#!/usr/bin/env node
/**
 * Stop Hook: 端到端审计 + 反馈闭环 (v5.2 Neural Gateway)
 *
 * 会话结束时:
 *   1. 读取 route-state-current.json
 *   2. 读取当天 compliance 日志
 *   3. 判定合规状态 (compliant / violated / skipped)
 *   4. 写入审计记录
 *   5. 累计违规 ≥ 5/天 → 触发 autoLearn
 *   6. 清理 route-state-current.json
 *
 * stdin: { session_id, transcript_path, hook_event_name: "Stop" }
 * 退出码: 始终 0
 */

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

const readStdin = require('./lib/read-stdin.js');


const CLAUDE_ROOT = require('./lib/root.js');
const DEBUG_DIR = path.join(CLAUDE_ROOT, 'debug');
const SCRIPTS_DIR = path.join(CLAUDE_ROOT, 'scripts');
const STATE_FILE = path.join(DEBUG_DIR, 'route-state-current.json');

/**
 * 加载路由状态
 */
function loadRouteState() {
  try {
    if (!fs.existsSync(STATE_FILE)) return null;
    return JSON.parse(fs.readFileSync(STATE_FILE, 'utf8'));
  } catch {
    return null;
  }
}

/**
 * 读取当天 compliance 日志
 * @returns {Object[]}
 */
function loadTodayCompliance() {
  const dateStr = new Date().toISOString().slice(0, 10);
  const logFile = path.join(DEBUG_DIR, `compliance-${dateStr}.jsonl`);
  try {
    if (!fs.existsSync(logFile)) return [];
    const lines = fs.readFileSync(logFile, 'utf8').trim().split('\n');
    return lines.map(l => { try { return JSON.parse(l); } catch { return null; } }).filter(Boolean);
  } catch {
    return [];
  }
}

/**
 * 查找当前 traceId 的 compliance 条目
 */
function findTraceEntries(entries, traceId) {
  return entries.filter(e => e.traceId === traceId);
}

/**
 * 查找当天 activity 日志中的 Skill 调用
 */
function findSkillUsage() {
  const dateStr = new Date().toISOString().slice(0, 10);
  const activityFile = path.join(DEBUG_DIR, `activity-${dateStr}.jsonl`);
  try {
    if (!fs.existsSync(activityFile)) return [];
    const lines = fs.readFileSync(activityFile, 'utf8').trim().split('\n');
    return lines
      .map(l => { try { return JSON.parse(l); } catch { return null; } })
      .filter(e => e && e.event === 'skill');
  } catch {
    return [];
  }
}

/**
 * 判定合规状态
 * 数据源优先级: gate-pass 事件 > activity 日志 skill 事件
 */
function judgeCompliance(state, traceEntries, skillUsages) {
  // 检查是否有 gate-block 事件
  const gateBlocked = traceEntries.some(e => e.event === 'gate-block');

  // 优先从 gate-pass 事件获取 actualSkill (合规门控已记录)
  const gatePassed = traceEntries.filter(e => e.event === 'gate-pass');
  let actualSkill = null;

  if (gatePassed.length > 0) {
    // 取最后一个 gate-pass 的 skill
    actualSkill = gatePassed[gatePassed.length - 1].skill;
  }

  // T01: 从 route-state-current.json 的 actualSkill 字段读取 (compliance-gate 写入)
  if (!actualSkill && state.actualSkill) {
    actualSkill = state.actualSkill;
  }

  // H1 修复: 读 jsonl 按 traceId 过滤最后一条匹配 (防 lastWriter-wins 污染)
  if (!actualSkill) {
    try {
      const actualJsonl = path.join(DEBUG_DIR, 'actual-skills.jsonl');
      if (fs.existsSync(actualJsonl)) {
        const lines = fs.readFileSync(actualJsonl, 'utf8').split(/\r?\n/).filter(Boolean);
        // 倒序扫描取最后匹配行 (保证取到该 traceId 最近一次 Skill 调用)
        for (let i = lines.length - 1; i >= 0; i--) {
          try {
            const e = JSON.parse(lines[i]);
            if (e.traceId === state.traceId && e.actualSkill) {
              actualSkill = e.actualSkill;
              break;
            }
          } catch {}
        }
      }
      // 回退: 旧单文件 actual-skill.json (W2: 默认跳过，由 flag 恢复)
      if (!actualSkill && process.env.BOOKWORM_LEGACY_ACTUAL_SKILL === '1') {
        const actualFile = path.join(DEBUG_DIR, 'actual-skill.json');
        if (fs.existsSync(actualFile)) {
          const actualData = JSON.parse(fs.readFileSync(actualFile, 'utf8'));
          if (actualData.traceId === state.traceId && actualData.actualSkill) {
            actualSkill = actualData.actualSkill;
          }
        }
      }
    } catch {}
  }

