'use strict';
require('dotenv').config();
const path = require('path');
const express = require('express');
const session = require('express-session');
const SqliteStore = require('better-sqlite3-session-store')(session);

const { db, init, migrate } = require('./db');
const { seedDefaults } = require('./lib/templates');
const { requireAuth, requireAdmin } = require('./middleware/auth');

init();
migrate();
seedDefaults();

const app = express();
app.disable('x-powered-by');
app.set('trust proxy', 1);

app.use(express.json({ limit: '2mb' }));
app.use(express.urlencoded({ extended: true }));

app.use(session({
  store: new SqliteStore({
    client: db,
    expired: { clear: true, intervalMs: 15 * 60 * 1000 },
  }),
  secret: process.env.SESSION_SECRET || 'change-me-in-production',
  resave: false,
  saveUninitialized: false,
  cookie: {
    httpOnly: true,
    sameSite: 'lax',
    secure: String(process.env.COOKIE_SECURE || 'false') === 'true',
    maxAge: 1000 * 60 * 60 * 8, // 8h
  },
}));

// ---- First-boot setup gate -------------------------------------------
// While the instance has no users, every page redirects to the setup wizard
// so the first administrator can be created through the browser.
const setup = require('./routes/setup');
app.use('/api/setup', setup.router);

app.use((req, res, next) => {
  const url = req.originalUrl || req.url;
  // Always allow the setup API, the wizard page itself, and static assets
  // (css/js) — otherwise the wizard could not render.
  if (url.startsWith('/api/setup') || url.startsWith('/setup.html') ||
      url.startsWith('/css/') || url.startsWith('/js/') || url.startsWith('/assets/')) return next();

  if (setup.needsSetup()) {
    if (url.startsWith('/api/')) {
      return res.status(503).json({ error: 'Setup required. Open the site in a browser to create the administrator account.' });
    }
    return res.redirect('/setup.html');
  }
  // Setup is done — the wizard must never be reachable again.
  next();
});

// ---- API routes -------------------------------------------------------
app.use('/api/auth', require('./routes/auth'));
app.use('/api/manage', require('./routes/manage'));   // admin only (enforced inside)
app.use('/api/datacreate', require('./routes/datacreate')); // admin only (enforced inside)
app.use('/api/users', require('./routes/users'));     // admin only (enforced inside)
app.use('/api/versions', require('./routes/versions')); // read: all users, write: admin
app.use('/api/mail', require('./routes/mail'));       // admin only (enforced inside)
app.use('/api/legislation', require('./routes/legislation')); // read: all users, write: admin
app.use('/api/storage', require('./routes/storage'));  // admin only (enforced inside)
app.use('/api/data', require('./routes/data'));
app.use('/api/logs', require('./routes/logs'));       // admin only (enforced inside)
app.use('/settings', require('./routes/settings'));   // brand images served here

// ---- Page gating ------------------------------------------------------
// Serve the login page and static assets openly; gate the app pages.
const PUB = path.join(__dirname, 'public');
app.get('/', (req, res) => res.redirect(req.session.user ? '/view-data.html' : '/login.html'));

// The setup wizard is only reachable while no users exist.
app.get('/setup.html', (req, res) => {
  if (!setup.needsSetup()) return res.redirect('/login.html');
  res.sendFile(path.join(PUB, 'setup.html'));
});

// Protect the admin-only HTML pages at the route level too (defence in depth)
app.get('/data-management.html', requireAuth, requireAdmin, (req, res) =>
  res.sendFile(path.join(PUB, 'data-management.html')));
app.get('/storage.html', requireAuth, requireAdmin, (req, res) =>
  res.sendFile(path.join(PUB, 'storage.html')));
app.get('/logs.html', requireAuth, requireAdmin, (req, res) =>
  res.sendFile(path.join(PUB, 'logs.html')));
// Signed-in pages
app.get('/view-data.html', requireAuth, (req, res) =>
  res.sendFile(path.join(PUB, 'view-data.html')));
app.get('/calendar-view.html', requireAuth, (req, res) =>
  res.sendFile(path.join(PUB, 'calendar-view.html')));
app.get('/account.html', requireAuth, (req, res) =>
  res.sendFile(path.join(PUB, 'account.html')));
app.get('/version-control.html', requireAuth, requireAdmin, (req, res) =>
  res.sendFile(path.join(PUB, 'version-control.html')));
app.get('/legislation.html', requireAuth, (req, res) =>
  res.sendFile(path.join(PUB, 'legislation.html')));

app.use(express.static(PUB)); // login.html, css, js, assets

// ---- 404 / errors -----------------------------------------------------
app.use((req, res) => res.status(404).send('Not found.'));
app.use((err, req, res, next) => {
  console.error(err);
  if (res.headersSent) return next(err);
  res.status(500).json({ error: err.message || 'Server error' });
});

const PORT = Number(process.env.PORT || 3000);
app.listen(PORT, () => {
  console.log(`Infosec v2.3 running on http://localhost:${PORT}`);
});