<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  User.joomla
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Joomla User plugin
 *
 * @package     Joomla.Plugin
 * @subpackage  User.joomla
 * @since       1.5
 */
class PlgUserJoomla extends JPlugin
{
	/**
	 * Remove all sessions for the user name
	 *
	 * Method is called after user data is deleted from the database
	 *
	 * @param   array          $user      Holds the user data
	 * @param   boolean        $succes    True if user was succesfully stored in the database
	 * @param   string         $msg       Message
	 *
	 * @return  boolean
	 * @since   1.6
	 */
	public function onUserAfterDelete($user, $succes, $msg)
	{
		if (!$succes)
		{
			return false;
		}

		$db = JFactory::getDbo();
		$db->setQuery(
			'DELETE FROM ' . $db->quoteName('#__session') .
				' WHERE ' . $db->quoteName('userid') . ' = ' . (int) $user['id']
		);
		$db->execute();

		return true;
	}

	/**
	 * Utility method to act on a user after it has been saved.
	 *
	 * This method sends a registration email to new users created in the backend.
	 *
	 * @param   array          $user         Holds the new user data.
	 * @param   boolean        $isnew        True if a new user is stored.
	 * @param   boolean        $success      True if user was succesfully stored in the database.
	 * @param   string         $msg          Message.
	 *
	 * @return  void
	 * @since   1.6
	 */
	public function onUserAfterSave($user, $isnew, $success, $msg)
	{
		$app = JFactory::getApplication();
		$config = JFactory::getConfig();
		$mail_to_user = $this->params->get('mail_to_user', 1);

		if ($isnew)
		{
			// TODO: Suck in the frontend registration emails here as well. Job for a rainy day.

			if ($app->isAdmin())
			{
				if ($mail_to_user)
				{

					// Load user_joomla plugin language (not done automatically).
					$lang = JFactory::getLanguage();
					$lang->load('plg_user_joomla', JPATH_ADMINISTRATOR);

					// Compute the mail subject.
					$emailSubject = JText::sprintf(
						'PLG_USER_JOOMLA_NEW_USER_EMAIL_SUBJECT',
						$user['name'],
						$config->get('sitename')
					);

					// Compute the mail body.
					$emailBody = JText::sprintf(
						'PLG_USER_JOOMLA_NEW_USER_EMAIL_BODY',
						$user['name'],
						$config->get('sitename'),
						JUri::root(),
						$user['username'],
						$user['password_clear']
					);

					// Assemble the email data...the sexy way!
					$mail = JFactory::getMailer()
						->setSender(
							array(
								$config->get('mailfrom'),
								$config->get('fromname')
							)
						)
						->addRecipient($user['email'])
						->setSubject($emailSubject)
						->setBody($emailBody);

					if (!$mail->Send())
					{
						// TODO: Probably should raise a plugin error but this event is not error checked.
						JError::raiseWarning(500, JText::_('ERROR_SENDING_EMAIL'));
					}
				}
			}
		}
		else
		{
			// Existing user - nothing to do...yet.
		}
	}

	/**
	 * This method should handle any login logic and report back to the subject
	 *
	 * @param   array  $user        Holds the user data
	 * @param   array  $options     Array holding options (remember, autoregister, group)
	 *
	 * @return  boolean  True on success
	 * @since   1.5
	 */
	public function onUserLogin($user, $options = array())
	{
		$instance = $this->_getUser($user, $options);

		// If _getUser returned an error, then pass it back.
		if ($instance instanceof Exception)
		{
			return false;
		}

		// If the user is blocked, redirect with an error
		if ($instance->get('block') == 1)
		{
			JError::raiseWarning('SOME_ERROR_CODE', JText::_('JERROR_NOLOGIN_BLOCKED'));
			return false;
		}

		// Authorise the user based on the group information
		if (!isset($options['group']))
		{
			$options['group'] = 'USERS';
		}

		// Check the user can login.
		$result = $instance->authorise($options['action']);
		if (!$result)
		{

			JError::raiseWarning(401, JText::_('JERROR_LOGIN_DENIED'));
			return false;
		}

		// Mark the user as logged in
		$instance->set('guest', 0);

		// Register the needed session variables
		$session = JFactory::getSession();
		$session->set('user', $instance);

		$db = JFactory::getDbo();

		// Check to see the the session already exists.
		$app = JFactory::getApplication();
		$app->checkSession();

		// Update the user related fields for the Joomla sessions table.
		$query = $db->getQuery(true)
			->update($db->quoteName('#__session'))
			->set($db->quoteName('guest') . ' = ' . $db->quote($instance->get('guest')))
			->set($db->quoteName('username') . ' = ' . $db->quote($instance->get('username')))
			->set($db->quoteName('userid') . ' = ' . (int) $instance->get('id'))
			->where($db->quoteName('session_id') . ' = ' . $db->quote($session->getId()));
		$db->setQuery($query);
		$db->execute();

		// Hit the user last visit field
		$instance->setLastVisit();

		return true;
	}

	/**
	 * This method should handle any logout logic and report back to the subject
	 *
	 * @param   array  $user        Holds the user data.
	 * @param   array  $options     Array holding options (client, ...).
	 *
	 * @return  object  True on success
	 * @since   1.5
	 */
	public function onUserLogout($user, $options = array())
	{
		$my = JFactory::getUser();
		$session = JFactory::getSession();
		$app = JFactory::getApplication();

		// Make sure we're a valid user first
		if ($user['id'] == 0 && !$my->get('tmp_user'))
		{
			return true;
		}

		// Check to see if we're deleting the current session
		if ($my->get('id') == $user['id'] && $options['clientid'] == $app->getClientId())
		{
			// Hit the user last visit field
			$my->setLastVisit();

			// Destroy the php session for this user
			$session->destroy();
		}

		// Force logout all users with that userid
		$db = JFactory::getDbo();
		$query = $db->getQuery(true)
			->delete($db->quoteName('#__session'))
			->where($db->quoteName('userid') . ' = ' . (int) $user['id'])
			->where($db->quoteName('client_id') . ' = ' . (int) $options['clientid']);
		$db->setQuery($query);
		$db->execute();

		return true;
	}

	/**
	 * This method will return a user object
	 *
	 * If options['autoregister'] is true, if the user doesn't exist yet he will be created
	 *
	 * @param   array  $user        Holds the user data.
	 * @param   array  $options     Array holding options (remember, autoregister, group).
	 *
	 * @return  object  A JUser object
	 * @since   1.5
	 */
	protected function _getUser($user, $options = array())
	{
		$instance = JUser::getInstance();
		$id = (int) JUserHelper::getUserId($user['username']);
		if ($id)
		{
			$instance->load($id);
			return $instance;
		}

		//TODO : move this out of the plugin
		$config = JComponentHelper::getParams('com_users');
		// Default to Registered.
		$defaultUserGroup = $config->get('new_usertype', 2);

		$instance->set('id', 0);
		$instance->set('name', $user['fullname']);
		$instance->set('username', $user['username']);
		$instance->set('password_clear', $user['password_clear']);
		// Result should contain an email (check)
		$instance->set('email', $user['email']);
		$instance->set('groups', array($defaultUserGroup));

		//If autoregister is set let's register the user
		$autoregister = isset($options['autoregister']) ? $options['autoregister'] : $this->params->get('autoregister', 1);

		if ($autoregister)
		{
			if (!$instance->save())
			{
				return JError::raiseWarning('SOME_ERROR_CODE', $instance->getError());
			}
		}
		else
		{
			// No existing user and autoregister off, this is a temporary user.
			$instance->set('tmp_user', true);
		}

		return $instance;
	}
}