<?php

/****************************************************************************
                               _    _                _
 ___ _ __  ___ _ _  __ __ _ __| |_ (_)_ _  __ _   __| |___
/ _ \ '_ \/ -_) ' \/ _/ _` / _| ' \| | ' \/ _` |_/ _` / -_)
\___/ .__/\___|_||_\__\__,_\__|_||_|_|_||_\__, (_)__,_\___|
    |_|                                   |___/

For license information see doc/license.txt   ---   Unicode Reminder メモ

****************************************************************************/

namespace OpencachingDE\Util;

use OpencachingDE\Logging\LoggingInterface;

class Cookie
{
    private $logger;

    private $changed = false;
    private $values = array();
    private $session_initalized = false;

    public function __construct(LoggingInterface $logger)
    {
        $this->logger = $logger;
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            if (isset($_REQUEST['SESSION']) && $_REQUEST['SESSION'] != '') {
                $this->initSession();
            }
        } else {
            if (isset($_COOKIE[$opt['session']['cookiename'] . 'data'])) {
                //get the cookievars-array
                $decoded = base64_decode($_COOKIE[$opt['session']['cookiename'] . 'data']);
                
                if ($decoded !== false) {
                    $this->values = @unserialize($decoded);
                    if (!is_array($this->values)) {
                        $this->values = array();
                    }
                } else {
                    $this->values = array();
                }
            }
        }
    }

    private function initSession()
    {
        if ($this->session_initalized == true) {
            return;
        }

        global $opt;

        session_name('SESSION');
        session_set_cookie_params($opt['session']['expire']['cookie'], $opt['session']['path'], $opt['session']['domain']);
        session_start();

        if ($opt['session']['check_referer']
            && isset($_SERVER['REFERER'])
            && strtolower(substr($_SERVER['REFERER'], 0, strlen($opt['page']['absolute_url']))) != strtolower($opt['page']['absolute_url'])
        ) {
            $this->createNewSession();
        }

        if (isset($_REQUEST['SESSION']) && count($_SESSION) > 0) {
            // comapre and set timestamp
            if (isset($_SESSION['lastcall']) && (abs(time() - $_SESSION['lastcall']) > $opt['session']['expire']['url'])) {
                $this->createNewSession();
            }
            $_SESSION['lastcall'] = time();
        }
        $this->session_initalized = true;
    }

    private function createNewSession()
    {
        session_regenerate_id();
        $locale = isset($_SESSION['locale']) ? $_SESSION['locale'] : '';
        foreach ($_SESSION AS $k => $v) {
            unset($_SESSION[$k]);
        }
        if ($locale != '') {
            $_SESSION['locale'] = $locale;
        }
    }

    private function setSession($name, $value, $default = null)
    {
        if (!isset($_SESSION[$name]) || $_SESSION[$name] != $value) {
            if ($value == $default) {
                if (isset($_SESSION[$name])) {
                    unset($_SESSION[$name]);
                    $this->changed = true;
                }
            } else {
                $this->initSession();
                $_SESSION[$name] = $value;
                $this->changed = true;
            }
        }
    }

    private function setCookie($name, $value, $default = null)
    {
        // Store cookie value in internal array. OcSmarty will call this->header()
        // to actually set the cookie.

        if (!isset($this->values[$name]) || $this->values[$name] != $value) {
            if ($value == $default) {
                if (isset($this->values[$name])) {
                    unset($this->values[$name]);
                    $this->changed = true;
                }
            } else {
                $this->values[$name] = $value;
                $this->changed = true;
            }
        }
    }

    public function set($name, $value, $default = null)
    {
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            $this->setSession($name, $value, $default);
        } else {
            $this->setCookie($name, $value, $default);
        }
    }
    
    public function get($name, $default = '')
    {
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            return isset($_SESSION[$name]) ? $_SESSION[$name] : $default;
        } else {
            return isset($this->values[$name]) ? $this->values[$name] : $default;
        }
    }

    function is_set($name)
    {
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            return isset($_SESSION[$name]);
        } else {
            return isset($this->values[$name]);
        }
    }

    public function un_set($name)
    {
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            if (isset($_SESSION[$name])) {
                unset($_SESSION[$name]);
                $this->changed = true;
            }
        } else {
            if (isset($this->values[$name])) {
                unset($this->values[$name]);
                $this->changed = true;
            }
        }
    }

    public function header()
    {
        global $opt;

        if ($opt['session']['mode'] == SAVE_SESSION) {
            // is autmatically sent
        } else {
            if ($this->changed == true) {
                if (count($this->values) == 0) {
                    $this->logger->notice('Cookie data empty.');
                    setcookie($opt['session']['cookiename'] . 'data', false, time() + 31536000, $opt['session']['path'], $opt['session']['domain'], 0);
                } else {
                    setcookie($opt['session']['cookiename'] . 'data', base64_encode(serialize($this->values)), time() + 31536000, $opt['session']['path'], $opt['session']['domain'], 0);
                }
            }
        }
    }
    
    function debug()
    {
        global $opt;
        if ($opt['session']['mode'] == SAVE_SESSION) {
            print_r($_SESSION);
        } else {
            print_r($this->values);
        }
        exit;
    }

    public function close()
    {
        global $opt;
        if ($opt['session']['mode'] == SAVE_SESSION) {
            if ($this->session_initalized == true) {
                if (count($_SESSION) == 0) {
                    @session_destroy();
                } else {
                    session_write_close();
                }
            }
        }
    }
}