Sindbad~EG File Manager

<?php

/**
 * @version             4.0.5
 * @package             TAGZ
 * @copyright           Copyright (C) 2021 roosterz.nl. All rights reserved.
 * @license             GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 * Joomla! is free software. This version may have been modified pursuant
 * to the GNU General Public License, and as distributed it includes or
 * is derivative of works licensed under the GNU General Public License or
 * other free or open source software licenses.
 */

// no direct access
defined('_JEXEC') or die('Restricted access');

class pkg_tagzInstallerScript
{
    /**
	 *  Minimum Joomla required version
	 *
	 *  @var  string
	 */
	private $min_joomla_version = '3.7';

	/**
	 *  Minimum PHP required version
	 *
	 *  @var  string
	 */
	private $min_php_version = '5.4.0';

	/**
	 *  Joomla Global Application object
	 *
	 *  @var  object
	 */
	private $app;

	/**
	 *  Class Constructor
	 */
	function __construct()
	{
		$this->app = JFactory::getApplication();
	}

	/**
	 *  Requirements Checks before installation
	 *
	 *  @param   object             $route
	 *  @param   JInstallerAdapter  $adapter
	 *
	 *  @return  bool
	 */
	public function preflight($route, $adapter)
	{
		// Check Joomla and PHP minimum required version
		if (!$this->passMinimumRequirementVersion("joomla"))
		{
			return false;
		}

		if (!$this->passMinimumRequirementVersion("php"))
		{
			return false;
		}

		return true;
	}

    /**
     * Method to run after the install, update, or discover_update actions have completed.
     *
     * @return void
     */
    public function postflight($type, $parent)
    {

        // We only need to perform this if the extension is being installed, not updated
        if ($type == 'install') {

            $this->enablePlugin('tagz', 'system');

            $url = 'index.php?option=com_tagz';
            JFactory::getApplication()->redirect($url);
        }
        if ($type == 'update') {

            $this->enablePlugin('tagz', 'system');

            // Get the plugin information
            $db = JFactory::getDbo();
            $query = $db->getQuery(true)
                ->select('*')
                ->from($db->quoteName('#__extensions'))
                ->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
                ->where($db->quoteName('folder') . ' = ' . $db->quote('system'))
                ->where($db->quoteName('element') . ' = ' . $db->quote('tagz'));
            $db->setQuery($query);
            $plugin = $db->loadObject();

            $url = 'index.php?option=com_tagz';

            $complete_string = '<strong>TAGZ</strong> has been successfully updated to version <strong>4.0.5 FREE</strong>.<br /><br />You can open the dashboard by clicking <a href="%s">HERE</a>.<br /><br />The TAGZ Changelog can be found <a href="https://www.roosterz.nl/support/changelog/tagz" target="_blank">HERE.</a>';
            JFactory::getApplication()->enqueueMessage(sprintf($complete_string, $url));
        }

        JFactory::getCache()->clean('com_plugins');
    }

    private function passMinimumRequirementVersion($type = "joomla")
	{
		switch ($type)
		{
			case 'joomla':
				if (version_compare(JVERSION, $this->min_joomla_version, '<'))
				{
					$this->app->enqueueMessage(
						JText::sprintf('This extension is no longer supported on Joomla! %1$s. Please update to a more recent version of Joomla! v%2$s or higher.', JVERSION, $this->min_joomla_version),
						'error'
					);
					return false;
				}
				break;
			case 'php':
				if (version_compare(PHP_VERSION, $this->min_php_version, 'l'))
				{
					$this->app->enqueueMessage(
						JText::sprintf('This extension is not compatible with PHP %1$s. You need PHP %2$s or higher to be able to install and use this extension.', PHP_VERSION, $this->min_php_version),
						'error'
					);
					return false;
				}
				break;
		}

		return true;
	}

    private function enablePlugin($name, $plugin_folder)
    {
        $db = JFactory::getDbo();
        $query = $db->getQuery(true)
            ->update($db->quoteName('#__extensions'))
            ->set($db->quoteName('enabled') . ' = 1')
            ->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
            ->where($db->quoteName('folder') . ' = ' . $db->quote($plugin_folder))
            ->where($db->quoteName('element') . ' = ' . $db->quote($name));
        $db->setQuery($query);
        $db->execute();
    }

}