<?php

class mfLoginController extends mfBaseController
{
    protected function init($request)
    {
        $this->layout()->setTemplate("mfLogin/Index");
        if ($request['mfLoginTemplate']) {
            $this->layout()->setTemplate($request['mfLoginTemplate']);
        }
        /*if($request['mfLoginGet']) {
            $_SESSION['mfLoginGet']=$request['mfLoginGet'];
        }*/
        if ($request['mfLoginUrl']) {
            $_SESSION['mfLoginUrl'] = $request['mfLoginUrl'];
        }


        $this->logout();
    }


    protected function indexAction()
    {
        if ($_SESSION[MFAPPNAME . "_loginfailed"]) {
            $this->layout()->set("LayoutError", "Login fehlgeschlagen.");
        }
        unset($_SESSION[MFAPPNAME . "_loginfailed"]);
    }

    protected function loginAction($request)
    {
        #Check if 2FA Code existiert
        if (!$request['TwofactorCode'] || !is_int((int)$request['TwofactorCode'])) {
            $code2fa = "unset";

        } else {
            $code2fa = $request['TwofactorCode'];
        }

        #Check ob Angemeldet bleiben aktiv ist
        if (isset($request['Remember']) && $request['Remember'] === "true") {
            $remember = true;
        } else {
            $remember = false;
        }


        #performLogin um 2FA Code und Remember erweitert
        $performLogin = $this->performLogin($request['Username'], $request['Password'], $code2fa, $remember);

        #performLogin um mehrere Stati erweitert
        if ($performLogin === true) {

        } elseif ($performLogin == "2fa") {
            $this->layout()->setTemplate("mfLogin/Index");
            $this->layout()->set("request", $request);
            $this->layout()->set("requesttype", $performLogin);
            return;
        } elseif ($performLogin == "false2fa") {
            $this->layout()->setTemplate("mfLogin/Index");
            $this->layout()->setFlash("Verifizierungscode falsch oder abgelaufen", "error");
            $this->layout()->set("request", $request);
            $this->layout()->set("requesttype", $performLogin);
            return;
        } else {
            $_SESSION[MFAPPNAME . "_loginfailed"] = true;
            $this->layout()->setTemplate("mfLogin/Index");
            $this->layout()->set("requesttype", "falselogin");
            return;
        }
        //$get=$_SESSION['mfLoginGet'];
        $url = $_SESSION['mfLoginUrl'];
        //unset($_SESSION['mfLoginGet']);
        unset($_SESSION['mfLoginUrl']);
        /*
        $mod=$get['action'];
        if(preg_match('/([^_]+)_(.+)/',$action,$m)) {
          $mod=$m[1];
          $action=$m[2];
        }
        unset($get['action']);

            self::redirect($mod,$action,$get);
        */

        #Header wird nur neu geladen wenn Login true ist
        header("Location: $url");
    }


    /*
     * Internal functions
     */
    public function logout()
    {
        if (!defined("MFAPPNAME")) define("MFAPPNAME", "mvcfronk");
        if (!defined("MFUSERTABLE")) define("MFUSERTABLE", "mfWorker");
        //session_name(MFAPPNAME."_session");
        //session_start();
        #Delete Token (DB und Cookie)
        UserToken::deleteToken();
        unset($_SESSION[MFAPPNAME . '_username']);
        unset($_SESSION[MFAPPNAME . '_ip']);
    }

    public static function staticLogout()
    {
        if (!defined("MFAPPNAME")) define("MFAPPNAME", "mvcfronk");
        if (!defined("MFUSERTABLE")) define("MFUSERTABLE", "mfWorker");
        //session_name(MFAPPNAME."_session");
        //session_start();
        #Delete Token (DB und Cookie)
        UserToken::deleteToken();
        unset($_SESSION[MFAPPNAME . '_username']);
        unset($_SESSION[MFAPPNAME . '_ip']);
    }

    public static function isLoggedIn()
    {
        $db = FronkDB::singleton();
        if (!defined("MFAPPNAME")) define("MFAPPNAME", "mvcfronk");
        if (!defined("MFUSERTABLE")) define("MFUSERTABLE", "mfWorker");

