var USER = {
	xhr: new XMLHttpRequest(),
	devid: getUrlArg("devid"),
	user: getUrlArg("user"),
	userb64: null,
	info: null,
	save : function()
	{
		setCookie("user", this.userb64, 365);
	},
	load : function(callback)
	{
		this.xhr.onreadystatechange = function() {
			if (this.readyState != 4) return;
			if (this.status == 404) {
				if (!USER.devid) {
					USER.devid = window.prompt("Please enter your device ID");
				}
				self.setTimeout(callback, 0);
				return;
			} else if (this.status != 200) {
				if (this.status) {
					alert("Server under maintenance (status: " + this.status + ")");
				}
				return;
			}
			if (!USER.devid) USER.devid = getCookie("devid");
			USER.info = JSON.parse(this.responseText);
			if (USER.info && USER.info.devid) {
				if (USER.devid) {
					var found = false;
					for (var i = 0; i < USER.info.devid.length; i++) {
						if (USER.info.devid[i] == USER.devid) {
							found = true;
							break;
						}
					}
					//if (!found) USER.devid = USER.info.devid[0];
				} else {
					USER.devid = USER.info.devid[0];
				}
				self.setTimeout(callback, 0);
			} else {
                alert("No activated device for the specified user");
				self.setTimeout(callback, 0);
                return;
			}
		}

		this.userb64 = this.user ? btoa(this.user) : getCookie("user");
		if (!this.devid) this.devid = getCookie("devid");
		if (!this.devid) {
			var tosave = false;
			if (!this.userb64) {
				var input = window.prompt("Please enter your email or device ID");
				if (!input) return;
				if (input.indexOf("@") <= 0 && input.indexOf("#") <= 0) {
					this.devid = input;
				} else {
					this.userb64 = btoa(input);
					tosave = true;
				}
			}
			if (this.userb64 && tosave) {
				this.save();
			}
		}
		if (!this.userb64) {
			if (this.devid) {
				self.setTimeout(callback, 0);
			} else {
				alert("Please specify a device ID");
			}		
		} else {
			var url = serverURL + "query?user=" + this.userb64;
			this.xhr.open('GET', url, true);    
			this.xhr.send(null);
		}
	},
	check : function(callback)
	{
		this.xhr.onreadystatechange = function() {
			if (this.readyState != 4) return;
			if (this.status != 200) {
				if (this.status) {
					alert("Server under maintenance (status: " + this.status + ")");
				}
				return;
			}
			USER.info = JSON.parse(this.responseText);
			if (callback) self.setTimeout(callback, 0);
		}

		this.userb64 = this.user ? btoa(this.user) : getCookie("user");
		if (this.userb64) {
			var url = serverURL + "query?user=" + this.userb64;
			this.xhr.open('GET', url, true);    
			this.xhr.send(null);
		} else {
			if (callback) self.setTimeout(callback, 0);
		}
	},
	goDash : function(devid)
	{
		setCookie("devid", devid, 7);
		var s = "?";
		if (this.user) s += "user=" + this.user + "&";
		s += "devid=" + devid;
		location.href = s;
	},
	goNextDash: function(devid)
	{
		if (this.info.devid) {
			for (var i = 0; i < this.info.devid.length; i++) {
				if (this.info.devid[i] == devid) {
					 this.goDash(this.info.devid[(i + 1) % this.info.devid.length]);
					 return;
				}
			}
		}
	}
};