const path = require('path');

function getCadType(filename) {
  const baseName = path.basename(filename).toLowerCase();
  const match = baseName.match(/\.(prt|asm|drw|dwr)(?:\.\d+)?$/);
  return match ? match[1] : null;
}

function findDestination(filename, config) {
  const cadType = getCadType(filename);
  const globalDestination = typeof config?.destination === 'string' ? config.destination.trim() : '';

  if (globalDestination && cadType) {
    return globalDestination;
  }

  for (const rule of config.rules || []) {
    if ((rule.ext || '').toLowerCase() !== cadType) {
      continue;
    }

    if (!rule.pattern) {
      return rule.destination;
    }

    const regex = new RegExp(rule.pattern);
    if (regex.test(path.basename(filename))) {
      return rule.destination;
    }
  }

  return null;
}

function isCadFile(filename) {
  return Boolean(getCadType(filename));
}

module.exports = { findDestination, isCadFile };