<?php
/**
 * Display the sitemap
 */

namespace MarkNotes\Plugins\Task\Sitemap;

defined('_MARKNOTES') or die('No direct access allowed');

class Get extends \MarkNotes\Plugins\Task\Plugin
{
	protected static $me = __CLASS__;
	protected static $json_settings = 'plugins.task.sitemap';
	protected static $json_options = 'plugins.options.task.sitemap';

	/**
	 * Get the list of notes, relies on the listFiles task plugin
	 * for this in order to, among other things, be sure that only
	 * files that the user can access are retrieved and not
	 * confidential ones
	 */
	private static function getFiles() : array
	{
		$arrFiles = [];

		// Call the listfiles.get event and initialize $arrFiles
		$aeEvents = \MarkNotes\Events::getInstance();
		$args = [&$arrFiles];
		$aeEvents->loadPlugins('task.listfiles.get');
		$aeEvents->trigger('task.listfiles.get::run', $args);

		return $args[0];
	}

	private static function url_encode(string $url) : string
	{
		$url = str_replace('&', '%26', $url);
		$url = str_replace(' ', '%20', $url);

		return $url;
	}

	private static function doGetSitemap() : string
	{
		$aeFiles = \MarkNotes\Files::getInstance();
		$aeFunctions = \MarkNotes\Functions::getInstance();
		$aeSettings = \MarkNotes\Settings::getInstance();

		$arrFiles = self::getFiles();

		$xml = '';

		$folder = str_replace('/', DS, $aeSettings->getFolderDocs(true));

		foreach ($arrFiles as $file) {
			$relFileName = str_replace($folder, '', $file);

			$url = rtrim($aeFunctions->getCurrentURL(), '/') . '/' . rtrim($aeSettings->getFolderDocs(false), DS) . '/';

			$urlHTML = $url . str_replace(DS, '/', $aeFiles->replaceExtension($relFileName, 'html'));

			$lastModified = @filemtime($file);

			$xml .=
				'	  <url>' . PHP_EOL .
				'		 <loc>' . self::url_encode($urlHTML) . '</loc>' . PHP_EOL .
				'		 <lastmod>' . date('Y-m-d\TH:i:sP', $lastModified) . '</lastmod>' . PHP_EOL .
				'		 <changefreq>weekly</changefreq>' . PHP_EOL .
				'		 <priority>1.0</priority>' . PHP_EOL .
				'	  </url>' . PHP_EOL;
		} // foreach

		$xml =
			'<?xml version="1.0" encoding="UTF-8"?>' . PHP_EOL .
			'<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ' .
				'xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" ' .
				'xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . PHP_EOL .
			'	' . $xml . PHP_EOL .
			'</urlset>';

		return $xml;
	}

	public static function run(&$params = null) : bool
	{
		if (self::isEnabled(true)) {
			$aeFiles = \MarkNotes\Files::getInstance();
			$aeFunctions = \MarkNotes\Functions::getInstance();
			$aeSession = \MarkNotes\Session::getInstance();
			$aeSettings = \MarkNotes\Settings::getInstance();

			$arr = null;

			$arrSettings = $aeSettings->getPlugins(JSON_OPTIONS_CACHE);
			$bCache = $arrSettings['enabled'] ?? false;

			/*<!-- build:debug -->*/
			if ($aeSettings->getDebugMode()) {
				$aeDebug = \MarkNotes\Debug::getInstance();
				$aeDebug->log('Get the sitemap', 'debug');
			}
			/*<!-- endbuild -->*/

			if ($bCache) {
				$aeCache = \MarkNotes\Cache::getInstance();

				// The list of files can vary from one user to an
				// another so we need to use his username
				$key = $aeSession->getUser() . '###sitemap';

				$cached = $aeCache->getItem(md5($key));
				$arr = $cached->get();
			}

			if (is_null($arr)) {
				$arr['xml'] = self::doGetSitemap();

				if ($bCache) {
					// Save the list in the cache
					$arr['from_cache'] = 1;
					// Default : 7 days.
					$duration = $arrSettings['duration']['sitemap'];
					$cached->set($arr)->expiresAfter($duration)->addTags(md5('listfiles'));
					$aeCache->save($cached);
					$arr['from_cache'] = 0;
				}
			} else {
				/*<!-- build:debug -->*/
				if ($aeSettings->getDebugMode()) {
					$aeDebug->log('	Retrieving from the cache', 'debug');
				}
				/*<!-- endbuild -->*/
			} // if (is_null($arr))

			// Nothing should be returned, the xml can be displayed immediatly
			header('Content-Type: application/xml; charset=utf-8');
			echo $arr['xml'];
		} else {
			header('HTTP/1.0 404 Not Found');
			exit();
		}

		return true;
	}
}
