#!/usr/bin/env node
/**
 * PostToolUse Hook: 统一编辑派遣器 (v5.2 性能优化)
 * 匹配器: Edit|Write|NotebookEdit
 *
 * 合并 5 个 PostToolUse 钩子为单进程，核心优化:
 *   1. 单次 stdin 读取 (避免 5× JSON 解析开销)
 *   2. check-typescript + check-lint 并行执行 (省 ~10s)
 *   3. 轻量级检查 (suggest-tests/drift-detector/integrity-check) 同步内联
 *
 * 退出码: 0=通过, 2=有反馈(continue=true)
 * 容错: 任何子检查异常不影响其他检查，fail-open
 */

const { spawn } = require('child_process');
const path = require('path');
const fs = require('fs');
const crypto = require('crypto');

const { isEnabled } = require('../scripts/feature-flags.js');

const MAX_STDIN_SIZE = 1024 * 1024;
const HOOKS_DIR = __dirname;

// === 共享常量 ===
const TS_EXTENSIONS = ['.ts', '.tsx', '.mts', '.cts'];
const LINT_EXTENSIONS = ['.js', '.jsx', '.ts', '.tsx', '.vue'];
const SOURCE_EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx', '.py', '.go', '.rs'];

// === 主入口 ===
function main() {
  let rawInput = '';
  process.stdin.setEncoding('utf8');
  process.stdin.on('data', (chunk) => {
    rawInput += chunk;
    if (rawInput.length > MAX_STDIN_SIZE) { process.exit(0); }
  });
  process.stdin.on('end', async () => {
    try {
      const input = JSON.parse(rawInput);
      // [v6.1-PATCH] hook-priority-scheduler
      // 初始化优先级调度器，高工具调用次数时自动跳过低优先级钩子
      let _toolCallCount = 0;
      let _scheduler = null;
      try {
        _scheduler = require(require('path').join(
          __dirname.replace(/[/\\]hooks$/, ''), 'scripts', 'hook-priority-scheduler.js'
        ));
        _toolCallCount = _scheduler.readToolCallCount();
      } catch {}

      const filePath = (input.tool_input &&
        (input.tool_input.file_path || input.tool_input.filePath || input.tool_input.notebook_path)) || '';

      if (!filePath) { process.exit(0); return; }

      // [OPT-1] 临时文件路径跳过：Desktop/ 下的修复脚本/验证脚本不需要质量检查
      if (filePath.includes('Desktop') || filePath.includes('desktop')) { process.exit(0); return; }

      const ext = path.extname(filePath).toLowerCase();
      const messages = [];
      const dispatchStartMs = Date.now(); // [P3-6] 计时起点

      // 并行分组:
      // 组 A (重型, 并行): check-typescript + check-lint
      // 组 B (轻型, 同步): suggest-tests + drift-detector + integrity-check
      const heavyChecks = [];

      // --- 重型检查: TypeScript 编译 ---
      if (TS_EXTENSIONS.includes(ext)) {
        // [v6.1-PATCH] hook-priority-scheduler: check-typescript 为 medium 优先级
        if (!_scheduler || _scheduler.shouldExecute('check-typescript', _toolCallCount)) {
          heavyChecks.push(runSubHook('check-typescript.js', rawInput));
        }
      }

      // --- 重型检查: ESLint ---
      if (LINT_EXTENSIONS.includes(ext)) {
        // [v6.1-PATCH] hook-priority-scheduler: check-lint 为 medium 优先级
        if (!_scheduler || _scheduler.shouldExecute('check-lint', _toolCallCount)) {
          heavyChecks.push(runSubHook('check-lint.js', rawInput));
        }
      }

      // --- 轻型检查: 测试提醒 (委托 suggest-tests.js) ---
      const testMsg = checkSuggestTests(filePath, ext, input.tool_name);
      if (testMsg) messages.push(testMsg);

