#!/usr/bin/env node
/**
 * UserPromptSubmit Hook - 会话启动恢复器
 * 1. 检测 handoff.json 存在时注入恢复上下文并归档
 * 2. 每次会话首次 prompt 时重置 heartbeat 计数器（解决 /clear 后计数不归零问题）
 */
const fs = require('fs');
const path = require('path');

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

const SESSION_STATE_DIR = path.join(CLAUDE_ROOT, 'session-state');
const HANDOFF_PATH = path.join(SESSION_STATE_DIR, 'handoff.json');
const RESTORE_MARKER = path.join(SESSION_STATE_DIR, '.session-restored');
const HEARTBEAT_FILE = path.join(CLAUDE_ROOT, 'debug', 'session-heartbeat.json');

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

    const sessionId = hookData.session_id || '';
    let messages = [];

    // === 1. 会话 ID 变化检测 → 重置 heartbeat ===
    let lastSessionId = '';
    try {
      if (fs.existsSync(RESTORE_MARKER)) {
        lastSessionId = fs.readFileSync(RESTORE_MARKER, 'utf8').trim();
      }
    } catch (_) {}

    if (sessionId && sessionId !== lastSessionId) {
      // 新会话: 仅重置当前 session 的 heartbeat (X03 keyed 结构) // [PATCH-X05-KEYED-RESET]
      if (fs.existsSync(HEARTBEAT_FILE)) {
        try {
          const hbAll = JSON.parse(fs.readFileSync(HEARTBEAT_FILE, 'utf8'));
          hbAll[sessionId] = { count: 0, lastActivity: Date.now(), notified: [] };
          const tmp = HEARTBEAT_FILE + '.tmp.' + process.pid;
          fs.writeFileSync(tmp, JSON.stringify(hbAll), 'utf8');
          fs.renameSync(tmp, HEARTBEAT_FILE);
        } catch {
          // 损坏: 初始化为新 keyed 结构
          const init = {}; init[sessionId] = { count: 0, lastActivity: Date.now(), notified: [] };
          fs.writeFileSync(HEARTBEAT_FILE, JSON.stringify(init), 'utf8');
        }
      }
      // 记录当前 session_id
      if (!fs.existsSync(SESSION_STATE_DIR)) {
        fs.mkdirSync(SESSION_STATE_DIR, { recursive: true });
      }
      fs.writeFileSync(RESTORE_MARKER, sessionId, 'utf8');

      // === 1b. Auto Git Pull（新会话拉取最新代码）===
      try {
        const sync = require('../scripts/auto-git-sync.js');
        const pullMsgs = sync.pullLatest();
        if (pullMsgs && pullMsgs.length > 0) {
          messages.push(pullMsgs.join('\n'));
        }
      } catch (_) {} // fail-open
    }

    // === 2. Handoff 恢复 ===
    if (fs.existsSync(HANDOFF_PATH)) {
      let handoff = {};
      try {
        handoff = JSON.parse(fs.readFileSync(HANDOFF_PATH, 'utf8'));
      } catch (_) {
        fs.unlinkSync(HANDOFF_PATH);
        console.log(JSON.stringify({ continue: true, suppressOutput: true }));
        return process.exit(0);
      }

      // 检查是否过期（24 小时）
      const age = Date.now() - new Date(handoff.timestamp || 0).getTime();
      if (age > 24 * 60 * 60 * 1000) {
        const archiveName = `handoff-expired-${Date.now()}.json`;
        fs.renameSync(HANDOFF_PATH, path.join(SESSION_STATE_DIR, archiveName));
        console.log(JSON.stringify({ continue: true, suppressOutput: true }));
        return process.exit(0);
      }

      // 归档并注入恢复上下文
      const archiveName = `handoff-${Date.now()}.json`;
      fs.renameSync(HANDOFF_PATH, path.join(SESSION_STATE_DIR, archiveName));

      // [PATCH-X10-ARCHIVE-CLEANUP]
      try {
        const archives = fs.readdirSync(SESSION_STATE_DIR)
          .filter(f => /^handoff-(\d+|expired-\d+)\.json$/.test(f))
          .sort();
        if (archives.length > 20) {
          for (const old of archives.slice(0, archives.length - 20)) {
            try { fs.unlinkSync(path.join(SESSION_STATE_DIR, old)); } catch {}
          }
        }
      } catch {}

      messages.push([
        '[SESSION_RESTORE] 检测到上次会话的 handoff 记录:',
        `- 时间: ${handoff.timestamp}`,
        `- 工作目录: ${handoff.working_directory || 'unknown'}`,
        `- 工具调用数: ${handoff.tool_call_count || 'unknown'}`,
        `- 摘要: ${handoff.conversation_summary || '无'}`,
        '',
        '请检查 memory 和 task 列表以恢复上下文。'
      ].join('\n'));
    }

    if (messages.length > 0) {
      console.log(JSON.stringify({
        continue: true,
        suppressOutput: false,
        systemMessage: messages.join('\n')
      }));
    } else {
      console.log(JSON.stringify({ continue: true, suppressOutput: true }));
    }
  } catch {
    console.log(JSON.stringify({ continue: true, suppressOutput: true }));
  }
  process.exit(0);
})();