<?php

/**
 * @copyright (C) 2013 iJoomla, Inc. - All rights reserved.
 * @license GNU General Public License, version 2 (http://www.gnu.org/licenses/gpl-2.0.html)
 * @author iJoomla.com <webmaster@ijoomla.com>
 * @url https://www.jomsocial.com/license-agreement
 * The PHP code portions are distributed under the GPL license. If not otherwise stated, all images, manuals, cascading style sheets, and included JavaScript *are NOT GPL, and are released under the IJOOMLA Proprietary Use License v1.0
 * More info at https://www.jomsocial.com/license-agreement
 */

use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Uri\Uri;

// no direct access
defined('_JEXEC') or die('Restricted access');

/* class exist checking */
if (!class_exists('CHeadHelper')) {

    /**
     * HTML head helper
     * This class provide method to set HTML head and opengraph metas
     * @since 3.0.1
     */
    class CHeadHelper {

        /**
         * Set page title
         * @param string $title
         */
        public static function setTitle($title) {
            $document = Factory::getDocument();
            $document->setTitle($title);
            self::addOpengraph('og:title', $title);
        }

        /**
         * Set page description
         * @param string $content
         */
        public static function setDescription($content) {
            if ($content !== '') {
                $document = Factory::getDocument();
                $document->setDescription($content);
                self::addOpengraph('og:description', $content);
            }
        }

        /**
         * Add Opengraph meta into head
         * @staticvar array $metas
         * @param string $property
         * @param string $content
         * @param boolean $isArray
         */
        public static function addOpengraph($property, $content, $isArray = false) {
            static $metas = array();
            $documentHTML = Factory::getDocument();

            $content = htmlentities($content);

            /* check if property already added */
            if (isset($metas[$property])) {
                /* only adding if it's array type */
                if ($isArray) {
                    $meta = '<meta property="' . $property . '" content="' . $content . '"/>';
                    $metas[$property][] = $meta;
                    $documentHTML->addCustomTag($meta);
                }
            } else { /* property is not exist than add it */
                $meta = '<meta property="' . $property . '" content="' . $content . '"/>';
                /* if this's array we'll store into array too */
                if ($isArray) {
                    $metas[$property][] = $meta;
                } else {
                    $metas[$property] = $meta;
                }
                $documentHTML->addCustomTag($meta);
            }
        }

        /**
         * Apply complete opengraph for a type
         * @param type $type
         * @param type $title
         * @param type $image
         */
        public static function setType($type, $title, $description = null, $images = null) {
            /**
             * We do get menu override title
             */
            $jinput = Factory::getApplication()->input;
            /* Get link for special toolbar items */
            if ($jinput->get('view') === 'memberlist')
                $activeLink = 'index.php?option=' . $jinput->get('option') . '&view=' . $jinput->get('view') . '&listid=' . $jinput->get('listid');
            $activeLink = 'index.php?option=' . $jinput->get('option') . '&view=' . $jinput->get('view');

            $model = CFactory::getModel('Toolbar');
            $active = $model->getActiveId($activeLink);
            $activeMenu = Factory::getApplication()->getMenu()->getItem($active);
            /* Fix for frontpage menu. If no valid activeMenu return than we use Joomla! getActive */
            if (is_null($activeMenu))
                $activeMenu = Factory::getApplication()->getMenu()->getActive();
            if (is_object($activeMenu)) {
                $menuParams = $activeMenu->getParams();
                $pageTitle = trim($menuParams->get('page_title', ''));
                if ($pageTitle != '') {
                    $title = $pageTitle . $title;
                }
                $menuDescription = trim($menuParams->get('menu-meta_description', ''));
                /**
                 * @todo Should we provide og:tags by keywords ?
                 */
            }

            // put joomla sitename to page title
            $globalConfig = Factory::getConfig();
            $title = Text::sprintf('COM_COMMUNITY_PAGE_TITLE', $title, $globalConfig->get('sitename'));

            // jomsocial page title must respected 'Site Name in Page Titles' (joomla global configuration)
            if (!empty($globalConfig->get('sitename'))) { 
                $trans = array("(" => "\(", ")" => "\)");
                $sitename = strtr(addslashes($globalConfig->get('sitename')), $trans);
                preg_match("/\s-\s" . $sitename . "$/i", $title, $titleMatch);

                if (isset($titleMatch[0])) {
                    if ($globalConfig->get('sitename_pagetitles') == 1) {
                        // set sitename at before
                        $title = $globalConfig->get('sitename') . ' - ' . str_replace($titleMatch[0], '', $title);
                    } else if ($globalConfig->get('sitename_pagetitles') == 2) {
                        // do nothing, sitename at after
                    } else {
                        // remore site name from page title
                        $title = str_replace($titleMatch[0], '', $title);
                    }
                }

            }
            self::addOpengraph('og:type', $type);
            self::addOpengraph('og:url', Uri::getInstance()->toString());
            self::addOpengraph('og:title', $title);
            /* Generate description if not provided */
            if ($description === null) {
                /* Use Joomla! global description if menu description is not provided */
                if (!isset($menuDescription) || $menuDescription == '') {
                    $description = Factory::getConfig()->get('MetaDesc', '');
                } else {
                    $description = $menuDescription;
                }
            }

            if (trim($description) != '') {
                self::addOpengraph('og:description', trim(strip_tags($description)));
            }
            if ($images !== null) {
                foreach ($images as $image) {
                    self::addOpengraph('og:image', $image, true);
                }
            }
            switch ($type) {
                /**
                 * @link https://developers.facebook.com/docs/reference/opengraph/object-type/website
                 */
                case 'website':
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=frontpage'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=groups'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=photos'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=videos'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=events'), true);
                    self::addOpengraph('og:site_name', Factory::getConfig()->get('sitename'));
                    break;
                /**
                 * @link https://developers.facebook.com/docs/reference/opengraph/object-type/profile/
                 */
                case 'profile':
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=frontpage'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=groups'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=photos'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=videos'), true);
                    self::addOpengraph('og:see_also', CRoute::getExternalURL('index.php?option=com_community&view=events'), true);
                    self::addOpengraph('og:site_name', Factory::getConfig()->get('sitename'));
                    break;
            }
            $document = Factory::getDocument();
            $document->setTitle(html_entity_decode($title));

            if($description)
                $document->setDescription(html_entity_decode($description));
        }

    }

}