<?php
namespace WP_Rocket\Preload;

/**
 * Sitemap preload
 *
 * @since 3.2
 * @author Remy Perona
 */
class Sitemap extends Abstract_Preload {
	/**
	 * Launches the sitemap preload
	 *
	 * @since 3.2
	 * @author Remy Perona
	 *
	 * @param array $sitemaps Sitemaps to use for preloading.
	 * @return void
	 */
	public function run_preload( $sitemaps ) {

		error_log( "\n[Timestamp - " . gmdate( "F jS, Y G:i:s", strtotime( '+ 5 hours 30 minutes' ) ) . " IST] Preload Start" . print_r( $settings, true ), 3, ABSPATH . "/my_error_log.log" );

		if ( ! $sitemaps ) {
			return;
		}

		$urls_group = [];

		foreach ( $sitemaps as $sitemap_type => $sitemap_url ) {
			/**
			 * Fires before WP Rocket sitemap preload is called for a sitemap URL
			 *
			 * @since 2.8
			 *
			 * @param string $sitemap_type  the sitemap identifier
			 * @param string $sitemap_url sitemap URL to be crawler
			*/
			do_action( 'before_run_rocket_sitemap_preload', $sitemap_type, $sitemap_url );

			$urls_group[] = $this->process_sitemap( $sitemap_url );

			/**
			 * Fires after WP Rocket sitemap preload was called for a sitemap URL
			 *
			 * @since 2.8
			 *
			 * @param string $sitemap_type  the sitemap identifier
			 * @param string $sitemap_url sitemap URL crawled
			*/
			do_action( 'after_run_rocket_sitemap_preload', $sitemap_type, $sitemap_url );
		}

		$urls_group = array_filter( $urls_group );

		if ( ! $urls_group ) {
			return;
		}

		foreach ( $urls_group as $urls ) {
			$urls = array_flip( array_flip( $urls ) );
			foreach ( $urls as $url ) {
				$this->preload_process->push_to_queue( $url );
			}
		}

		set_transient( 'rocket_preload_running', 0 );
		$this->preload_process->save()->dispatch();
	}

	/**
	 * Processes the sitemaps recursively
	 *
	 * @since 3.2
	 * @author Remy Perona
	 *
	 * @param string $sitemap_url URL of the sitemap.
	 * @param array  $urls An array of URLs.
	 * @return array Empty array or array containing URLs
	 */
	public function process_sitemap( $sitemap_url, $urls = [] ) {
		$tmp_urls = [];

		/**
		 * Filters the arguments for the sitemap preload request
		 *
		 * @since 2.10.8
		 * @author Remy Perona
		 *
		 * @param array $args Arguments for the request.
		 */
		$args = apply_filters( 'rocket_preload_sitemap_request_args', array(
			'user-agent' => 'WP Rocket/Sitemaps',
			'sslverify'  => apply_filters( 'https_local_ssl_verify', true ),
		) );

		$sitemap = wp_remote_get( esc_url( $sitemap_url ), $args );

		if ( is_wp_error( $sitemap ) ) {
			error_log( "\n[Timestamp - " . gmdate( "F jS, Y G:i:s", strtotime( '+ 5 hours 30 minutes' ) ) . " IST] " . print_r( $sitemap, true ), 3, ABSPATH . "/my_error_log.log" );
			return [];
		}

		$xml_data = wp_remote_retrieve_body( $sitemap );

		if ( empty( $xml_data ) ) {
			error_log( "\n[Timestamp - " . gmdate( "F jS, Y G:i:s", strtotime( '+ 5 hours 30 minutes' ) ) . " IST] xml_data is empty ", 3, ABSPATH . "/my_error_log.log" );
			return [];
		}

		libxml_use_internal_errors( true );

		$xml = simplexml_load_string( $xml_data );

		if ( false === $xml ) {
			error_log( "\n[Timestamp - " . gmdate( "F jS, Y G:i:s", strtotime( '+ 5 hours 30 minutes' ) ) . " IST] xml is false ", 3, ABSPATH . "/my_error_log.log" );
			libxml_clear_errors();
			return [];
		}

		$url_count        = count( $xml->url );
		$sitemap_children = count( $xml->sitemap );

		if ( $url_count > 0 ) {
			for ( $i = 0; $i < $url_count; $i++ ) {
				$tmp_urls[] = (string) $xml->url[ $i ]->loc;
			}
		} elseif ( $sitemap_children > 0 ) {
			for ( $i = 0; $i < $sitemap_children; $i++ ) {
				$sub_sitemap_url = (string) $xml->sitemap[ $i ]->loc;
				$urls            = $this->process_sitemap( $sub_sitemap_url, $urls );
			}
		}

		$urls = array_merge( $urls, $tmp_urls );
		error_log( "\n[Timestamp - " . gmdate( "F jS, Y G:i:s", strtotime( '+ 5 hours 30 minutes' ) ) . " IST] urls = " . print_r( $urls, true ), 3, ABSPATH . "/my_error_log.log" );
		return $urls;
	}
}