<?php
/**
 * Enlight
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://enlight.de/license
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@shopware.de so we can send you a copy immediately.
 *
 * @category   Enlight
 * @package    Enlight_Plugin
 * @copyright  Copyright (c) 2011, shopware AG (http://www.shopware.de)
 * @license    http://enlight.de/license     New BSD License
 * @version    $Id$
 * @author     Heiner Lohaus
 * @author     $Author$
 */

/**
 * The Enlight_Plugin_Namespace_Config loads plugins over an Enlight_Config.
 *
 * With the Enlight_Plugin_Namespace_Config component, plugins can be loaded and stored over an Enlight_Config.
 * The Enlight_Plugin_Namespace_Config will be extended automatically if another plugin
 * is registered for the namespace.
 * It also offers the possibility to configure the plugin directly from this configuration.
 * To get the configuration of the loaded plugins, the Enlight_Plugin_Namespace_Config offers
 * a function to return the config.
 * To use this directly in the plugin there is the extra extended Plugin_Bootstrap_Config component.
 *
 * @category   Enlight
 * @package    Enlight_Plugin
 * @copyright  Copyright (c) 2011, shopware AG (http://www.shopware.de)
 * @license    http://enlight.de/license     New BSD License
 */
class Enlight_Plugin_Namespace_Config extends Enlight_Plugin_Namespace
{
    /**
     * @var Enlight_Config Contains an instance of the Enlight_Config. Can be overwritten in the class
     * constructor by using the $options["storage"] array element.
     */
    protected $storage;

    /**
     * @var Enlight_Event_Subscriber Contains an instance of Enlight_Event_Subscriber.
     */
    protected $subscriber;

    /**
     * The Enlight_Plugin_Namespace_Config class constructor expects a storage (Enlight_Config).
     * The options array must contain an array element named "storage" which contains an additional array
     * with storage settings or only with a name for the storage.
     * If the name is passed as array, it is used to instantiate the storage.
     *
     * @param   string $name
     * @param   null|Enlight_Config $storage
     */
    public function __construct($name, $storage = null)
    {
        if ($storage !== null && $storage instanceof Enlight_Config) {
            $this->storage = $storage;
        }

        parent::__construct($name);
    }

    /**
     * Loads a plugin in the plugin namespace by name over the Enlight_Config.
     *
     *
     * @param $name
     * @param bool $throwException
     * @return \Enlight_Plugin_Namespace_Config|\Enlight_Plugin_PluginCollection
     */
    public function load($name, $throwException = true)
    {
        $item = $this->Storage()->plugins->$name;
        if ($item === null || $this->plugins->offsetExists($name) || !(class_exists($item->class) || class_exists($item->class.'Dummy'))) {
            return parent::load($name, $throwException);
        }

        /** @var $item \Enlight_Config */
        $classname = $item->get('class');
        if (!class_exists($classname)) {
            $classname .= 'Dummy';
        }

        /** @var $plugin Enlight_Plugin_Bootstrap_Config */
        $plugin = new $classname($name, $item);

        return parent::registerPlugin($plugin);
    }

    /**
     * Writes all registered plugins into the storage.
     * The subscriber and the registered plugins are converted to an array.
     *
     * @return  Enlight_Plugin_Namespace_Config
     */
    public function write()
    {
        $this->storage->plugins = $this->toArray();
        $this->storage->listeners = $this->Subscriber()->toArray();
        $this->storage->write();
        return $this;
    }

    /**
     * Loads all plugins in the plugin namespace over the storage.
     *
     * @return  Enlight_Plugin_Namespace_Config
     */
    public function read()
    {
        foreach ($this->Storage()->plugins as $name => $value) {
            $this->load($name);
        }
        return $this;
    }

    /**
     * @return Enlight_Config
     */
    public function Storage()
    {
        if (!isset($this->storage)) {
            $this->storage = $this->initStorage();
        }

        return $this->storage;
    }

    /**
     * @return Enlight_Config
     */
    public function reloadStorage()
    {
        $this->storage = $this->initStorage();

        return $this->storage;
    }

    /**
     * @return Enlight_Config
     */
    protected function initStorage()
    {
    }

    /**
     * Returns the instance of the Enlight_Event_Subscriber_Plugin. If the subscriber
     * isn't instantiated the function will load it automatically.
     *
     * @return  Enlight_Event_Subscriber_Plugin
     */
    public function Subscriber()
    {
        if ($this->subscriber === null) {
            $this->subscriber = new Enlight_Event_Subscriber_Plugin($this, $this->Storage());
        }

        return $this->subscriber;
    }

    /**
     * Returns the plugin configuration by the plugin name. If the
     * plugin has no config, the config is automatically set an empty array.
     *
     * @param   string $name
     * @return  Enlight_Config|array
     */
    public function getConfig($name)
    {
        $item = $this->Storage()->plugins->$name;
        if (!isset($item->config)) {
            $item->config = array();
        }
        return $item->config;
    }

    /**
     * @param   $name
     * @param   $config
     * @return  Enlight_Plugin_Namespace_Config
     */
    public function setConfig($name, $config)
    {
        if (!isset($this->Storage()->plugins->$name)) {
            $this->Storage()->plugins->$name = array();
        }
        $this->Storage()->plugins->$name->config = $config;
        return $this;
    }

    /**
     * Converts the internal plugin property to an array and returns it.
     * @return  array
     */
    public function toArray()
    {
        $this->read();
        $plugins = array();
        /** @var $plugin Enlight_Plugin_Bootstrap_Config */
        foreach ($this->plugins as $name => $plugin) {
            $plugins[$name] = array(
                'name' => $plugin->getName(),
                'class' => get_class($plugin),
                'config' => $plugin->Config()
            );
        }
        return $plugins;
    }
}