      // --- 轻型检查: 漂移检测 (委托 drift-detector.js) ---
      const driftMsg = checkDriftDetector(filePath);
      if (driftMsg) messages.push(driftMsg);

      // --- 轻型检查: 完整性校验 (内联) ---
      const integrityMsg = checkIntegrity(filePath);
      if (integrityMsg) messages.push(integrityMsg);

      // --- Phase 2.2: 大变更质量提醒 (轻型, <1ms) ---
      try {
        const content = (input.tool_input && (input.tool_input.content || input.tool_input.new_string)) || '';
        const isHookFile = filePath && /[/\\]hooks[/\\]/.test(filePath);
        if (content.length > 500 || isHookFile) {
          const lineCount = content.split(String.fromCharCode(10)).length;
          const isSourceCode = SOURCE_EXTENSIONS.includes(ext);
          let hint = '[quality-reminder] 较大变更 (' + content.length + ' chars' + (isHookFile ? ', hooks基础设施' : '') + ')，建议完成后运行构建验证。';
          if (isSourceCode && lineCount > 200) {
            hint += ' 大规模源码变更 (' + lineCount + ' 行)，建议运行 /review 进行代码审查。';
          }
          messages.push(hint);
        }
      } catch {}

      // --- #4 合并: 反模式检测 (原 post-edit-quality-check.js) ---
      // [v6.2-PATCH] feature-flag 检查: 仅在 post-edit-quality-check 启用时调用
      if (isEnabled('post-edit-quality-check')) {
        try {
          const qc = require('./post-edit-quality-check.js');
          if (qc && qc.detectAntiPatterns && qc.extractContent) {
            const qcContent = qc.extractContent(input);
            if (qcContent && /.(?:js|ts|jsx|tsx)$/.test(filePath)) {
              const findings = qc.detectAntiPatterns(qcContent);
              if (findings.length > 0) {
                const items = findings.map(f => '  [' + f.severity.toUpperCase() + '][' + f.id + '] L' + f.line + ': ' + f.label).join('\n');
                messages.push('[quality-check] ' + path.basename(filePath) + ':\n' + items);
                try { qc.updateDetectionStats(findings, filePath); } catch {}
              }
            }
          }
        } catch {}
      }

      // --- #4 合并: 宪法反腐败检测 (原 constitution-guard.js) ---
      // [v6.2-PATCH] feature-flag 检查: 仅在 constitution-guard 启用时调用
      if (isEnabled('constitution-guard')) {
        try {
          const cg = require('./constitution-guard.js');
          if (cg && cg.detectConstitutionViolations && cg.extractContent) {
            const cgContent = cg.extractContent(input);
            if (cgContent) {
              const violations = cg.detectConstitutionViolations(cgContent, filePath);
              if (violations.length > 0) {
                const items = violations.map(v => '  [' + v.severity.toUpperCase() + '][' + v.id + '] ' + (v.line ? 'L' + v.line + ': ' : '') + v.label).join('\n');
                messages.push('[constitution-guard] ' + path.basename(filePath) + ':\n' + items);
              }
            }
          }
        } catch {}
      }

      // 等待重型检查完成 (并行)
      if (heavyChecks.length > 0) {
        const results = await Promise.all(heavyChecks);
        for (const r of results) {
          if (r) messages.push(r);
        }
      }

      // 合并输出
      if (messages.length === 0) {
        process.exit(0);
        return;
      }

      // [P2-4] 输出截断: 防止大量 lint/ts 错误撑爆上下文
      const MAX_SYSTEM_MESSAGE_CHARS = 2000;
      let finalMessage = messages.join('\n\n');
      if (finalMessage.length > MAX_SYSTEM_MESSAGE_CHARS) {
        const origLen = finalMessage.length;
        finalMessage = finalMessage.slice(0, MAX_SYSTEM_MESSAGE_CHARS)
          + '\n\n[...截断: ' + origLen + ' chars, 详见 debug/hook-output.log]';
        try {
          const logPath = require('path').join(__dirname, '..', 'debug', 'hook-output.log');
          require('fs').appendFileSync(logPath, '[' + new Date().toISOString() + ']\n' + messages.join('\n') + '\n---\n');
        } catch {}
      }

