<?php if ( ! defined('ABS_PATH')) exit('ABS_PATH is not loaded. Direct access is not allowed.');

/*
 * Copyright 2014 Osclass
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

    class Session {
        //attributes
        private $session;
        private static $instance;

        public static function newInstance() {
            if(!self::$instance instanceof self) {
                self::$instance = new self;
            }
            return self::$instance;
        }

        public function __construct() {}

        function session_start() {
            $currentCookieParams = session_get_cookie_params();
            if ( defined('COOKIE_DOMAIN') ) {
                $currentCookieParams["domain"] = COOKIE_DOMAIN;
            }
            session_set_cookie_params(
                $currentCookieParams["lifetime"],
                $currentCookieParams["path"],
                $currentCookieParams["domain"],
                $currentCookieParams["secure"],
                true
            );

            if( !isset($_SESSION) ) {
                session_name('osclass');
                if(!$this->_session_start()) {
                    session_id( uniqid() );
                    session_start();
                    session_regenerate_id();
                }
            }

            $this->session = $_SESSION;
            if( $this->_get('messages') == '' ) {
                $this->_set( 'messages', array() );
            }
            if( $this->_get('keepForm') == '' ){
                $this->_set( 'keepForm', array() );
            }
            if( $this->_get('form') == '' ){
                $this->_set( 'form', array() );
            }
        }

        function _session_start()
        {
            $sn = session_name();
            if (isset($_COOKIE[$sn])) {
                $sessid = $_COOKIE[$sn];
            } else if (isset($_GET[$sn])) {
                $sessid = $_GET[$sn];
            } else {
                return session_start();
            }

            if (!preg_match('/^[a-zA-Z0-9,\-]{22,40}$/', $sessid)) {
                return false;
            }
            return session_start();
        }

        function session_destroy() {
            session_destroy();
        }

        function _set($key, $value) {
            $_SESSION[$key] = $value;
            $this->session[$key] = $value;
        }

        function _get($key) {
            if (!isset($this->session[$key])) {
                return '';
            }

            return ($this->session[$key]);
        }

        function _drop($key) {
            unset($_SESSION[$key]);
            unset($this->session[$key]);

        }

        function _setReferer($value) {
            $_SESSION['osc_http_referer'] = $value;
            $this->session['osc_http_referer'] = $value;
            $_SESSION['osc_http_referer_state'] = 0;
            $this->session['osc_http_referer_state'] = 0;
        }

        function _getReferer() {
            if(isset($this->session['osc_http_referer'])) {
                return ($this->session['osc_http_referer']);
            } else {
                return '';
            }
        }

        function _dropReferer() {
            unset($_SESSION['osc_http_referer']);
            unset($this->session['osc_http_referer']);
            unset($_SESSION['osc_http_referer_state']);
            unset($this->session['osc_http_referer_state']);
        }

        function _view() {
            print_r($this->session);
        }

        function _setMessage($key, $value, $type) {
            $messages = $this->_get('messages');
            $messages[$key][] = array('msg' => str_replace(PHP_EOL, "<br />", $value), 'type' => $type);
            $this->_set('messages', $messages);
        }

        function _getMessage($key) {
            $messages = $this->_get('messages');
            if ( isset($messages[$key]) ) {
                return ( $messages[$key] );
            } else {
                return ( '' );
            }
        }

        function _dropMessage($key) {
            $messages = $this->_get('messages');
            unset($messages[$key]);
            $this->_set('messages', $messages);
        }

        function _keepForm($key) {
            $aKeep = $this->_get('keepForm');
            $aKeep[$key] = 1;
            $this->_set('keepForm',$aKeep);
        }

        function _dropKeepForm($key = '') {
            $aKeep = $this->_get('keepForm');
            if($key!='') {
                unset( $aKeep[$key] );
                $this->_set('keepForm', $aKeep);
            } else {
                $this->_set('keepForm', array());
            }
        }

        function _setForm($key, $value) {
            $form = $this->_get('form');
            $form[$key] = $value;
            $this->_set('form', $form);
        }

        function _getForm($key = '') {
            $form = $this->_get('form');
            if($key!='') {
                if ( isset($form[$key]) ) {
                    return ( $form[$key] );
                } else {
                    return ( '' );
                }
            } else {
                return $form;
            }
        }

        function _getKeepForm() {
            return $this->_get('keepForm');
        }

        function _viewMessage() {
            print_r($this->session['messages']);
        }

        function _viewForm() {
            print_r($_SESSION['form']);
        }

        function _viewKeep() {
            print_r($_SESSION['keepForm']);
        }

        function  _clearVariables() {
            $form = $this->_get('form');
            $aKeep = $this->_get('keepForm');
            if( is_array($form) ) {
                foreach($form as $key => $value) {
                    if( !isset($aKeep[$key]) ) {
                        unset($_SESSION['form'][$key]);
                        unset($this->session['form'][$key]);
                    }
                }
            }

            if(isset($this->session['osc_http_referer_state'])) {
                $this->session['osc_http_referer_state']++;
                $_SESSION['osc_http_referer_state']++;
                if((int)($this->session['osc_http_referer_state'])>=2) {
                    $this->_dropReferer();
                }
            }
        }
    }

?>