// Betriebsmodus des Spiels, per CLI umschaltbar, persistent in data/mode.json.
//   public  -> "/" ist das Spiel (Default)
//   private -> "/" zeigt "nicht erlaubt", Spiel nur unter "/<path>" erreichbar (zum Testen)
// Wird pro Request frisch gelesen -> CLI-Umschaltung wirkt SOFORT, ohne Serverneustart.

import { existsSync, readFileSync, writeFileSync, mkdirSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const DATA_DIR = join(__dirname, '..', 'data');
const MODE_FILE = join(DATA_DIR, 'mode.json');

const DEFAULT = { mode: 'public', path: 'play' };

function sanitizeSlug(slug) {
  const s = String(slug || '').trim().replace(/^\/+/, '').replace(/[^a-zA-Z0-9_-]/g, '');
  return s || 'play';
}

export function getMode() {
  try {
    if (!existsSync(MODE_FILE)) return { ...DEFAULT };
    const data = JSON.parse(readFileSync(MODE_FILE, 'utf8'));
    return {
      mode: data.mode === 'private' ? 'private' : 'public',
      path: sanitizeSlug(data.path),
    };
  } catch {
    return { ...DEFAULT };
  }
}

export function setMode(mode, path) {
  if (!existsSync(DATA_DIR)) mkdirSync(DATA_DIR, { recursive: true });
  const current = getMode();
  const next = {
    mode: mode === 'private' ? 'private' : 'public',
    path: sanitizeSlug(path || current.path),
  };
  writeFileSync(MODE_FILE, JSON.stringify(next, null, 2));
  return next;
}