Add discount amount based on the cart total Woocommerce

add_action( 'woocommerce_cart_calculate_fees', 'code_discount_based_on_total',25, 1 );
function code_discount_based_on_total( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

    $total = $cart->cart_contents_total;

    if( $total >= 200 &amp;amp;&amp;amp; $total < 500 ){
       $discount = $total * 0.1;
 // Percentage discount (10%)
    }
    else if( $total >= 500  &amp;amp;&amp;amp; $total < 1000 ){
        $discount = $total * 0.15;
 // Percentage discount (15%)
    }
    else if( $total >= 1000 ){
        $discount = $total * 0.20;
 // Percentage discount (20%)
    }
    else{
        $discount = 0;
 // Percentage discount (0%)
    }

    $cart->add_fee( __('discount', 'woocommerce'), -$discount );