<?php



/**

 * Loader class for the Google Sitemap Generator

 *

 * This class takes care of the sitemap plugin and tries to load the different parts as late as possible.

 * On normal requests, only this small class is loaded. When the sitemap needs to be rebuild, the generator itself is loaded.

 * The last stage is the user interface which is loaded when the administration page is requested.

 *

 * @author Arne Brachhold

 * @package sitemap

 */

class GoogleSitemapGeneratorLoader {



	/**

	 * @var string Version of the generator in SVN

	 */

	private static $svnVersion = '$Id: sitemap-loader.php 937300 2014-06-23 18:04:11Z arnee $';





	/**

	 * Enabled the sitemap plugin with registering all required hooks

	 *

	 * @uses add_action Adds actions for admin menu, executing pings and handling robots.txt

	 * @uses add_filter Adds filtes for admin menu icon and contexual help

	 * @uses GoogleSitemapGeneratorLoader::CallShowPingResult() Shows the ping result on request

	 */

	public static function Enable() {



		//Register the sitemap creator to wordpress...

		add_action('admin_menu', array(__CLASS__, 'RegisterAdminPage'));



		// Add a widget to the dashboard.

		add_action( 'wp_dashboard_setup', array(__CLASS__, 'WpDashboardSetup'));



		//Nice icon for Admin Menu (requires Ozh Admin Drop Down Plugin)

		add_filter('ozh_adminmenu_icon', array(__CLASS__, 'RegisterAdminIcon'));



		//Additional links on the plugin page

		add_filter('plugin_row_meta', array(__CLASS__, 'RegisterPluginLinks'), 10, 2);



		//Listen to ping request

		add_action('sm_ping', array(__CLASS__, 'CallSendPing'), 10, 1);



		//Listen to daily ping

		add_action('sm_ping_daily', array(__CLASS__, 'CallSendPingDaily'), 10, 1);



		//Post is somehow changed (also publish to publish (=edit) is fired)

		add_action('transition_post_status', array(__CLASS__, 'SchedulePingOnStatusChange'), 9999, 3);



		//Robots.txt request

		add_action('do_robots', array(__CLASS__, 'CallDoRobots'), 100, 0);



		//Help topics for context sensitive help

		//add_filter('contextual_help_list', array(__CLASS__, 'CallHtmlShowHelpList'), 9999, 2);



		//Check if the result of a ping request should be shown

		if(!empty($_GET["sm_ping_service"])) {

			self::CallShowPingResult();

		}



		//Fix rewrite rules if not already done on activation hook. This happens on network activation for example.

		if (get_option("sm_rewrite_done", null) != self::$svnVersion) {

			add_action('wp_loaded', array(__CLASS__, 'ActivateRewrite'), 9999, 1);

		}



		//Schedule daily ping

		if (!wp_get_schedule('sm_ping_daily')) {

			wp_schedule_event(time() + (60 * 60), 'daily', 'sm_ping_daily');

		}

	}



	/**

	 * Sets up the query vars and template redirect hooks

	 * @uses GoogleSitemapGeneratorLoader::RegisterQueryVars

	 * @uses GoogleSitemapGeneratorLoader::DoTemplateRedirect

	 * @since 4.0

	 */

	public static function SetupQueryVars() {



		add_filter('query_vars', array(__CLASS__, 'RegisterQueryVars'), 1, 1);



		add_filter('template_redirect', array(__CLASS__, 'DoTemplateRedirect'), 1, 0);



	}



	/**

	 * Register the plugin specific "xml_sitemap" query var

	 *

	 * @since 4.0

	 * @param $vars Array Array of existing query_vars

	 * @return Array An aarray containing the new query vars

	 */

	public static function RegisterQueryVars($vars) {

		array_push($vars, 'xml_sitemap');

		return $vars;

