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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Quickicon.Downloadkey
 *
 * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\Component\Installer\Administrator\Helper\InstallerHelper as ComInstallerHelper;

/**
 * Joomla! update notification plugin
 *
 * @since  4.0.0
 */
class PlgQuickiconDownloadkey extends CMSPlugin
{
	/**
	 * Load the language file on instantiation.
	 *
	 * @var    boolean
	 * @since  4.0.0
	 */
	protected $autoloadLanguage = true;

/**
	 * Application object.
	 *
	 * @var    CMSApplication
	 * @since  4.0.0
	 */
	protected $app;

/**
	 * Returns an icon definition for an icon which looks for extensions updates
	 * via AJAX and displays a notification when such updates are found.
	 *
	 * @param   string  $context  The calling context
	 *
	 * @return  array  A list of icon definition associative arrays, consisting of the
	 *                 keys link, image, text and access.
	 *
	 * @since   4.0.0
	 */
	public function onGetIcons($context)
	{
		if ($context !== $this->params->get('context', 'update_quickicon')
			|| !$this->app->getIdentity()->authorise('core.manage', 'com_installer')
		)
		{
			return [];
		}

$info = $this->getMissingDownloadKeyInfo();

// No extensions need a download key. The icon is not rendered.
		if (!$info['supported'])
		{
			return [];
		}

$iconDefinition = [
			'link'  => 'index.php?option=com_installer&view=updatesites&filter[supported]=1',
			'image' => 'icon-key',
			'icon'  => '',
			'text'  => Text::_('PLG_QUICKICON_DOWNLOADKEY_OK'),
			'class' => 'success',
			'id'    => 'plg_quickicon_downloadkey',
			'group' => 'MOD_QUICKICON_MAINTENANCE',
		];

if ($info['missing'] !== 0)
		{
			$iconDefinition = array_merge($iconDefinition, [
				'link'  => 'index.php?option=com_installer&view=updatesites&filter[supported]=-1',
				'text'  => Text::plural('PLG_QUICKICON_DOWNLOADKEY_N_MISSING', $info['missing']),
				'class' => 'danger',
				]
			);
		}

return [
			$iconDefinition,
		];
	}

/**
	 * Gets the information about update sites requiring but missing a download key.
	 *
	 * The return array has two keys:
	 * - supported  Number of update sites supporting Download Key
	 * - missing    Number of update sites missing a Download Key
	 *
	 * If 'supported' is zero you do not need to provide any download keys. All your extensions are free downloads.
	 *
	 * If 'supported' is non-zero and 'missing' is zero you have entered a download key for all paid extensions.
	 *
	 * If 'supported' is non-zero and 'missing' is also non-zero you need to enter one or more download keys.
	 *
	 * @return  array
	 * @since   4.0.0
	 */
	public function getMissingDownloadKeyInfo(): array
	{
		$ret = [
			'supported' => 0,
			'missing'   => 0,
		];

if (!class_exists('Joomla\Component\Installer\Administrator\Helper\InstallerHelper'))
		{
			require_once JPATH_ADMINISTRATOR . '/components/com_installer/Helper/InstallerHelper.php';
		}

$supported        = ComInstallerHelper::getDownloadKeySupportedSites(true);
		$ret['supported'] = count($supported);

if ($ret['supported'] === 0)
		{
			return $ret;
		}

$missing        = ComInstallerHelper::getDownloadKeyExistsSites(false, true);
		$ret['missing'] = count($missing);

return $ret;
	}
}