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<?php
/**
 * Copyright © Extmag. All rights reserved.
 */

namespace Extmag\Core\Helper;

use RuntimeException;

class Registry
{
    protected $stack = [];
    protected $registry = [];

    /**
     * @param $name
     * @return mixed|null
     */
    public function getValue($name)
    {
        return $this->stack[$name] ?? null;
    }

    /**
     * @param $name
     * @param $val
     * @return bool
     */
    public function setValue($name, $val)
    {
        if (!isset($this->stack[$name])) {
            $this->stack[$name] = $val;
            return true;
        }

        return false;
    }

    /**
     * @param $name
     * @return bool
     */
    public function unsValue($name)
    {
        if (isset($this->stack[$name])) {
            unset($this->stack[$name]);
            return true;
        }

        return false;
    }

    /**
     * @param $key
     * @return mixed|null
     */
    public function registry($key)
    {
        if (isset($this->registry[$key])) {
            return $this->registry[$key];
        }
        return null;
    }

    /**
     * @param $key
     * @param $value
     * @param $graceful
     * @return void
     */
    public function register($key, $value, $graceful = false)
    {
        if (isset($this->registry[$key])) {
            if ($graceful) {
                return;
            }
            throw new RuntimeException('Registry key "' . $key . '" already exists');
        }
        $this->registry[$key] = $value;
    }

    /**
     * @param $key
     * @return void
     */
    public function unregister($key)
    {
        if (isset($this->registry[$key])) {
            if (is_object($this->registry[$key])
                && method_exists($this->registry[$key], '__destruct')
                && is_callable([$this->registry[$key], '__destruct'])
            ) {
                $this->registry[$key]->__destruct();
            }
            unset($this->registry[$key]);
        }
    }

    /**
     * @return void
     */
    public function __destruct()
    {
        $keys = array_keys($this->registry);
        array_walk($keys, [$this, 'unregister']);
    }
}