	}



	/**

	 * Registers the plugin specific rewrite rules

	 *

	 * Combined: sitemap(-+([a-zA-Z0-9_-]+))?\.(xml|html)(.gz)?$

	 *

	 * @since 4.0

	 * @param $wpRules Array of existing rewrite rules

	 * @return Array An array containing the new rewrite rules

	 */

	public static function AddRewriteRules($wpRules) {

		$smRules = array(

			'sitemap(-+([a-zA-Z0-9_-]+))?\.xml$' => 'index.php?xml_sitemap=params=$matches[2]',

			'sitemap(-+([a-zA-Z0-9_-]+))?\.xml\.gz$' => 'index.php?xml_sitemap=params=$matches[2];zip=true',

			'sitemap(-+([a-zA-Z0-9_-]+))?\.html$' => 'index.php?xml_sitemap=params=$matches[2];html=true',

			'sitemap(-+([a-zA-Z0-9_-]+))?\.html.gz$' => 'index.php?xml_sitemap=params=$matches[2];html=true;zip=true'

		);

		return array_merge($smRules,$wpRules);

	}



	/**

	 * Returns the rules required for Nginx permalinks

	 *

	 * @return string[]

	 */

	public static function GetNginXRules() {

		return array(

			'rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml$ "/index.php?xml_sitemap=params=$2" last;',

			'rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml\.gz$ "/index.php?xml_sitemap=params=$2;zip=true" last;',

			'rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html$ "/index.php?xml_sitemap=params=$2;html=true" last;',

			'rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html.gz$ "/index.php?xml_sitemap=params=$2;html=true;zip=true" last;'

		);



	}



	/**

	 * Adds the filters for wp rewrite rule adding

	 *

	 * @since 4.0

	 * @uses add_filter()

	 */

	public static function SetupRewriteHooks() {

		add_filter('rewrite_rules_array', array(__CLASS__, 'AddRewriteRules'), 1, 1);

	}



	/**

	 * Flushes the rewrite rules

	 *

	 * @since 4.0

	 * @global $wp_rewrite WP_Rewrite

	 * @uses WP_Rewrite::flush_rules()

	 */

	public static function ActivateRewrite() {

		/** @var $wp_rewrite WP_Rewrite */

		global $wp_rewrite;

		$wp_rewrite->flush_rules(false);

		update_option("sm_rewrite_done", self::$svnVersion);

	}



	/**

	 * Handled the plugin activation on installation

	 *

	 * @uses GoogleSitemapGeneratorLoader::ActivateRewrite

	 * @since 4.0

	 */

	public static function ActivatePlugin() {

		self::SetupRewriteHooks();

		self::ActivateRewrite();



		if(self::LoadPlugin()) {

			$gsg = GoogleSitemapGenerator::GetInstance();

			if($gsg->OldFileExists()) {

				$gsg->DeleteOldFiles();

			}

		}



	}



	/**

	 * Handled the plugin deactivation

	 *

	 * @uses GoogleSitemapGeneratorLoader::ActivateRewrite

	 * @since 4.0

	 */

	public static function DeactivatePlugin() {

		delete_option("sm_rewrite_done");

		wp_clear_scheduled_hook('sm_ping_daily');

	}





	/**

	 * Handles the plugin output on template redirection if the xml_sitemap query var is present.

	 *

	 * @since 4.0

	 */

	public static function DoTemplateRedirect() {

		/** @var $wp_query WP_Query */

		global $wp_query;

		if(!empty($wp_query->query_vars["xml_sitemap"])) {

			$wp_query->is_404 = false;

			$wp_query->is_feed = true;

			self::CallShowSitemap($wp_query->query_vars["xml_sitemap"]);

		}

	}



	/**

	 * Registers the plugin in the admin menu system

	 *

	 * @uses add_options_page()

	 */

	public static function RegisterAdminPage() {

		add_options_page(__('XML-Sitemap Generator', 'sitemap'), __('XML-Sitemap', 'sitemap'), 'administrator', self::GetBaseName(), array(__CLASS__, 'CallHtmlShowOptionsPage'));

	}



	/**

	 * Add a widget to the dashboard.

