/*!
 * FullCalendar v1.6.7 Google Calendar Plugin
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */
 
(function($) {


var API_BASE = 'https://www.googleapis.com/calendar/v3/calendars';
var fc = $.fullCalendar;
var formatDate = fc.formatDate;
var parseISO8601 = fc.parseISO8601;
var cloneDate = fc.cloneDate;
var addDays = fc.addDays;
var applyAll = fc.applyAll;


fc.sourceNormalizers.push(function(sourceOptions) {
	var googleCalendarId = sourceOptions.googleCalendarId;
	var url = sourceOptions.url;
	var match;

	// if the Google Calendar ID hasn't been explicitly defined
	if (!googleCalendarId && url) {

		// detect if the ID was specified as a single string
		if ((match = /^[^\/]+@([^\/]+\.)?calendar\.google\.com$/.test(url))) {
			googleCalendarId = url;
		}
		// try to scrape it out of a V1 or V3 API feed URL
		else if (
			(match = /^https:\/\/www.googleapis.com\/calendar\/v3\/calendars\/([^\/]*)/.exec(url)) ||
			(match = /^https?:\/\/www.google.com\/calendar\/feeds\/([^\/]*)/.exec(url))
		) {
			googleCalendarId = decodeURIComponent(match[1]);
		}

		if (googleCalendarId) {
			sourceOptions.googleCalendarId = googleCalendarId;
		}
	}


	if (googleCalendarId) { // is this a Google Calendar?

		// make each Google Calendar source uneditable by default
		if (sourceOptions.editable == null) {
			sourceOptions.editable = false;
		}

		// We want removeEventSource to work, but it won't know about the googleCalendarId primitive.
		// Shoehorn it into the url, which will function as the unique primitive. Won't cause side effects.
		// This hack is obsolete since 1.6.7, but keep it so this plugin file is compatible with old versions.
		sourceOptions.url = googleCalendarId;
	}
});


fc.sourceFetchers.push(function(sourceOptions, start, end) {
	if (sourceOptions.googleCalendarId) {
		return transformOptions(sourceOptions, start, end);
	}
});


function transformOptions(sourceOptions, start, end) {
	var url = API_BASE + '/' + encodeURIComponent(sourceOptions.googleCalendarId) + '/events?callback=?'; // jsonp
	var apiKey = sourceOptions.googleCalendarApiKey;
	var ctz = sourceOptions.currentTimezone;
	var success = sourceOptions.success;
	var data;

	function reportError(message, apiErrorObjs) {
		var errorObjs = apiErrorObjs || [ { message: message } ]; // to be passed into error handlers
		var consoleObj = window.console;
		var consoleWarnFunc = consoleObj ? (consoleObj.warn || consoleObj.log) : null;

		// call error handlers
		(sourceOptions.googleCalendarError || $.noop).apply(null, errorObjs);

		// print error to debug console
		if (consoleWarnFunc) {
			consoleWarnFunc.apply(consoleObj, [ message ].concat(apiErrorObjs || []));
		}
	}

	// The API expects an ISO8601 datetime with a time and timezone part.
	// Since the calendar's timezone offset isn't always known, request the date in UTC and pad it by a day on each
	// side, guaranteeing we will receive all events in the desired range, albeit a superset.
	start = addDays(cloneDate(start), -1);
	end = addDays(cloneDate(end), 1);

	if (!apiKey) {
		reportError("Specify a googleCalendarApiKey. See http://fullcalendar.io/docs1/google_calendar/");
		return {}; // an empty source to use instead. won't fetch anything.
	}

	data = $.extend({}, sourceOptions.data || {}, {
		key: apiKey,
		timeMin: formatDate(start, 'u'),
		timeMax: formatDate(end, 'u'),
		singleEvents: true,
		maxResults: 9999
	});
	
	if (ctz) {
		data.timeZone = ctz = ctz.replace(' ', '_');
	}

	return $.extend({}, sourceOptions, {
		googleCalendarId: null, // prevents source-normalizing from happening again
		url: url,
		data: data,
		startParam: false, // `false` omits this parameter. we already included it above
		endParam: false, // same
		success: function(data) {
			var events = [];
			var successArgs;
			var successRes;

			if (data.error) {
				reportError('Google Calendar API: ' + data.error.message, data.error.errors);
			}
			else if (data.items) {
				$.each(data.items, function(i, entry) {
					var allDay = !entry.start.dateTime && !entry.end.dateTime;
					var start = parseISO8601(entry.start.dateTime || entry.start.date, true);
					var end = parseISO8601(entry.end.dateTime || entry.end.date, true);
					var url = entry.htmlLink;

					if (allDay) {
						addDays(end, -1); // make inclusive
					}

					if (ctz) {
						url += (url.indexOf('?') == -1 ? '?' : '&') + 'ctz=' + ctz;
					}

					events.push({
						id: entry.id,
						title: entry.summary,
						allDay: allDay,
						start: start,
						end: end,
						url: url,
						location: entry.location,
						description: entry.description
					});
				});

				// call the success handler(s) and allow it to return a new events array
				successArgs = [ events ].concat(Array.prototype.slice.call(arguments, 1)); // forward other jq args
				successRes = applyAll(success, this, successArgs);
				if ($.isArray(successRes)) {
					return successRes;
				}
			}

			return events;
		}
	});
	
}


// legacy
fc.gcalFeed = function(url, sourceOptions) {
	return $.extend({}, sourceOptions, { url: url });
};


})(jQuery);