<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_categories
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\Registry\Registry;

/**
 * Categories Component Category Model
 *
 * @since  1.6
 */
class CategoriesModelCategory extends JModelAdmin
{
	/**
	 * @var    string  The prefix to use with controller messages.
	 * @since  1.6
	 */
	protected $text_prefix = 'COM_CATEGORIES';

	/**
	 * The type alias for this content type. Used for content version history.
	 *
	 * @var      string
	 * @since    3.2
	 */
	public $typeAlias = null;

	/**
	 * Override parent constructor.
	 *
	 * @param   array  $config  An optional associative array of configuration settings.
	 *
	 * @see     JModelLegacy
	 * @since   3.2
	 */
	public function __construct($config = array())
	{
		parent::__construct($config);
		$extension = JFactory::getApplication()->input->get('extension', 'com_content');
		$this->typeAlias = $extension . '.category';
	}

	/**
	 * Method to test whether a record can be deleted.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to delete the record. Defaults to the permission set in the component.
	 *
	 * @since   1.6
	 */
	protected function canDelete($record)
	{
		if (!empty($record->id))
		{
			if ($record->published != -2)
			{
				return;
			}

			$user = JFactory::getUser();

			return $user->authorise('core.delete', $record->extension . '.category.' . (int) $record->id);
		}
	}

	/**
	 * Method to test whether a record can have its state changed.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to change the state of the record. Defaults to the permission set in the component.
	 *
	 * @since   1.6
	 */
	protected function canEditState($record)
	{
		$user = JFactory::getUser();

		// Check for existing category.
		if (!empty($record->id))
		{
			return $user->authorise('core.edit.state', $record->extension . '.category.' . (int) $record->id);
		}
		// New category, so check against the parent.
		elseif (!empty($record->parent_id))
		{
			return $user->authorise('core.edit.state', $record->extension . '.category.' . (int) $record->parent_id);
		}
		// Default to component settings if neither category nor parent known.
		else
		{
			return $user->authorise('core.edit.state', $record->extension);
		}
	}

	/**
	 * Method to get a table object, load it if necessary.
	 *
	 * @param   string  $type    The table name. Optional.
	 * @param   string  $prefix  The class prefix. Optional.
	 * @param   array   $config  Configuration array for model. Optional.
	 *
	 * @return  JTable  A JTable object
	 *
	 * @since   1.6
	 */
	public function getTable($type = 'Category', $prefix = 'CategoriesTable', $config = array())
	{
		return JTable::getInstance($type, $prefix, $config);
	}

	/**
	 * Auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function populateState()
	{
		$app = JFactory::getApplication('administrator');

		$parentId = $app->input->getInt('parent_id');
		$this->setState('category.parent_id', $parentId);

		// Load the User state.
		$pk = $app->input->getInt('id');
		$this->setState($this->getName() . '.id', $pk);

		$extension = $app->input->get('extension', 'com_content');
		$this->setState('category.extension', $extension);
		$parts = explode('.', $extension);

		// Extract the component name
		$this->setState('category.component', $parts[0]);

		// Extract the optional section name
		$this->setState('category.section', (count($parts) > 1) ? $parts[1] : null);

		// Load the parameters.
		$params = JComponentHelper::getParams('com_categories');
		$this->setState('params', $params);
	}

	/**
	 * Method to get a category.
	 *
	 * @param   integer  $pk  An optional id of the object to get, otherwise the id from the model state is used.
	 *
	 * @return  mixed    Category data object on success, false on failure.
	 *
	 * @since   1.6
	 */
	public function getItem($pk = null)
	{
		if ($result = parent::getItem($pk))
		{
			// Prime required properties.
			if (empty($result->id))
			{
				$result->parent_id = $this->getState('category.parent_id');
				$result->extension = $this->getState('category.extension');
			}

			// Convert the metadata field to an array.
			$registry = new Registry;
			$registry->loadString($result->metadata);
			$result->metadata = $registry->toArray();

