// Namensbasierte Sperrliste, persistent in data/bans.json.
// Ein gebannter Name kann keinen Score mehr eintragen (siehe /api/score) und seine
// bestehenden Eintraege werden beim Bannen entfernt. Vergleich case-insensitiv.

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 BANS_FILE = join(DATA_DIR, 'bans.json');

const norm = (name) => String(name || '').trim().toLowerCase();

export function readBans() {
  try {
    if (!existsSync(BANS_FILE)) return [];
    const data = JSON.parse(readFileSync(BANS_FILE, 'utf8'));
    return Array.isArray(data) ? data : [];
  } catch {
    return [];
  }
}

function writeBans(list) {
  if (!existsSync(DATA_DIR)) mkdirSync(DATA_DIR, { recursive: true });
  writeFileSync(BANS_FILE, JSON.stringify(list, null, 2));
}

export function isBanned(name) {
  return readBans().includes(norm(name));
}

export function banPlayer(name) {
  const n = norm(name);
  if (!n) return false;
  const bans = readBans();
  if (bans.includes(n)) return false; // schon gebannt
  bans.push(n);
  writeBans(bans);
  return true;
}

export function unbanPlayer(name) {
  const n = norm(name);
  const bans = readBans();
  const kept = bans.filter((b) => b !== n);
  if (kept.length === bans.length) return false; // war nicht gebannt
  writeBans(kept);
  return true;
}