From 7d357079302207d8828ad31358508bb46ea4bc36 Mon Sep 17 00:00:00 2001
From: Kyle Hornberg <kyle.hornberg@gmail.com>
Date: Fri, 22 Nov 2013 13:17:39 -0600
Subject: [PATCH] Refactor into object. Add multiple events to calendar. Detect
 OS for line endings.

---
 ics.js | 140 ++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 95 insertions(+), 45 deletions(-)

diff --git a/ics.js b/ics.js
index 3ecfcfe..eba60f8 100644
--- a/ics.js
+++ b/ics.js
@@ -1,50 +1,100 @@
-/*  VCS-Maker.js  */
-download_ics = function(filename, subject, description, location, begin, end, ext) {
-	var ext = typeof ext !== 'undefined' ? ext : '.ics';
+/* global saveAs */
+/* global Blob */
+/* global BlobBuilder */
+/* global console */
+/* exported ics */
+
+var ics = function() {
+	'use strict';
 
 	if (navigator.userAgent.indexOf('MSIE') > -1 && navigator.userAgent.indexOf('MSIE 10') == -1) {
 		console.log('Unsupported Browser');
 		return;
+	}
+
+	var SEPARATOR = (navigator.appVersion.indexOf('Win') !== -1) ? '\r\n' : '\n';
+	var calendarEvents = [];
+	var calendarStart = [
+		'BEGIN:VCALENDAR',
+		'VERSION:2.0'
+	].join(SEPARATOR);
+	var calendarEnd = SEPARATOR + 'END:VCALENDAR';
+
+	return {
+		/**
+		 * Returns events array
+		 * @return {array} Events
+		 */
+		'events' : function () {
+			return calendarEvents;
+		},
+
+		/**
+		 * Returns calendar
+		 * @return {string} Calendar in iCalendar format
+		 */
+		'calendar' : function () {
+			return calendarStart + calendarEvents.join(SEPARATOR) + calendarEnd;
+		},
+
+		/**
+		 * Add event to the calendar
+		 * @param  {string} subject     Subject/Title of event
+		 * @param  {string} description Description of event
+		 * @param  {string} location    Location of event
+		 * @param  {string} begin       Beginning date of event
+		 * @param  {string} stop        Ending date of event
+		 */
+		'addEvent' : function (subject, description, location, begin, stop) {
+			//TODO add time and time zone? use moment to format?
+			var start_date = new Date(begin);
+			var end_date = new Date(stop);
+
+			var start_year = ('0000' + (start_date.getFullYear().toString())).slice(-4);
+			var start_month = ('00' + (start_date.getMonth().toString())).slice(-2) + 1;
+			var start_day = ('00' + (start_date.getDate().toString())).slice(-2);
+			var start = start_year + (Number(start_month)+1) + start_day;
+
+			var end_year = ('0000' + (end_date.getFullYear().toString())).slice(-4);
+			var end_month = ('00' + (end_date.getMonth().toString())).slice(-2);
+			var end_day = ('00' + ((end_date.getDate()+1).toString())).slice(-2);
+			var end = end_year + (Number(end_month)+1) + end_day;
+
+			var calendarEvent = [
+				'BEGIN:VEVENT',
+				'CLASS:PUBLIC',
+				'DESCRIPTION:'+description,
+				'DTSTART;VALUE=DATE:'+start,
+				'DTEND;VALUE=DATE:'+end,
+				'LOCATION:'+location,
+				'SUMMARY;LANGUAGE=en-us:'+subject,
+				'TRANSP:TRANSPARENT',
+				'END:VEVENT'
+			].join(SEPARATOR);
+
+			calendarEvents.push(calendarEvent);
+		},
+
+		/**
+		 * Download calendar using the saveAs function from filesave.js
+		 * @param  {string} filename Filename
+		 * @param  {string} ext      Extention
+		 */
+		'download' : function (filename, ext) {
+			ext = (typeof ext !== 'undefined') ? ext : '.ics';
+			filename = (typeof filename !== 'undefined') ? filename : 'calendar';
+			var calendar = calendarStart + calendarEvents.join(SEPARATOR) + calendarEnd;
+
+			var blob;
+			if (navigator.userAgent.indexOf('MSIE 10') > -1) { // chrome or firefox
+				blob = new Blob([calendar]);
+			}
+			else  { // ie
+				var bb = new BlobBuilder();
+				bb.append(calendar);
+				blob = bb.getBlob('text/x-vCalendar;charset=' + document.characterSet);
+			}
+			saveAs(blob, filename+ext);
+		}
 	};
-
-	var subject = subject;
-	var description = description;
-	var address = location;
-	var start_date = new Date(begin);
-	var end_date = new Date(end);
-
-	var start_year = ("0000" + (start_date.getFullYear().toString())).slice(-4);
-	var start_month = ("00" + (start_date.getMonth().toString())).slice(-2);
-	var start_day = ("00" + (start_date.getDate().toString())).slice(-2);
-	var start = start_year + start_month + start_day;
-
-	var end_year = ("0000" + (end_date.getFullYear().toString())).slice(-4);
-	var end_month = ("00" + (end_date.getMonth().toString())).slice(-2);
-	var end_day = ("00" + ((end_date.getDate()+1).toString())).slice(-2);
-	var end = end_year + end_month + end_day;
-
-	var calendar = [
-		"BEGIN:VCALENDAR",
-		"VERSION:2.0",
-		"BEGIN:VEVENT",
-		"CLASS:PUBLIC",
-		"DESCRIPTION:"+description,
-		"DTSTART;VALUE=DATE:"+start,
-		"DTEND;VALUE=DATE:"+end,
-		"LOCATION:"+address,
-		"SUMMARY;LANGUAGE=en-us:"+subject,
-		"TRANSP:TRANSPARENT",
-		"END:VEVENT",
-		"END:VCALENDAR"
-	].join('\n');
-
-	if (navigator.userAgent.indexOf('MSIE 10') > -1) { // chrome or firefox
-		var blob = new Blob([calendar]);
-	}
-	else  { // ie
-		var bb = new BlobBuilder();
-		bb.append(calendar);
-		var blob = bb.getBlob("text/x-vCalendar;charset=" + document.characterSet);
-	}
-	saveAs(blob, filename+ext);
-}
+};