#!/usr/bin/env node
'use strict';
const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const TARGET = path.join(__dirname, '..', '..', 'hooks', 'route-interceptor-bundle.js');
const SENTINEL_TAG = 'ROUTE-ACC-3D-V1';

const HELPER = [
  '',
  '  // /* ROUTE-ACC-3D-V1 */ near-3-day route accuracy',
  "  let routeAccuracy3d = 'N/A';",
  '  try {',
  '    const cutoff = Date.now() - 3 * 86400 * 1000;',
  '    const files = fs.readdirSync(DEBUG_DIR).filter(function(f){return /^route-\\d{4}-\\d{2}-\\d{2}\\.jsonl$/.test(f);});',
  '    let total = 0, hit = 0;',
  '    for (const f of files) {',
  "      const lines = fs.readFileSync(path.join(DEBUG_DIR, f), 'utf8').split('\\n');",
  '      for (const L of lines) {',
  '        if (!L) continue;',
  '        try {',
  '          const j = JSON.parse(L);',
  '          const ts = new Date(j.ts).getTime();',
  '          if (!Number.isFinite(ts) || ts < cutoff) continue;',
  '          total++;',
  '          if (j.topConfidence && j.topConfidence > 0) hit++;',
  '        } catch {}',
  '      }',
  '    }',
  "    if (total > 0) routeAccuracy3d = (hit / total * 100).toFixed(1) + '%';",
  '  } catch {}',
  '',
  '  const now = new Date();',
].join('\n');

function main() {
  const src = fs.readFileSync(TARGET, 'utf8');
  if (src.includes(SENTINEL_TAG)) {
    console.log('[banner-acc] already applied, skip');
    return;
  }

  const anchor = '\n  const now = new Date();';
  if (!src.includes(anchor)) {
    console.error('[banner-acc] anchor missing');
    process.exit(1);
  }
  let next = src.replace(anchor, HELPER);

  const bannerOld = '    `active_skills: ${activeSkillCount}/${skillCount}`,';
  const bannerNew = bannerOld + '\n    `route_accuracy_3d: ${routeAccuracy3d}`,';
  if (!next.includes(bannerOld)) {
    console.error('[banner-acc] banner anchor missing');
    process.exit(1);
  }
  next = next.replace(bannerOld, bannerNew);

  const bak = TARGET + '.bak.banner-acc.' + Date.now();
  fs.copyFileSync(TARGET, bak);
  const tmp = TARGET + '.tmp.' + process.pid;
  fs.writeFileSync(tmp, next, 'utf8');
  fs.renameSync(tmp, TARGET);

  try {
    execSync('node --check "' + TARGET + '"', { stdio: 'pipe' });
    console.log('[banner-acc] OK, bak:', path.basename(bak));
  } catch (e) {
    fs.copyFileSync(bak, TARGET);
    console.error('[banner-acc] SYNTAX FAIL, rolled back:', String(e.stderr || e.message).split('\n').slice(0, 4).join(' | '));
    process.exit(1);
  }
}

main();