  // 回退: 从 activity 日志查找 Skill 调用
  if (!actualSkill) {
    const stateTs = new Date(state.ts).getTime();
    if (!isNaN(stateTs)) {
      const recentSkills = skillUsages.filter(s => {
        const skillTs = new Date(s.ts).getTime();
        if (isNaN(skillTs)) return false;
        return skillTs >= stateTs && skillTs - stateTs < 5 * 60 * 1000;
      });
      if (recentSkills.length > 0) {
        actualSkill = recentSkills[recentSkills.length - 1].detail;
      }
    }
  }

  if (!actualSkill) {
    // P2: 对 medium/complex 路由推断隐式接受 (提升 H9 数据密度)
    const complexity = state.intent?.complexity;
    if ((complexity === 'medium' || complexity === 'complex') && state.routing?.primary) {
      return { compliant: 'inferred', actualSkill: state.routing.primary, gateBlocked };
    }
    // 简单查询无 Skill 调用 → 跳过
    return { compliant: 'skipped', actualSkill: null, gateBlocked };
  }

  // 检查是否匹配路由推荐
  const primary = state.routing?.primary;
  const candidateNames = (state.routing?.candidates || []).map(c => c.name);
  const chainSkills = state.routing?.chain || [];
  const allAllowed = new Set([primary, ...candidateNames, ...chainSkills, 'developer-expert']);

  if (allAllowed.has(actualSkill)) {
    return { compliant: true, actualSkill, gateBlocked };
  }

  return { compliant: false, actualSkill, gateBlocked };
}

/**
 * 写入审计记录
 */
function writeAuditEntry(state, judgment) {
  const entry = {
    ts: new Date().toISOString(),
    traceId: state.traceId,
    promptHash: state.promptHash,
    intent: {
      complexity: state.intent?.complexity,
      intents: state.intent?.intents,
    },
    routedTo: state.routing?.primary,
    actualSkill: judgment.actualSkill,
    compliant: judgment.compliant,
    gateBlocked: judgment.gateBlocked,
    confidence: state.routing?.confidence,
  };

  try {
    if (!fs.existsSync(DEBUG_DIR)) fs.mkdirSync(DEBUG_DIR, { recursive: true });
    const dateStr = new Date().toISOString().slice(0, 10);
    const logFile = path.join(DEBUG_DIR, `compliance-${dateStr}.jsonl`);
    // C2_SAFE_APPEND_v1: 使用 safeAppendJsonl 文件锁防并发损坏
    try {
      const { safeAppendJsonl } = require('./lib/safe-append.js');
      safeAppendJsonl(logFile, entry, { useLock: true });
    } catch {
      try { fs.appendFileSync(logFile, JSON.stringify(entry) + '\n'); } catch {}
    }
  } catch {}

  return entry;
}

/**
 * 检查是否需要触发 autoLearn
 */
function checkAutoLearn(todayEntries) {
  const violations = todayEntries.filter(e =>
    e.compliant === false
  );

  if (violations.length >= 5) {
    try {
      const routeFeedback = require(path.join(SCRIPTS_DIR, 'route-feedback.js'));
      if (routeFeedback.autoLearn) {
        routeFeedback.autoLearn();
      }
    } catch {}
  }
}

/**
 * 运行隐式反馈推断 (会话结束时触发)
 */
function runImplicitFeedback() {
  try {
    const implicitFeedback = require(path.join(SCRIPTS_DIR, 'implicit-feedback.js'));
    if (implicitFeedback.inferAndWrite) {
      implicitFeedback.inferAndWrite({ days: 1 });
    }
  } catch {
    // 模块不存在或异常时静默跳过
  }
}

