var INFO = {
	PHP_SESSION_NAME: "PHPSESSID",
	SAFARI_AUTH_URL: "/safari.php",
	APP_ID: "your app id"
};

$(function () {

	initFacebook(function () {
		var authResponse = FB.getAuthResponse();

		var fields = [];
		var cookieName = "fbsr_" + INFO.APP_ID;
		fields['session_id'] = cookie(INFO.PHP_SESSION_NAME);
		fields['auth_response'] = authResponse || 0;
		fields['app_id'] = INFO.APP_ID;

		$.post(
			INFO.SAFARI_AUTH_URL,
			$.param(fields),
			function (response) {
				// make sure the cookie has been set
				var sessionId = cookie(INFO.PHP_SESSION_NAME);
				console.log(sessionId);
				var authResponse = cookie(cookieName);
				console.log(authResponse);
			},
			'json'
		);
	});
});


/**
 * Gets, sets or a deletes a cookie
 * @param name
 *   The name of the cookie
 * @param value
 *   Optional. If passed, this is the new value of the cookie.
 *   If null is passed here, the cookie is "deleted".
 * @param options
 *   Optional hash of options, including:
 *   "expires": number of milliseconds until expiration. Defaults to session cookie.
 *   "domain": the domain to set cookie
 *   "path": path to set cookie. Defaults to location.pathname
 * @return String
 *   If only name was passed, returns the stored value of the cookie, or null.
 */
function cookie(name, value, options) {
	if (typeof value != 'undefined') {
		var path, parts, domain = '';
		parts = Q.info.baseUrl.split('://');
		if (options && ('path' in options)) {
			path = ';path='+options.path;
		} else {
			path = ';path=/' + parts[1].split('/').slice(1).join('/');
		}
		if (options && ('domain' in options)) {
			domain = ';domain='+options.domain;
		} else {
			domain = ';domain=.' + parts[1].split('/').slice(0, 1);
		}
		if (value === null) {
			document.cookie = encodeURIComponent(name)+'=;expires=Thu, 01-Jan-1970 00:00:01 GMT'+path+domain;
			return null;
		}
		var expires = '';
		if (options && options.expires) {
			expires = new Date();
			expires.setTime((new Date()).getTime() + options.expires);
			expires = ';expires='+expires.toGMTString();
		}
		document.cookie = encodeURIComponent(name)+'='+encodeURIComponent(value)+expires+path+domain;
		return null;
	}

	// Otherwise, return the value
	var cookies = document.cookie.split(';');
	var result;
	for (var i=0; i<cookies.length; ++i) {
		parts = cookies[i].split('=');
		result = parts.splice(0, 1);
		result.push(parts.join('='));
		if (decodeURIComponent(result[0].trim()) === name) {
			return result.length < 2 ? null : decodeURIComponent(result[1]);
		}
	}
	return null;
};







function initFacebook(callback) {
	// should be only called once per app
	if (initFacebook.completed[Q.app]) {
		callback();
		return;
	}
	if (!$('#fb-root').length) {
		$('body').append($('<div id="fb-root" />'));
	}
	Q.addScript((window.location.protocol || 'http') + '//connect.facebook.net/en_US/all.js', function () {
		if (!initFacebook.completed[Q.app]) {
			FB.init(Q.extend({
				appId: INFO.APP_ID,
				status: true,
				cookie: true,
				oauth: true,
				xfbml: true
			}));
		}
		initFacebook.completed[Q.app] = true;
		if (callback) {
			callback();
		}
	});
};
initFacebook.completed = {};