// Starts the gateway: connects to every T3 host in the database, serves the watch API, and pushes
// notifications.

import { mkdirSync } from "node:fs";
import { dirname } from "node:path";

import { Apns } from "./apns.ts";
import { createRoutes } from "./api.ts";
import { loadConfig } from "./config.ts";
import { openDb } from "./db.ts";
import { Hub } from "./hub.ts";
import { Notifier } from "./notify.ts";
import { Pusher } from "./push.ts";
import { SummaryCache } from "./views.ts";

const HOST_SYNC_MS = 15_000;
const TOKEN_CHECK_MS = 6 * 60 * 60_000;

const log = (message: string) => console.log(`${new Date().toISOString()} ${message}`);

const startedAt = new Date().toISOString();
const config = loadConfig();
mkdirSync(dirname(config.dbPath), { recursive: true });
const db = openDb(config.dbPath);
const cache = new SummaryCache(log);
const apns = config.apns ? new Apns(config.apns) : null;
if (!apns) log("APNs is not configured. Pushes will only be logged.");

const pusher = new Pusher(db, apns, log);

const notifier = new Notifier(pusher.sendAll, cache, log);
const hub = new Hub(db, { onThreadChange: notifier.onThreadChange, onStatus: notifier.onHostStatus, log });
hub.sync();
setInterval(() => hub.sync(), HOST_SYNC_MS);
notifier.checkTokenExpiry(hub.rows());
setInterval(() => notifier.checkTokenExpiry(hub.rows()), TOKEN_CHECK_MS);

const server = Bun.serve({
  port: config.port,
  routes: createRoutes({ db, hub, cache, pusher, startedAt, log }),
  fetch: () => Response.json({ error: "Not found." }, { status: 404 }),
});
log(`WristCode gateway listening on :${server.port} with ${hub.list().length} host(s)`);

for (const signal of ["SIGINT", "SIGTERM"] as const) {
  process.on(signal, () => {
    log(`${signal}: shutting down`);
    void server.stop();
    hub.stop();
    apns?.close();
    db.close();
    process.exit(0);
  });
}