var chat = {
	username:     "<not set>",
	topic:        "0xfeedbabe",
	key:          "",
	identity:     "",
	pollInterval: null,
	filter:       null,

	setUsername: function(name) {
		this.username = name;
		return true;
	},

	join: function(password) {
		// create key from shared secret
		this.key = shh.generateSymKeyFromPassword(password);

		// create pub/priv key for identity
		this.identity = shh.newKeyPair();

		pubKey = shh.getPublicKey(this.identity);
		console.log("identity", pubKey.substr(2, 8));

		// create message filter (console doesn't support subscriptions)
		me = this;
		this.filter = shh.newMessageFilter({
			symKeyID: this.key,
			topics:   [this.topic],
		}, function(err, message) {
			if (err) {
				console.error(err);
			} else {
				printMessage(message, me.username);
			}
		});

		this.say("joined");

		return true;
	},

	pollMessages: function() {
		messages = shh.getFilterMessages(this.filter);
		for (i = 0; i < messages.length; i++) {
			printMessage(messages[i], this.username);
		}
	}

	say: function(text) {
		message = {
			symKeyId: this.key,
			topic: this.topic,
			payload: web3.toHex(this.username + ": " + text),
			powTime: 5,
			powTarget: shh.info().minPow,
			sig: this.identity
		};

		return shh.post(message);
	}

	leave: function() {
		shh.deleteMessageFilter(this.filter);
		clearInterval(this.pollInterval);
		this.say("left...")
		console.log("chat room left");
		return true;
	},
}

// start helper functions
function time(message) {
	date = new Date(message.timestamp * 1000);
	hours = date.getHours();
	minutes = "0" + date.getMinutes();
	seconds = "0" + date.getSeconds();

	return hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);
}

function sender(message) {
	return message.sig.substr(2, 8)
}

function printMessage(message, myUsername) {
	line = web3.toAscii(message.payload);
	parts = line.split(":");
	name = parts[0]
	if (name !== myUsername) {
		console.log("[" + time(message) + " " + name + "/" + sender(message) + "]" + parts.slice(1).join(":"));
	}
}
// end helper functions

console.log("Supported functions:");
console.log("* chat.setUsername(<name:string>)");
console.log("* chat.join(<password:string>)");
console.log("* chat.leave()");
console.log("* chat.say(<message:string>)");
console.log();