'use strict';
const fs = require('fs');
const mode = process.argv[2];       // 'jsonl' | 'json-full'
const target = process.argv[3];
const workerId = process.argv[4];
const count = Number(process.argv[5]) || 100;

function writeJsonlRecord() {
  for (let i = 0; i < count; i++) {
    const rec = JSON.stringify({ worker: workerId, i, ts: Date.now() }) + '\n';
    fs.appendFileSync(target, rec);
  }
}

function writeJsonFullRewrite() {
  for (let i = 0; i < count; i++) {
    let arr = [];
    try { arr = JSON.parse(fs.readFileSync(target, 'utf8') || '[]'); } catch { arr = []; }
    arr.push({ worker: workerId, i, ts: Date.now() });
    fs.writeFileSync(target, JSON.stringify(arr), 'utf8');
  }
}

if (mode === 'jsonl') writeJsonlRecord();
else writeJsonFullRewrite();