CatalogPageViewController.swift

extension CatalogPageViewController: UICollectionViewDelegate {
    public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        switch viewModel.data[indexPath.row] {
        case let data as Product:
            Router.route(.productDetailPage(productID: data))
        default:
            fatalError("can't read the data")
        }
    }
}