#!/usr/bin/env node
/**
 * check-gray-expiry.js · 2026-04-25
 * UserPromptSubmit hook. Scans state/gray-observations/*.json, if any expired
 * emits prominent banner via additionalContext so user & AI see it on session start.
 */
'use strict';
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const DIR = path.join(ROOT, 'state', 'gray-observations');

function loadObservations() {
  if (!fs.existsSync(DIR)) return [];
  const out = [];
  for (const name of fs.readdirSync(DIR)) {
    if (!name.endsWith('.json')) continue;
    try {
      const j = JSON.parse(fs.readFileSync(path.join(DIR, name), 'utf8'));
      j._file = name;
      out.push(j);
    } catch (_) {}
  }
  return out;
}

function main() {
  const now = Date.now();
  const obs = loadObservations();
  const expired = obs.filter(o => {
    if (o.resolved) return false;
    const exp = new Date(o.expires_at).getTime();
    return Number.isFinite(exp) && exp <= now;
  });
  if (expired.length === 0) process.exit(0);

  const lines = [];
  lines.push('');
  lines.push('╔══════════════════════════════════════════════════════════════╗');
  lines.push('║   ⚠️  灰度观察到期提醒 · GRAY OBSERVATION EXPIRED            ║');
  lines.push('╠══════════════════════════════════════════════════════════════╣');
  for (const o of expired) {
    lines.push('║  ID: ' + (o.observation_id || o._file).padEnd(56) + '║');
    lines.push('║  到期: ' + (o.expires_at || '').slice(0, 19).padEnd(54) + '║');
    if (o.watched_flag) lines.push('║  关注 flag: ' + String(o.watched_flag).padEnd(50) + '║');
    if (o.on_expiry_action) {
      const act = String(o.on_expiry_action);
      for (let i = 0; i < act.length; i += 58) {
        lines.push('║  → ' + act.slice(i, i + 58).padEnd(58) + '║');
      }
    }
    lines.push('║' + ' '.repeat(62) + '║');
  }
  lines.push('║  建议: 查看 manifest.jsonl 统计 → 决定 warn→enforce 升级    ║');
  lines.push('║  解决后: resolved:true 写入对应 .json 停止提醒              ║');
  lines.push('╚══════════════════════════════════════════════════════════════╝');
  lines.push('');

  const output = {
    hookSpecificOutput: {
      hookEventName: 'UserPromptSubmit',
      additionalContext: lines.join('\n'),
    },
  };
  process.stdout.write(JSON.stringify(output));
  process.exit(0);
}

try { main(); } catch (_) { process.exit(0); }