import cookie from "@fastify/cookie";
import jwt from "@fastify/jwt";
import websocket from "@fastify/websocket";
import Fastify, { type FastifyInstance } from "fastify";
import { randomUUID } from "node:crypto";
import { createDb, deviceEvents as deviceEventsTable, type Db } from "@parking/db";
import { TOKEN_COOKIE, requireJwtSecret } from "./auth.js";
import { deviceEvents } from "./device-events.js";
import { EntryFlow } from "./entry-flow.js";
import { EventLog } from "./event-log.js";
import { ExitFlow } from "./exit-flow.js";
import { PayStation } from "./pay-station.js";
import { SubscriptionFlow } from "./subscription-flow.js";
import { ShiftService } from "./shift-service.js";
import { ReadDispatcher } from "./read-dispatch.js";
import { PrinterMonitor } from "./printer-monitor.js";
import { DeviceMonitor } from "./device-monitor.js";
import { buildSigner, buildVerifier } from "./signer.js";
import { authRoutes } from "./routes/auth.js";
import { deviceRoutes } from "./routes/devices.js";
import { eventRoutes } from "./routes/events.js";
import { payRoutes } from "./routes/pay.js";
import { subscriptionRoutes } from "./routes/subscriptions.js";
import { qrReaderRoutes } from "./routes/qr-reader.js";
import { shiftRoutes } from "./routes/shift.js";
import { siteRoutes } from "./routes/site.js";
import { snapshotRoutes } from "./routes/snapshots.js";
import { tariffRoutes } from "./routes/tariffs.js";
import { printerRoutes } from "./routes/printers.js";
import { setupRoutes } from "./routes/setup.js";
import { deviceStatusRoutes } from "./routes/device-status.js";
import { wsRoutes } from "./routes/ws.js";

// The backend is Fastify (Node). Hardware drivers live as isolated Fastify
// plugins emitting onto a shared internal event bus; auth is fully local
// (offline-first). See wiki/entities/fastify.md and local-jwt-auth.md.

export interface BuildOptions {
  db?: Db;
}

export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInstance> {
  const app = Fastify({
    logger: { level: process.env.LOG_LEVEL ?? "info" },
  });

  const db = opts.db ?? createDb();

  await app.register(cookie);

  // WebSocket support for the live booth feed (/api/ws). Registered before the
  // routes so the `{ websocket: true }` route option is available.
  await app.register(websocket);

  // Local JWT signing with a local secret — no external identity provider.
  // Fail fast rather than fall back to a known default: a booth machine started
  // without a real secret would sign tokens anyone could forge (incl. an admin
  // token), defeating the whole local-auth/anti-fraud model. No insecure default.
  // The token is carried in an HttpOnly cookie (not the Authorization header).
  await app.register(jwt, {
    secret: requireJwtSecret(),
    // No expiry: a login is valid until explicit logout — a shift is a separate
    // boundary, not the token lifetime (see auth.ts + wiki/concepts/shift.md).
    cookie: { cookieName: TOKEN_COOKIE, signed: false },
  });

  app.get("/health", async () => ({ status: "ok" }));

  // Local username/password login → JWT in an HttpOnly cookie + CSRF cookie.
  await authRoutes(app, db);

  // Device-agnostic setup: the admin adds controllers (with their relays + entry
  // button) and binds readers/cameras to a controller relay at first-run. There is
  // no lane — a parking lot is one pool with a flexible set of entry/exit points.
  // See wiki/concepts/first-run-setup.md, entry-exit-points.md.
  await setupRoutes(app, db);

  // Inbound device pushes (e.g. Dingtian Input Link URL → button events),
  // guarded by source-IP allowlist + a shared-secret path token, both read from
  // the device's lane_devices config (written on assign).
  await deviceRoutes(app, db);

  // Live printer-status monitor: polls printers (paper/cover/cutter/offline) and
  // pushes changes to the booth UI. setupRoutes() has already registered the
  // built-in drivers the monitor needs. See wiki/concepts/printer-status-monitoring.md.
  const printerMonitor = new PrinterMonitor(db, app.log);
  await printerRoutes(app, printerMonitor);
  app.addHook("onReady", async () => printerMonitor.start());
  app.addHook("onClose", async () => printerMonitor.stop());

  // Unified device-status monitor: polls EVERY configured device (relays/readers/
  // cameras via healthCheck, printers via rich readStatus) and feeds the booth's
  // device-status footer over the WS. Read-only — never drives a relay.
  // See wiki/concepts/device-status-monitoring.md.
  const deviceMonitor = new DeviceMonitor(db, app.log);
  await deviceStatusRoutes(app, deviceMonitor);
  app.addHook("onReady", async () => deviceMonitor.start());
  app.addHook("onClose", async () => deviceMonitor.stop());

