// api_v1/scanner/scanActivityCartella.js
const scanActivityFiles = require('./scanActivityFiles');
const {
  enqueueActivityIngestJobs,
} = require('./activityIngestQueue');
const { sha256 } = require('./utils');
const { log } = require('./logger');

const BATCH_SIZE = 100;

async function scanActivityCartella(
  db,
  user,
  cartella,
  absCartella,
  newActivities,
  updateStatusFile,
  CURRENT,
  TOTAL_FILES,
  start,
  deleteFromDB,
  onProgress
) {
  log(`📁 [SCAN ACTIVITY CARTELLA] ${cartella}`);

  // Se la lettura del filesystem fallisce, lo scan deve fallire:
  // non dobbiamo interpretare tutti i record come orfani.
  const rows = await db('activities')
    .where({ user, cartella })
    .select('id');

  const idsSet = new Set(rows.map(r => r.id));
  const files = [];

  // Prima scopriamo tutti i file. Nessun orfano viene cancellato
  // se la scoperta o l'accodamento falliscono.
  for await (const f of scanActivityFiles(user, cartella, absCartella, db)) {
    files.push(f);
  }

  for (let offset = 0; offset < files.length; offset += BATCH_SIZE) {
    const batch = files.slice(offset, offset + BATCH_SIZE);

    const jobs = batch.map(f => ({
      user,
      cartella,
      relPath: f.relPath,
      mtimeMs: f.stat.mtimeMs,
      sizeBytes: f.stat.size,
    }));

    // Una transazione per batch, anziché una per file.
    const results = await enqueueActivityIngestJobs(db, jobs);

    for (let i = 0; i < batch.length; i++) {
      const f = batch[i];
      const result = results[i];

      CURRENT.value++;
      idsSet.delete(sha256(`${user}/${cartella}/${f.relPath}`));

      log(
        `📥 [ACTIVITY QUEUE] ${f.relPath} ` +
        `status=${result.status}` +
        `${result.inserted ? ' inserted' : ''}` +
        `${result.updated ? ' updated' : ''}` +
        `${result.unchanged ? ' unchanged' : ''}`
      );
    }

    // Aggiorna l'interfaccia una volta per batch, non per file.
    await updateStatusFile(CURRENT, TOTAL_FILES, start);
    if (onProgress) await onProgress();
  }

  // Questa sezione viene raggiunta soltanto se tutti i batch
  // sono stati accodati correttamente.
  for (const orphanId of idsSet) {
    log(`🔴 [ORPHAN ACTIVITY] ${orphanId}`);
    await deleteFromDB(orphanId, user);
  }
}

module.exports = scanActivityCartella;