<?php
namespace QWSpeedCache\Cache;

defined( 'ABSPATH' ) || exit;

/**
 * Cache warmup prioritization (traffic-aware) and safety filters.
 */
class Warmup {

	/**
	 * @param string[] $urls URLs.
	 * @return string[]
	 */
	public static function filter_safe( array $urls ) {
		$out       = array();
		$site_host = strtolower( (string) wp_parse_url( home_url( '/' ), PHP_URL_HOST ) );
		$site_scheme = strtolower( (string) wp_parse_url( home_url( '/' ), PHP_URL_SCHEME ) );
		if ( '' === $site_host ) {
			return $out;
		}
		foreach ( $urls as $url ) {
			if ( ! is_string( $url ) || '' === $url || strlen( $url ) > 2048 ) {
				continue;
			}
			$url = esc_url_raw( $url, array( 'http', 'https' ) );
			if ( '' === $url ) {
				continue;
			}
			$parts = wp_parse_url( $url );
			if ( ! is_array( $parts ) || empty( $parts['host'] ) || empty( $parts['scheme'] ) ) {
				continue;
			}
			$scheme = strtolower( (string) $parts['scheme'] );
			if ( ! in_array( $scheme, array( 'http', 'https' ), true ) || strtolower( (string) $parts['host'] ) !== $site_host || ( $site_scheme && $scheme !== $site_scheme ) || isset( $parts['user'] ) || isset( $parts['pass'] ) ) {
				continue;
			}
			$path = isset( $parts['path'] ) ? (string) $parts['path'] : '/';
			if ( SafetyPolicy::uri_is_sensitive( $path ) ) {
				continue;
			}
			$out[] = $url;
		}
		return array_values( array_unique( $out ) );
	}}