			// Convert the created and modified dates to local user time for display in the form.
			$tz = new DateTimeZone(JFactory::getApplication()->get('offset'));

			if ((int) $result->created_time)
			{
				$date = new JDate($result->created_time);
				$date->setTimezone($tz);
				$result->created_time = $date->toSql(true);
			}
			else
			{
				$result->created_time = null;
			}

			if ((int) $result->modified_time)
			{
				$date = new JDate($result->modified_time);
				$date->setTimezone($tz);
				$result->modified_time = $date->toSql(true);
			}
			else
			{
				$result->modified_time = null;
			}

			if (!empty($result->id))
			{
				$result->tags = new JHelperTags;
				$result->tags->getTagIds($result->id, $result->extension . '.category');
			}
		}

		$assoc = $this->getAssoc();

		if ($assoc)
		{
			if ($result->id != null)
			{
				$result->associations = CategoriesHelper::getAssociations($result->id, $result->extension);
				JArrayHelper::toInteger($result->associations);
			}
			else
			{
				$result->associations = array();
			}
		}

		return $result;
	}

	/**
	 * Method to get the row form.
	 *
	 * @param   array    $data      Data for the form.
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not.
	 *
	 * @return  mixed    A JForm object on success, false on failure
	 *
	 * @since   1.6
	 */
	public function getForm($data = array(), $loadData = true)
	{
		$extension = $this->getState('category.extension');
		$jinput = JFactory::getApplication()->input;

		// A workaround to get the extension into the model for save requests.
		if (empty($extension) && isset($data['extension']))
		{
			$extension = $data['extension'];
			$parts = explode('.', $extension);

			$this->setState('category.extension', $extension);
			$this->setState('category.component', $parts[0]);
			$this->setState('category.section', @$parts[1]);
		}

		// Get the form.
		$form = $this->loadForm('com_categories.category' . $extension, 'category', array('control' => 'jform', 'load_data' => $loadData));

		if (empty($form))
		{
			return false;
		}

		// Modify the form based on Edit State access controls.
		if (empty($data['extension']))
		{
			$data['extension'] = $extension;
		}

		$user = JFactory::getUser();

		if (!$user->authorise('core.edit.state', $extension . '.category.' . $jinput->get('id')))
		{
			// Disable fields for display.
			$form->setFieldAttribute('ordering', 'disabled', 'true');
			$form->setFieldAttribute('published', 'disabled', 'true');

			// Disable fields while saving.
			// The controller has already verified this is a record you can edit.
			$form->setFieldAttribute('ordering', 'filter', 'unset');
			$form->setFieldAttribute('published', 'filter', 'unset');
		}

		return $form;
	}

	/**
	 * A protected method to get the where clause for the reorder
	 * This ensures that the row will be moved relative to a row with the same extension
	 *
	 * @param   JCategoryTable  $table  Current table instance
	 *
	 * @return  array           An array of conditions to add to add to ordering queries.
	 *
	 * @since   1.6
	 */
	protected function getReorderConditions($table)
	{
		return 'extension = ' . $this->_db->quote($table->extension);
	}

	/**
	 * Method to get the data that should be injected in the form.
	 *
	 * @return  mixed  The data for the form.
	 *
	 * @since   1.6
	 */
	protected function loadFormData()
	{
		// Check the session for previously entered form data.
		$data = JFactory::getApplication()->getUserState('com_categories.edit.' . $this->getName() . '.data', array());

		if (empty($data))
		{
			$data = $this->getItem();
		}

		$this->preprocessData('com_categories.category', $data);

		return $data;
	}

	/**
	 * Method to preprocess the form.
	 *
	 * @param   JForm   $form   A JForm object.
	 * @param   mixed   $data   The data expected for the form.
	 * @param   string  $group  The name of the plugin group to import.
	 *
	 * @return  void
	 *
	 * @see     JFormField
	 * @since   1.6
	 * @throws  Exception if there is an error in the form event.
	 */
	protected function preprocessForm(JForm $form, $data, $group = 'content')
	{
		jimport('joomla.filesystem.path');

		$lang = JFactory::getLanguage();
		$component = $this->getState('category.component');
		$section = $this->getState('category.section');
		$extension = JFactory::getApplication()->input->get('extension', null);

		// Get the component form if it exists
		$name = 'category' . ($section ? ('.' . $section) : '');

		// Looking first in the component models/forms folder
		$path = JPath::clean(JPATH_ADMINISTRATOR . "/components/$component/models/forms/$name.xml");

