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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Plugin;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Cache\Exception\CacheExceptionInterface;
use Joomla\CMS\Factory;
use Joomla\Event\DispatcherAwareInterface;
use Joomla\Event\DispatcherInterface;

/**
 * Plugin helper class
 *
 * @since  1.5
 */
abstract class PluginHelper
{
	/**
	 * A persistent cache of the loaded plugins.
	 *
	 * @var    array
	 * @since  1.7
	 */
	protected static $plugins = null;

/**
	 * Get the path to a layout from a Plugin
	 *
	 * @param   string  $type    Plugin type
	 * @param   string  $name    Plugin name
	 * @param   string  $layout  Layout name
	 *
	 * @return  string  Layout path
	 *
	 * @since   3.0
	 */
	public static function getLayoutPath($type, $name, $layout = 'default')
	{
		$templateObj   = Factory::getApplication()->getTemplate(true);
		$defaultLayout = $layout;
		$template      = $templateObj->template;

if (strpos($layout, ':') !== false)
		{
			// Get the template and file name from the string
			$temp = explode(':', $layout);
			$template = $temp[0] === '_' ? $templateObj->template : $temp[0];
			$layout = $temp[1];
			$defaultLayout = $temp[1] ?: 'default';
		}

// Build the template and base path for the layout
		$tPath = JPATH_THEMES . '/' . $template . '/html/plg_' . $type . '_' . $name . '/' . $layout . '.php';
		$iPath = JPATH_THEMES . '/' . $templateObj->parent . '/html/plg_' . $type . '_' . $name . '/' . $layout . '.php';
		$bPath = JPATH_PLUGINS . '/' . $type . '/' . $name . '/tmpl/' . $defaultLayout . '.php';
		$dPath = JPATH_PLUGINS . '/' . $type . '/' . $name . '/tmpl/default.php';

// If the template has a layout override use it
		if (is_file($tPath))
		{
			return $tPath;
		}
		elseif (!empty($templateObj->parent) && is_file($iPath))
		{
			return $iPath;
		}
		elseif (is_file($bPath))
		{
			return $bPath;
		}
		else
		{
			return $dPath;
		}
	}

/**
	 * Get the plugin data of a specific type if no specific plugin is specified
	 * otherwise only the specific plugin data is returned.
	 *
	 * @param   string  $type    The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string  $plugin  The plugin name.
	 *
	 * @return  mixed  An array of plugin data objects, or a plugin data object.
	 *
	 * @since   1.5
	 */
	public static function getPlugin($type, $plugin = null)
	{
		$result = array();
		$plugins = static::load();

// Find the correct plugin(s) to return.
		if (!$plugin)
		{
			foreach ($plugins as $p)
			{
				// Is this the right plugin?
				if ($p->type === $type)
				{
					$result[] = $p;
				}
			}
		}
		else
		{
			foreach ($plugins as $p)
			{
				// Is this plugin in the right group?
				if ($p->type === $type && $p->name === $plugin)
				{
					$result = $p;
					break;
				}
			}
		}

return $result;
	}

/**
	 * Checks if a plugin is enabled.
	 *
	 * @param   string  $type    The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string  $plugin  The plugin name.
	 *
	 * @return  boolean
	 *
	 * @since   1.5
	 */
	public static function isEnabled($type, $plugin = null)
	{
		$result = static::getPlugin($type, $plugin);

return !empty($result);
	}

/**
	 * Loads all the plugin files for a particular type if no specific plugin is specified
	 * otherwise only the specific plugin is loaded.
	 *
	 * @param   string               $type        The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string               $plugin      The plugin name.
	 * @param   boolean              $autocreate  Autocreate the plugin.
	 * @param   DispatcherInterface  $dispatcher  Optionally allows the plugin to use a different dispatcher.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.5
	 */
	public static function importPlugin($type, $plugin = null, $autocreate = true, DispatcherInterface $dispatcher = null)
	{
		static $loaded = array();

// Check for the default args, if so we can optimise cheaply
		$defaults = false;

if ($plugin === null && $autocreate === true && $dispatcher === null)
		{
			$defaults = true;
		}

// Ensure we have a dispatcher now so we can correctly track the loaded plugins
		$dispatcher = $dispatcher ?: Factory::getApplication()->getDispatcher();

// Get the dispatcher's hash to allow plugins to be registered to unique dispatchers
		$dispatcherHash = spl_object_hash($dispatcher);

if (!isset($loaded[$dispatcherHash]))
		{
			$loaded[$dispatcherHash] = array();
		}

if (!$defaults || !isset($loaded[$dispatcherHash][$type]))
		{
			$results = null;

// Load the plugins from the database.
			$plugins = static::load();

// Get the specified plugin(s).
			for ($i = 0, $t = \count($plugins); $i < $t; $i++)
			{
				if ($plugins[$i]->type === $type && ($plugin === null || $plugins[$i]->name === $plugin))
				{
					static::import($plugins[$i], $autocreate, $dispatcher);
					$results = true;
				}
			}

// Bail out early if we're not using default args
			if (!$defaults)
			{
				return $results;
			}

$loaded[$dispatcherHash][$type] = $results;
		}

return $loaded[$dispatcherHash][$type];
	}

/**
	 * Loads the plugin file.
	 *
	 * @param   object               $plugin      The plugin.
	 * @param   boolean              $autocreate  True to autocreate.
	 * @param   DispatcherInterface  $dispatcher  Optionally allows the plugin to use a different dispatcher.
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	protected static function import($plugin, $autocreate = true, DispatcherInterface $dispatcher = null)
	{
		static $plugins = array();

// Get the dispatcher's hash to allow paths to be tracked against unique dispatchers
		$hash = spl_object_hash($dispatcher) . $plugin->type . $plugin->name;

if (\array_key_exists($hash, $plugins))
		{
			return;
		}

$plugins[$hash] = true;

$plugin = Factory::getApplication()->bootPlugin($plugin->name, $plugin->type);

if ($dispatcher && $plugin instanceof DispatcherAwareInterface)
		{
			$plugin->setDispatcher($dispatcher);
		}

if (!$autocreate)
		{
			return;
		}

$plugin->registerListeners();
	}

/**
	 * Loads the published plugins.
	 *
	 * @return  array  An array of published plugins
	 *
	 * @since   3.2
	 */
	protected static function load()
	{
		if (static::$plugins !== null)
		{
			return static::$plugins;
		}

$levels = Factory::getUser()->getAuthorisedViewLevels();

/** @var \JCacheControllerCallback $cache */
		$cache = Factory::getCache('com_plugins', 'callback');

$loader = function () use ($levels)
		{
			$db = Factory::getDbo();
			$query = $db->getQuery(true)
				->select(
					$db->quoteName(
						[
							'folder',
							'element',
							'params',
							'extension_id',
						],
						[
							'type',
							'name',
							'params',
							'id',
						]
					)
				)
				->from($db->quoteName('#__extensions'))
				->where(
					[
						$db->quoteName('enabled') . ' = 1',
						$db->quoteName('type') . ' = ' . $db->quote('plugin'),
						$db->quoteName('state') . ' IN (0,1)',
					]
				)
				->whereIn($db->quoteName('access'), $levels)
				->order($db->quoteName('ordering'));
			$db->setQuery($query);

return $db->loadObjectList();
		};

try
		{
			static::$plugins = $cache->get($loader, [], md5(implode(',', $levels)), false);
		}
		catch (CacheExceptionInterface $cacheException)
		{
			static::$plugins = $loader();
		}

return static::$plugins;
	}
}