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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Workflow.Notification
 *
 * @copyright   (C) 2020 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\CMSApplicationInterface;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Event\Workflow\WorkflowTransitionEvent;
use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Language\LanguageFactoryInterface;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\User\UserFactoryInterface;
use Joomla\CMS\Workflow\WorkflowPluginTrait;
use Joomla\CMS\Workflow\WorkflowServiceInterface;
use Joomla\Event\EventInterface;
use Joomla\Event\SubscriberInterface;
use Joomla\Utilities\ArrayHelper;

/**
 * Workflow Notification Plugin
 *
 * @since  4.0.0
 */
class PlgWorkflowNotification extends CMSPlugin implements SubscriberInterface
{
	use WorkflowPluginTrait;

/**
	 * Load the language file on instantiation.
	 *
	 * @var    boolean
	 * @since  4.0.0
	 */
	protected $autoloadLanguage = true;

/**
	 * Loads the CMS Application for direct access
	 *
	 * @var   CMSApplicationInterface
	 * @since 4.0.0
	 */
	protected $app;

/**
	 * Database object.
	 *
	 * @var    JDatabaseDriver
	 * @since  3.9.0
	 */
	protected $db;

/**
	 * Returns an array of events this subscriber will listen to.
	 *
	 * @return   array
	 *
	 * @since   4.0.0
	 */
	public static function getSubscribedEvents(): array
	{
		return [
			'onContentPrepareForm'        => 'onContentPrepareForm',
			'onWorkflowAfterTransition'   => 'onWorkflowAfterTransition',
		];
	}

/**
	 * The form event.
	 *
	 * @param   Form      $form  The form
	 * @param   stdClass  $data  The data
	 *
	 * @return   boolean
	 *
	 * @since   4.0.0
	 */
	public function onContentPrepareForm(EventInterface $event)
	{
		$form = $event->getArgument('0');
		$data = $event->getArgument('1');

$context = $form->getName();

// Extend the transition form
		if ($context === 'com_workflow.transition')
		{
			$this->enhanceWorkflowTransitionForm($form, $data);
		}

return true;
	}

/**
	 * Send a Notification to defined users a transition is performed
	 *
	 * @param   string  $context  The context for the content passed to the plugin.
	 * @param   array   $pks      A list of primary key ids of the content that has changed stage.
	 * @param   object  $data     Object containing data about the transition
	 *
	 * @return   boolean
	 *
	 * @since   4.0.0
	 */
	public function onWorkflowAfterTransition(WorkflowTransitionEvent $event)
	{
		$context       = $event->getArgument('extension');
		$extensionName = $event->getArgument('extensionName');
		$transition    = $event->getArgument('transition');
		$pks           = $event->getArgument('pks');

if (!$this->isSupported($context))
		{
			return;
		}

$component = $this->app->bootComponent($extensionName);

// Check if send-mail is active
		if (empty($transition->options['notification_send_mail']))
		{
			return;
		}

// ID of the items whose state has changed.
		$pks = ArrayHelper::toInteger($pks);

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

// Get UserIds of Receivers
		$userIds = $this->getUsersFromGroup($transition);

// The active user
		$user = $this->app->getIdentity();

// Prepare Language for messages
		$defaultLanguage = ComponentHelper::getParams('com_languages')->get('administrator');
		$debug = $this->app->get('debug_lang');

$modelName = $component->getModelName($context);
		$model = $component->getMVCFactory()->createModel($modelName, $this->app->getName(), ['ignore_request' => true]);

// Don't send the notification to the active user
		$key = array_search($user->id, $userIds);

if (is_int($key))
		{
			unset($userIds[$key]);
		}

// Remove users with locked input box from the list of receivers
		if (!empty($userIds))
		{
			$userIds = $this->removeLocked($userIds);
		}

// If there are no receivers, stop here
		if (empty($userIds))
		{
			return;
		}

// Get the model for private messages
		$model_message = $this->app->bootComponent('com_messages')
			->getMVCFactory()->createModel('Message', 'Administrator');

// Get the title of the stage
		$model_stage = $this->app->bootComponent('com_workflow')
			->getMVCFactory()->createModel('Stage', 'Administrator');

$toStage = $model_stage->getItem($transition->to_stage_id)->title;

