/**
 * Admin UI behavior for Robotstxt SMTP settings.
 *
 * @package RobotstxtSMTP
 */

(function () {
		'use strict';

		var initializeAdmin = function () {
				var security = document.getElementById( 'robotstxt_smtp_security' );
				var port     = document.getElementById( 'robotstxt_smtp_port' );

			if ( ! security || ! port) {
					return;
			}

				var defaultPorts = {
					none: 25,
					ssl: 465,
					tls: 587
			};

				var previousValue = security.value || 'none';

				security.addEventListener(
					'change',
					function () {
						var newValue        = security.value || 'none';
						var previousDefault = Object.prototype.hasOwnProperty.call( defaultPorts, previousValue )
								? defaultPorts[previousValue]
								: null;
						var newDefault      = Object.prototype.hasOwnProperty.call( defaultPorts, newValue )
								? defaultPorts[newValue]
								: null;
						var currentPort     = parseInt( port.value, 10 );

						if ( ! Number.isNaN( currentPort ) && null !== previousDefault && currentPort === previousDefault && null !== newDefault) {
							port.value = newDefault;
						}

						previousValue = newValue;
					}
				);
		};

	if ('loading' !== document.readyState) {
			initializeAdmin();
	} else {
			document.addEventListener( 'DOMContentLoaded', initializeAdmin );
	}
})();