module.exports = function registerAuthRoutes(app, deps) {
  const pool = deps.pool;
  const pages = deps.pages;
  const createUserSession = deps.createUserSession;
  const setSessionCookie = deps.setSessionCookie;
  const clearSessionCookie = deps.clearSessionCookie;
  const parseCookies = deps.parseCookies;
  const hashSessionToken = deps.hashSessionToken;
  const verifyPassword = deps.verifyPassword;
  const sessionCookieName = deps.sessionCookieName;

  app.get('/', function (req, res) {
    res.redirect(req.currentUser ? '/admin' : '/login');
  });

  app.get('/login', function (req, res) {
    if (req.currentUser) {
      return res.redirect('/admin');
    }
    res.send(pages.renderLoginPage(req.query.message ? String(req.query.message) : ''));
  });

  app.post('/login', async function (req, res, next) {
    try {
      const username = String(req.body.username || '').trim();
      const password = String(req.body.password || '');
      if (!username || !password) {
        return res.status(400).send('Username and password are required.');
      }

      const [rows] = await pool.query('SELECT id, name, username, password_hash, password_salt, password_iterations FROM users WHERE username = ? LIMIT 1', [username]);
      const user = rows[0] || null;
      if (!user || !verifyPassword(password, user)) {
        return res.redirect('/login?message=' + encodeURIComponent('Invalid username or password.'));
      }

      const token = await createUserSession(pool, user.id);
      setSessionCookie(res, token);
      res.redirect('/admin');
    } catch (error) {
      next(error);
    }
  });

  app.get('/logout', async function (req, res, next) {
    try {
      const cookies = parseCookies(req.headers.cookie || '');
      const token = cookies[sessionCookieName];
      if (token) {
        await pool.query('DELETE FROM auth_sessions WHERE session_hash = ?', [hashSessionToken(token)]);
      }
      clearSessionCookie(res);
      res.redirect('/login?message=' + encodeURIComponent('You have been signed out.'));
    } catch (error) {
      next(error);
    }
  });
};