		// Old way: looking in the component folder
		if (!file_exists($path))
		{
			$path = JPath::clean(JPATH_ADMINISTRATOR . "/components/$component/$name.xml");
		}

		if (file_exists($path))
		{
			$lang->load($component, JPATH_BASE, null, false, true);
			$lang->load($component, JPATH_BASE . '/components/' . $component, null, false, true);

			if (!$form->loadFile($path, false))
			{
				throw new Exception(JText::_('JERROR_LOADFILE_FAILED'));
			}
		}

		// Try to find the component helper.
		$eName = str_replace('com_', '', $component);
		$path = JPath::clean(JPATH_ADMINISTRATOR . "/components/$component/helpers/category.php");

		if (file_exists($path))
		{
			require_once $path;
			$cName = ucfirst($eName) . ucfirst($section) . 'HelperCategory';

			if (class_exists($cName) && is_callable(array($cName, 'onPrepareForm')))
			{
				$lang->load($component, JPATH_BASE, null, false, false)
					|| $lang->load($component, JPATH_BASE . '/components/' . $component, null, false, false)
					|| $lang->load($component, JPATH_BASE, $lang->getDefault(), false, false)
					|| $lang->load($component, JPATH_BASE . '/components/' . $component, $lang->getDefault(), false, false);
				call_user_func_array(array($cName, 'onPrepareForm'), array(&$form));

				// Check for an error.
				if ($form instanceof Exception)
				{
					$this->setError($form->getMessage());

					return false;
				}
			}
		}

		// Set the access control rules field component value.
		$form->setFieldAttribute('rules', 'component', $component);
		$form->setFieldAttribute('rules', 'section', $name);

		// Association category items
		$assoc = $this->getAssoc();

		if ($assoc)
		{
			$languages = JLanguageHelper::getLanguages('lang_code');
			$addform = new SimpleXMLElement('<form />');
			$fields = $addform->addChild('fields');
			$fields->addAttribute('name', 'associations');
			$fieldset = $fields->addChild('fieldset');
			$fieldset->addAttribute('name', 'item_associations');
			$fieldset->addAttribute('description', 'COM_CATEGORIES_ITEM_ASSOCIATIONS_FIELDSET_DESC');
			$add = false;

			foreach ($languages as $tag => $language)
			{
				if (empty($data->language) || $tag != $data->language)
				{
					$add = true;
					$field = $fieldset->addChild('field');
					$field->addAttribute('name', $tag);
					$field->addAttribute('type', 'modal_category');
					$field->addAttribute('language', $tag);
					$field->addAttribute('label', $language->title);
					$field->addAttribute('translate_label', 'false');
					$field->addAttribute('extension', $extension);
					$field->addAttribute('edit', 'true');
					$field->addAttribute('clear', 'true');
				}
			}

			if ($add)
			{
				$form->load($addform, false);
			}
		}

		// Trigger the default form events.
		parent::preprocessForm($form, $data, $group);
	}

	/**
	 * Method to save the form data.
	 *
	 * @param   array  $data  The form data.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.6
	 */
	public function save($data)
	{
		$dispatcher = JEventDispatcher::getInstance();
		$table      = $this->getTable();
		$input      = JFactory::getApplication()->input;
		$pk         = (!empty($data['id'])) ? $data['id'] : (int) $this->getState($this->getName() . '.id');
		$isNew      = true;
		$context    = $this->option . '.' . $this->name;

		if ((!empty($data['tags']) && $data['tags'][0] != ''))
		{
			$table->newTags = $data['tags'];
		}

		// Include the plugins for the save events.
		JPluginHelper::importPlugin($this->events_map['save']);

		// Load the row if saving an existing category.
		if ($pk > 0)
		{
			$table->load($pk);
			$isNew = false;
		}

		// Set the new parent id if parent id not matched OR while New/Save as Copy .
		if ($table->parent_id != $data['parent_id'] || $data['id'] == 0)
		{
			$table->setLocation($data['parent_id'], 'last-child');
		}

		// Alter the title for save as copy
		if ($input->get('task') == 'save2copy')
		{
			$origTable = clone $this->getTable();
			$origTable->load($input->getInt('id'));

			if ($data['title'] == $origTable->title)
			{
				list($title, $alias) = $this->generateNewTitle($data['parent_id'], $data['alias'], $data['title']);
				$data['title'] = $title;
				$data['alias'] = $alias;
			}
			else
			{
				if ($data['alias'] == $origTable->alias)
				{
					$data['alias'] = '';
				}
			}
			$data['published'] = 0;
		}

