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<?php

class MySessionHandler implements SessionHandlerInterface {

    private static $instance = null;

    private static $sessionTab = 0;

    private static $_sess_db = null;

    private static $db_user = null;

    private static $db_pass = null;

    private static $db_name = null;

    private static $db_host = null;

    public static function getInstance($set_tab = null, $mysqlConfig = null){

        if (is_null(self::$instance)){

            self::$instance = new self();

        }

        if ($set_tab && !is_null($set_tab) && ($set_tab > 0 || $set_tab == 'login')) {

            self::setSessionTab($set_tab);

        } else {

            self::setSessionTab();

        }

        // store mysqli configuration

        if (!is_null($mysqlConfig)) {

            if (isset($mysqlConfig['db_user']) && !empty($mysqlConfig['db_user'])) {

                self::$db_user = $mysqlConfig['db_user'];

            } else {

                throw new \Exception("MySessionHandler:: - db_user not set in configuration");

            }

            if (isset($mysqlConfig['db_pass']) && !empty($mysqlConfig['db_pass'])) {

                self::$db_pass = $mysqlConfig['db_pass'];

            } else {

                throw new \Exception("MySessionHandler:: - db_pass not set in configuration");

            }

            if (isset($mysqlConfig['db_name']) && !empty($mysqlConfig['db_name'])) {

                self::$db_name = $mysqlConfig['db_name'];

            } else {

                throw new \Exception("MySessionHandler:: - db_name not set in configuration");

            }

            if (isset($mysqlConfig['db_host']) && !empty($mysqlConfig['db_host'])) {

                self::$db_host = $mysqlConfig['db_host'];

            } else {

                throw new \Exception("MySessionHandler:: - db_host not set in configuration");

            }

        }

        return self::$instance;

    }

    public static function getDBSessionId(){

        return self::$_sess_db;

    }

    public static function getSessionTab(){

        return self::$sessionTab;

    }

    public static function setSessionTab($tab = 0){

        self::$sessionTab = $tab ? (int)$tab : (int)rand(1, pow(10, 9) - 1);

    }

    public function open($savePath = null, $sessionName = null)

    {

        if(is_null(self::$sessionTab)){

            self::setSessionTab();

        }

        self::$_sess_db = mysqli_connect(self::$db_host, self::$db_user, self::$db_pass, self::$db_name);

        if (mysqli_connect_errno())

        {

            error_log("Failed to connect to MySQL: " . mysqli_connect_error());

            return false;

        }

        return true;

    }

    public function close()

    {

       return mysqli_close(self::$_sess_db);

    }

    public function read($id)

    {

        $id = mysqli_real_escape_string(self::$_sess_db, $id);

        $sql = "SELECT data

                FROM sessions

                WHERE id = '$id' and tab = '" . self::getSessionTab() . "'";

        $_SESSION = [];

        if ($result = mysqli_query(self::$_sess_db, $sql))

        {

            if (mysqli_num_rows($result))

            {

                $record = mysqli_fetch_assoc($result);

                $decrypted = Cryptor::Decrypt($record['data']);

                $_SESSION = json_decode($decrypted, true);

            }

        } else {

            error_log("MySQL Read Session Error: " . mysqli_error(self::$_sess_db));

        }

        if (self::getSessionTab() != 0) {

            $sql = "SELECT data

                    FROM sessions

                    WHERE id = '$id' and tab = '0'";

            if ($result = mysqli_query(self::$_sess_db, $sql))

            {

                if (mysqli_num_rows($result))

                {

                    $record = mysqli_fetch_assoc($result);

                    $decrypted = Cryptor::Decrypt($record['data']);

                    $temp = json_decode($decrypted, true);

                    $_SESSION = array_merge($_SESSION, $temp);

                }

            } else {

                error_log("MySQL Login Read Session Error: " . mysqli_error(self::$_sess_db)); // bugbug

            }

        }

        if (isset($_SESSION) && !empty($_SESSION) && $_SESSION != null) {

            return session_encode();

        }

        return '';

    }

    public function write($id, $data)

    {

        return true; // see commit()

    }

    public static function commit($id)

    {

        $id = mysqli_real_escape_string(self::$_sess_db, $id);

        $access = mysqli_real_escape_string(self::$_sess_db, time());

        $encrypted = Cryptor::Encrypt(json_encode($_SESSION));

        $userId = (empty($_SESSION['sessData']['userID']) ? 'NULL' : $_SESSION['sessData']['userID']);

        $sql = "REPLACE

                INTO sessions

                VALUES ('$id', '" . self::getSessionTab() . "', '$access', '$encrypted', $userId)";

        if (!($result = mysqli_query(self::$_sess_db, $sql))) {

            error_log("MySQL Write Session Error: " . mysqli_error(self::$_sess_db));

        }

        return $result;

    }

    public function destroy($id)

    {

        $id = mysqli_real_escape_string(self::$_sess_db, $id);

        $sql = "DELETE

                FROM sessions

                WHERE id = '$id' and tab = '" . self::getSessionTab() . "'";

        if (!($result = mysqli_query(self::$_sess_db, $sql))) {

            error_log("MySQL Destroy Session: " . mysqli_error(self::$_sess_db));

        }

        return $result;

    }

    public function gc($maxlifetime)

    {

        $old = mysqli_real_escape_string(self::$_sess_db, time() - $maxlifetime);

    $sql = "DELETE

            FROM sessions

            WHERE access < '$old'";

        if (!($result = mysqli_query(self::$_sess_db, $sql))) {

            error_log("MySQL Session GC Error: " . mysqli_error(self::$_sess_db));

        }

        return $result;

    }

}