var ical = require('./ical')
  , request = require('request')
  , fs = require('fs')

exports.fromURL = function(url, opts, cb){
  if (!cb)
    return;
  request(url, opts, function(err, r, data){
  	if (err)
  	{
  	  return cb(err, null);
  	}
  	else if (r.statusCode != 200)
  	{
       return cb(r.statusCode + ": " + r.statusMessage, null);
  	}

  	cb(undefined, ical.parseICS(data));
  })
}

exports.parseFile = function(filename){
  return ical.parseICS(fs.readFileSync(filename, 'utf8'))
}


var rrule = require('rrule').RRule

function getLocaleISOString(date) {
	var year = date.getFullYear().toString(10).padStart(4,'0');
	var month = date.getMonth().toString(10).padStart(2,'0');
	var day = date.getDate().toString(10).padStart(2,'0');
	var hour = date.getHours().toString(10).padStart(2,'0');
	var minute = date.getMinutes().toString(10).padStart(2,'0');
	var second = date.getSeconds().toString(10).padStart(2,'0');

	return `${year}${month}${day}T${hour}${minute}${second}Z`;
}

ical.objectHandlers['RRULE'] = function(val, params, curr, stack, line){
  curr.rrule = line;
  return curr
}
var originalEnd = ical.objectHandlers['END'];
ical.objectHandlers['END'] = function (val, params, curr, stack) {
	// Recurrence rules are only valid for VEVENT, VTODO, and VJOURNAL.
	// More specifically, we need to filter the VCALENDAR type because we might end up with a defined rrule
	// due to the subtypes.
	if ((val === "VEVENT") || (val === "VTODO") || (val === "VJOURNAL")) {
		if (curr.rrule) {
			var rule = curr.rrule.replace('RRULE:', '');
			if (rule.indexOf('DTSTART') === -1) {

				if (curr.start.length === 8) {
					var comps = /^(\d{4})(\d{2})(\d{2})$/.exec(curr.start);
					if (comps) {
						curr.start = new Date(comps[1], comps[2] - 1, comps[3]);
					}
				}


				if (typeof curr.start.toISOString === 'function') {
					try {
						// kblankenship1989 - to fix issue #1798, converting all dates to locale time first, then converting back to UTC time
						rule += ';DTSTART=' + getLocaleISOString(curr.start);
					} catch (error) {
						console.error("ERROR when trying to convert to ISOString", error);
					}
                } else {
                    console.error("No toISOString function in curr.start", curr.start);
				}
			}
			curr.rrule = rrule.fromString(rule);
		}
	}
  return originalEnd.call(this, val, params, curr, stack);
}