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(function () {
const log = document.getElementById("log");
const form = document.getElementById("chat-form");
const input = document.getElementById("msg");
const status = document.getElementById("status");
const me = document.getElementById("me").textContent.trim();
let socket;
let reconnectDelay = 500;
function el(tag, className, text) {
const node = document.createElement(tag);
if (className) node.className = className;
if (text !== undefined) node.textContent = text;
return node;
}
function atBottom() {
return log.scrollHeight - log.scrollTop - log.clientHeight < 40;
}
function append(node) {
const stick = atBottom();
log.appendChild(node);
if (stick) log.scrollTop = log.scrollHeight;
}
function fmtTime(ms) {
if (!ms) return "";
const d = new Date(ms);
return d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
}
function renderChat(msg) {
const line = el("div", "chat-line");
if (msg.nick === me) line.classList.add("mine");
line.appendChild(el("span", "chat-nick", msg.nick));
line.appendChild(el("span", "chat-body", " " + msg.body));
line.appendChild(el("span", "chat-time", " " + fmtTime(msg.at)));
append(line);
}
function renderSystem(msg) {
append(el("div", "chat-system", msg.body));
}
function handle(msg) {
switch (msg.type) {
case "history":
log.innerHTML = "";
(msg.history || []).forEach(renderChat);
break;
case "chat":
renderChat(msg);
break;
case "system":
renderSystem(msg);
break;
}
}
function connect() {
const proto = location.protocol === "https:" ? "wss" : "ws";
socket = new WebSocket(`${proto}://${location.host}/ws`);
socket.onopen = function () {
status.textContent = "connected ✓";
status.className = "status ok";
reconnectDelay = 500;
};
socket.onmessage = function (event) {
try {
handle(JSON.parse(event.data));
} catch (e) {
console.error("bad message", e);
}
};
socket.onclose = function () {
status.textContent = "reconnecting…";
status.className = "status";
setTimeout(connect, reconnectDelay);
reconnectDelay = Math.min(reconnectDelay * 2, 8000);
};
socket.onerror = function () {
socket.close();
};
}
form.addEventListener("submit", function (e) {
e.preventDefault();
const body = input.value.trim();
if (!body || !socket || socket.readyState !== WebSocket.OPEN) return;
socket.send(JSON.stringify({ type: "chat", body: body }));
input.value = "";
});
connect();
})();
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