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<?php
/**
 * @package         NoNumber Installer
 * @version
 *
 * @author          Peter van Westen <peter@nonumber.nl>
 * @link            http://www.nonumber.nl
 * @copyright       Copyright © 2015 NoNumber All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

defined('_JEXEC') or die;

class PlgSystemNoNumberInstallerInstallerScript
{
	private $min_joomla_version = '3.4.1';
	private $min_php_version = '5.3.13';

      public function preflight($route, JAdapterInstance $adapter)
	{
   	JFactory::getLanguage()->load('plg_system_nonumberinstaller', __DIR__);

		if (!$this->passMinimumJoomlaVersion())
     	{
	   	$this->uninstallInstaller();

	  return false;
		}

		if (!$this->passMinimumPHPVersion())
      	{
		   $this->uninstallInstaller();

			return false;
		}
     }

	public function postflight($route, JAdapterInstance $adapter)
   {
	if (!in_array($route, array('install', 'update')))
	  {
	      	return;
   	}

		$this->renameOldUpdateSites();
     	$this->removeDuplicateUpdateSites();

		// First install the NoNumber Framework
   	$this->installFramework();

	// Then install the rest of the packages
		if (!$this->installPackages())
		{
  		// Uninstall this installer
			$this->uninstallInstaller();

			return false;
		}

		JFactory::getApplication()->enqueueMessage(JText::_('NNI_PLEASE_CLEAR_YOUR_BROWSERS_CACHE'), 'notice');

      	// Uninstall this installer
		$this->uninstallInstaller();
	}

	private function renameOldUpdateSites()
	{
	   $db = JFactory::getDbo();

	     $query = $db->getQuery(true)
	   	->select('update_site_id')
		->from('#__update_sites')
		  ->where($db->qn('location') . ' LIKE ' . $db->q('http://cdn.download.nonumber.nl%'))
	      	->where($db->qn('name') . ' NOT LIKE ' . $db->q('NoNumber%'));
   	$db->setQuery($query);
	     $ids = $db->loadColumn();

		if (empty($ids))
		{
			return;
		}

		$query->clear()
   		->update('#__update_sites')
		->set($db->qn('name') . ' = CONCAT(' . $db->q('NoNumber ') . ',' . $db->qn('name') . ')')
	  	->where($db->qn('update_site_id') . ' IN (' . implode(',', $ids) . ')');
      	$db->setQuery($query);
   	$db->execute();
	}

	private function removeDuplicateUpdateSites()
     {
		$db = JFactory::getDbo();

	   $query = $db->getQuery(true)
		->select('update_site_id')
	  	->from('#__update_sites')
			->where($db->qn('name') . ' LIKE ' . $db->q('NoNumber%'))
			->group($db->qn('name'))
		      ->having('count(*) > 1');
		$db->setQuery($query);
   	$ids = $db->loadColumn();

		if (empty($ids))
		{
		     return;
	   }

		$query->clear()
	  ->delete('#__update_sites')
			->where($db->qn('update_site_id') . ' IN (' . implode(',', $ids) . ')');
		$db->setQuery($query);
      	$db->execute();

	   $query->clear()
			->delete('#__update_sites_extensions')
     	   ->where($db->qn('update_site_id') . ' IN (' . implode(',', $ids) . ')');
	$db->setQuery($query);
	  $db->execute();
	}

      // Check if Joomla version passes minimum requirement
	private function passMinimumJoomlaVersion()
	{
		if (version_compare(JVERSION, $this->min_joomla_version, '<'))
		{
   		JFactory::getApplication()->enqueueMessage(
				JText::sprintf('NNI_NOT_COMPATIBLE_UPDATE', JVERSION, $this->min_joomla_version),
     			'error'
		   );

		return false;
		}

  	return true;
	}

      // Check if PHP version passes minimum requirement
	private function passMinimumPHPVersion()
   {

	     if (version_compare(PHP_VERSION, $this->min_php_version, 'l'))
		{
	   	JFactory::getApplication()->enqueueMessage(
		  JText::sprintf('NNI_NOT_COMPATIBLE_PHP', PHP_VERSION, $this->min_php_version),
			      'error'
			);

   	     return false;
		}

   	return true;
	}

	private function installPackages()
	{
	$packages = JFolder::folders(__DIR__ . '/packages');

	  $packages = array_diff($packages, array('plg_system_nnframework'));

	      foreach ($packages as $package)
		{
	   	if (!$this->installPackage($package))
     		{
				return false;
	   	}
	}

		return true;
	}

	private function installPackage($package)
  {
		$tmpInstaller = new JInstaller;

      	return $tmpInstaller->install(__DIR__ . '/packages/' . $package);
	}

	private function installFramework()
	{
		return $this->installPackage('plg_system_nnframework');
	}

	private function uninstallInstaller()
	{
	   if (!JFolder::exists(JPATH_SITE . '/plugins/system/nonumberinstaller'))
		{
		     return;
	   }

	$this->deleteFolders(
			array(
			  JPATH_SITE . '/plugins/system/nonumberinstaller/language',
		      	JPATH_SITE . '/plugins/system/nonumberinstaller',
	   	)
		);

     	$db = JFactory::getDbo();

   	$query = $db->getQuery(true)
		->delete('#__extensions')
			->where($db->quoteName('element') . ' = ' . $db->quote('nonumberinstaller'))
			->where($db->quoteName('folder') . ' = ' . $db->quote('system'))
  		->where($db->quoteName('type') . ' = ' . $db->quote('plugin'));
      	$db->setQuery($query);
		$db->execute();
	}

	public function deleteFolders($folders = array())
	{
		foreach ($folders as $folder)
   	{
		     if (!is_dir($folder))
			{
   			continue;
			}

		JFolder::delete($folder);
		}
	}
}