// sonarr's events. The tool runtime imports this once the broker is bound. It watches the download
// queue and turns its comings and goings into mesh events.
//
// Emits (novox/hq ADR 0041/0042):
//   module.sonarr.episode.grabbed     — a release entered the queue (Sonarr grabbed it)
//   module.sonarr.download.completed   — a release left the queue, imported. This exact routing key
//                                        is what the plex module consumes (module.*.download.completed)
//                                        to rescan, so the new episode becomes a visible item.
// Consumes: none.
//
// The queue is polled and diffed, primed silently on the first look (like plex's index.ts) so a
// restart mid-download does not re-announce everything already in flight as freshly grabbed.

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

// Building the client throws when Sonarr has no URL/key yet. Like the tools (see tools/index.ts),
// the events entrypoint must not crash the runtime for that — it stays idle until configured.
function buildClient(): SonarrClient | null {
  try {
    return SonarrClient.fromEnv();
  } catch {
    return null;
  }
}

const sonarr = buildClient();

// Sonarr removes an item from the queue once it has been imported; a "warning"/"failed" status is
// how a stuck or broken grab shows itself, so we do not call those a completion when they vanish.
const FAILED_STATUSES = new Set(["failed", "warning"]);

const inQueue = new Map<number, SonarrQueueItem>();
let primed = false;

async function pollQueue(sonarr: SonarrClient): Promise<void> {
  const { items } = await sonarr.getQueue();
  const now = new Map(items.map((i) => [i.id, i]));

  if (primed) {
    // Entered the queue since last look — Sonarr grabbed a release.
    for (const [id, item] of now) {
      if (!inQueue.has(id)) await emit("module.sonarr.episode.grabbed", { title: item.title, status: item.status });
    }
    // Left the queue — imported and done, unless it was last seen failing.
    for (const [id, item] of inQueue) {
      if (!now.has(id) && !FAILED_STATUSES.has(item.status)) {
        await emit("module.sonarr.download.completed", { title: item.title });
      }
    }
  }

  inQueue.clear();
  for (const [id, item] of now) inQueue.set(id, item);
  primed = true;
}

const tick = (fn: () => Promise<void>, everyMs: number): void => {
  const run = (): void => void fn().catch((err) => console.error(`[sonarr] ${err}`));
  setInterval(run, everyMs);
  run();
};

if (sonarr) {
  tick(() => pollQueue(sonarr), 30_000);
  console.log("[sonarr] watching the download queue, emitting grabs and completions");
} else {
  console.log("[sonarr] not configured — events idle until an API key is available");
}