/**
 * Hub audit log. Appends events to data_dir/hub_audit.log.
 */

import fs from 'fs';
import path from 'path';

/**
 * Append an audit entry. Creates data_dir if needed.
 * @param {string} dataDir - Path to data directory
 * @param {{
 *   userId: string,
 *   action: string,
 *   proposalId: string,
 *   detail?: Record<string, unknown>,
 * }} entry
 */
export function appendAudit(dataDir, entry) {
  const logPath = path.join(dataDir, 'hub_audit.log');
  const dir = path.dirname(logPath);
  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
  const line =
    JSON.stringify({
      ts: new Date().toISOString(),
      user_id: entry.userId,
      action: entry.action,
      proposal_id: entry.proposalId,
      ...(entry.detail && typeof entry.detail === 'object' ? { detail: entry.detail } : {}),
    }) + '\n';
  fs.appendFileSync(logPath, line, 'utf8');
}