<?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;

/**
 * Categories Component Categories Model
 *
 * @since  1.6
 */
class CategoriesModelCategories extends JModelList
{
	/**
	 * Constructor.
	 *
	 * @param   array  $config  An optional associative array of configuration settings.
	 *
	 * @see     JController
	 * @since   1.6
	 */
	public function __construct($config = array())
	{
		if (empty($config['filter_fields']))
		{
			$config['filter_fields'] = array(
				'id', 'a.id',
				'title', 'a.title',
				'alias', 'a.alias',
				'published', 'a.published',
				'access', 'a.access', 'access_level',
				'language', 'a.language',
				'checked_out', 'a.checked_out',
				'checked_out_time', 'a.checked_out_time',
				'created_time', 'a.created_time',
				'created_user_id', 'a.created_user_id',
				'lft', 'a.lft',
				'rgt', 'a.rgt',
				'level', 'a.level',
				'path', 'a.path',
				'tag'
			);
		}

		parent::__construct($config);
	}

	/**
	 * Method to auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @param   string  $ordering   An optional ordering field.
	 * @param   string  $direction  An optional direction (asc|desc).
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function populateState($ordering = null, $direction = null)
	{
		$app = JFactory::getApplication();
		$context = $this->context;

		$extension = $app->getUserStateFromRequest('com_categories.categories.filter.extension', 'extension', 'com_content', 'cmd');

		$this->setState('filter.extension', $extension);
		$parts = explode('.', $extension);

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

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

		$search = $this->getUserStateFromRequest($context . '.search', 'filter_search');
		$this->setState('filter.search', $search);

		$level = $this->getUserStateFromRequest($context . '.filter.level', 'filter_level');
		$this->setState('filter.level', $level);

		$access = $this->getUserStateFromRequest($context . '.filter.access', 'filter_access');
		$this->setState('filter.access', $access);

		$published = $this->getUserStateFromRequest($context . '.filter.published', 'filter_published', '');
		$this->setState('filter.published', $published);

		$language = $this->getUserStateFromRequest($context . '.filter.language', 'filter_language', '');
		$this->setState('filter.language', $language);

		$tag = $this->getUserStateFromRequest($this->context . '.filter.tag', 'filter_tag', '');
		$this->setState('filter.tag', $tag);

		// List state information.
		parent::populateState('a.lft', 'asc');

		// Force a language
		$forcedLanguage = $app->input->get('forcedLanguage');

		if (!empty($forcedLanguage))
		{
			$this->setState('filter.language', $forcedLanguage);
			$this->setState('filter.forcedLanguage', $forcedLanguage);
		}
	}

	/**
	 * Method to get a store id based on model configuration state.
	 *
	 * This is necessary because the model is used by the component and
	 * different modules that might need different sets of data or different
	 * ordering requirements.
	 *
	 * @param   string  $id  A prefix for the store id.
	 *
	 * @return  string  A store id.
	 *
	 * @since   1.6
	 */
	protected function getStoreId($id = '')
	{
		// Compile the store id.
		$id .= ':' . $this->getState('filter.search');
		$id .= ':' . $this->getState('filter.extension');
		$id .= ':' . $this->getState('filter.published');
		$id .= ':' . $this->getState('filter.language');

		return parent::getStoreId($id);
	}

	/**
	 * Method to get a database query to list categories.
	 *
	 * @return  JDatabaseQuery object.
	 *
	 * @since   1.6
	 */
	protected function getListQuery()
	{
		// Create a new query object.
		$db = $this->getDbo();
		$query = $db->getQuery(true);
		$user = JFactory::getUser();

		// Select the required fields from the table.
		$query->select(
			$this->getState(
				'list.select',
				'a.id, a.title, a.alias, a.note, a.published, a.access' .
				', a.checked_out, a.checked_out_time, a.created_user_id' .
				', a.path, a.parent_id, a.level, a.lft, a.rgt' .
				', a.language'
			)
		);
		$query->from('#__categories AS a');