  // Append-only signed business LEDGER (ledger_events). Holds only business facts
  // (vehicle_entry/exit, payment, void, …) — the anti-fraud audit trail. A raw
  // button press is NOT a business fact: it's device telemetry, recorded UNSIGNED
  // in device_events. The entry flow (TODO) turns an input into a signed
  // vehicle_entry once a ticket prints + the barrier is commanded.
  // See wiki/decisions/event-streams-split.md.
  // The 4th arg is a read-side fan-out fired AFTER each durable append — used to
  // push the event to live booth clients (WS). It cannot affect the sign/chain path.
  const eventLog = new EventLog(db, buildSigner(app.log), buildVerifier, (row) =>
    deviceEvents.emitLedger(row),
  );
  await eventRoutes(app, db, eventLog);

  // Live booth feed: server-pushed ledger + occupancy + printer-status over a
  // single authenticated WebSocket (/api/ws). See routes/ws.ts.
  await wsRoutes(app, db, deviceMonitor);

  // Entry/exit camera snapshots (BLOB-in-DB), read-only. See snapshot.ts.
  await snapshotRoutes(app, db);

  // Entry flow: a button press → print ticket → signed vehicle_entry → pulseOpen.
  // Subscribes to the SAME input bus as the telemetry writer below; the two are
  // independent (telemetry always records; the entry flow acts only on an access
  // device's rising edge). See wiki/concepts/device-input-flow.md + parking-session.md.
  const entryFlow = new EntryFlow(db, eventLog, app.log);
  const unsubscribeEntry = deviceEvents.onInput((e) => {
    void entryFlow.onInput(e);
  });
  app.addHook("onClose", async () => unsubscribeEntry());

  // Read-driven flows: a credential read (ticket scan / plate / card) routes via the
  // dispatcher to either the SUBSCRIPTION flow (if it matches a subscription) or the
  // transient EXIT flow. See read-dispatch.ts, exit-flow.ts, subscription-flow.ts,
  // parking-session.md.
  const exitFlow = new ExitFlow(db, eventLog, app.log);
  const subscriptionFlow = new SubscriptionFlow(db, eventLog, app.log);
  const readDispatcher = new ReadDispatcher(db, exitFlow, subscriptionFlow, app.log);
  const unsubscribeRead = deviceEvents.onRead((e) => {
    void readDispatcher.dispatch(e);
  });
  app.addHook("onClose", async () => unsubscribeRead());

  // GEE/Dingtian QR reader: it HTTP-GETs on each scan and beeps/acts on our JSON
  // verdict (host-in-the-loop, synchronous). Routes the read through the dispatcher
  // and replies the SDK verdict. See wiki/entities/gee-qr-er80.md, qrcode-sdk.md.
  await qrReaderRoutes(app, db, readDispatcher);

  // Shifts (manned mode): explicit open/close → signed shift_open / shift_z_report
  // (sum payments by tender, print the Z-report). Constructed before the pay routes
  // because the booth money path is GATED on an open shift. See wiki/concepts/shift.md.
  const shiftService = new ShiftService(db, eventLog, app.log);

  // Pay station (pay-on-foot): quote an open session against the active tariff +
  // take payment → signed `payment` event. The booth pay/exit/voucher/re-open
  // endpoints require an open shift (passed in). See wiki/concepts/tariff.md.
  const payStation = new PayStation(db, eventLog, app.log);
  await payRoutes(app, db, payStation, exitFlow, shiftService);

  // Tariff composer: admin publishes effective-dated, immutable rate-card versions
  // the pay station prices against. See wiki/concepts/tariff.md.
  await tariffRoutes(app, db);

  // Subscription admin CRUD. See wiki/entities/subscription.md.
  await subscriptionRoutes(app, db);

  // Shift open/close + drawer endpoints (shiftService constructed above).
  await shiftRoutes(app, shiftService);

  // Site config (capacity) + live occupancy. The FULL gate (refuse transient entry
  // at capacity) is in the entry flow. See wiki/concepts/capacity-occupancy.md.
  await siteRoutes(app, db);

  const unsubscribeInput = deviceEvents.onInput((e) => {
    // Record every input edge as unsigned telemetry, keyed to the device that fired
    // (provenance). No lane — the pool-of-spaces model has none. The entry flow
    // (above) independently decides whether this edge is an entry button.
    try {
      db.insert(deviceEventsTable)
        .values({
          id: randomUUID(),
          deviceId: e.deviceId,
          category: "access",
          kind: "input",
          detail: { driverId: e.driverId, input: e.input, edge: e.edge },
          occurredAt: e.at,
        })
        .run();
    } catch (err) {
      app.log.error(`device-event insert failed: ${(err as Error).message}`);
    }
  });
  app.addHook("onClose", async () => unsubscribeInput());

  return app;
}