import { fileURLToPath } from 'node:url';
import { realpathSync } from 'node:fs';
import { serve } from '@hono/node-server';
import { serveStatic } from '@hono/node-server/serve-static';
import { Hono } from 'hono';
import { healthRouter } from './routes/health.js';
import { meRouter } from './routes/me.js';
import { eventsRouter } from './routes/events.js';
import { sseRouter } from './routes/sse.js';
import { listsRouter, listItemsRouter } from './routes/lists.js';
import { pushRouter } from './routes/push.js';
import { oidcAuthMiddleware, processOAuthCallback } from './auth/middleware.js';
import { devAuthBypass } from './auth/devBypass.js';
import { persistSessionCookie } from './auth/persistSessionCookie.js';
import { startBrokerPoller } from './broker/poller.js';
import { startOutboxWorker, initOutboxTrigger } from './broker/outboxWorker.js';
import { startReminderScheduler } from './broker/reminderScheduler.js';
import webpush from 'web-push';

export const app = new Hono();

// Compute once at startup: bypass is active only in non-production with explicit opt-in.
// In production NODE_ENV='production' → devBypassActive=false → OIDC is always mounted.
const devBypassActive =
  process.env.NODE_ENV !== 'production' && process.env.DEV_AUTH_BYPASS === 'true';

if (devBypassActive) {
  console.warn('⚠ DEV_AUTH_BYPASS active — OIDC guard DISABLED. Never use in production.');
}

// OIDC callback — must be registered BEFORE oidcAuthMiddleware so the
// authorization-code exchange is not itself intercepted by the auth check (T-02-02)
app.get('/callback', (c) => processOAuthCallback(c));

// GET /health — unauthenticated, mounted BEFORE the OIDC guard (T-01-03, T-02-05)
app.route('/health', healthRouter);

// Dev-auth bypass — no-op passthrough unless DEV_AUTH_BYPASS=true AND NODE_ENV!='production'.
// When active, injects DEV_USER into the Hono context and the OIDC guard is NOT mounted.
// Must be mounted BEFORE oidcAuthMiddleware (T-02-01 mitigation; see auth/devBypass.ts).
app.use('/api/*', devAuthBypass());

// Protect all /api/* routes with OIDC session middleware (AUTH-01, T-02-05).
// Skipped entirely when devBypassActive so that local dev works without Authelia.
// In production devBypassActive is always false — OIDC is unconditionally mounted.
// Unauthenticated requests receive a 302 redirect to Authelia's authorize endpoint.
// OIDC_AUTH_EXTERNAL_URL is MANDATORY behind Pangolin to construct the correct
// redirect_uri (Pitfall 1). Set it to https://familysync.<domain>.
if (!devBypassActive) {
  app.use('/api/*', oidcAuthMiddleware());
  // Re-issues the session-scoped oidc-auth cookie as persistent so PWA sessions survive close (AUTH-02).
  app.use('/api/*', persistSessionCookie());
}

// Protected API routes (behind oidcAuthMiddleware)

// GET /api/login — login entry point for the PWA.
// Flow (production): unauthenticated top-level nav hits the OIDC guard above,
// which 302-redirects to Authelia. After login, Authelia POSTs to /callback,
// the middleware sets a `continue` cookie pointing back to /api/login, and the
// browser follows it here — now authenticated. The handler then redirects to /
// so the SPA boots with a valid session. Under DEV_AUTH_BYPASS the guard is not
// mounted, so /api/login reaches this handler directly and still redirects to /.
app.get('/api/login', (c) => c.redirect('/'));

app.route('/api/me', meRouter);
app.route('/api/events', eventsRouter);
app.route('/api/sse', sseRouter);
app.route('/api/lists', listsRouter);
app.route('/api/list-items', listItemsRouter);
app.route('/api/push', pushRouter);

// WR-04: background worker startup (cron schedules) moved into the isMainModule()
// guard below. Calling them at top level registered real node-cron schedules whenever
// ./index.js was imported — the route tests import `app` from here, so the poller/outbox
// drain fired during the test run, touched the mocked DB/CalDAV layers nondeterministically,
// and left open handles that blocked clean process exit. They now start only when the
// module is the process entrypoint.

// Serve React PWA static assets from ./public (Vite build output).
// MUST serve the whole ./public tree, not just /assets/* — root-level PWA files
// (manifest.webmanifest, sw.js, registerSW.js, workbox-*.js, icon-*.png,
// apple-touch-icon.png) live at the root. serveStatic calls next() when a file
// is not found, so SPA routes fall through to the index.html catch-all below.
// (Registered AFTER /health, /api/*, and /callback, so those win.)
app.use('/*', serveStatic({ root: './public' }));
app.get('*', serveStatic({ path: './public/index.html' }));

/**
 * True only when this module is the process entrypoint (run directly), not when it
 * is imported (e.g. by route tests that import `app`).
 *
 * WR-05: the previous basename-tail comparison
 *   import.meta.url.endsWith(process.argv[1].replace(/^.*\//, ''))
 * was fragile — a symlinked entrypoint or a differently-located file sharing the same
 * basename could make it mis-fire (start the server during an unrelated import, or fail
 * to start it in production). Compare fully-resolved real paths instead. realpathSync
 * resolves symlinks on argv[1]; fileURLToPath turns the module URL into a real path.
 */
function isMainModule(): boolean {
  if (!process.argv[1]) return false;
  try {
    return fileURLToPath(import.meta.url) === realpathSync(process.argv[1]);
  } catch {
    return false;
  }
}

// Only start the HTTP server AND background workers when this module is run directly
// (not imported in tests). WR-04: gating the cron schedules here keeps them out of the
// test process.
if (isMainModule()) {
  // Configure VAPID credentials for web-push before starting background workers.
  // VAPID_SUBJECT must be a mailto: or https: URL identifying the operator.
  // The private key is NEVER served to clients; it signs push requests server-side only.
  const vapidSubject = process.env.VAPID_SUBJECT ?? '';
  const vapidPublicKey = process.env.VAPID_PUBLIC_KEY ?? '';
  const vapidPrivateKey = process.env.VAPID_PRIVATE_KEY ?? '';
  if (vapidSubject && vapidPublicKey && vapidPrivateKey) {
    try {
      webpush.setVapidDetails(vapidSubject, vapidPublicKey, vapidPrivateKey);
    } catch (err) {
      console.warn(
        '[startup] setVapidDetails failed — push notifications will not work:',
        err instanceof Error ? err.message : String(err),
      );
    }
  } else {
    console.warn(
      '[startup] VAPID env vars not set — push notifications will fail. Set VAPID_SUBJECT, VAPID_PUBLIC_KEY, VAPID_PRIVATE_KEY.',
    );
  }

  // Start the CalDAV broker poller (5-min cron, D-13 ctag change-detection).
  // Runs in the background — errors are caught and logged per-credential (T-03-04).
  startBrokerPoller();
  // Drain the D-05 outbox every 15s: dispatches pending CalDAV writes to Fastmail.
  startOutboxWorker();
  initOutboxTrigger(); // subscribe drain signal listener (D-01)
  // Start the 1-min reminder scan for shared timed events starting in ~15 min (NOTIF-01).
  // VAPID must be configured (above) before this starts or push sends will fail.
  startReminderScheduler();

  serve({ fetch: app.fetch, port: 3000 }, (info) => {
    console.log(`FamilySync API running on http://localhost:${info.port}`);
  });
}