#!/usr/bin/env node
// patch-x03-heartbeat-session-isolation.js
// P1: session-heartbeat.js 状态无 session_id 隔离, 多窗口互相干扰
// 修复: 改为 { [session_id]: {count,lastActivity,notified} } keyed 结构
// 连带: pre-compact-handoff.js heartbeat 重置改为只重置自身 session
'use strict';
const fs = require('fs');
const path = require('path');

const SENTINEL = '// [PATCH-X03-SESSION-ISOLATION]';
const heartbeatFile = path.join(__dirname, '..', '..', 'hooks', 'session-heartbeat.js');
const handoffFile = path.join(__dirname, '..', '..', 'hooks', 'pre-compact-handoff.js');

// ======================== Part 1: session-heartbeat.js ========================
if (!fs.existsSync(heartbeatFile)) {
  process.stdout.write('[SKIP] session-heartbeat.js not found\n');
  process.exit(0);
}

let hbContent = fs.readFileSync(heartbeatFile, 'utf8');
if (hbContent.includes(SENTINEL)) {
  process.stdout.write('[SKIP] patch-x03 already applied to heartbeat\n');
} else {
  const hbBak = heartbeatFile + '.bak.x03';
  if (!fs.existsSync(hbBak)) fs.writeFileSync(hbBak, hbContent);

  const NEW_HEARTBEAT = `#!/usr/bin/env node
${SENTINEL}
/**
 * PostToolUse Hook: 会话心跳检测器 (session-isolated)
 * Matcher: Edit|Write|Skill|Agent|Bash|mcp__.*
 *
 * 按 session_id 隔离计数, 多窗口不互相干扰.
 * 阈值策略同原版: 20(INFO) / 30(WARNING) / 40(CRITICAL) / 50+ 每10次强提醒
 * 退出码: 始终 0 (纯通知, 不阻断工作流)
 */
'use strict';

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

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

const STATE_FILE = path.join(CLAUDE_ROOT, 'debug', 'session-heartbeat.json');
const SESSION_TIMEOUT_MS = 30 * 60 * 1000;

const THRESHOLDS = [
  { count: 20, level: 'INFO',     msg: '当前会话已执行 {n} 次工具调用。如对话较长，可考虑 /clear 释放上下文。' },
  { count: 30, level: 'WARNING',  msg: '当前会话已执行 {n} 次工具调用，上下文可能接近饱和。建议在合适时机 /clear 重置上下文窗口。' },
  { count: 40, level: 'CRITICAL', msg: '当前会话已执行 {n} 次工具调用，上下文压力较大。强烈建议用户 /clear 重置。如有重要任务进行中，可委托 Agent 子进程隔离执行。' },
];

(async () => {
  try {
    let hookData = {};
    try { hookData = await readStdin(); } catch {}

    const sid = hookData.session_id || 'default';
    const debugDir = path.join(CLAUDE_ROOT, 'debug');
    if (!fs.existsSync(debugDir)) fs.mkdirSync(debugDir, { recursive: true });

    let allState = {};
    try {
      if (fs.existsSync(STATE_FILE)) {
        allState = JSON.parse(fs.readFileSync(STATE_FILE, 'utf8'));
      }
    } catch { allState = {}; }

    // 清理 2 小时无活动的其他会话 (防文件膨胀)
    const now = Date.now();
    const GC_MS = 2 * 3600 * 1000;
    for (const k of Object.keys(allState)) {
      if (k !== sid && now - (allState[k]?.lastActivity || 0) > GC_MS) delete allState[k];
    }

    let state = allState[sid] || { count: 0, lastActivity: now, notified: [] };