$hasGetItem = method_exists($model, 'getItem');
		$container = Factory::getContainer();

foreach ($pks as $pk)
		{
			// Get the title of the item which has changed
			$title = '';

if ($hasGetItem)
			{
				$title = $model->getItem($pk)->title;
			}

// Send Email to receivers
			foreach ($userIds as $user_id)
			{
				$receiver = $container->get(UserFactoryInterface::class)->loadUserById($user_id);

if ($receiver->authorise('core.manage', 'com_message'))
				{
					// Load language for messaging
					$lang = $container->get(LanguageFactoryInterface::class)
						->createLanguage($user->getParam('admin_language', $defaultLanguage), $debug);
					$lang->load('plg_workflow_notification');
					$messageText = sprintf($lang->_('PLG_WORKFLOW_NOTIFICATION_ON_TRANSITION_MSG'), $title, $user->name, $lang->_($toStage));

if (!empty($transition->options['notification_text']))
					{
						$messageText .= '<br>' . htmlspecialchars($lang->_($transition->options['notification_text']));
					}

$message = [
						'id' => 0,
						'user_id_to' => $receiver->id,
						'subject' => sprintf($lang->_('PLG_WORKFLOW_NOTIFICATION_ON_TRANSITION_SUBJECT'), $modelName),
						'message' => $messageText,
					];

$model_message->save($message);
				}
			}
		}

$this->app->enqueueMessage(Text::_('PLG_WORKFLOW_NOTIFICATION_SENT'), 'message');

}

/**
	 * Get user_ids of receivers
	 *
	 * @param   object  $data  Object containing data about the transition
	 *
	 * @return   array  $userIds  The receivers
	 *
	 * @since   4.0.0
	 */
	private function getUsersFromGroup($data): array
	{
		$users = [];

// Single userIds
		if (!empty($data->options['notification_receivers']))
		{
			$users = ArrayHelper::toInteger($data->options['notification_receivers']);
		}

// Usergroups
		$groups = [];

if (!empty($data->options['notification_groups']))
		{
			$groups = ArrayHelper::toInteger($data->options['notification_groups']);
		}

$users2 = [];

if (!empty($groups))
		{
			// UserIds from usergroups
			$model = Factory::getApplication()->bootComponent('com_users')
				->getMVCFactory()->createModel('Users', 'Administrator', ['ignore_request' => true]);

$model->setState('list.select', 'id');
			$model->setState('filter.groups', $groups);
			$model->setState('filter.state', 0);

// Ids from usergroups
			$groupUsers = $model->getItems();

$users2 = ArrayHelper::getColumn($groupUsers, 'id');
		}

// Merge userIds from individual entries and userIDs from groups
		return array_unique(array_merge($users, $users2));
	}

/**
	 * Check if the current plugin should execute workflow related activities
	 *
	 * @param   string  $context
	 *
	 * @return   boolean
	 *
	 * @since   4.0.0
	 */
	protected function isSupported($context)
	{
		if (!$this->checkAllowedAndForbiddenlist($context))
		{
			return false;
		}

$parts = explode('.', $context);

// We need at least the extension + view for loading the table fields
		if (count($parts) < 2)
		{
			return false;
		}

$component = $this->app->bootComponent($parts[0]);

if (!$component instanceof WorkflowServiceInterface
			|| !$component->isWorkflowActive($context))
		{
			return false;
		}

return true;
	}

/**
	 * Remove receivers who have locked their message inputbox
	 *
	 * @param   array  $userIds  The userIds which must be checked
	 *
	 * @return   array  users with active message input box
	 *
	 * @since   4.0.0
	 */
	private function removeLocked(array $userIds): array
	{
		if (empty($userIds))
		{
			return [];
		}

// Check for locked inboxes would be better to have _cdf settings in the user_object or a filter in users model
		$query = $this->db->getQuery(true);

$query->select($this->db->quoteName('user_id'))
			->from($this->db->quoteName('#__messages_cfg'))
			->whereIn($this->db->quoteName('user_id'), $userIds)
			->where($this->db->quoteName('cfg_name') . ' = ' . $this->db->quote('locked'))
			->where($this->db->quoteName('cfg_value') . ' = 1');

$locked = $this->db->setQuery($query)->loadColumn();

return array_diff($userIds, $locked);
	}
}