<?php

class CKFinder_Auth
{
    /** @var array|null */
    protected static $_sessionConfig;

    /** @var string|null */
    protected static $_sessionNameBackup;

    /**
     * @static
     * @return bool
     */
    public static function check()
    {
        $authTypes = array();
        if (Qs_Constant::get('CKFINDER_ON_USEREND_ENABLED')) {
            $authTypes[] = 'user';
        }

        $authTypes[] = 'admin';

        $result = false;
        foreach ($authTypes as $type) {
            if (($result = self::_checkAuth4Type($type))) {
                break;
            }
        }

        self::_restoreSession();

        return $result;
    }

    /**
     * @static
     * @param string $type
     * @return bool
     */
    protected static function _checkAuth4Type($type)
    {
        $authClassName = 'App_' . ucfirst($type) . '_Auth';
        $authAdapterClassName = 'App_' . ucfirst($type) . '_AuthAdapter';

        if (!class_exists($authClassName, true)) {
            return false;
        }

        self::_switchSession($type);

        /** @var $auth Qs_Auth */
        $auth = call_user_func($authClassName . '::getInstance');
        if ($auth && $auth->hasIdentity()) {
            $data = $auth->getIdentity();
            if (!class_exists($authAdapterClassName, true)) {
                return false;
            }

            /** @var $authAdapter Qs_Auth_Adapter_DbTable */
            $authAdapter = new $authAdapterClassName();
            $authAdapter->setIdentity($data);
            $result = $auth->authenticate($authAdapter);
            if ($result->isValid()) {
                return true;
            } else {
                $auth->clearIdentity();
            }
        }
        return false;
    }

    /**
     * @static
     * @param string $type
     * @return bool
     */
    protected static function _switchSession($type)
    {
        if (null === self::$_sessionNameBackup) {
            self::$_sessionNameBackup = session_name();
        }

        $roles = self::_getSessionConfig('rolePostfix');
        if (is_array($roles)) {
            foreach ($roles as $role) {
                if ($role['currentPagePrefix'] == $type) {
                    $sessionName = __getSessionName($type);
                    __switchSession($sessionName);
                }
            }
        }
        return true;
    }

    protected static function _restoreSession()
    {
        if (null !== self::$_sessionNameBackup && self::$_sessionNameBackup != session_name()) {
            __switchSession(self::$_sessionNameBackup);
        }
        return true;
    }

    /**
     * @static
     * @param string|null $var
     * @return mixed
     */
    protected static function _getSessionConfig($var = null)
    {
        if (null === self::$_sessionConfig) {
            self::$_sessionConfig = Zend_Registry::get('config')->session->toArray();
        }
        if (null !== $var) {
            return Qs_Array::get(self::$_sessionConfig, $var);
        }
        return self::$_sessionConfig;
    }
}