<?php
/**
 * Loopback fetcher.
 *
 * @package A11yMate
 */

namespace A11yMate\Scanner;

defined( 'ABSPATH' ) || exit;

/**
 * Fetches pages as an anonymous visitor.
 */
class Fetcher {

	/**
	 * Fetch a URL.
	 *
	 * @param string $url URL.
	 * @return array{code:int,html:string,error:string}
	 */
	public static function fetch( $url ) {
		$args = array(
			'timeout'             => 25,
			'redirection'         => 4,
			'sslverify'           => (bool) apply_filters( 'https_local_ssl_verify', false ), // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- core filter.
			'user-agent'          => 'A11yMate/' . A11YMATE_VERSION . ' (+loopback scan; ' . home_url() . ')',
			'cookies'             => array(),
			'reject_unsafe_urls'  => false,
			'limit_response_size' => 4 * MB_IN_BYTES,
			'headers'             => array( 'Accept' => 'text/html,application/xhtml+xml' ),
		);
		/**
		 * Filter the loopback request arguments (for example to add basic-auth credentials on a staging site).
		 *
		 * @param array  $args Arguments for wp_remote_get().
		 * @param string $url  URL being fetched.
		 */
		$args = apply_filters( 'a11ymate_fetch_args', $args, $url );
		$res  = wp_remote_get( $url, $args );
		if ( is_wp_error( $res ) ) {
			return array(
				'code'  => 0,
				'html'  => '',
				'error' => $res->get_error_message(),
			);
		}
		$code = (int) wp_remote_retrieve_response_code( $res );
		$ct   = (string) wp_remote_retrieve_header( $res, 'content-type' );
		if ( '' !== $ct && false === stripos( $ct, 'html' ) ) {
			return array(
				'code'  => $code,
				'html'  => '',
				'error' => sprintf(
					/* translators: %s: content type */
					__( 'Not an HTML page (%s).', 'a11ymate' ),
					$ct
				),
			);
		}
		return array(
			'code'  => $code,
			'html'  => (string) wp_remote_retrieve_body( $res ),
			'error' => '',
		);
	}
}