// Constants and variables
// const wsUri = "ws://localhost:32715";
const wsUri = "wss://chat.glitch-in.space:443/ws/";
let websocket;


// Initialization
function init() {
	console.log("Init...");
	openWebSocket();
}

// Open WebSocket
function openWebSocket() {
	websocket = new WebSocket(wsUri);
	websocket.onopen = function(evt) { onOpen(evt) };
	websocket.onclose = function(evt) { onClose(evt) };
	websocket.onmessage = function(evt) { onMessage(evt) };
	websocket.onerror = function(evt) { onError(evt) };
}

// WebSocket event handlers
function onOpen(evt) {
	console.log("Connected to " + wsUri + ".");

	// Send init command containing chat ID and nickname
	sendInit();
}

function onClose(evt) {
	console.log("Connection closed (code " + evt.code + ").");
}

function onMessage(evt) {
	console.log("Received: " + evt.data);
	parseMessage(evt.data);
}

function onError(evt) {
	console.error("Connection error: ", evt);
}

// Command senders
function sendInit() {
	// Define command as JSON object
	let initObj = {
		action: "init",
		chat_id: "42",
		nickname: "binaryDiv"
	};

	// Send command as JSON string
	let initJson = JSON.stringify(initObj);
	console.log("Sending init: " + initJson);
	websocket.send(initJson);
}

// Message parsing
function parseMessage(msgString) {
	try {
		let msg = JSON.parse(msgString);

		switch (msg.type) {
			// Response to "init" command
			case "init":
				// TODO
				console.log("Got init response: ", msg);
				break;

			// Incoming chat message
			case "message":
				// TODO
				console.log("Got message event: from '" + msg.from + "', text '" + msg.text + "'");
				break;

			// TODO Topic change, user join/leave, error, ...

			default:
				console.error("Unknown message type '" + msg.type + "'");
		}
	}
	catch (e) {
		console.error("Error parsing message JSON: " + e.message);
	}
}

// Run script after page is loaded
$(function() {
	init();
});