		// Join over the language
		$query->select('l.title AS language_title')
			->join('LEFT', $db->quoteName('#__languages') . ' AS l ON l.lang_code = a.language');

		// Join over the users for the checked out user.
		$query->select('uc.name AS editor')
			->join('LEFT', '#__users AS uc ON uc.id=a.checked_out');

		// Join over the asset groups.
		$query->select('ag.title AS access_level')
			->join('LEFT', '#__viewlevels AS ag ON ag.id = a.access');

		// Join over the users for the author.
		$query->select('ua.name AS author_name')
			->join('LEFT', '#__users AS ua ON ua.id = a.created_user_id');

		// Join over the associations.
		$assoc = $this->getAssoc();

		if ($assoc)
		{
			$query->select('COUNT(asso2.id)>1 as association')
				->join('LEFT', '#__associations AS asso ON asso.id = a.id AND asso.context=' . $db->quote('com_categories.item'))
				->join('LEFT', '#__associations AS asso2 ON asso2.key = asso.key')
				->group('a.id, l.title, uc.name, ag.title, ua.name');
		}

		// Filter by extension
		if ($extension = $this->getState('filter.extension'))
		{
			$query->where('a.extension = ' . $db->quote($extension));
		}

		// Filter on the level.
		if ($level = $this->getState('filter.level'))
		{
			$query->where('a.level <= ' . (int) $level);
		}

		// Filter by access level.
		if ($access = $this->getState('filter.access'))
		{
			$query->where('a.access = ' . (int) $access);
		}

		// Implement View Level Access
		if (!$user->authorise('core.admin'))
		{
			$groups = implode(',', $user->getAuthorisedViewLevels());
			$query->where('a.access IN (' . $groups . ')');
		}

		// Filter by published state
		$published = $this->getState('filter.published');

		if (is_numeric($published))
		{
			$query->where('a.published = ' . (int) $published);
		}
		elseif ($published === '')
		{
			$query->where('(a.published IN (0, 1))');
		}

		// Filter by search in title
		$search = $this->getState('filter.search');

		if (!empty($search))
		{
			if (stripos($search, 'id:') === 0)
			{
				$query->where('a.id = ' . (int) substr($search, 3));
			}
			elseif (stripos($search, 'author:') === 0)
			{
				$search = $db->quote('%' . $db->escape(substr($search, 7), true) . '%');
				$query->where('(ua.name LIKE ' . $search . ' OR ua.username LIKE ' . $search . ')');
			}
			else
			{
				$search = $db->quote('%' . str_replace(' ', '%', $db->escape(trim($search), true) . '%'));
				$query->where('(a.title LIKE ' . $search . ' OR a.alias LIKE ' . $search . ' OR a.note LIKE ' . $search . ')');
			}
		}

		// Filter on the language.
		if ($language = $this->getState('filter.language'))
		{
			$query->where('a.language = ' . $db->quote($language));
		}

		// Filter by a single tag.
		$tagId = $this->getState('filter.tag');

		if (is_numeric($tagId))
		{
			$query->where($db->quoteName('tagmap.tag_id') . ' = ' . (int) $tagId)
				->join(
					'LEFT', $db->quoteName('#__contentitem_tag_map', 'tagmap')
					. ' ON ' . $db->quoteName('tagmap.content_item_id') . ' = ' . $db->quoteName('a.id')
					. ' AND ' . $db->quoteName('tagmap.type_alias') . ' = ' . $db->quote($extension . '.category')
				);
		}

		// Add the list ordering clause
		$listOrdering = $this->getState('list.ordering', 'a.lft');
		$listDirn = $db->escape($this->getState('list.direction', 'ASC'));

		if ($listOrdering == 'a.access')
		{
			$query->order('a.access ' . $listDirn . ', a.lft ' . $listDirn);
		}
		else
		{
			$query->order($db->escape($listOrdering) . ' ' . $listDirn);
		}

		return $query;
	}

	/**
	 * Method to determine if an association exists
	 *
	 * @return  boolean  True if the association exists
	 *
	 * @since  3.0
	 */

	public function getAssoc()
	{
		static $assoc = null;

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

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