// Whole-source sweep (READ-ONLY): find serials with same-day multi-runs (distinct values)
// and measure how many the DB does NOT hold the latest run for. Scans the import's .DAT sources.
const fs = require('fs');
const path = require('path');
const db = require('./database/db');

const ROOTS = ['C:/Shares/test/Ate/HISTLOGS'];           // central combined logs first
const STATION_BASE = 'C:/Shares/test';

function datFiles(dir, out) {
  let it = []; try { it = fs.readdirSync(dir, { withFileTypes: true }); } catch { return out; }
  for (const e of it) { const p = path.join(dir, e.name);
    if (e.isDirectory()) datFiles(p, out);
    else if (/\.dat$/i.test(e.name)) out.push(p);
  }
  return out;
}

// signature of a record = the 5 Error(%) columns joined (distinguishes runs)
function recSig(block) {
  const errs = [];
  for (const l of block) {
    if (/,"(PASS|FAIL)"/.test(l)) { const f = l.split(','); if (f.length >= 5) { errs.push(f[3].trim()); if (errs.length === 5) break; } }
  }
  return errs.length === 5 ? errs.join('|') : null;
}

(async () => {
  // gather files: HISTLOGS, then station LOGS (mirrors import order; station = latest)
  let files = [];
  for (const r of ROOTS) datFiles(r, files);
  let stations = [];
  try { stations = fs.readdirSync(STATION_BASE, { withFileTypes: true }).filter(d => d.isDirectory() && /^TS-\d+[LR]?$/i.test(d.name)).map(d => d.name); } catch {}
  for (const s of stations) datFiles(path.join(STATION_BASE, s, 'LOGS'), files);
  console.log('Scanning ' + files.length + ' .DAT files (' + stations.length + ' stations + HISTLOGS)...');

  // serial -> date -> { sigs:Set, last:sig }
  const map = new Map();
  let recCount = 0, fi = 0;
  for (const f of files) {
    fi++; if (fi % 3000 === 0) console.log('  ...' + fi + '/' + files.length + ' files, ' + recCount + ' records');
    let lines; try { lines = fs.readFileSync(f, 'utf8').split('\n'); } catch { continue; }
    let block = [];
    for (let i = 0; i < lines.length; i++) {
      const t = lines[i].trim();
      const sd = t.match(/^"(\d+-\d+[A-Za-z]?)","(\d{2}-\d{2}-\d{4})"$/);
      if (sd) {
        const sig = recSig(block);
        if (sig) {
          recCount++;
          const sn = sd[1]; const [mm,dd,yy] = sd[2].split('-'); const date = `${yy}-${mm}-${dd}`;
          let dm = map.get(sn); if (!dm) { dm = new Map(); map.set(sn, dm); }
          let e = dm.get(date); if (!e) { e = { sigs: new Set(), last: null }; dm.set(date, e); }
          e.sigs.add(sig); e.last = sig;
        }
        block = [];
      } else if (t) block.push(t);
    }
  }
  console.log('Parsed ' + recCount + ' records, ' + map.size + ' distinct serials.');

  // find serials with same-day multi-runs (>=2 distinct sigs on one date)
  const multi = [];   // { sn, date, runs, lastSig }
  for (const [sn, dm] of map) for (const [date, e] of dm) if (e.sigs.size >= 2) multi.push({ sn, date, runs: e.sigs.size, lastSig: e.last });
  console.log('Serials*date with same-day multi-runs (distinct values): ' + multi.length);
  const multiSerials = new Set(multi.map(m => m.sn));
  console.log('Distinct serials affected: ' + multiSerials.size);

  // For each, check what the DB holds vs the latest same-day run
  const sns = [...multiSerials];
  const dbMap = new Map();
  for (let i = 0; i < sns.length; i += 1000) {
    const rows = await db.query('SELECT serial_number, test_date, raw_data FROM test_records WHERE serial_number = ANY($1)', [sns.slice(i, i+1000)]);
    for (const r of rows) dbMap.set(r.serial_number, r);
  }
  let notLatest = 0, dbNewer = 0, dbAbsent = 0, dbMatches = 0, examples = [];
  for (const m of multi) {
    const d = dbMap.get(m.sn);
    if (!d) { dbAbsent++; continue; }
    const dbDate = d.test_date && d.test_date.toISOString ? d.test_date.toISOString().slice(0,10) : String(d.test_date);
    if (dbDate > m.date) { dbNewer++; continue; }            // DB has an even later test -> fine
    if (dbDate < m.date) { notLatest++; if (examples.length<15) examples.push(`${m.sn}: DB date ${dbDate} < multirun ${m.date}`); continue; }
    const dbSig = recSig((d.raw_data||'').split('\n').map(s=>s.trim()));
    if (dbSig === m.lastSig) dbMatches++;
    else { notLatest++; if (examples.length<15) examples.push(`${m.sn} (${m.date}, ${m.runs} runs): DB sig != latest`); }
  }

  const out = [];
  const L = s => { out.push(s); console.log(s); };
  L('\n========== SAME-DAY RETEST EXPOSURE (whole source) ==========');
  L('Records parsed                       : ' + recCount);
  L('Distinct serials in source           : ' + map.size);
  L('Serial+date with same-day multi-runs : ' + multi.length);
  L('Distinct serials affected            : ' + multiSerials.size);
  L('');
  L('Of those same-day multi-run (serial,date) groups, the DB row:');
  L('  matches the LATEST same-day run    : ' + dbMatches);
  L('  does NOT hold the latest run       : ' + notLatest + '   <-- faithfulness violations');
  L('  holds an even newer-date test (ok) : ' + dbNewer);
  L('  serial absent from DB              : ' + dbAbsent);
  if (examples.length) { L(''); L('Examples (not-latest):'); examples.forEach(x=>L('  '+x)); }
  if (process.argv[2]) fs.writeFileSync(process.argv[2], out.join('\n')+'\n');
  await db.close();
})().catch(e => { console.error(e); process.exit(1); });