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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license  https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Session;

trait MetaData {
    
    /**
     * @inheritDocs
     * @return \stdClass
     */
    public static function GetSessionMetadata () {
        return static::$meta;
    }

    /**
     * Set up MvcCore session namespaces metadata
     * about namespaces names, hoops and expirations.
     * Called only once at session start by `\MvcCore\ISession::Start();`.
     * @return void
     */
    protected static function setUpMeta () {
        $metaKey = static::SESSION_METADATA_KEY;
        $meta = [];
        if (isset($_SESSION[$metaKey]))
            $meta = @unserialize($_SESSION[$metaKey]);
        if (!$meta)
            $meta = [
                'names'         => [],
                'hoops'         => [],
                'expirations'   => [],
            ];
        $meta = (object) $meta;
        static::$meta = & $meta;
    }

    /**
     * Set up namespaces data - only if data has not been expired yet,
     * if data has been expired, unset data from
     * `\MvcCore\Session::$meta` and `$_SESSION` storage.
     * Called only once at session start by `\MvcCore\Session::Start();`.
     * @return void
     */
    protected static function setUpData () {
        $hoops = & static::$meta->hoops;
        $names = & static::$meta->names;
        $expirations = & static::$meta->expirations;
        foreach ($hoops as $name => $hoop) {
            $hoops[$name] -= 1;
        }
        foreach ($names as $name => $one) {
            $unset = [];
            if (isset($hoops[$name])) {
                if ($hoops[$name] < 0) $unset[] = 'hoops';
            }
            if (isset($expirations[$name])) {
                $expiration = $expirations[$name];
                if ($expiration < static::$sessionStartTime) {
                    $unset[] = 'expirations';
                } else if ($expiration > static::$sessionMaxTime) {
                    static::$sessionMaxTime = $expiration;
                }
            }
            if ($unset) {
                $currentErrRepLevels = error_reporting();
                error_reporting(0);
                foreach ($unset as $unsetKey) {
                    if (isset(static::$meta->{$unsetKey}) && isset(static::$meta->{$unsetKey}[$name])) {
                        unset(static::$meta->{$unsetKey}[$name]);
                    }
                }
                error_reporting($currentErrRepLevels);
                unset($names[$name]);
                unset($_SESSION[$name]);
            }
        }
    }
}