#!/usr/bin/env node
/**
 * patch-r3-fallback-session-id.js · 2026-04-26
 * 修复 project-context-injector.js 的 unknown-session 跨会话污染:
 * 无 session_id 时直接 exit, 不落缓存
 * Idempotent: sentinel 'R3-FALLBACK-V2'
 */
'use strict';
const fs = require('fs');
const path = require('path');

const HOOK = path.join(process.env.HOME || process.env.USERPROFILE || 'C:/Users/leesu', '.claude', 'hooks', 'project-context-injector.js');
const SENTINEL = 'R3-FALLBACK-V2';
const OLD = "    const sessionId = hookData.session_id || 'unknown-session';\n    const cacheKey = sessionId + '::' + cwd;";
const NEW = "    // R3-FALLBACK-V2: 无 session_id 直接放弃, 防 'unknown-session' 跨会话缓存污染\n    if (!hookData.session_id) process.exit(0);\n    const sessionId = hookData.session_id;\n    const cacheKey = sessionId + '::' + cwd;";

try {
  let raw = fs.readFileSync(HOOK, 'utf8');
  if (raw.includes(SENTINEL)) {
    console.log('[r3-fallback] already applied, skip');
    process.exit(0);
  }
  if (!raw.includes(OLD)) {
    console.error('[r3-fallback] anchor not found, abort');
    process.exit(1);
  }
  fs.writeFileSync(HOOK + '.bak.r3fallback.' + Date.now(), raw, 'utf8');
  raw = raw.replace(OLD, NEW);
  fs.writeFileSync(HOOK, raw, 'utf8');
  console.log('[r3-fallback] applied');
} catch (e) {
  console.error('[r3-fallback] error:', e.message);
  process.exit(1);
}