS]))
		{
			$sCookie = $_COOKIE[self::USER_COOKIE_PASS];
			$iUserId = addslashes(strstr($sCookie, self::TOKEN_SEP, true));
			$sCookie = substr(strstr($sCookie, self::TOKEN_SEP), strlen(self::TOKEN_SEP));
		
			$asEmpl = $this->oMySql->selectRow("EMPLOYEE", array('ID'=>$iUserId));
			if(!empty($asEmpl))
			{
				if($sCookie==$asEmpl['COOKIE'])
				{
					$this->setUserId($asEmpl['ID']);
		
					//Reset pass once a day
					if(mb_substr($asEmpl['LED'], 0, 10) != date('Y-m-d')) $this->resetAuthCookie($this->getUserId());
				}
				else $this->addError('token corrompu pour le user '.$asEmpl['ID']);
			}
			else $this->addError('Utilisateur '.$iUserId.' inconnu');
		}
	}
	
	//TODO integrate with logMeIn()
	public function checkApiKey($sApiKey)
	{
		return ($this->sApiKey!='' && $sApiKey==$this->sApiKey);
	}
	
	public function resetPass($iUserId=0)
	{
		if($iUserId>0) $asUsers = array($iUserId);
		else $asUsers = $this->oMySql->selectRows(array('select'=>array('ID'), 'from'=>'EMPLOYEE'));
		
		foreach($asUsers as $iUserId)
		{
			$sToken = $this->HashPassword(self::getLoginToken(self::DEFAULT_PASS));
			$this->oMySql->updateRow('EMPLOYEE', array('ID'=>$iUserId), array('pass'=>$sToken));
		}
	}
	
	private static function getLoginToken($sPass)
	{
		//Add Server Name
		$sServerName = array_key_exists('SERVER_NAME', $_SERVER)?$_SERVER['SERVER_NAME']:$_SERVER['PWD'];
		$sAppPath = 'http://'.str_replace('http://', '', $sServerName.dirname($_SERVER['SCRIPT_NAME']));
		$_GET['serv_name'] = $sAppPath.(mb_substr($sAppPath, -1)!='/'?'/':'');
		
		return md5($sPass.$_GET['serv_name']);
	}
	
	private function resetAuthCookie($iUserId)
	{
		$sNewPass = self::getAuthCookie($iUserId);
		$iTimeLimit = time()+60*60*24*30;
		//mysqli_query($con, "UPDATE EMPLOYEE SET COOKIE = '".addslashes($sNewPass)."' WHERE ID = ".$iUserId);
		$this->oMySql->updateRow("EMPLOYEE", array("ID"=>$iUserId), array("COOKIE"=>$sNewPass));
		setcookie(self::USER_COOKIE_PASS, $iUserId.self::TOKEN_SEP.$sNewPass, $iTimeLimit);
	}
	
	private static function getAuthCookie()
	{
		return self::HashPassword
		(
			$_SERVER['HTTP_USER_AGENT'].
			$_SERVER['REMOTE_ADDR'].
			$_SERVER['REQUEST_TIME'].
			mb_strstr(microtime(), ' ', true).
			$_SERVER['SERVER_SIGNATURE'].
			$_SERVER['SERVER_ADMIN']
		);
	}
	
	private static function HashPassword($sPass)
	{
		return password_hash($sPass, self::ALGO, array('cost'=>self::COST));
	}

	private static function CheckPassword($sPass, $sHash)
	{
		return password_verify($sPass, $sHash);
	}
}

?>