#!/usr/bin/env node
/**
 * patch-x13-handoff-atomic-write.js
 * pre-compact-handoff.js 第40行 handoff.json writeFileSync → tmp+rename 原子写
 *
 * 幂等: SENTINEL 标记
 */
'use strict';
const fs = require('fs');
const path = require('path');

const SENTINEL = '[PATCH-X13-HANDOFF-ATOMIC]';
const TARGET = path.join(__dirname, '..', '..', 'hooks', 'pre-compact-handoff.js');

if (!fs.existsSync(TARGET)) { console.log('SKIP: target not found'); process.exit(0); }

let src = fs.readFileSync(TARGET, 'utf8').replace(/\r\n/g, '\n');
if (src.includes(SENTINEL)) { console.log('SKIP: already patched'); process.exit(0); }

const old = "    fs.writeFileSync(HANDOFF_PATH, JSON.stringify(handoff, null, 2), 'utf8');";
const replacement = [
  "    const _tmpHandoff = HANDOFF_PATH + '.tmp.' + process.pid; // " + SENTINEL,
  "    fs.writeFileSync(_tmpHandoff, JSON.stringify(handoff, null, 2), 'utf8');",
  "    fs.renameSync(_tmpHandoff, HANDOFF_PATH);"
].join('\n');

if (!src.includes(old)) {
  console.error('FAIL: old handoff writeFileSync not found');
  process.exit(1);
}

src = src.replace(old, replacement);

const tmp = TARGET + '.tmp.' + process.pid;
fs.writeFileSync(tmp, src, 'utf8');
fs.renameSync(tmp, TARGET);

console.log('OK: X13 handoff.json atomic write patched');