WP_Query sort by meta_value_num or date

Got it working with the following method. There’s probably a better way to do it but this is good enough for it’s purpose.

Added IF statement for options

if($_POST['date'] === 'HIGH'){
    $order="meta_value_num";
    $sort="DESC";
}
elseif ($_POST['date'] === 'LOW'){
    $order="meta_value_num";
    $sort="ASC";
}
elseif ($_POST['date'] === 'ASC'){
    $order="date";
    $sort="ASC";
}
elseif ($_POST['date'] === 'DESC'){
    $order="date";
    $sort="DESC";
}

Then inside the $args

$args = array(
    'order' => $sort,
    'post_type' => 'product',
    'meta_key' => 'ek-product-price',
    'orderby' => $order,
)

Form

<select id="select1" type="text" name="date">
  <option value="ASC" type="hidden">ASC</option>
  <option value="DESC" type="hidden">DESC</option>
  <option value="HIGH" type="hidden">HIGH</option>
  <option value="LOW" type="hidden">LOW</option>
</select>