	 */

	public static function WpDashboardSetup($a) {

		self::LoadPlugin();

		$sg = GoogleSitemapGenerator::GetInstance();



		if ($sg->ShowSurvey()) {

			add_action( 'admin_notices', array(__CLASS__, 'WpDashboardAdminNotices' ) );

		}

	}



	public static function WpDashboardAdminNotices() {

		$sg = GoogleSitemapGenerator::GetInstance();

		$sg->HtmlSurvey();

	}



	/**

	 * Returns a nice icon for the Ozh Admin Menu if the {@param $hook} equals to the sitemap plugin

	 *

	 * @param string $hook The hook to compare

	 * @return string The path to the icon

	 */

	public static function RegisterAdminIcon($hook) {

		if($hook == self::GetBaseName() && function_exists('plugins_url')) {

			return plugins_url('img/icon-arne.gif', self::GetBaseName());

		}

		return $hook;

	}



	/**

	 * Registers additional links for the sitemap plugin on the WP plugin configuration page

	 *

	 * Registers the links if the $file param equals to the sitemap plugin

	 * @param $links Array An array with the existing links

	 * @param $file string The file to compare to

	 * @return string[]

	 */

	public static function RegisterPluginLinks($links, $file) {

		$base = self::GetBaseName();

		if($file == $base) {

			$links[] = '<a href="options-general.php?page=' . self::GetBaseName() . '">' . __('Settings', 'sitemap') . '</a>';

			$links[] = '<a href="http://www.arnebrachhold.de/redir/sitemap-plist-faq/">' . __('FAQ', 'sitemap') . '</a>';

			$links[] = '<a href="http://www.arnebrachhold.de/redir/sitemap-plist-support/">' . __('Support', 'sitemap') . '</a>';

		}

		return $links;

	}



	/**

	 * @param $new_status string The new post status

	 * @param $old_status string The old post status

	 * @param $post WP_Post The post object

	 */

	public static function SchedulePingOnStatusChange($new_status, $old_status, $post ) {

		if($new_status == 'publish') {

			set_transient('sm_ping_post_id', $post->ID, 120);

			wp_schedule_single_event(time() + 5, 'sm_ping');

		}

	}



	/**

	 * Invokes the HtmlShowOptionsPage method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::HtmlShowOptionsPage()

	 */

	public static function CallHtmlShowOptionsPage() {

		if(self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->HtmlShowOptionsPage();

		}

	}



	/**

	 * Invokes the ShowPingResult method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::ShowPingResult()

	 */

	public static function CallShowPingResult() {

		if(self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->ShowPingResult();

		}

	}



	/**

	 * Invokes the SendPing method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::SendPing()

	 */

	public static function CallSendPing() {

		if(self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->SendPing();

		}

	}



	/**

	 * Invokes the SendPingDaily method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::SendPingDaily()

	 */

	public static function CallSendPingDaily()

	{

		if (self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->SendPingDaily();

		}

	}



	/**

	 * Invokes the ShowSitemap method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::ShowSitemap()

	 */

	public static function CallShowSitemap($options) {

		if(self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->ShowSitemap($options);

		}

	}



	/**

	 * Invokes the DoRobots method of the generator

	 * @uses GoogleSitemapGeneratorLoader::LoadPlugin()

	 * @uses GoogleSitemapGenerator::DoRobots()

	 */

	public static function CallDoRobots() {

		if(self::LoadPlugin()) {

			GoogleSitemapGenerator::GetInstance()->DoRobots();

		}

	}



	/**

	 * Displays the help links in the upper Help Section of WordPress

	 *

	 * @return Array The new links

	 */

	public static function CallHtmlShowHelpList() {



		$screen = get_current_screen();

