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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Content.pagenavigation
 *
 * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Access\Access;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Component\Content\Site\Helper\RouteHelper;
use Joomla\Database\ParameterType;

/**
 * Pagenavigation plugin class.
 *
 * @since  1.5
 */
class PlgContentPagenavigation extends CMSPlugin
{
	/**
	 * If in the article view and the parameter is enabled shows the page navigation
	 *
	 * @param   string   $context  The context of the content being passed to the plugin
	 * @param   object   &$row     The article object
	 * @param   mixed    &$params  The article params
	 * @param   integer  $page     The 'page' number
	 *
	 * @return  mixed  void or true
	 *
	 * @since   1.6
	 */
	public function onContentBeforeDisplay($context, &$row, &$params, $page = 0)
	{
		$app   = Factory::getApplication();
		$view  = $app->input->get('view');
		$print = $app->input->getBool('print');

if ($print)
		{
			return false;
		}

if ($context === 'com_content.article' && $view === 'article' && $params->get('show_item_navigation'))
		{
			$db         = Factory::getDbo();
			$user       = Factory::getUser();
			$lang       = Factory::getLanguage();
			$now        = Factory::getDate()->toSql();
			$query      = $db->getQuery(true);
			$uid        = $row->id;
			$option     = 'com_content';
			$canPublish = $user->authorise('core.edit.state', $option . '.article.' . $row->id);

/**
			 * The following is needed as different menu items types utilise a different param to control ordering.
			 * For Blogs the `orderby_sec` param is the order controlling param.
			 * For Table and List views it is the `orderby` param.
			 */
			$params_list = $params->toArray();

if (array_key_exists('orderby_sec', $params_list))
			{
				$order_method = $params->get('orderby_sec', '');
			}
			else
			{
				$order_method = $params->get('orderby', '');
			}

// Additional check for invalid sort ordering.
			if ($order_method === 'front')
			{
				$order_method = '';
			}

if (in_array($order_method, ['date', 'rdate']))
			{
				// Get the order code
				$orderDate = $params->get('order_date');

switch ($orderDate)
				{
					// Use created if modified is not set
					case 'modified':
						$orderby = 'CASE WHEN ' . $db->quoteName('a.modified') . ' IS NULL THEN ' .
							$db->quoteName('a.created') . ' ELSE ' . $db->quoteName('a.modified') . ' END';
						break;

// Use created if publish_up is not set
					case 'published':
						$orderby = 'CASE WHEN ' . $db->quoteName('a.publish_up') . ' IS NULL THEN ' .
							$db->quoteName('a.created') . ' ELSE ' . $db->quoteName('a.publish_up') . ' END';
						break;

// Use created as default
					default :
						$orderby = $db->quoteName('a.created');
						break;
				}

if ($order_method === 'rdate')
				{
					$orderby .= ' DESC';
				}
			}
			else
			{
				// Determine sort order.
				switch ($order_method)
				{
					case 'alpha':
						$orderby = $db->quoteName('a.title');
						break;
					case 'ralpha':
						$orderby = $db->quoteName('a.title') . ' DESC';
						break;
					case 'hits':
						$orderby = $db->quoteName('a.hits');
						break;
					case 'rhits':
						$orderby = $db->quoteName('a.hits') . ' DESC';
						break;
					case 'author':
						$orderby = $db->quoteName(['a.created_by_alias', 'u.name']);
						break;
					case 'rauthor':
						$orderby = $db->quoteName('a.created_by_alias') . ' DESC, ' .
							$db->quoteName('u.name') . ' DESC';
						break;
					case 'front':
						$orderby = $db->quoteName('f.ordering');
						break;
					default:
						$orderby = $db->quoteName('a.ordering');
						break;
				}
			}

$query->order($orderby);

$case_when = ' CASE WHEN ' . $query->charLength($db->quoteName('a.alias'), '!=', '0')
				. ' THEN ' . $query->concatenate([$query->castAsChar($db->quoteName('a.id')), $db->quoteName('a.alias')], ':')
				. ' ELSE ' . $query->castAsChar('a.id') . ' END AS ' . $db->quoteName('slug');

