// home-assistant's provisions step — run once by the host after Home Assistant starts, and again
// whenever a binding or pair credential it reads changes (the container's `restart-on`, novox/hq
// ADR 0099). It points Home Assistant's MQTT integration at the `mqtt-topic` broker and its Sonarr,
// Radarr and Lidarr integrations at the `sonarr-api`, `radarr-api` and `lidarr-api` apps, through
// Home Assistant's own config flows (connections.ts). It connects to no mesh broker.
//
// Exits non-zero when anything could not be put right, so the node reports the step failed and the
// host runs it again on the next apply. Declared last in the manifest, so its failing gates nothing
// else of home-assistant's (novox/hq ADR 0136). Never prints a key or password.

import { join } from "node:path";

import { APPS, MQTT_PROVISION, reconcileApp, reconcileMqtt, type Outcome } from "./connections.js";
import { HassApi } from "./hass.js";
import { marksIn, readBinding, readIfThere } from "./mesh.js";
import { probeBroker } from "./probe.js";

const dir = process.env.MESH_PROVISIONS_DIR ?? "/run/provisions";
const url = process.env.MESH_HOMEASSISTANT_URL ?? "http://127.0.0.1:8123";
const token = (await readIfThere(process.env.MESH_HOMEASSISTANT_TOKEN_FILE))?.trim() ?? "";
const marks = marksIn(process.env.MESH_WRITTEN_DIR ?? "/var/lib/home-assistant-provisions");
const waitSeconds = Number(process.env.MESH_HOMEASSISTANT_WAIT_SECONDS ?? "300");

if (!token) {
  console.error("[hass-provisions] no Home Assistant token — home-assistant's own `token` secret has not been accepted");
  process.exit(1);
}

/** Home Assistant answers /api/ with 200 once it is up and the token is good. */
async function ready(): Promise<boolean> {
  const until = Date.now() + waitSeconds * 1000;
  for (;;) {
    try {
      const res = await fetch(`${url.replace(/\/$/, "")}/api/`, { headers: { Authorization: `Bearer ${token}` } });
      if (res.status === 200) return true;
      if (res.status === 401 || res.status === 403) {
        console.error("[hass-provisions] Home Assistant refuses the token — accept a long-lived access token it issued");
        return false;
      }
    } catch {
      // not listening yet
    }
    if (Date.now() >= until) return false;
    await new Promise((r) => setTimeout(r, 3000));
  }
}

if (!(await ready())) {
  console.error(`[hass-provisions] Home Assistant did not answer at ${url} within ${waitSeconds}s`);
  process.exit(1);
}

const hass = new HassApi(url, token);
const read = async (p: string) => [await readBinding(join(dir, `${p}.json`)), await readIfThere(join(dir, `${p}.secret`))] as const;

const outcomes: Outcome[] = [];
{
  const [binding, secret] = await read(MQTT_PROVISION);
  outcomes.push(await reconcileMqtt({ hass, probe: probeBroker, marks }, binding, secret));
}
for (const spec of APPS) {
  const [binding, secret] = await read(spec.provision);
  outcomes.push(await reconcileApp({ hass, http: { fetch: (u, init) => fetch(u, init) } }, spec, binding, secret));
}

let failed = 0;
for (const o of outcomes) {
  switch (o.result) {
    case "unchanged":
      console.log(`[hass-provisions] ${o.what}: already as the mesh says${o.note ? ` — ${o.note}` : ""}`);
      break;
    case "written":
      console.log(`[hass-provisions] ${o.what}: wrote ${o.fields.join(", ")}; Home Assistant's own test passed${o.note ? ` — ${o.note}` : ""}`);
      break;
    case "equivalent":
      console.log(`[hass-provisions] ${o.what}: ${o.note}`);
      break;
    case "refused":
      failed++;
      console.error(`[hass-provisions] ${o.what}: ${o.problem}`);
      break;
  }
}
process.exitCode = failed > 0 ? 1 : 0;