		// Bind the data.
		if (!$table->bind($data))
		{
			$this->setError($table->getError());

			return false;
		}

		// Bind the rules.
		if (isset($data['rules']))
		{
			$rules = new JAccessRules($data['rules']);
			$table->setRules($rules);
		}

		// Check the data.
		if (!$table->check())
		{
			$this->setError($table->getError());

			return false;
		}

		// Trigger the before save event.
		$result = $dispatcher->trigger($this->event_before_save, array($context, &$table, $isNew));

		if (in_array(false, $result, true))
		{
			$this->setError($table->getError());

			return false;
		}

		// Store the data.
		if (!$table->store())
		{
			$this->setError($table->getError());

			return false;
		}

		$assoc = $this->getAssoc();

		if ($assoc)
		{
			// Adding self to the association
			$associations = $data['associations'];

			foreach ($associations as $tag => $id)
			{
				if (empty($id))
				{
					unset($associations[$tag]);
				}
			}

			// Detecting all item menus
			$all_language = $table->language == '*';

			if ($all_language && !empty($associations))
			{
				JError::raiseNotice(403, JText::_('COM_CATEGORIES_ERROR_ALL_LANGUAGE_ASSOCIATED'));
			}

			$associations[$table->language] = $table->id;

			// Deleting old association for these items
			$db = JFactory::getDbo();
			$query = $db->getQuery(true)
				->delete('#__associations')
				->where($db->quoteName('context') . ' = ' . $db->quote('com_categories.item'))
				->where($db->quoteName('id') . ' IN (' . implode(',', $associations) . ')');
			$db->setQuery($query);
			$db->execute();

			if ($error = $db->getErrorMsg())
			{
				$this->setError($error);

				return false;
			}

			if (!$all_language && count($associations))
			{
				// Adding new association for these items
				$key = md5(json_encode($associations));
				$query->clear()
					->insert('#__associations');

				foreach ($associations as $id)
				{
					$query->values($id . ',' . $db->quote('com_categories.item') . ',' . $db->quote($key));
				}

				$db->setQuery($query);
				$db->execute();

				if ($error = $db->getErrorMsg())
				{
					$this->setError($error);

					return false;
				}
			}
		}

		// Trigger the after save event.
		$dispatcher->trigger($this->event_after_save, array($context, &$table, $isNew));

		// Rebuild the path for the category:
		if (!$table->rebuildPath($table->id))
		{
			$this->setError($table->getError());

			return false;
		}

		// Rebuild the paths of the category's children:
		if (!$table->rebuild($table->id, $table->lft, $table->level, $table->path))
		{
			$this->setError($table->getError());

			return false;
		}

		$this->setState($this->getName() . '.id', $table->id);

		// Clear the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Method to change the published state of one or more records.
	 *
	 * @param   array    &$pks   A list of the primary keys to change.
	 * @param   integer  $value  The value of the published state.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   2.5
	 */
	public function publish(&$pks, $value = 1)
	{
		if (parent::publish($pks, $value))
		{
			$dispatcher = JEventDispatcher::getInstance();
			$extension = JFactory::getApplication()->input->get('extension');

			// Include the content plugins for the change of category state event.
			JPluginHelper::importPlugin('content');

			// Trigger the onCategoryChangeState event.
			$dispatcher->trigger('onCategoryChangeState', array($extension, $pks, $value));

			return true;
		}
	}

	/**
	 * Method rebuild the entire nested set tree.
	 *
	 * @return  boolean  False on failure or error, true otherwise.
	 *
	 * @since   1.6
	 */
	public function rebuild()
	{
		// Get an instance of the table object.
		$table = $this->getTable();

		if (!$table->rebuild())
		{
			$this->setError($table->getError());

			return false;
		}

		// Clear the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Method to save the reordered nested set tree.
	 * First we save the new order values in the lft values of the changed ids.
	 * Then we invoke the table rebuild to implement the new ordering.
	 *
	 * @param   array    $idArray    An array of primary key ids.
	 * @param   integer  $lft_array  The lft value
	 *
	 * @return  boolean  False on failure or error, True otherwise
	 *
	 * @since   1.6
	 */
	public function saveorder($idArray = null, $lft_array = null)
	{
		// Get an instance of the table object.
		$table = $this->getTable();

