// api_v1/scanner/scanActivityFiles.js
const fsp = require('fs/promises');
const path = require('path');

const SUPPORTED_ACTIVITY_EXTS = new Set(['.fit', '.gpx', '.tcx']);

async function* scanActivityFiles(user, cartella, absCartella, db) {
  async function* walk(dir) {
    // Gli errori non vengono nascosti: una scansione incompleta
    // non deve causare la cancellazione delle attività esistenti.
    const entries = await fsp.readdir(dir, { withFileTypes: true });

    for (const entry of entries) {
      const absPath = path.join(dir, entry.name);

      if (entry.isDirectory()) {
        yield* walk(absPath);
        continue;
      }

      if (!entry.isFile()) continue;

      const ext = path.extname(entry.name).toLowerCase();
      if (!SUPPORTED_ACTIVITY_EXTS.has(ext)) continue;

      const stat = await fsp.stat(absPath);
      const relPath = path.relative(absCartella, absPath)
        .split(path.sep).join('/');

      yield {
        id: `${cartella}/${relPath}`,
        file_name: entry.name,
        relPath,
        absPath,
        ext,
        stat,
        path: `/activities/${user}/original/${cartella}/${relPath}`,
      };
    }
  }

  yield* walk(absCartella);
}

module.exports = scanActivityFiles;