#!/usr/bin/env node
/**
 * token-saver-session-report.js · TSE Layer 5 · 2026-04-27
 * Stop · 会话效率报告
 * 解析 transcript, 统计效率指标, 写入 tse-efficiency-log.jsonl
 * 行为: fail-open
 */
'use strict';

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

var STATE_DIR = path.join(CLAUDE_ROOT, 'session-state');
var LOG_PATH = path.join(STATE_DIR, 'tse-efficiency-log.jsonl');
var MAX_TRANSCRIPT = 20 * 1024 * 1024;

(async () => {
  try {
    var hookData = {};
    try { hookData = await readStdin({ maxSize: 128 * 1024 }); } catch {}

    var tp = hookData.transcript_path;
    if (!tp || !fs.existsSync(tp)) process.exit(0);

    var stat = fs.statSync(tp);
    if (stat.size > MAX_TRANSCRIPT || stat.size < 100) process.exit(0);

    var raw = fs.readFileSync(tp, 'utf8');
    var lines = raw.split('\n').filter(Boolean);

    var m = { rounds: 0, compacts: 0, toolCalls: 0, mcpCalls: 0, agentCalls: 0,
              largeOutputs: 0, tseReadGuard: 0, tseBashLimiter: 0, tsePostGuard: 0,
              reads: 0, edits: 0, bashes: 0, models: {} };

    for (var i = 0; i < lines.length; i++) {
      var obj;
      try { obj = JSON.parse(lines[i]); } catch { continue; }

      var content = (obj && obj.message && obj.message.content) || (obj && obj.content);
      var role = obj && obj.message && obj.message.role;
      var model = obj && obj.model;

      if (role === 'assistant') m.rounds++;
      if (model) m.models[model] = (m.models[model] || 0) + 1;

      if (!Array.isArray(content)) {
        if (typeof content === 'string') {
          if (content.indexOf('[TSE') !== -1) countTse(content, m);
          if (content.indexOf('PreCompact') !== -1) m.compacts++;
        }
        continue;
      }

      for (var j = 0; j < content.length; j++) {
        var part = content[j];
        if (!part) continue;

        if (part.type === 'tool_use') {
          m.toolCalls++;
          var nm = part.name || '';
          if (nm.startsWith('mcp__')) m.mcpCalls++;
          if (nm === 'Agent') m.agentCalls++;
          if (nm === 'Read') m.reads++;
          if (nm === 'Edit' || nm === 'Write') m.edits++;
          if (nm === 'Bash') m.bashes++;
        }
        if (part.type === 'tool_result') {
          var txt = typeof part.content === 'string' ? part.content : '';
          if (txt.length > 5000) m.largeOutputs++;
        }

        var t = part.text || (typeof part === 'string' ? part : '');
        if (typeof t === 'string' && t.indexOf('[TSE') !== -1) countTse(t, m);
        if (typeof t === 'string' && t.indexOf('PreCompact') !== -1) m.compacts++;
      }
    }

    var score = 80;
    score -= Math.min(m.compacts * 8, 24);
    score -= Math.min(m.largeOutputs * 2, 20);
    score -= Math.max(0, Math.floor((m.rounds - 40) * 0.5));
    if (m.agentCalls > 0) score += 10;
    if (m.tseReadGuard + m.tseBashLimiter > 0 && m.tseReadGuard + m.tseBashLimiter < 8) score += 5;
    score = Math.max(0, Math.min(100, score));

    var grade = score >= 90 ? 'A' : score >= 80 ? 'B' : score >= 70 ? 'C' : score >= 60 ? 'D' : 'F';

    var report = {
      ts: new Date().toISOString(),
      sid: hookData.session_id || 'unknown',
      score: score,
      grade: grade,
      metrics: m
    };

    if (!fs.existsSync(STATE_DIR)) fs.mkdirSync(STATE_DIR, { recursive: true });
    fs.appendFileSync(LOG_PATH, JSON.stringify(report) + '\n', 'utf8');

    process.exit(0);
  } catch { process.exit(0); }
})();

function countTse(text, m) {
  if (text.indexOf('READ_GUARD') !== -1) m.tseReadGuard++;
  if (text.indexOf('BASH_LIMITER') !== -1) m.tseBashLimiter++;
  if (text.indexOf('POST_GUARD') !== -1) m.tsePostGuard++;
}