/**
 * logger.js — persistent JSONL log to ~/.logs/token-monitor/YYYY-MM-DD.jsonl
 */

import { appendFileSync, mkdirSync } from 'fs';
import { homedir } from 'os';
import { join } from 'path';

export function logRun(data) {
  const dir = join(homedir(), '.logs', 'token-monitor');
  mkdirSync(dir, { recursive: true });
  const file = join(dir, `${new Date().toISOString().slice(0, 10)}.jsonl`);
  appendFileSync(file, JSON.stringify({ ts: new Date().toISOString(), ...data }) + '\n');
}

export function getLogPath() {
  const today = new Date().toISOString().slice(0, 10);
  return join(homedir(), '.logs', 'token-monitor', `${today}.jsonl`);
}