<?php

class WPML_URL_HTTP_Referer {

	private $rest;

	public function __construct( WPML_Rest $rest ) {
		$this->rest = $rest;
	}

	/**
	 * @param string $backup_url
	 *
	 * @return string
	 */
	public function get_url( $backup_url ) {
		if ( ! isset( $_SERVER['HTTP_REFERER'] ) ) {
			return $backup_url;
		}

		if ( WPML_Ajax::is_admin_ajax_request_called_from_frontend( $backup_url )
			 || $this->is_rest_request_called_from_post_edit_page()
		) {
			return $_SERVER['HTTP_REFERER'];
		}

		return $backup_url;
	}

	/**
	 * @return bool|int
	 */
	public function get_trid() {
		$referer_data = $request_uri_data = array();

		if ( array_key_exists( 'HTTP_REFERER', $_SERVER ) ) {
			$query = wpml_parse_url( $_SERVER['HTTP_REFERER'], PHP_URL_QUERY );
			parse_str( $query, $referer_data );
		}

		if ( array_key_exists( 'REQUEST_URI', $_SERVER ) ) {
			$request_uri = wpml_parse_url( $_SERVER['REQUEST_URI'], PHP_URL_QUERY );
			parse_str( $request_uri, $request_uri_data );
		}

		/**
		 * trid from `HTTP_REFERER` should be return only if `REQUEST_URI` also has trid set.
		 *
		 * @link https://onthegosystems.myjetbrains.com/youtrack/issue/wpmltm-1351
		 *
		 * Or when it is a rest request called in the post edit page (Gutenberg)
		 * @link https://onthegosystems.myjetbrains.com/youtrack/issue/wpmlcore-5265
		 */
		return array_key_exists( 'trid', $referer_data ) && array_key_exists( 'trid', $request_uri_data )
			   || ( array_key_exists( 'trid', $referer_data ) && $this->is_rest_request_called_from_post_edit_page() )
			? (int) $referer_data['trid']
			: false;
	}

	/**
	 * We need this in order to detect the language when adding
	 * translation from inside of a Gutenberg page while
	 * they don't provide a JS API which allows us to do it
	 *
	 * @link https://github.com/WordPress/gutenberg/issues/5958
	 * @link https://onthegosystems.myjetbrains.com/youtrack/issue/wpmlcore-5265
	 *
	 * @return bool
	 */
	public function is_rest_request_called_from_post_edit_page() {
		return $this->rest->is_rest_request() && self::is_post_edit_page();
	}

	public static function is_post_edit_page() {
		return isset( $_SERVER['HTTP_REFERER'] )
			   && ( strpos( $_SERVER['HTTP_REFERER'], 'wp-admin/post.php' )
					|| strpos( $_SERVER['HTTP_REFERER'], 'wp-admin/post-new.php' )
					|| strpos( $_SERVER['HTTP_REFERER'], 'wp-admin/edit.php' ) );
	}
}
