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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 MagicMethods {

    /** Classic PHP magic methods for object access ***************************/

    /**
     * @inheritDocs
     * @param string $key
     * @return mixed
     */
    public function __get ($key) {
        /** @var $this \MvcCore\Session */
        $name = $this->__name;
        if (isset($_SESSION[$name][$key])) return $_SESSION[$name][$key];
        return NULL;
    }

    /**
     * @inheritDocs
     * @param string $key
     * @param mixed $value
     * @return mixed
     */
    public function __set ($key, $value) {
        /** @var $this \MvcCore\Session */
        return $_SESSION[$this->__name][$key] = $value;
    }

    /**
     * @inheritDocs
     * @param string $key
     * @return bool
     */
    public function __isset ($key) {
        /** @var $this \MvcCore\Session */
        return isset($_SESSION[$this->__name][$key]);
    }

    /**
     * @inheritDocs
     * @param string $key
     * @return void
     */
    public function __unset ($key) {
        /** @var $this \MvcCore\Session */
        $name = $this->__name;
        if (array_key_exists($key, $_SESSION[$name])) 
            unset($_SESSION[$name][$key]);
    }

    /**
     * Print all about current session namespace instance for debug purposes.
     * @return array
     */
    public function __debugInfo () {
        /** @var $this \MvcCore\Session */
        $hoops = isset(static::$meta->hoops[$this->__name])
            ? static::$meta->hoops[$this->__name]
            : NULL;
        $expiration = isset(static::$meta->expirations[$this->__name])
            ? static::$meta->expirations[$this->__name]
            : NULL;
        return [
            'name'                  => $this->__name,
            'expirationSeconds'     => date('D, d M Y H:i:s', $expiration),
            'expirationHoops'       => $hoops,
            'values'                => $_SESSION[$this->__name],
        ];
    }


    /** \Countable interface **************************************************/

    /**
     * Get how many records is in the session namespace.
     * Example: `count($sessionNamespace);`
     * @return int
     */
    public function count () {
        /** @var $this \MvcCore\Session */
        return count((array) $_SESSION[$this->__name]);
    }


    /** \Iterator interface ***************************************************/

    /**
     * Return the current element.
     * @return mixed
     */
    public function current () {
        /** @var $this \MvcCore\Session */
        return current($_SESSION[$this->__name]);
    }

    /**
     * Return the key of the current element.
     * @return string|int
     */
    public function key () {
        /** @var $this \MvcCore\Session */
        return key($_SESSION[$this->__name]);
    }

    /**
     * Move forward to next element.
     * @return void
     */
    public function next () {
        /** @var $this \MvcCore\Session */
        return next($_SESSION[$this->__name]);
    }

    /**
     * Rewind the Iterator to the first element.
     * @return void
     */
    public function rewind () {
        /** @var $this \MvcCore\Session */
        reset($_SESSION[$this->__name]);
    }

    /**
     * Checks if current position is valid.
     * @return bool
     */
    public function valid () {
        /** @var $this \MvcCore\Session */
        return key($_SESSION[$this->__name]) !== NULL;
    }


    /** \ArrayAccess interface ************************************************/

    /**
     * Set the value at the specified index.
     * Example: `$sessionNamespace['any'] = 'thing';`
     * @param mixed $offset
     * @param mixed $value
     */
    public function offsetSet ($offset, $value) {
        /** @var $this \MvcCore\Session */
        $data = & $_SESSION[$this->__name];
        if ($offset === NULL) {
            $data[] = $value;
        } else {
            $data[$offset] = $value;
        }
    }

    /**
     * Get the value at the specified index.
     * Example: `$thing = $sessionNamespace['any'];`
     * @param mixed $offset
     * @param mixed $value
     */
    public function offsetGet ($offset) {
        /** @var $this \MvcCore\Session */
        $data = & $_SESSION[$this->__name];
        return isset($data[$offset]) ? $data[$offset] : NULL;
    }

    /**
     * Return whether the requested index exists.
     * Example: `isset($sessionNamespace['any']);`
     * @param mixed $offset
     * @return bool
     */
    public function offsetExists ($offset) {
        /** @var $this \MvcCore\Session */
        return isset($_SESSION[$this->__name][$offset]);
    }

    /**
     * Unset the value at the specified index.
     * Example: `unset($sessionNamespace['any']);`
     * @param mixed $offset
     */
    public function offsetUnset ($offset) {
        /** @var $this \MvcCore\Session */
        unset($_SESSION[$this->__name][$offset]);
    }
}