/**
 * 清理路由状态文件
 */
/**
 * 回写 actualSkill 到当日路由日志
 */
function updateRouteLogWithActual(traceId, actualSkill) {
  try {
    const dateStr = new Date().toISOString().slice(0, 10);
    const logFile = path.join(DEBUG_DIR, "route-" + dateStr + ".jsonl");
    if (!fs.existsSync(logFile)) return;
    // H11: O_EXCL 文件锁保护全文件 read-modify-write
    // P2.2 stale lock: mtime>60s 视为进程崩溃残留，强制释放后重试
    const lockFile = logFile + '.lock';
    let lockFd;
    try { lockFd = fs.openSync(lockFile, 'wx'); } catch {
      try {
        const lockStat = fs.statSync(lockFile);
        if (Date.now() - lockStat.mtimeMs > 60000) {
          try { fs.unlinkSync(lockFile); } catch {}
          try { lockFd = fs.openSync(lockFile, 'wx'); } catch { return; }
        } else { return; }
      } catch { return; }
    }
    try {
      const lines = fs.readFileSync(logFile, "utf8").trim().split("\n");
      let updated = false;
      const newLines = lines.map(line => {
        try {
          const entry = JSON.parse(line);
          if (entry.traceId === traceId && !entry.actualSkill) {
            entry.actualSkill = actualSkill;
            updated = true;
            return JSON.stringify(entry);
          }
        } catch {}
        return line;
      });
      if (updated) {
        const tmpFile = logFile + '.tmp.' + process.pid;
        fs.writeFileSync(tmpFile, newLines.join("\n") + "\n");
        fs.renameSync(tmpFile, logFile);
      }
    } finally {
      try { fs.closeSync(lockFd); fs.unlinkSync(lockFile); } catch {}
    }
  } catch {}
}

function cleanupState() {
  try {
    if (fs.existsSync(STATE_FILE)) {
      fs.unlinkSync(STATE_FILE);
    }
  } catch {}
}

// === 主流程 ===
function main() {
  readStdin({ maxSize: 128 * 1024 }).then(input => {
    // 读取路由状态
    const state = loadRouteState();

    if (!state) {
      // 无路由记录 → 不审计
      process.exit(0);
      return;
    }

    // 读取 compliance 日志
    const todayEntries = loadTodayCompliance();
    const traceEntries = findTraceEntries(todayEntries, state.traceId);

    // 查找 Skill 使用记录
    const skillUsages = findSkillUsage();

    // 判定合规
    const judgment = judgeCompliance(state, traceEntries, skillUsages);

    // 写入审计记录
    writeAuditEntry(state, judgment);



    // [v6.1-PATCH] adaptive-disambiguator feedback
    // 反馈闭环: 检测到路由纠正时，更新 Bayesian Dirichlet 先验
    // compliant===false 表示用户实际使用的技能与路由推荐不符
    if (judgment.compliant === false && judgment.actualSkill && state.routing) {
      try {
        const adaptiveDisamb = require(require('path').join(
          __dirname.replace(/[/\\]hooks$/, ''), 'scripts', 'adaptive-disambiguator.js'
        ));
        const routedTo = state.routing.primary;
        const actualSkill = judgment.actualSkill;
        // 竞争技能: 路由时的候选列表（排除 routedTo 和 actualSkill 本身）
        const competingSkills = (state.routing.candidates || [])
          .map(c => c.name)
          .filter(n => n !== routedTo && n !== actualSkill);
        adaptiveDisamb.updateFromFeedback(routedTo, actualSkill, competingSkills);
      } catch {}
    }

    // 回写 actualSkill 到当日路由日志 (供 implicit-feedback 消费)
    if (judgment.actualSkill && state.traceId) {
      updateRouteLogWithActual(state.traceId, judgment.actualSkill);
    }

    // A/B 实验结果回写 (v5.5 闭环)
    if (state.routing && state.routing.experiment && state.routing.experiment.id) {
      try {
        const abTest = require(path.join(SCRIPTS_DIR, "route-ab-test.js"));
        const expId = state.routing.experiment.id;
        const usedSkill = judgment.actualSkill || state.routing.primary;
        // 无纠正 = success，合规跳过也算 success (用户接受了路由)
        const outcome = (judgment.compliant === false) ? "failure" : "success";
        abTest.recordOutcome(expId, usedSkill, outcome);
        // 检查是否收敛
        abTest.resolveConverged();
      } catch {}
    }

