import { appendFile, mkdir } from 'node:fs/promises';
import path from 'node:path';

const ALLOWED = new Set(['event', 'state', 'code', 'lane', 'jobId', 'durationMs', 'success', 'reason']);

export class PrivacyLog {
  constructor({ file = path.join(process.env.XDG_STATE_HOME || path.join(process.env.HOME || '/tmp', '.local/state'), 'jarvis/events.jsonl') } = {}) {
    this.file = file;
  }

  async record(event, fields = {}) {
    const safe = { ts: new Date().toISOString(), event };
    for (const [key, value] of Object.entries(fields)) {
      if (ALLOWED.has(key) && (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean')) safe[key] = value;
    }
    await mkdir(path.dirname(this.file), { recursive: true });
    await appendFile(this.file, `${JSON.stringify(safe)}\n`, 'utf8');
    return safe;
  }
}

export { ALLOWED };