#!/usr/bin/env node
/**
 * PreToolUse Hook: NDA 读取防护 (standalone — 零外部 require)
 * 匹配器: Read|Glob|Grep
 * 退出码: 0=放行, 2=阻断(deny)
 *
 * 此文件内联了所有依赖，terser 混淆后无 require 链性能损失。
 * 源码维护版: nda-read-guard.js (含 checkInput 导出供测试)
 * 构建时由 build-portable.js 用此文件替换 nda-read-guard.js
 */
'use strict';

const fs = require('fs');
const path = require('path');

// --- 内联: root.js ---
const CLAUDE_ROOT = (() => {
  if (process.env.CLAUDE_HOME) return process.env.CLAUDE_HOME;
  const selfDir = path.dirname(__filename);
  if (selfDir.includes('.claude')) return selfDir.replace(/[\/\\]hooks$/, '');
  return path.join(process.env.USERPROFILE || process.env.HOME || '', '.claude');
})();

// --- 内联: logSecurityEvent (精简版, fail-open) ---
function logSecurityEvent(decision, reason, detail) {
  try {
    const dd = path.join(CLAUDE_ROOT, 'debug');
    if (!fs.existsSync(dd)) fs.mkdirSync(dd, { recursive: true });
    const lf = path.join(dd, 'security-' + new Date().toISOString().slice(0, 10) + '.jsonl');
    fs.appendFileSync(lf, JSON.stringify({
      ts: new Date().toISOString(),
      decision,
      hook: 'nda-read-guard',
      reason,
      detail: (detail || '').slice(0, 200).replace(/[A-Za-z0-9+/]{32,}/g, '[REDACTED]'),
    }) + '\n');
  } catch {}
}

// --- 路径规范化 ---
function norm(fp) {
  if (!fp) return '';
  fp = fp.trim();
  let r = path.resolve(fp);
  try { r = fs.realpathSync(r); } catch {}
  return r.replace(/\\/g, '/').replace(/\.+$/, '').replace(/::?\$DATA$/i, '');
}

// --- 白名单 ---
const WL = [
  /[\/]\.claude[\/]projects([\/]|$)/i,
  /[\/]\.claude[\/]memory([\/]|$)/i,
];

// --- 黑名单 ---
const BL = [
  /[\/]\.claude[\/]CLAUDE\.md$/i,
  /[\/]\.claude[\/]settings\.json$/i,
  /[\/]\.claude[\/]settings\.local\.json$/i,
  /[\/]\.claude[\/]stats-compiled\.json$/i,
  /[\/]\.claude[\/]MEMORY\.md$/i,
  /[\/]\.claude[\/]skills[\/]/i,
  /[\/]\.claude[\/]agents[\/]/i,
  /[\/]\.claude[\/]hooks[\/]/i,
  /[\/]\.claude[\/]scripts[\/]/i,
  /[\/]\.claude[\/]rules[\/]/i,
  /[\/]\.claude[\/]constitution[\/]/i,
  /[\/]\.claude[\/]docs[\/]/i,
  /[\/]\.claude[\/]debug[\/]/i,
  /[\/]\.claude[\/]templates[\/]/i,
];

// --- Glob 模式黑名单 ---
const GL = [
  /\.claude/i, /skills[\/\\]/i, /agents[\/\\]/i, /hooks[\/\\]/i,
  /CLAUDE\.md/i, /settings\.json/i, /SKILL\.md/i,
];

const DENY_MSG = '[系统] 该路径属于系统内部区域，无法访问。请直接描述您需要完成的任务，我来帮您。';

function chkPath(np) {
  if (!np) return null;
  for (const w of WL) { if (w.test(np)) return null; }
  for (const b of BL) { if (b.test(np)) return 1; }
  if (/[\/]\.claude[\/]/.test(np)) return 1;
  return null;
}

function chkGlob(p) {
  if (!p) return null;
  for (const g of GL) { if (g.test(p)) return 1; }
  return null;
}

// --- 内联: readStdin ---
function main() {
  let raw = '';
  process.stdin.setEncoding('utf8');
  process.stdin.on('data', c => {
    raw += c;
    if (raw.length > 512 * 1024) { process.exit(0); }
  });
  process.stdin.on('end', () => {
    try {
      const input = JSON.parse(raw);
      const tn = (input.tool_name || '').toLowerCase();
      const ti = input.tool_input || {};
      let hit = null;
      let target = '';

      if (tn === 'read') {
        target = ti.file_path || ti.filePath || '';
        hit = chkPath(norm(target));
      } else if (tn === 'glob') {
        target = ti.path || '';
        hit = chkPath(norm(target)) || chkGlob(ti.pattern || '');
        if (!target && hit) target = ti.pattern;
      } else if (tn === 'grep') {
        target = ti.path || '';
        hit = chkPath(norm(target));
      }

      if (hit) {
        logSecurityEvent('nda-deny', 'blocked', target);
        process.stderr.write(JSON.stringify({
          hookSpecificOutput: { permissionDecision: 'deny' },
          systemMessage: DENY_MSG,
        }));
        process.exit(2);
        return;
      }
    } catch {}
    process.exit(0);
  });
}

main();