<?php

namespace LiteSpeed\Lib;

/**
 * Update guest vary
 *
 * @since 4.1
 */
class Guest
{
	const CONF_FILE = '.litespeed_conf.dat';
	const HASH 					= 'hash'; // Not set-able
	const O_CACHE_LOGIN_COOKIE 	= 'cache-login_cookie';
	const O_DEBUG 				= 'debug';
	const O_DEBUG_IPS 			= 'debug-ips';
	const O_UTIL_NO_HTTPS_VARY 		= 'util-no_https_vary';
	const O_GUEST_UAS = 'guest_uas';
	const O_GUEST_IPS = 'guest_ips';

	private static $_ip;
	private static $_vary_name = '_lscache_vary'; // this default vary cookie is used for logged in status check
	private $_conf = false;

	/**
	 * Constructor
	 *
	 * @since 4.1
	 */
	public function __construct()
	{
		!defined('LSCWP_CONTENT_FOLDER') && define('LSCWP_CONTENT_FOLDER', dirname(dirname(dirname(__DIR__))));
		// Load config
		$this->_conf = file_get_contents(LSCWP_CONTENT_FOLDER . '/' . self::CONF_FILE);
		if ($this->_conf) {
			$this->_conf = json_decode($this->_conf, true);
		}

		if (!empty($this->_conf[self::O_CACHE_LOGIN_COOKIE])) {
			self::$_vary_name = $this->_conf[self::O_CACHE_LOGIN_COOKIE];
		}
	}

	/**
	 * Update Guest vary
	 *
	 * @since  4.0
	 */
	public function update_guest_vary()
	{
		// This process must not be cached
		/**
		 * @reference https://wordpress.org/support/topic/soft-404-from-google-search-on-litespeed-cache-guest-vary-php/#post-16838583
		 */
		header('X-Robots-Tag: noindex');
		header('X-LiteSpeed-Cache-Control: no-cache');

		if ($this->always_guest()) {
			echo '[]';
			exit;
		}

		// If contains vary already, don't reload to avoid infinite loop when parent page having browser cache
		if ($this->_conf && self::has_vary()) {
			echo '[]';
			exit;
		}

		// Send vary cookie
		$vary = 'guest_mode:1';
		if ($this->_conf && empty($this->_conf[self::O_DEBUG])) {
			$vary = md5($this->_conf[self::HASH] . $vary);
		}

		$expire = time() + 2 * 86400;
		$is_ssl = !empty($this->_conf[self::O_UTIL_NO_HTTPS_VARY]) ? false : $this->is_ssl();
		setcookie(self::$_vary_name, $vary, $expire, '/', false, $is_ssl, true);

		// return json
		echo json_encode(array('reload' => 'yes'));
		exit;
	}

	/**
	 * WP's is_ssl() func
	 *
	 * @since 4.1
	 */
	private function is_ssl()
	{
		if (isset($_SERVER['HTTPS'])) {
			if ('on' === strtolower($_SERVER['HTTPS'])) {
				return true;
			}

			if ('1' == $_SERVER['HTTPS']) {
				return true;
			}
		} elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
			return true;
		}
		return false;
	}

	/**
	 * Check if default vary has a value
	 *
	 * @since 1.1.3
	 * @access public
	 */
	public static function has_vary()
	{
		if (empty($_COOKIE[self::$_vary_name])) {
			return false;
		}
		return $_COOKIE[self::$_vary_name];
	}

	/**
	 * Detect if is a guest visitor or not
	 *
	 * @since  4.0
	 */
	public function always_guest()
	{
		if (empty($_SERVER['HTTP_USER_AGENT'])) {
			return false;
		}

		if ($this->_conf[self::O_GUEST_UAS]) {
			$quoted_uas = array();
			foreach ($this->_conf[self::O_GUEST_UAS] as $v) {
				$quoted_uas[] = preg_quote($v, '#');
			}
			$match = preg_match('#' . implode('|', $quoted_uas) . '#i', $_SERVER['HTTP_USER_AGENT']);
			if ($match) {
				return true;
			}
		}

		if ($this->ip_access($this->_conf[self::O_GUEST_IPS])) {
			return true;
		}

		return false;
	}

	/**
	 * Check if the ip is in the range
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public function ip_access($ip_list)
	{
		if (!$ip_list) {
			return false;
		}
		if (!isset(self::$_ip)) {
			self::$_ip = self::get_ip();
		}
		// $uip = explode('.', $_ip);
		// if(empty($uip) || count($uip) != 4) Return false;
		// foreach($ip_list as $key => $ip) $ip_list[$key] = explode('.', trim($ip));
		// foreach($ip_list as $key => $ip) {
		// 	if(count($ip) != 4) continue;
		// 	for($i = 0; $i <= 3; $i++) if($ip[$i] == '*') $ip_list[$key][$i] = $uip[$i];
		// }
		return in_array(self::$_ip, $ip_list);
	}

	/**
	 * Get client ip
	 *
	 * @since 1.1.0
	 * @since  1.6.5 changed to public
	 * @access public
	 * @return string
	 */
	public static function get_ip()
	{
		$_ip = '';
		if (function_exists('apache_request_headers')) {
			$apache_headers = apache_request_headers();
			$_ip = !empty($apache_headers['True-Client-IP']) ? $apache_headers['True-Client-IP'] : false;
			if (!$_ip) {
				$_ip = !empty($apache_headers['X-Forwarded-For']) ? $apache_headers['X-Forwarded-For'] : false;
				$_ip = explode(',', $_ip);
				$_ip = $_ip[0];
			}
		}

		if (!$_ip) {
			$_ip = !empty($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : false;
		}
		return $_ip;
	}
}