        //session_name(MFAPPNAME."_session");
        //session_start();
        #Check if Token Cookie und DB Eintrag existiert
        UserToken::checkToken();


        if (isset($_SESSION[MFAPPNAME . '_username']) && $_SESSION[MFAPPNAME . '_username'] && $_SESSION[MFAPPNAME . '_ip']) {
            $username = $_SESSION[MFAPPNAME . '_username'];
            $ip = $_SERVER['REMOTE_ADDR'];
            $sid = session_id();

            if ($_SESSION[MFAPPNAME . '_ip'] == $ip) {
                // session seems legit, check if user exists and additionally check IP saved in database
                $res = $db->select(MFUSERTABLE, "*", "username='$username' AND ip='$ip' AND sessionid='$sid'");
                if ($db->num_rows($res)) {
                    $user = $db->fetch_object($res);
                    self::initSession($user);
                    return true;
                }
                return false;
            }
        } else {

            return false;
        }
    }

    protected static function initSession($user)
    {
        $_SESSION[MFAPPNAME . '_username'] = $user->username;
        $_SESSION[MFAPPNAME . '_ip'] = $_SERVER['REMOTE_ADDR'];
        unset($_SESSION[MFAPPNAME . "_loginfailed"]);

        $user = mfUser::singleton($user);

        return true;
    }


    protected function performLogin($username, $password, $code2fa, $remember)
    {
        if (!defined("MFAPPNAME")) define("MFAPPNAME", "mvcfronk");
        if (!defined("MFUSERTABLE")) define("MFUSERTABLE", "mfWorker");

        //session_set_cookie_params(0);
        //session_name(MFAPPNAME."_session");
        //session_start();

        if (!is_scalar($username) || !is_scalar($password)) {
            return false;
        }

        $username = $this->db()->escape($username);

        $res = $this->db()->select(MFUSERTABLE, "*", "username='$username'");
        if (!$this->db()->num_rows($res)) {
            sleep(1);
            return false;
        }
        $user = $this->db()->fetch_object($res);
        if ($user->active == 0) return false;
        $hash = $user->password;

        #2FA Variablen
        $twofactor = $user->twofactor;
        $twofactorcode = $user->twofactorcode;
        $twofactortimestamp = $user->twofactortimestamp;

        #Zeitdifferenz des 2FA Codes
        $timeSecond = time() - $twofactortimestamp;

        $userid = $user->id;

        $salt = substr($hash, 0, 16);
        $passhash = $this->generatePasswordHash($password, $salt);
        if ($passhash === $hash) {
            if ($twofactor !== "0") {
                if ($code2fa == "unset") {
                    #2FA Code wird generiert
                    $twoFactor = new UserTwofactor($userid);
                    $twoFactor->sendCode();
                    return "2fa";   #Return für das Einblenden der Verifizierungsmaske
                } elseif ($twofactorcode != $code2fa || $timeSecond > 300) {
                    return "false2fa"; #Return für falscher/abgelaufener 2FA Code
                } elseif ($remember) {
                    #Token generieren in DB und Cookie schreiben
                    UserToken::generateToken($userid);
                }
                $twoFactor = new UserTwofactor($userid);
                $twoFactor->removeCode();
            }
            //session_name(MFAPPNAME."_session");
            //session_start();
            $this->db()->update(MFUSERTABLE, array('ip' => $_SERVER['REMOTE_ADDR'], 'sessionid' => session_id()), "username='$username'");
            $this->log->debug("$username logged in");
            self::initSession($user);
            return true;
        }

        sleep(1);

        return false;
    }

    public static function generatePasswordHash($pass, $salt = NULL)
    {
        if (!$salt) {
            $salt = substr(md5(uniqid(rand(), true)), 0, 16);
        } else {
            $salt = substr($salt, 0, 16);
        }

        return $salt . sha1($salt . $pass);
    }
}