		$id = get_plugin_page_hookname(self::GetBaseName(), 'options-general.php');



		if(is_object($screen) &&  $screen->id == $id) {



			/*

			load_plugin_textdomain('sitemap',false,dirname( plugin_basename( __FILE__ ) ) .  '/lang');



			$links = array(

				__('Plugin Homepage', 'sitemap') => 'http://www.arnebrachhold.de/redir/sitemap-help-home/',

				__('My Sitemaps FAQ', 'sitemap') => 'http://www.arnebrachhold.de/redir/sitemap-help-faq/'

			);



			$filterVal[$id] = '';



			$i = 0;

			foreach($links AS $text => $url) {

				$filterVal[$id] .= '<a href="' . $url . '">' . $text . '</a>' . ($i < (count($links) - 1) ? ' | ' : '');

				$i++;

			}



			$screen->add_help_tab( array(

			    'id'      => 'sitemap-links',

			    'title'   => __('My Sitemaps FAQ', 'sitemap'),

			    'content' => '<p>' . __('dsf dsf sd f', 'sitemap') . '</p>',



			));

			*/



		}

		//return $filterVal;

	}





	/**

	 * Loads the actual generator class and tries to raise the memory and time limits if not already done by WP

	 *

	 * @uses GoogleSitemapGenerator::Enable()

	 * @return boolean true if run successfully

	 */

	public static function LoadPlugin() {



		if(!class_exists("GoogleSitemapGenerator")) {



			$mem = abs(intval(@ini_get('memory_limit')));

			if($mem && $mem < 128) {

				@ini_set('memory_limit', '128M');

			}



			$time = abs(intval(@ini_get("max_execution_time")));

			if($time != 0 && $time < 120) {

				@set_time_limit(120);

			}



			$path = trailingslashit(dirname(__FILE__));



			if(!file_exists($path . 'sitemap-core.php')) return false;

			require_once($path . 'sitemap-core.php');

		}



		GoogleSitemapGenerator::Enable();

		return true;

	}



	/**

	 * Returns the plugin basename of the plugin (using __FILE__)

	 *

	 * @return string The plugin basename, "sitemap" for example

	 */

	public static function GetBaseName() {

		return plugin_basename(sm_GetInitFile());

	}



	/**

	 * Returns the name of this loader script, using sm_GetInitFile

	 *

	 * @return string The sm_GetInitFile value

	 */

	public static function GetPluginFile() {

		return sm_GetInitFile();

	}



	/**

	 * Returns the plugin version

	 *

	 * Uses the WP API to get the meta data from the top of this file (comment)

	 *

	 * @return string The version like 3.1.1

	 */

	public static function GetVersion() {

		if(!isset($GLOBALS["sm_version"])) {

			if(!function_exists('get_plugin_data')) {

				if(file_exists(ABSPATH . 'wp-admin/includes/plugin.php')) {

					require_once(ABSPATH . 'wp-admin/includes/plugin.php');

				}

				else return "0.ERROR";

			}

			$data = get_plugin_data(self::GetPluginFile(), false, false);

			$GLOBALS["sm_version"] = $data['Version'];

		}

		return $GLOBALS["sm_version"];

	}



	public static function GetSvnVersion() {

		return self::$svnVersion;

	}

}



//Enable the plugin for the init hook, but only if WP is loaded. Calling this php file directly will do nothing.

if(defined('ABSPATH') && defined('WPINC')) {

	add_action("init", array("GoogleSitemapGeneratorLoader", "Enable"), 15, 0);

	register_activation_hook(sm_GetInitFile(), array('GoogleSitemapGeneratorLoader', 'ActivatePlugin'));

	register_deactivation_hook(sm_GetInitFile(), array('GoogleSitemapGeneratorLoader', 'DeactivatePlugin'));



	//Set up hooks for adding permalinks, query vars.

	//Don't wait until init with this, since other plugins might flush the rewrite rules in init already...

	GoogleSitemapGeneratorLoader::SetupQueryVars();

	GoogleSitemapGeneratorLoader::SetupRewriteHooks();

}