<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_tags
 *
 * @copyright   Copyright (C) 2005 - 2016 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;

/**
 * HTML View class for the Tags component
 *
 * @since  3.1
 */
class TagsViewTag extends JViewLegacy
{
	protected $state;

	protected $items;

	protected $item;

	protected $children;

	protected $pagination;

	protected $params;

	protected $tags_title;

	/**
	 * Execute and display a template script.
	 *
	 * @param   string  $tpl  The name of the template file to parse; automatically searches through the template paths.
	 *
	 * @return  mixed  A string if successful, otherwise an Error object.
	 *
	 * @since   3.1
	 */
	public function display($tpl = null)
	{
		$app    = JFactory::getApplication();
		$params = $app->getParams();

		// Get some data from the models
		$state      = $this->get('State');
		$items      = $this->get('Items');
		$item       = $this->get('Item');
		$children   = $this->get('Children');
		$parent     = $this->get('Parent');
		$pagination = $this->get('Pagination');

		/*
		 * // Change to catch
		 * if (count($errors = $this->get('Errors'))) {
		 * JError::raiseError(500, implode("\n", $errors));
		 * return false;
		 */

		// Check whether access level allows access.
		// @TODO: Should already be computed in $item->params->get('access-view')
		$user   = JFactory::getUser();
		$groups = $user->getAuthorisedViewLevels();

		foreach ($item as $itemElement)
		{
			if (!in_array($itemElement->access, $groups))
			{
				unset($itemElement);
			}

			// Prepare the data.
			if (!empty($itemElement))
			{
				$temp = new Registry;
				$temp->loadString($itemElement->params);
				$itemElement->params = clone $params;
				$itemElement->params->merge($temp);
				$itemElement->params = (array) json_decode($itemElement->params);
			}
		}

		if ($items !== false)
		{
			foreach ($items as $itemElement)
			{
				$itemElement->event = new stdClass;

				// For some plugins.
				!empty($itemElement->core_body)? $itemElement->text = $itemElement->core_body : $itemElement->text = null;

				$dispatcher = JEventDispatcher::getInstance();

				JPluginHelper::importPlugin('content');
				$dispatcher->trigger('onContentPrepare', array ('com_tags.tag', &$itemElement, &$itemElement->core_params, 0));

				$results = $dispatcher->trigger('onContentAfterTitle', array('com_tags.tag', &$itemElement, &$itemElement->core_params, 0));
				$itemElement->event->afterDisplayTitle = trim(implode("\n", $results));

				$results = $dispatcher->trigger('onContentBeforeDisplay', array('com_tags.tag', &$itemElement, &$itemElement->core_params, 0));
				$itemElement->event->beforeDisplayContent = trim(implode("\n", $results));

				$results = $dispatcher->trigger('onContentAfterDisplay', array('com_tags.tag', &$itemElement, &$itemElement->core_params, 0));
				$itemElement->event->afterDisplayContent = trim(implode("\n", $results));

				// Write the results back into the body
				if (!empty($itemElement->core_body))
				{
					$itemElement->core_body = $itemElement->text;
				}
			}
		}

		$this->state      = $state;
		$this->items      = $items;
		$this->children   = $children;
		$this->parent     = $parent;
		$this->pagination = $pagination;
		$this->user       = $user;
		$this->item       = $item;

		// Escape strings for HTML output
		$this->pageclass_sfx = htmlspecialchars($params->get('pageclass_sfx'));

		// Merge tag params. If this is single-tag view, menu params override tag params
		// Otherwise, article params override menu item params
		$this->params = $this->state->get('params');
		$active       = $app->getMenu()->getActive();
		$temp         = clone $this->params;

		// Check to see which parameters should take priority
		if ($active)
		{
			$currentLink = $active->link;

			// If the current view is the active item and an tag view for one tag, then the menu item params take priority
			if (strpos($currentLink, 'view=tag') && (strpos($currentLink, '&id[0]=' . (string) $item[0]->id)))
			{
				// $item->params are the article params, $temp are the menu item params
				// Merge so that the menu item params take priority
				$this->params->merge($temp);