    // 会话超时: 30 分钟无活动 → 重置该会话
    if (now - (state.lastActivity || 0) > SESSION_TIMEOUT_MS) {
      state = { count: 0, lastActivity: now, notified: [] };
    }

    state.count += 1;
    state.lastActivity = now;

    let notification = null;

    for (const t of THRESHOLDS) {
      if (state.count === t.count && !state.notified.includes(t.count)) {
        notification = { level: t.level, msg: t.msg.replace('{n}', state.count) };
        state.notified.push(t.count);
        break;
      }
    }

    if (!notification && state.count >= 50 && state.count % 10 === 0 && !state.notified.includes(state.count)) {
      notification = {
        level: 'CRITICAL',
        msg: \`当前会话已执行 \${state.count} 次工具调用，上下文严重饱和。请立即建议用户 /clear 或将剩余任务委托给 Agent 子进程。\`
      };
      state.notified.push(state.count);
    }

    allState[sid] = state;
    fs.writeFileSync(STATE_FILE, JSON.stringify(allState), 'utf8');

    if (notification) {
      console.log(JSON.stringify({
        continue: true,
        suppressOutput: false,
        systemMessage: \`[session-heartbeat \${notification.level}] \${notification.msg}\`
      }));
    }
  } catch {
    // Fail-open
  }
  process.exit(0);
})();
`;

  fs.writeFileSync(heartbeatFile, NEW_HEARTBEAT, 'utf8');
  process.stdout.write('[DONE] patch-x03 part1: heartbeat session isolation applied\n');
}

// ======================== Part 2: pre-compact-handoff.js ========================
if (!fs.existsSync(handoffFile)) {
  process.stdout.write('[SKIP] pre-compact-handoff.js not found\n');
  process.exit(0);
}

let hoContentRaw = fs.readFileSync(handoffFile, 'utf8');
const useCRLF = hoContentRaw.includes('\r\n');
let hoContent = useCRLF ? hoContentRaw.replace(/\r\n/g, '\n') : hoContentRaw;
const HO_SENTINEL = '// [PATCH-X03-HANDOFF-RESET]';

if (hoContent.includes(HO_SENTINEL)) {
  process.stdout.write('[SKIP] patch-x03 already applied to handoff\n');
} else {
  const hoBak = handoffFile + '.bak.x03';
  if (!fs.existsSync(hoBak)) fs.writeFileSync(hoBak, hoContentRaw);

  const OLD_RESET = `    // 同时重置 heartbeat 计数器（compact 相当于新会话起点）
    const heartbeatFile = path.join(CLAUDE_ROOT, 'debug', 'session-heartbeat.json');
    if (fs.existsSync(heartbeatFile)) {
      fs.writeFileSync(heartbeatFile, JSON.stringify({
        count: 0, lastActivity: Date.now(), notified: []
      }), 'utf8');
    }`;

  const NEW_RESET = `    // 重置当前 session 的 heartbeat 计数器 (compact = 新起点) ${HO_SENTINEL}
    const heartbeatPath = path.join(CLAUDE_ROOT, 'debug', 'session-heartbeat.json');
    if (fs.existsSync(heartbeatPath)) {
      try {
        const hbAll = JSON.parse(fs.readFileSync(heartbeatPath, 'utf8'));
        const hbSid = hookData.session_id || 'default';
        if (hbAll[hbSid]) {
          hbAll[hbSid] = { count: 0, lastActivity: Date.now(), notified: [] };
          fs.writeFileSync(heartbeatPath, JSON.stringify(hbAll), 'utf8');
        }
      } catch { /* 损坏则跳过, heartbeat 超时会自然重置 */ }
    }`;

  if (!hoContent.includes(OLD_RESET)) {
    process.stdout.write('[WARN] handoff old reset block not found, skipping part2\n');
  } else {
    hoContent = hoContent.replace(OLD_RESET, NEW_RESET);
    const finalContent = useCRLF ? hoContent.replace(/\n/g, '\r\n') : hoContent;
    fs.writeFileSync(handoffFile, finalContent, 'utf8');
    process.stdout.write('[DONE] patch-x03 part2: handoff session-scoped reset applied\n');
  }
}

// 验证
const v1 = fs.readFileSync(heartbeatFile, 'utf8');
const v2 = fs.readFileSync(handoffFile, 'utf8');
const ok1 = v1.includes(SENTINEL) && v1.includes('allState[sid]');
const ok2 = v2.includes(HO_SENTINEL) && v2.includes('hbAll[hbSid]');
process.stdout.write(ok1 && ok2 ? '[VERIFY] both files patched correctly\n' : '[WARN] partial verification — check manually\n');
process.exit(0);