const fs = require('fs-extra');
const path = require('path');
const { getDestinationDecision, isCadFile } = require('./router');
const { buildDestinationIndex } = require('./destinationIndex');

async function processFolder(folder, config) {
  const entries = await fs.readdir(folder, { withFileTypes: true });
  const destinationIndex = await buildDestinationIndex(config?.destination);
  const result = {
    scanned: 0,
    copied: 0,
    skipped: 0,
    details: [],
  };

  for (const entry of entries) {
    if (!entry.isFile()) {
      continue;
    }

    const file = entry.name;
    result.scanned += 1;

    if (!isCadFile(file)) {
      result.skipped += 1;
      continue;
    }

    const src = path.join(folder, file);
    const decision = getDestinationDecision(file, config, destinationIndex);
    const destDir = decision.destination;

    if (!destDir) {
      result.skipped += 1;
      result.details.push({ file, reason: decision.reason || 'Nessuna regola trovata' });
      continue;
    }

    const dest = path.join(destDir, file);
    await fs.copy(src, dest, { overwrite: true });

    result.copied += 1;
    result.details.push({ file, destination: destDir });
  }

  return result;
}

module.exports = { processFolder };