				// Load layout from active query (in case it is an alternative menu item)
				if (isset($active->query['layout']))
				{
					$this->setLayout($active->query['layout']);
				}
			}
			else
			{
				// Current view is not tags, so the global params take priority since tags is not an item.
				// Merge the menu item params with the global params so that the article params take priority
				$temp->merge($this->state->params);
				$this->params = $temp;

				// Check for alternative layouts (since we are not in a single-article menu item)
				// Single-article menu item layout takes priority over alt layout for an article
				if ($layout = $this->params->get('tags_layout'))
				{
					$this->setLayout($layout);
				}
			}
		}
		else
		{
			// Merge so that item params take priority
			$temp->merge($item[0]->params);
			$item[0]->params = $temp;

			// Check for alternative layouts (since we are not in a single-tag menu item)
			// Single-tag menu item layout takes priority over alt layout for an article
			if ($layout = $item[0]->params->get('tag_layout'))
			{
				$this->setLayout($layout);
			}
		}

		// Increment the hit counter
		$model = $this->getModel();
		$model->hit();

		$this->_prepareDocument();

		parent::display($tpl);
	}

	/**
	 * Prepares the document.
	 *
	 * @return void
	 */
	protected function _prepareDocument()
	{
		$app   = JFactory::getApplication();
		$menus = $app->getMenu();
		$title = null;

		// Generate the tags title to use for page title, page heading and show tags title option
		$this->tags_title = $this->getTagsTitle();

		// Because the application sets a default page title,
		// we need to get it from the menu item itself
		$menu = $menus->getActive();

		if ($menu)
		{
			$this->params->def('page_heading', $this->params->get('page_title', $menu->title));
			$title = $this->params->get('page_title', $menu->title);

			if ($menu->query['option'] != 'com_tags')
			{
				$this->params->set('page_subheading', $menu->title);
			}
		}
		else
		{
			$this->params->def('page_heading', $this->tags_title);
			$title = $this->tags_title;
		}

		if (empty($title))
		{
			$title = $app->get('sitename');
		}
		elseif ($app->get('sitename_pagetitles', 0) == 1)
		{
			$title = JText::sprintf('JPAGETITLE', $app->get('sitename'), $title);
		}
		elseif ($app->get('sitename_pagetitles', 0) == 2)
		{
			$title = JText::sprintf('JPAGETITLE', $title, $app->get('sitename'));
		}

		$this->document->setTitle($title);

		foreach ($this->item as $itemElement)
		{
			if ($itemElement->metadesc)
			{
				$this->document->setDescription($itemElement->metadesc);
			}
			elseif ($this->params->get('menu-meta_description'))
			{
				$this->document->setDescription($this->params->get('menu-meta_description'));
			}

			if ($itemElement->metakey)
			{
				$this->document->setMetadata('keywords', $itemElement->metakey);
			}
			elseif ($this->params->get('menu-meta_keywords'))
			{
				$this->document->setMetadata('keywords', $this->params->get('menu-meta_keywords'));
			}

			if ($this->params->get('robots'))
			{
				$this->document->setMetadata('robots', $this->params->get('robots'));
			}
		}

		// @TODO: create tag feed document
		// Add alternative feed link

		if ($this->params->get('show_feed_link', 1) == 1)
		{
			$link    = '&format=feed&limitstart=';
			$attribs = array('type' => 'application/rss+xml', 'title' => 'RSS 2.0');
			$this->document->addHeadLink(JRoute::_($link . '&type=rss'), 'alternate', 'rel', $attribs);
			$attribs = array('type' => 'application/atom+xml', 'title' => 'Atom 1.0');
			$this->document->addHeadLink(JRoute::_($link . '&type=atom'), 'alternate', 'rel', $attribs);
		}
	}

	/**
	 * Creates the tags title for the output
	 *
	 * @return bool
	 */
	protected function getTagsTitle()
	{
		$tags_title = array();

		if (!empty($this->item))
		{
			$user   = JFactory::getUser();
			$groups = $user->getAuthorisedViewLevels();

			foreach ($this->item as $item)
			{
				if (in_array($item->access, $groups))
				{
					$tags_title[] = $item->title;
				}
			}
		}

		return implode(' ', $tags_title);
	}
}
