#!/usr/bin/env node
/**
 * patch-r4-claudemd-doc.js · 2026-04-26
 *
 * R4: CLAUDE.md §上下文管理 追加外部压力信号说明, 同时升级 60% 规则
 *
 * 幂等: sentinel "外部压力信号"
 */
'use strict';
const fs = require('fs');
const path = require('path');

const TARGET = path.join(__dirname, '..', '..', 'CLAUDE.md');
const SENTINEL = '外部压力信号';

const OLD = '- Compact at 60% context usage, do not wait until critical';
const NEW = '- Compact at 60% context usage, do not wait until critical (R4 **外部压力信号** 已自动播报: INFO 50% / WARN 70% / CRITICAL 85%, 收到信号时按建议动作执行, 不再凭自我感觉判断)';

function main() {
  const src = fs.readFileSync(TARGET, 'utf8');
  if (src.includes(SENTINEL)) {
    console.log('[r4-doc] already applied, skip');
    return;
  }
  if (!src.includes(OLD)) {
    console.error('[r4-doc] anchor not found, manual review needed');
    process.exit(1);
  }
  const next = src.replace(OLD, NEW);
  const bak = TARGET + '.bak.r4doc.' + Date.now();
  fs.copyFileSync(TARGET, bak);
  const tmp = TARGET + '.tmp.' + process.pid;
  fs.writeFileSync(tmp, next, 'utf8');
  fs.renameSync(tmp, TARGET);
  console.log('[r4-doc] OK, bak:', path.basename(bak));
}

main();