led2/lightsync/frontend/app.js

// LightSync frontend — Phase 1 shell
// WebSocket stub + device list loader
// Phase 2 expands audio, transport, and WS protocol

const WS_URL = `ws://${location.host}/ws`;

class LightSyncClient {
    constructor() {
        this.ws = null;
        this.reconnectDelay = 2000;
        this._reconnectTimer = null;
    }

    connect() {
        if (this._reconnectTimer) {
            clearTimeout(this._reconnectTimer);
            this._reconnectTimer = null;
        }

        this.ws = new WebSocket(WS_URL);

        this.ws.onopen = () => {
            document.getElementById("status-dot").className = "status-dot connected";
            document.getElementById("status-text").textContent = "CONNECTED";
        };

        this.ws.onclose = () => {
            document.getElementById("status-dot").className = "status-dot";
            document.getElementById("status-text").textContent = "OFFLINE";
            this._reconnectTimer = setTimeout(() => this.connect(), this.reconnectDelay);
        };

        this.ws.onerror = () => {
            document.getElementById("status-dot").className = "status-dot error";
        };

        this.ws.onmessage = (event) => {
            const msg = JSON.parse(event.data);
            this.handleMessage(msg);
        };
    }

    handleMessage(msg) {
        // Phase 2 will dispatch on msg.type
        console.debug("[ws]", msg);
    }

    send(msg) {
        if (this.ws?.readyState === WebSocket.OPEN) {
            this.ws.send(JSON.stringify(msg));
        }
    }
}

const client = new LightSyncClient();
client.connect();

// Load device list on startup
async function loadDevices() {
    try {
        const res = await fetch("/api/devices");
        if (!res.ok) throw new Error(`HTTP ${res.status}`);
        const devices = await res.json();
        const list = document.getElementById("device-list");
        if (devices.length === 0) {
            list.innerHTML = '<span class="text-dim">no devices registered</span>';
            return;
        }
        list.innerHTML = devices.map(d =>
            `<div class="device-row">
                <span class="text-accent">${escapeHtml(d.name)}</span>
                <span class="text-dim">${escapeHtml(d.strip_type)} / ${d.led_count} LEDs / ${escapeHtml(d.ip)}:${d.port}</span>
            </div>`
        ).join("");
    } catch (err) {
        const list = document.getElementById("device-list");
        list.innerHTML = `<span class="text-dim">error loading devices</span>`;
        console.error("[devices]", err);
    }
}

function escapeHtml(str) {
    const div = document.createElement("div");
    div.appendChild(document.createTextNode(String(str)));
    return div.innerHTML;
}

loadDevices();