<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\MVC\View;

use Joomla\CMS\Categories\CategoryNode;
use Joomla\CMS\Factory;
use Joomla\CMS\Helper\TagsHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\Router\Route;

/**
 * Base HTML View class for the a Category list
 *
 * @since  3.2
 */
class CategoryView extends HtmlView
{
    /**
     * State data
     *
     * @var    \Joomla\Registry\Registry
     * @since  3.2
     */
    protected $state;

    /**
     * Category items data
     *
     * @var    array
     * @since  3.2
     */
    protected $items;

    /**
     * The category model object for this category
     *
     * @var    CategoryNode
     * @since  3.2
     */
    protected $category;

    /**
     * The list of other categories for this extension.
     *
     * @var    array
     * @since  3.2
     */
    protected $categories;

    /**
     * Pagination object
     *
     * @var    \Joomla\CMS\Pagination\Pagination
     * @since  3.2
     */
    protected $pagination;

    /**
     * Child objects
     *
     * @var    array
     * @since  3.2
     */
    protected $children;

    /**
     * The name of the extension for the category
     *
     * @var    string
     * @since  3.2
     */
    protected $extension;

    /**
     * The name of the view to link individual items to
     *
     * @var    string
     * @since  3.2
     */
    protected $viewName;

    /**
     * Default title to use for page title
     *
     * @var    string
     * @since  3.2
     */
    protected $defaultPageTitle;

    /**
     * Whether to run the standard Joomla plugin events.
     * Off by default for b/c
     *
     * @var    boolean
     * @since  3.5
     */
    protected $runPlugins = false;

    /**
     * The flag to mark if the active menu item is linked to the category being displayed
     *
     * @var bool
     * @since 4.0.0
     */
    protected $menuItemMatchCategory = false;

    /**
     * Method with common display elements used in category list displays
     *
     * @return  void
     *
     * @since   3.2
     */
    public function commonCategoryDisplay()
    {
        $app    = Factory::getApplication();
        $user   = Factory::getUser();
        $params = $app->getParams();

        // Get some data from the models
        $model       = $this->getModel();
        $paramsModel = $model->getState('params');

        $paramsModel->set('check_access_rights', 0);
        $model->setState('params', $paramsModel);

        $state       = $this->get('State');
        $category    = $this->get('Category');
        $children    = $this->get('Children');
        $parent      = $this->get('Parent');

        if ($category == false) {
            throw new \InvalidArgumentException(Text::_('JGLOBAL_CATEGORY_NOT_FOUND'), 404);
        }

        if ($parent == false) {
            throw new \InvalidArgumentException(Text::_('JGLOBAL_CATEGORY_NOT_FOUND'), 404);
        }

        // Check whether category access level allows access.
        $groups = $user->getAuthorisedViewLevels();

        if (!\in_array($category->access, $groups)) {
            throw new \RuntimeException(Text::_('JERROR_ALERTNOAUTHOR'), 403);
        }

        $items      = $this->get('Items');
        $pagination = $this->get('Pagination');

        // Check for errors.
        if (\count($errors = $this->get('Errors'))) {
            throw new GenericDataException(implode("\n", $errors), 500);
        }

        // Setup the category parameters.
        $cparams          = $category->getParams();
        $category->params = clone $params;
        $category->params->merge($cparams);

        $children = array($category->id => $children);

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

        if ($this->runPlugins) {
            PluginHelper::importPlugin('content');

            foreach ($items as $itemElement) {
                $itemElement = (object) $itemElement;
                $itemElement->event = new \stdClass();

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

                Factory::getApplication()->triggerEvent('onContentPrepare', [$this->extension . '.category', &$itemElement, &$itemElement->params, 0]);

                $results = Factory::getApplication()->triggerEvent(
                    'onContentAfterTitle',
                    [$this->extension . '.category', &$itemElement, &$itemElement->core_params, 0]
                );
                $itemElement->event->afterDisplayTitle = trim(implode("\n", $results));

                $results = Factory::getApplication()->triggerEvent(
                    'onContentBeforeDisplay',
                    [$this->extension . '.category', &$itemElement, &$itemElement->core_params, 0]
                );
                $itemElement->event->beforeDisplayContent = trim(implode("\n", $results));

                $results = Factory::getApplication()->triggerEvent(
                    'onContentAfterDisplay',
                    [$this->extension . '.category', &$itemElement, &$itemElement->core_params, 0]
                );
                $itemElement->event->afterDisplayContent = trim(implode("\n", $results));

                if ($itemElement->text) {
                    $itemElement->description = $itemElement->text;
                }
            }
        }

        $maxLevel         = $params->get('maxLevel', -1) < 0 ? PHP_INT_MAX : $params->get('maxLevel', PHP_INT_MAX);
        $this->maxLevel   = &$maxLevel;
        $this->state      = &$state;
        $this->items      = &$items;
        $this->category   = &$category;
        $this->children   = &$children;
        $this->params     = &$params;
        $this->parent     = &$parent;
        $this->pagination = &$pagination;
        $this->user       = &$user;

        // Check for layout override only if this is not the active menu item
        // If it is the active menu item, then the view and category id will match
        $active = $app->getMenu()->getActive();

        if (
            $active
            && $active->component == $this->extension
            && isset($active->query['view'], $active->query['id'])
            && $active->query['view'] === 'category'
            && $active->query['id'] == $this->category->id
        ) {
            if (isset($active->query['layout'])) {
                $this->setLayout($active->query['layout']);
            }

            $this->menuItemMatchCategory = true;
        } elseif ($layout = $category->params->get('category_layout')) {
            $this->setLayout($layout);
        }

        $this->category->tags = new TagsHelper();
        $this->category->tags->getItemTags($this->extension . '.category', $this->category->id);
    }

    /**
     * Execute and display a template script.
     *
     * @param   string  $tpl  The name of the template file to parse; automatically searches through the template paths.
     *
     * @return  void
     *
     * @since   3.2
     * @throws  \Exception
     */
    public function display($tpl = null)
    {
        $this->prepareDocument();

        parent::display($tpl);
    }

    /**
     * Method to prepares the document
     *
     * @return  void
     *
     * @since   3.2
     */
    protected function prepareDocument()
    {
        $app           = Factory::getApplication();
        $this->pathway = $app->getPathway();

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

        if ($this->menu) {
            $this->params->def('page_heading', $this->params->get('page_title', $this->menu->title));
        } else {
            $this->params->def('page_heading', Text::_($this->defaultPageTitle));
        }

        $this->setDocumentTitle($this->params->get('page_title', ''));

        if ($this->params->get('menu-meta_description')) {
            $this->document->setDescription($this->params->get('menu-meta_description'));
        }

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

    /**
     * Method to add an alternative feed link to a category layout.
     *
     * @return  void
     *
     * @since   3.2
     */
    protected function addFeed()
    {
        if ($this->params->get('show_feed_link', 1) == 1) {
            $link    = '&format=feed&limitstart=';
            $attribs = array('type' => 'application/rss+xml', 'title' => 'RSS 2.0');
            $this->document->addHeadLink(Route::_($link . '&type=rss'), 'alternate', 'rel', $attribs);
            $attribs = array('type' => 'application/atom+xml', 'title' => 'Atom 1.0');
            $this->document->addHeadLink(Route::_($link . '&type=atom'), 'alternate', 'rel', $attribs);
        }
    }
}
