<?php
/**
 * MS Framework
 *
 * @package    	MS Framework Library
 * @version 	1.2.1.573
 *
 * @author 		Michael Snoeren
 * @link 		https://snoerendevelopment.nl/
 * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */

// Deny direct access
defined('_JEXEC') or die;

abstract class MSFrameworkInstall
{
	/**
	 * Install a package
	 * @param 	String 	$path 	The path to the extension
	 * @access 	Public
	 * @return 	Boolean
	 */
	public static function install($path)
	{
		$installer 				= new JInstaller;

		// Ignore empty installations
		if (empty($path) || !JFolder::exists($path)) {
			return false;
		}

		// Set the source path
		$installer->setPath('source', $path);

		// Get the manifest
		$manifest 				= (array) $installer->getManifest();

		// Check the manifest
		if (!count($manifest) || !array_key_exists('name', $manifest) || !array_key_exists('version', $manifest)) {
			return false;
		}

		if (self::isInstalled($manifest['name'])) {
			if (version_compare(self::getVersion($manifest['name']), $manifest['version']) !== 1) {
				return $installer->install($path) && self::clearMessageQueue();
			}

			JFactory::getApplication()->enqueueMessage(JText::_('PLG_MSFRAMEWORK_ERROR_OLDER_VERSION'), 'warning');
			return false;
		} else {
			return $installer->install($path) && self::clearMessageQueue();
		}

		return false;
	}

	/**
	 * Check if an extension is installed yet
	 * @param 	String 	$name 	The extension name
	 * @access 	Public
	 * @return 	Boolean
	 */
	public static function isInstalled($name)
	{
		if (empty($name)) {
			return false;
		}

		$db 					= JFactory::getDbo();
		$query 					= $db->getQuery(true);

		$query
		->select($db->quoteName('element'))
		->from('#__extensions')
		->where($db->quoteName('name') . ' = ' . $db->quote($name))
		->setLimit(1);

		$db->setQuery($query);
		$db->execute();

		return ($db->getNumRows() > 0);
	}

	/**
	 * Get the current version installed of an extension
	 * @param 	String 	$name 	The extension name
	 * @access 	Public
	 * @return 	String 			Empty if not found
	 */
	public static function getVersion($name)
	{
		if (!self::isInstalled($name)) {
			return '';
		}

		$db 					= JFactory::getDbo();
		$query 					= $db->getQuery(true);

		$query
		->select($db->quoteName('manifest_cache'))
		->from('#__extensions')
		->where($db->quoteName('name') . ' = ' . $db->quote($name))
		->setLimit(1);

		$db->setQuery($query);
		if (!$db->execute()) {
			return '';
		}

		// Get only the cache
		$data 					= $db->loadResult();

		if (empty($data)) {
			return '';
		}

		$json 					= @json_decode($data, true);

		if (is_null($json) || !count($json) || !array_key_exists('version', $json)) {
			return '';
		}

		return $json['version'];
	}

	/**
	 * Get the manifest from a path
	 * @param 	String 	$path 	The path to look in
	 * @access 	Public
	 * @return 	Mixed 			False is failed, array if succeeded
	 */
	public static function getManifest($path)
	{
		jimport('joomla.filesystem.folder');

		if (empty($path) || !JFolder::exists($path)) {
			return false;
		}

		$installer 				= new JInstaller;

		// Set the source path
		$installer->setPath('source', $path);

		// Get the manifest
		$manifest 				= (array) $installer->getManifest();
		self::clearMessageQueue();

		if (!count($manifest)) {
			return false;
		}

		return $manifest;
	}

	/**
	 * Display a message
	 * @param 	String 	$msg 	The translatable message
	 * @access 	Public
	 * @return 	Void
	 */
	public static function showMessage($msg)
	{
		$app 					= JFactory::getApplication();
		$input 					= $app->input;
		$option 				= $input->getCmd('option', '');
		$view 					= $input->getCmd('view', '');

		if ($option === 'com_installer' && $view === 'update') {
			$app->enqueueMessage(JText::_($msg));
		}
	}

	/**
	 * Clear the message queue
	 * @access 	Public
	 * @return 	Boolean 		Always true
	 */
	public static function clearMessageQueue()
	{
		$session 				= JFactory::getSession();
		$sessionQueue 			= $session->set('application.queue', null);
		$queue 					= JFactory::getApplication()->getMessageQueue();
		return true;
	}
}