/**
 * One-off: set Session.joinCode for all existing sessions (same algorithm as dashboard eventBuzzCode).
 * Run: cd backend && node scripts/backfill-session-join-codes.js
 */
const path = require('path');

require('dotenv').config({ path: path.join(__dirname, '..', '.env') });
const mongoose = require('mongoose');
const Session = require(path.join(__dirname, '..', 'src', 'models', 'Session'));
const { eventBuzzCodeFor } = require(path.join(__dirname, '..', 'src', 'utils', 'eventBuzzCode'));

async function run() {
  const uri = process.env.MONGODB_URI;
  if (!uri) {
    console.error('MONGODB_URI is not set');
    process.exit(1);
  }
  await mongoose.connect(uri);
  const sessions = await Session.find({}).select('_id').lean();
  let n = 0;
  for (const s of sessions) {
    const jc = eventBuzzCodeFor(s._id.toString(), 'session');
    await Session.updateOne({ _id: s._id }, { $set: { joinCode: jc } });
    n += 1;
  }
  console.log(`Backfilled joinCode for ${n} session(s).`);
  await mongoose.disconnect();
}

run().catch((err) => {
  console.error(err);
  process.exit(1);
});