const connections = [];

function broadcast (message, sender) {
	message.rtc = true;
	const body = JSON.stringify(message);
	for (const socket of connections) {
		if (socket != sender) {
			socket.send(body);
		}
	}
}

function unicast (message, socket) {
	message.rtc = true;
	socket.send(JSON.stringify(message));
}

function addConnection (socket) {
	if (!connections.includes(socket)) {
		const peerId = Math.round(Math.random()*1000000000);
		const otherPeers = connections.map(c => c.peerId);
		broadcast({newPeer: peerId}, socket);
		unicast({peerId, otherPeers}, socket);
		socket.peerId = peerId;
		connections.push(socket);
	}
}

function removeConnection (socket) {
	const pos = connections.indexOf(socket);

	if (pos != -1) {
		connections.splice(pos, 1);
	}
}

function handler (socket, message) {
	try {
		const payload = JSON.parse(message);
		if (payload.rtc === true) {
			console.log("RTC Message", payload);
			if ("to" in payload) {
				const dest = connections.find(c => c.peerId == payload.to);
				if (dest) {
					unicast(payload, dest);
				}
			} else {
				broadcast(payload, socket);
			}
		}
	} catch (err) {
		console.error("Invalid message", message, err);
	}
}

module.exports = {
	addConnection,
	removeConnection,
	handler
};