		if (!$table->saveorder($idArray, $lft_array))
		{
			$this->setError($table->getError());

			return false;
		}

		// Clear the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Batch tag a list of categories.
	 *
	 * @param   integer  $value     The value of the new tag.
	 * @param   array    $pks       An array of row IDs.
	 * @param   array    $contexts  An array of item contexts.
	 *
	 * @return  boolean true if successful; false otherwise.
	 */
	protected function batchTag($value, $pks, $contexts)
	{
		// Set the variables
		$user = JFactory::getUser();
		$table = $this->getTable();

		foreach ($pks as $pk)
		{
			if ($user->authorise('core.edit', $contexts[$pk]))
			{
				$table->reset();
				$table->load($pk);
				$tags = array($value);

				/**
				 * @var  JTableObserverTags  $tagsObserver
				 */
				$tagsObserver = $table->getObserverOfClass('JTableObserverTags');
				$result = $tagsObserver->setNewTags($tags, false);

				if (!$result)
				{
					$this->setError($table->getError());

					return false;
				}
			}
			else
			{
				$this->setError(JText::_('JLIB_APPLICATION_ERROR_BATCH_CANNOT_EDIT'));

				return false;
			}
		}

		// Clean the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Batch copy categories to a new category.
	 *
	 * @param   integer  $value     The new category.
	 * @param   array    $pks       An array of row IDs.
	 * @param   array    $contexts  An array of item contexts.
	 *
	 * @return  mixed    An array of new IDs on success, boolean false on failure.
	 *
	 * @since   1.6
	 */
	protected function batchCopy($value, $pks, $contexts)
	{
		$type = new JUcmType;
		$this->type = $type->getTypeByAlias($this->typeAlias);

		// $value comes as {parent_id}.{extension}
		$parts = explode('.', $value);
		$parentId = (int) JArrayHelper::getValue($parts, 0, 1);

		$db = $this->getDbo();
		$extension = JFactory::getApplication()->input->get('extension', '', 'word');
		$newIds = array();

		// Check that the parent exists
		if ($parentId)
		{
			if (!$this->table->load($parentId))
			{
				if ($error = $this->table->getError())
				{
					// Fatal error
					$this->setError($error);

					return false;
				}
				else
				{
					// Non-fatal error
					$this->setError(JText::_('JGLOBAL_BATCH_MOVE_PARENT_NOT_FOUND'));
					$parentId = 0;
				}
			}

			// Check that user has create permission for parent category
			if ($parentId == $this->table->getRootId())
			{
				$canCreate = $this->user->authorise('core.create', $extension);
			}
			else
			{
				$canCreate = $this->user->authorise('core.create', $extension . '.category.' . $parentId);
			}

			if (!$canCreate)
			{
				// Error since user cannot create in parent category
				$this->setError(JText::_('COM_CATEGORIES_BATCH_CANNOT_CREATE'));

				return false;
			}
		}

		// If the parent is 0, set it to the ID of the root item in the tree
		if (empty($parentId))
		{
			if (!$parentId = $this->table->getRootId())
			{
				$this->setError($db->getErrorMsg());

				return false;
			}
			// Make sure we can create in root
			elseif (!$this->user->authorise('core.create', $extension))
			{
				$this->setError(JText::_('COM_CATEGORIES_BATCH_CANNOT_CREATE'));

				return false;
			}
		}

		// We need to log the parent ID
		$parents = array();

		// Calculate the emergency stop count as a precaution against a runaway loop bug
		$query = $db->getQuery(true)
			->select('COUNT(id)')
			->from($db->quoteName('#__categories'));
		$db->setQuery($query);

		try
		{
			$count = $db->loadResult();
		}
		catch (RuntimeException $e)
		{
			$this->setError($e->getMessage());

			return false;
		}

		// Parent exists so let's proceed
		while (!empty($pks) && $count > 0)
		{
			// Pop the first id off the stack
			$pk = array_shift($pks);

			$this->table->reset();