    // v6.4: abVariant 闭环 — 当 route-state 含 abVariant 时补充调用 recordOutcome
    // 确保 selectVariant() 的 Thompson Sampling Beta 分布获得反馈更新
    if (state.abVariant && state.abVariant.experimentId) {
      try {
        const abTest = require(path.join(SCRIPTS_DIR, "route-ab-test.js"));
        const expId = state.abVariant.experimentId;
        // 以实际使用的 skill 作为 outcome 目标；回退到路由推荐的 primary
        const usedSkill = judgment.actualSkill || (state.routing && state.routing.primary) || state.abVariant.selected;
        // 判定: 用户未纠正路由 = success，纠正了 = failure
        const outcome = (judgment.compliant === false) ? "failure" : "success";
        abTest.recordOutcome(expId, usedSkill, outcome);
        abTest.resolveConverged();
      } catch {
        // fail-open: recordOutcome 失败不影响审计流程
      }
    }

    // 累计检查
    const allTodayEntries = loadTodayCompliance(); // 重新加载 (含刚写入的)
    checkAutoLearn(allTodayEntries);

    // 运行隐式反馈推断
    runImplicitFeedback();

    // 清理 route-state
    cleanupState();
    process.exit(0);
  }).catch(() => process.exit(0));
}

/**
 * 可导出的审计执行函数 (供 dispatcher 调用)
 * 不读取 stdin，不调用 process.exit
 */
function runAudit() {
  try {
    const state = loadRouteState();
    if (!state) return;

    const todayEntries = loadTodayCompliance();
    const traceEntries = findTraceEntries(todayEntries, state.traceId);
    const skillUsages = findSkillUsage();
    const judgment = judgeCompliance(state, traceEntries, skillUsages);

    writeAuditEntry(state, judgment);

    // adaptive-disambiguator feedback
    if (judgment.compliant === false && judgment.actualSkill && state.routing) {
      try {
        const adaptiveDisamb = require(path.join(
          __dirname.replace(/[/\\]hooks$/, ''), 'scripts', 'adaptive-disambiguator.js'
        ));
        const routedTo = state.routing.primary;
        const actualSkill = judgment.actualSkill;
        const competingSkills = (state.routing.candidates || [])
          .map(c => c.name)
          .filter(n => n !== routedTo && n !== actualSkill);
        adaptiveDisamb.updateFromFeedback(routedTo, actualSkill, competingSkills);
      } catch {}
    }

    if (judgment.actualSkill && state.traceId) {
      updateRouteLogWithActual(state.traceId, judgment.actualSkill);
    }

    // A/B 实验结果回写
    if (state.routing && state.routing.experiment && state.routing.experiment.id) {
      try {
        const abTest = require(path.join(SCRIPTS_DIR, 'route-ab-test.js'));
        const expId = state.routing.experiment.id;
        const usedSkill = judgment.actualSkill || state.routing.primary;
        const outcome = (judgment.compliant === false) ? 'failure' : 'success';
        abTest.recordOutcome(expId, usedSkill, outcome);
        abTest.resolveConverged();
      } catch {}
    }

    // v6.4: abVariant 闭环 — 当 route-state 含 abVariant 时补充调用 recordOutcome
    // 确保 selectVariant() 的 Thompson Sampling Beta 分布获得反馈更新
    if (state.abVariant && state.abVariant.experimentId) {
      try {
        const abTest = require(path.join(SCRIPTS_DIR, 'route-ab-test.js'));
        const expId = state.abVariant.experimentId;
        const usedSkill = judgment.actualSkill || (state.routing && state.routing.primary) || state.abVariant.selected;
        const outcome = (judgment.compliant === false) ? 'failure' : 'success';
        abTest.recordOutcome(expId, usedSkill, outcome);
        abTest.resolveConverged();
      } catch {
        // fail-open: recordOutcome 失败不影响审计流程
      }
    }

    const allTodayEntries = loadTodayCompliance();
    checkAutoLearn(allTodayEntries);
    // GH-4: runImplicitFeedback() 已由 stop-dispatcher 独立调用，此处移除避免双重执行
    cleanupState();
  } catch {}
}

// 模块导出 (供测试和 dispatcher 使用)
if (typeof module !== 'undefined') {
  module.exports = {
    detectClaudeRoot: CLAUDE_ROOT,
    loadRouteState,
    loadTodayCompliance,
    findTraceEntries,
    findSkillUsage,
    judgeCompliance,
    writeAuditEntry,
    checkAutoLearn,
    cleanupState,
    runAudit,
  };
}

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