$case_when1 = ' CASE WHEN ' . $query->charLength($db->quoteName('cc.alias'), '!=', '0')
				. ' THEN ' . $query->concatenate([$query->castAsChar($db->quoteName('cc.id')), $db->quoteName('cc.alias')], ':')
				. ' ELSE ' . $query->castAsChar('cc.id') . ' END AS ' . $db->quoteName('catslug');

$query->select($db->quoteName(['a.id', 'a.title', 'a.catid', 'a.language']))
				->select([$case_when, $case_when1])
				->from($db->quoteName('#__content', 'a'))
				->join('LEFT', $db->quoteName('#__categories', 'cc'), $db->quoteName('cc.id') . ' = ' . $db->quoteName('a.catid'));

if ($order_method === 'author' || $order_method === 'rauthor')
			{
				$query->select($db->quoteName(['a.created_by', 'u.name']));
				$query->join('LEFT', $db->quoteName('#__users', 'u'), $db->quoteName('u.id') . ' = ' . $db->quoteName('a.created_by'));
			}

$query->where(
				[
					$db->quoteName('a.catid') . ' = :catid',
					$db->quoteName('a.state') . ' = :state',
				]
			)
				->bind(':catid', $row->catid, ParameterType::INTEGER)
				->bind(':state', $row->state, ParameterType::INTEGER);

if (!$canPublish)
			{
				$query->whereIn($db->quoteName('a.access'), Access::getAuthorisedViewLevels($user->id));
			}

$query->where(
				[
					'(' . $db->quoteName('publish_up') . ' IS NULL OR ' . $db->quoteName('publish_up') . ' <= :nowDate1)',
					'(' . $db->quoteName('publish_down') . ' IS NULL OR ' . $db->quoteName('publish_down') . ' >= :nowDate2)',
				]
			)
				->bind(':nowDate1', $now)
				->bind(':nowDate2', $now);

if ($app->isClient('site') && $app->getLanguageFilter())
			{
				$query->whereIn($db->quoteName('a.language'), [$lang->getTag(), '*'], ParameterType::STRING);
			}

$db->setQuery($query);
			$list = $db->loadObjectList('id');

// This check needed if incorrect Itemid is given resulting in an incorrect result.
			if (!is_array($list))
			{
				$list = [];
			}

reset($list);

// Location of current content item in array list.
			$location = array_search($uid, array_keys($list));
			$rows     = array_values($list);

$row->prev = null;
			$row->next = null;

if ($location - 1 >= 0)
			{
				// The previous content item cannot be in the array position -1.
				$row->prev = $rows[$location - 1];
			}

if (($location + 1) < count($rows))
			{
				// The next content item cannot be in an array position greater than the number of array positions.
				$row->next = $rows[$location + 1];
			}

if ($row->prev)
			{
				$row->prev_label = ($this->params->get('display', 0) == 0) ? Text::_('JPREV') : $row->prev->title;
				$row->prev = RouteHelper::getArticleRoute($row->prev->slug, $row->prev->catid, $row->prev->language);
			}
			else
			{
				$row->prev_label = '';
				$row->prev = '';
			}

if ($row->next)
			{
				$row->next_label = ($this->params->get('display', 0) == 0) ? Text::_('JNEXT') : $row->next->title;
				$row->next = RouteHelper::getArticleRoute($row->next->slug, $row->next->catid, $row->next->language);
			}
			else
			{
				$row->next_label = '';
				$row->next = '';
			}

// Output.
			if ($row->prev || $row->next)
			{
				// Get the path for the layout file
				$path = PluginHelper::getLayoutPath('content', 'pagenavigation');

// Render the pagenav
				ob_start();
				include $path;
				$row->pagination = ob_get_clean();

$row->paginationposition = $this->params->get('position', 1);

// This will default to the 1.5 and 1.6-1.7 behavior.
				$row->paginationrelative = $this->params->get('relative', 0);
			}
		}
	}
}