<?php

/**
 * Class WPML_Request
 *
 * @package    wpml-core
 * @subpackage wpml-requests
 *
 * @abstract
 */

abstract class WPML_Request {

	/** @var  WPML_URL_Converter */
	protected $url_converter;
	protected $active_languages;
	protected $default_language;
	protected $qs_lang_cache;
	private   $cookie;
	protected $wp_api;

	/**
	 * @param WPML_URL_Converter $url_converter
	 * @param array              $active_languages
	 * @param string             $default_language
	 * @param WPML_Cookie        $cookie
	 * @param WPML_WP_API        $wp_api
	 */
	public function __construct( $url_converter, $active_languages, $default_language, $cookie, $wp_api ) {
		$this->url_converter    = $url_converter;
		$this->active_languages = $active_languages;
		$this->default_language = $default_language;
		$this->cookie           = $cookie;
		$this->wp_api           = $wp_api;
	}

	protected abstract function get_cookie_name();

	/**
	 * Determines the language of the current request.
	 *
	 * @return string|false language code of the current request, determined from the requested url and the user's
	 *                      cookie.
	 */
	public abstract function get_requested_lang();

	/**
	 * Returns the current REQUEST_URI optionally filtered
	 *
	 * @param null|int $filter filter to apply to the REQUEST_URI, takes the same arguments
	 *                         as filter_var for the filter type.
	 *
	 * @return string
	 */
	public function get_request_uri( $filter = null ) {
		$request_uri = isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '/';
		if ( $filter !== null ) {
			$request_uri = filter_var( $request_uri, $filter );
		}

		return $request_uri;
	}

	/**
	 * @global $wpml_url_converter
	 *
	 * @return string|false language code that can be determined from the currently requested URI.
	 */
	public function get_request_uri_lang() {
		$req_url = isset($_SERVER[ 'HTTP_HOST' ])
			? untrailingslashit($_SERVER[ 'HTTP_HOST' ] . $_SERVER[ 'REQUEST_URI' ] ) : "";

		return $this->url_converter->get_language_from_url ( $req_url );
	}

	/**
	 * @return string language code stored in the user's wp_wpml_current_language cookie
	 */
	public function get_cookie_lang() {
		global $wpml_language_resolution;
		$cookie_name  = $this->get_cookie_name();
		$cookie_value = $this->cookie->get_cookie( $cookie_name );
		$lang         = $cookie_value ? substr( $cookie_value, 0, 10 ) : null;
		$lang         = $wpml_language_resolution->is_language_active( $lang ) ? $lang : $this->default_language;

		return $lang;
	}

	/**
	 * Checks whether hidden languages are to be displayed at the moment.
	 * They are displayed in the frontend if the users has the respective option icl_show_hidden_languages set in his
	 * user_meta. The are displayed in the backend for all admins with manage_option capabilities.
	 *
	 * @return bool true if hidden languages are to be shown
	 */
	public function show_hidden() {

		return !did_action( 'init' )
		       || ( get_user_meta( get_current_user_id(), 'icl_show_hidden_languages', true )
		            || ( is_admin() && current_user_can( 'manage_options' ) ) );
	}

	/**
	 * Sets the language code of the current screen in the User's wp_wpml_current_language cookie
	 *
	 * When user is not logged we must set cookie with JS to avoid issues with cached pages
	 *
	 * @param string $lang_code
	 */
	public function set_language_cookie( $lang_code ) {
		global $sitepress;

		$cookie_name = $this->get_cookie_name();

		if ( is_user_logged_in() ) {
			if ( ! $this->cookie->headers_sent() ) {
				if ( preg_match( '@\.(css|js|png|jpg|gif|jpeg|bmp)@i',
						basename( preg_replace( '@\?.*$@', '', $_SERVER['REQUEST_URI'] ) ) )
				     || isset( $_POST['icl_ajx_action'] ) || isset( $_POST['_ajax_nonce'] ) || defined( 'DOING_AJAX' )
				) {
					return;
				}

				$current_cookie_value = $this->cookie->get_cookie( $cookie_name );
				if ( ! $current_cookie_value || $current_cookie_value !== $lang_code) {
					$cookie_domain = $this->get_cookie_domain();
					$cookie_path   = defined( 'COOKIEPATH' ) ? COOKIEPATH : '/';
					$this->cookie->set_cookie( $cookie_name, $lang_code, time() + DAY_IN_SECONDS, $cookie_path, $cookie_domain );
				}
			}
		} else if ( $sitepress->get_setting( WPML_Cookie_Setting::COOKIE_SETTING_FIELD ) ) {
			$wpml_cookie_scripts = new WPML_Cookie_Scripts( $cookie_name, $sitepress->get_current_language() );
			$wpml_cookie_scripts->add_hooks();
		}

		$_COOKIE[ $cookie_name ] = $lang_code;

		do_action( 'wpml_language_cookie_added', $lang_code );
	}

	/**
	 * @return bool|string
	 */
	public function get_cookie_domain() {

		return defined( 'COOKIE_DOMAIN' ) ? COOKIE_DOMAIN : $this->get_server_host_name();
	}

	/**
	 * Returns SERVER_NAME, or HTTP_HOST if the first is not available
	 *
	 * @return string
	 */
	public function get_server_host_name() {
		$host = isset( $_SERVER[ 'HTTP_HOST' ] ) ? $_SERVER[ 'HTTP_HOST' ] : null;
		$host = $host !== null
			? $host
			: ( isset( $_SERVER[ 'SERVER_NAME' ] )
				? $_SERVER[ 'SERVER_NAME' ]
				  . ( isset( $_SERVER[ 'SERVER_PORT' ] ) && ! in_array( $_SERVER[ 'SERVER_PORT' ], array( 80, 443 ) )
					? ':' . $_SERVER[ 'SERVER_PORT' ] : '' )
				: '' );

		//Removes standard ports 443 (80 should be already omitted in all cases)
		$result = preg_replace( "@:[443]+([/]?)@", '$1', $host );

		return $result;
	}

	/**
	 * Gets the source_language $_GET parameter from the HTTP_REFERER
	 * @return string|bool
	 */
	public function get_source_language_from_referer() {
		$referer = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : '';
		$query   = wpml_parse_url( $referer, PHP_URL_QUERY );
		parse_str( $query, $query_parts );
		$source_lang = isset( $query_parts['source_lang'] ) ? $query_parts['source_lang'] : false;

		return $source_lang;
	}

	/**
	 * @return mixed
	 */
	public function get_comment_language() {
		$comment_language = $this->default_language;

		if ( array_key_exists( WPML_WP_Comments::LANG_CODE_FIELD, $_POST ) ) {
			$comment_language = filter_var( $_POST[WPML_WP_Comments::LANG_CODE_FIELD], FILTER_SANITIZE_SPECIAL_CHARS );
		}
		return $comment_language;
	}
}