			// Check that the row actually exists
			if (!$this->table->load($pk))
			{
				if ($error = $this->table->getError())
				{
					// Fatal error
					$this->setError($error);

					return false;
				}
				else
				{
					// Not fatal error
					$this->setError(JText::sprintf('JGLOBAL_BATCH_MOVE_ROW_NOT_FOUND', $pk));
					continue;
				}
			}

			// Copy is a bit tricky, because we also need to copy the children
			$query->clear()
				->select('id')
				->from($db->quoteName('#__categories'))
				->where('lft > ' . (int) $this->table->lft)
				->where('rgt < ' . (int) $this->table->rgt);
			$db->setQuery($query);
			$childIds = $db->loadColumn();

			// Add child ID's to the array only if they aren't already there.
			foreach ($childIds as $childId)
			{
				if (!in_array($childId, $pks))
				{
					array_push($pks, $childId);
				}
			}

			// Make a copy of the old ID and Parent ID
			$oldId = $this->table->id;
			$oldParentId = $this->table->parent_id;

			// Reset the id because we are making a copy.
			$this->table->id = 0;

			// If we a copying children, the Old ID will turn up in the parents list
			// otherwise it's a new top level item
			$this->table->parent_id = isset($parents[$oldParentId]) ? $parents[$oldParentId] : $parentId;

			// Set the new location in the tree for the node.
			$this->table->setLocation($this->table->parent_id, 'last-child');

			// TODO: Deal with ordering?
			// $this->table->ordering	= 1;
			$this->table->level = null;
			$this->table->asset_id = null;
			$this->table->lft = null;
			$this->table->rgt = null;

			// Alter the title & alias
			list($title, $alias) = $this->generateNewTitle($this->table->parent_id, $this->table->alias, $this->table->title);
			$this->table->title = $title;
			$this->table->alias = $alias;

			// Unpublish because we are making a copy
			$this->table->published = 0;

			parent::createTagsHelper($this->tagsObserver, $this->type, $pk, $this->typeAlias, $this->table);

			// Store the row.
			if (!$this->table->store())
			{
				$this->setError($this->table->getError());

				return false;
			}

			// Get the new item ID
			$newId = $this->table->get('id');

			// Add the new ID to the array
			$newIds[$pk] = $newId;

			// Now we log the old 'parent' to the new 'parent'
			$parents[$oldId] = $this->table->id;
			$count--;
		}

		// Rebuild the hierarchy.
		if (!$this->table->rebuild())
		{
			$this->setError($this->table->getError());

			return false;
		}

		// Rebuild the tree path.
		if (!$this->table->rebuildPath($this->table->id))
		{
			$this->setError($this->table->getError());

			return false;
		}

		return $newIds;
	}

	/**
	 * Batch move categories to a new category.
	 *
	 * @param   integer  $value     The new category ID.
	 * @param   array    $pks       An array of row IDs.
	 * @param   array    $contexts  An array of item contexts.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.6
	 */
	protected function batchMove($value, $pks, $contexts)
	{
		$parentId = (int) $value;
		$type = new JUcmType;
		$this->type = $type->getTypeByAlias($this->typeAlias);

		$db = $this->getDbo();
		$query = $db->getQuery(true);
		$extension = JFactory::getApplication()->input->get('extension', '', 'word');

		// Check that the parent exists.
		if ($parentId)
		{
			if (!$this->table->load($parentId))
			{
				if ($error = $this->table->getError())
				{
					// Fatal error.
					$this->setError($error);

					return false;
				}
				else
				{
					// Non-fatal error.
					$this->setError(JText::_('JGLOBAL_BATCH_MOVE_PARENT_NOT_FOUND'));
					$parentId = 0;
				}
			}

			// Check that user has create permission for parent category.
			if ($parentId == $this->table->getRootId())
			{
				$canCreate = $this->user->authorise('core.create', $extension);
			}
			else
			{
				$canCreate = $this->user->authorise('core.create', $extension . '.category.' . $parentId);
			}

			if (!$canCreate)
			{
				// Error since user cannot create in parent category
				$this->setError(JText::_('COM_CATEGORIES_BATCH_CANNOT_CREATE'));

				return false;
			}

			// Check that user has edit permission for every category being moved
			// Note that the entire batch operation fails if any category lacks edit permission
			foreach ($pks as $pk)
			{
				if (!$this->user->authorise('core.edit', $extension . '.category.' . $pk))
				{
					// Error since user cannot edit this category
					$this->setError(JText::_('COM_CATEGORIES_BATCH_CANNOT_EDIT'));

					return false;
				}
			}
		}

		// We are going to store all the children and just move the category
		$children = array();

