// icecast's events. The tool runtime imports this once the broker is bound. It watches the streaming
// server and announces when a mountpoint goes live or drops.
//
// Emits (novox/hq ADR 0046/0047):
//   module.icecast.stream.started / .stopped   — a mountpoint appeared or disappeared
//
// A mountpoint exists only while a source is connected, so the set of mounts diffed over time is
// exactly the set of live streams. Primed silently on the first look, so streams already running when
// this starts are not announced as freshly begun. Polling is unhurried — a stream a few seconds late
// is still the event, and hammering the status endpoint buys immediacy nobody asked for.

import { emit } from "@novox/mesh-sdk/events";
import { IcecastClient, type IcecastMount } from "./client.js";

const icecast = IcecastClient.fromEnv();

const live = new Map<string, IcecastMount>();
let primed = false;

async function pollMounts(): Promise<void> {
  const { mounts } = await icecast.getStatus();
  const now = new Map(mounts.map((m) => [m.mount, m]));
  if (primed) {
    for (const [mount, m] of now) {
      if (!live.has(mount)) {
        await emit("module.icecast.stream.started", {
          mount,
          name: m.name,
          description: m.description,
          bitrate: m.bitrate,
        });
      }
    }
    for (const [mount, m] of live) {
      if (!now.has(mount)) {
        await emit("module.icecast.stream.stopped", { mount, name: m.name });
      }
    }
  }
  live.clear();
  for (const [mount, m] of now) live.set(mount, m);
  primed = true;
}

const run = (): void => void pollMounts().catch((err) => console.error(`[icecast] ${err}`));
setInterval(run, 15_000);
run();

console.log("[icecast] watching mountpoints for streams starting and stopping");