<?php
/* ------------------------------
 *      XMLSF Controller CLASS
 * ------------------------------ */

class XMLSF_Sitemap_News
{
	/**
	 * Sitemap index name
	 * @var string
	 */
	private $sitemap = 'sitemap-news.xml';

	/**
	 * Post types included in sitemap index
	 * @var array
	 */
	private $post_types;

	/**
	 * Rewrite rules
	 * @var array
	 */
	public $rewrite_rules = array(
		'regex' => 'sitemap-news\.xml(\.gz)?$',
		'query' => '?feed=sitemap-news$matches[1]'
	);

	/**
	 * CONSTRUCTOR
	 * Runs on init
	 */

	function __construct( $sitemap )
	{
		if ( $sitemap ) $this->sitemap = $sitemap;

		// Rewrite rules filter.
		add_filter( 'rewrite_rules_array', array( $this, 'rewrite_rules' ), 99, 1 );

		// PINGING
		add_action( 'transition_post_status', array( $this, 'do_ping' ), 999, 3 );
	}

	/**
	 * Add sitemap rewrite rules
	 * 
	 * Hooked into rewrite_rules_array filter
	 *
	 * @param array $rewrite_rules
	 * @return array $rewrite_rules
	 */
	public function rewrite_rules( $rewrite_rules ) {
		global $wp_rewrite;

		$rewrite_rules = array_merge( array( $this->rewrite_rules['regex'] => $wp_rewrite->index . $this->rewrite_rules['query'] ), $rewrite_rules );

		return $rewrite_rules;
	}
	
	/**
	 * Do pings, hooked to transition post status
	 *
	 * @param $new_status
	 * @param $old_status
	 * @param $post
	 */
	public function do_ping( $new_status, $old_status, $post )
	{
		// bail out when already published or not publishing
		if ( $old_status == 'publish' || $new_status != 'publish' ) return;

		// bail out when Google ping not checked
		if ( ! in_array( 'google', (array) get_option( 'xmlsf_ping' ) ) ) return;

		// we're saving from post edit screen
		if ( ! empty( $_POST ) && ! empty( $_POST['action'] ) && 'editpost' == $_POST['action'] ) {
			// bail out when exclude field is checked
			if ( ! empty( $_POST['_xmlsf_news_exclude'] ) ) return;
		} else {
			// fall back on exclude meta data from DB which may be outdated (see bug)
			if ( get_post_meta( $post->ID, '_xmlsf_news_exclude' ) ) return;
		}

		$news_tags = (array) get_option('xmlsf_news_tags');

		// is this an active post type?
		if ( empty( $news_tags['post_type'] ) || ! in_array( $post->post_type, (array) $news_tags['post_type'] ) ) return;

		// are categories limited and is not in correct category?
		if ( ! empty( $news_tags['categories'] ) ) {
			$cats = wp_get_post_categories( $post->ID, array( 'fields' => 'ids' ) );
			$intersect = array_intersect( (array) $cats, (array) $news_tags['categories'] );
			if ( empty( $intersect ) ) return;
		}

		// PING
		xmlsf_ping( 'google', $this->sitemap, 5 * MINUTE_IN_SECONDS );
	}

}