		// Parent exists so let's proceed
		foreach ($pks as $pk)
		{
			// Check that the row actually exists
			if (!$this->table->load($pk))
			{
				if ($error = $this->table->getError())
				{
					// Fatal error
					$this->setError($error);

					return false;
				}
				else
				{
					// Not fatal error
					$this->setError(JText::sprintf('JGLOBAL_BATCH_MOVE_ROW_NOT_FOUND', $pk));
					continue;
				}
			}

			// Set the new location in the tree for the node.
			$this->table->setLocation($parentId, 'last-child');

			// Check if we are moving to a different parent
			if ($parentId != $this->table->parent_id)
			{
				// Add the child node ids to the children array.
				$query->clear()
					->select('id')
					->from($db->quoteName('#__categories'))
					->where($db->quoteName('lft') . ' BETWEEN ' . (int) $this->table->lft . ' AND ' . (int) $this->table->rgt);
				$db->setQuery($query);

				try
				{
					$children = array_merge($children, (array) $db->loadColumn());
				}
				catch (RuntimeException $e)
				{
					$this->setError($e->getMessage());

					return false;
				}
			}

			parent::createTagsHelper($this->tagsObserver, $this->type, $pk, $this->typeAlias, $this->table);

			// Store the row.
			if (!$this->table->store())
			{
				$this->setError($this->table->getError());

				return false;
			}

			// Rebuild the tree path.
			if (!$this->table->rebuildPath())
			{
				$this->setError($this->table->getError());

				return false;
			}
		}

		// Process the child rows
		if (!empty($children))
		{
			// Remove any duplicates and sanitize ids.
			$children = array_unique($children);
			JArrayHelper::toInteger($children);
		}

		return true;
	}

	/**
	 * Custom clean the cache of com_content and content modules
	 *
	 * @param   string   $group      Cache group name.
	 * @param   integer  $client_id  Application client id.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function cleanCache($group = null, $client_id = 0)
	{
		$extension = JFactory::getApplication()->input->get('extension');

		switch ($extension)
		{
			case 'com_content':
				parent::cleanCache('com_content');
				parent::cleanCache('mod_articles_archive');
				parent::cleanCache('mod_articles_categories');
				parent::cleanCache('mod_articles_category');
				parent::cleanCache('mod_articles_latest');
				parent::cleanCache('mod_articles_news');
				parent::cleanCache('mod_articles_popular');
				break;
			default:
				parent::cleanCache($extension);
				break;
		}
	}

	/**
	 * Method to change the title & alias.
	 *
	 * @param   integer  $parent_id  The id of the parent.
	 * @param   string   $alias      The alias.
	 * @param   string   $title      The title.
	 *
	 * @return  array    Contains the modified title and alias.
	 *
	 * @since   1.7
	 */
	protected function generateNewTitle($parent_id, $alias, $title)
	{
		// Alter the title & alias
		$table = $this->getTable();

		while ($table->load(array('alias' => $alias, 'parent_id' => $parent_id)))
		{
			$title = JString::increment($title);
			$alias = JString::increment($alias, 'dash');
		}

		return array($title, $alias);
	}

	/**
	 * Method to determine if a category association is available.
	 *
	 * @return  boolean True if a category association is available; false otherwise.
	 */
	public function getAssoc()
	{
		static $assoc = null;

		if (!is_null($assoc))
		{
			return $assoc;
		}

		$app = JFactory::getApplication();
		$extension = $this->getState('category.extension');

		$assoc = JLanguageAssociations::isEnabled();
		$extension = explode('.', $extension);
		$component = array_shift($extension);
		$cname = str_replace('com_', '', $component);

		if (!$assoc || !$component || !$cname)
		{
			$assoc = false;
		}
		else
		{
			$hname = $cname . 'HelperAssociation';
			JLoader::register($hname, JPATH_SITE . '/components/' . $component . '/helpers/association.php');

			$assoc = class_exists($hname) && !empty($hname::$category_association);
		}

		return $assoc;
	}
}