      // [P3-6] 记录 post-edit 总耗时
      try {
        const elapsed = Date.now() - dispatchStartMs;
        const tPath = require('path').join(__dirname, '..', 'debug', 'hook-timing.jsonl');
        require('fs').appendFileSync(tPath, JSON.stringify({ ts: new Date().toISOString(), hook: 'post-edit-dispatcher', elapsed, msgCount: messages.length, msgChars: finalMessage.length }) + '\n');
      } catch {}

      process.stderr.write(JSON.stringify({
        continue: true,
        suppressOutput: false,
        systemMessage: finalMessage,
      }));
      process.exit(2);
    } catch (e) {
      // P2.3 错误日志化: 静默 fail-open 前先 append 到 hook-errors.log，保留可观测性
      try {
        const errLog = require('path').join(require('./lib/root.js'), 'debug', 'hook-errors.log');
        require('fs').appendFileSync(errLog, JSON.stringify({
          ts: new Date().toISOString(),
          hook: 'post-edit-dispatcher',
          level: 'FATAL',
          msg: (e && e.message) || String(e),
          stack: (e && e.stack) ? e.stack.slice(0, 500) : null,
        }) + '\n');
      } catch {}
      process.exit(0); // fail-open
    }
  });
}

// === 运行子钩子进程 (并行) ===
function runSubHook(hookFile, stdinData) {
  return new Promise((resolve) => {
    const hookPath = path.join(HOOKS_DIR, hookFile);
    if (!fs.existsSync(hookPath)) { resolve(null); return; }

    const child = spawn('node', [hookPath], {
      stdio: ['pipe', 'pipe', 'pipe'],
      timeout: 15000,
    });

    let stderr = '';
    child.stderr.on('data', (d) => { stderr += d; });
    child.stdout.on('data', () => {}); // 消耗 stdout 防阻塞

    child.on('close', (code) => {
      if (code === 2 && stderr) {
        try {
          const parsed = JSON.parse(stderr);
          resolve(parsed.systemMessage || null);
        } catch {
          resolve(null);
        }
      } else {
        resolve(null);
      }
    });

    child.on('error', () => resolve(null));

    // 将原始 stdin 传递给子进程
    child.stdin.write(stdinData);
    child.stdin.end();
  });
}

// === 委托: 测试提醒 (suggest-tests.js — 8 路径候选 + 16 跳过模式) ===
function checkSuggestTests(filePath, ext, toolName) {
  try {
    const st = require('./suggest-tests.js');
    if (st && st.inlineCheck) {
      return st.inlineCheck(filePath, ext, toolName);
    }
  } catch {}
  return null;
}

// === 委托: 漂移检测 (drift-detector.js — 含 generate-stats 自动触发 + 宪法变更检测) ===
function checkDriftDetector(filePath) {
  try {
    const dd = require('./drift-detector.js');
    if (dd && dd.inlineCheck) {
      return dd.inlineCheck(filePath);
    }
  } catch {}
  return null;
}

// === 内联: 完整性校验 (P1-4: 委托 integrity-check.js 含 HMAC 验证) ===
function checkIntegrity(filePath) {
  try {
    const integrityMod = require('./integrity-check.js');
    if (integrityMod && integrityMod.inlineCheck) {
      return integrityMod.inlineCheck(filePath);
    }
  } catch {}
  return null;
}

// 模块导出 (供测试使用)
if (typeof module !== 'undefined') {
  module.exports = { checkSuggestTests, checkDriftDetector, checkIntegrity, runSubHook };
}

if (require.main === module) {
  main();
}