Woocommerce Add Coupon Based on Cart Subtotal - woocommerce

Question

I am trying to add one of three coupons to the cart automatically based on the cart subtotal ($250 or more; $150-249.99; and $75-149.99). This is what I have, but it makes the cart just spin when you update an item quantity in the cart. It seems to work when an additional new item is added to the cart or when an item in the cart is removed. However, when I increased the quantity of one item to move from the smallest discount to the medium discount, the cart page didn't load at all (it was blank). It was still blank even after I went and added a new product to the cart. I had to comment out the action to get it to load the cart.
I'd appreciate any help.
This works, except that when the cart is updated, it just spins. If you refresh, the correct discount displays (and the item count that was changed was updated.) Any idea why it would just spin like this?
add_action( 'woocommerce_before_calculate_totals', 'sbs_auto_add_coupons_total_based', 10, 1 );
function sbs_auto_add_coupons_total_based( $cart ) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
$coupon_15 = 'dicount15';
$coupon_10 = 'discount10';
$coupon_5 = 'discount5';
$applied_coupons = $cart->get_applied_coupons();
$subtotal = 0;
foreach( $cart->get_cart() as $cart_item ) {
$subtotal += $cart_item['line_subtotal'];
}
if( $subtotal >= 250 && ! in_array($coupon_15, $applied_coupons ) ){
if( in_array($coupon_10, $applied_coupons ) )
$cart->remove_coupon( $coupon_10 );
if( in_array($coupon_5, $applied_coupons ) )
$cart->remove_discount($coupon_5);
$cart->add_discount( $coupon_15 );
}
elseif( $subtotal >= 150 && ! in_array($coupon_10, $applied_coupons ) ) {
if( in_array($coupon_15, $applied_coupons ) )
$cart->remove_coupon( $coupon_15 );
if( in_array($coupon_5, $applied_coupons ) )
$cart->remove_discount($coupon_5);
$cart->add_discount( $coupon_15 );
}
elseif( $subtotal >= 75 && ! in_array($coupon_5, $applied_coupons ) ) {
if( in_array($coupon_15, $applied_coupons ) )
$cart->remove_coupon( $coupon_15 );
if( in_array($coupon_10, $applied_coupons ) )
$cart->remove_discount($coupon_10);
$cart->add_discount( $coupon_5 );
}
else {
if( in_array($coupon_15, $applied_coupons ) )
$cart->remove_coupon( $coupon_15 );
if( in_array($coupon_10, $applied_coupons ) )
$cart->remove_discount($coupon_10);
if( in_array($coupon_5, applied_coupons ) )
$cart->remove_discount($coupon_5);
}
}

Answer 1

/**
Add Coupon Based on Cart Subtotal
*/
add_action( 'woocommerce_before_cart', 'add_coupon_automatically' );
function add_coupon_automatically() {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// HERE define your subtotal
$subtotal = 100;
// HERE define your coupon code
$coupon_code = '10off';
// HERE define your coupon amount
$coupon_amount = 10;
// HERE define your coupon discount type
$discount_type = 'percent';
// HERE define your coupon description
$coupon_description = '10% off for orders over $100';
// The active coupons
$active_coupons = WC()->cart->get_coupons();
// The cart subtotal
$cart_subtotal = WC()->cart->subtotal;
// If the cart subtotal is greater than $subtotal and the coupon is not already applied
if( $cart_subtotal >= $subtotal && ! isset($active_coupons[$coupon_code]) ) {
// Add the coupon
WC()->cart->add_discount( $coupon_code );
// Display a custom notice
wc_print_notice(
sprintf( '<strong>%s</strong> coupon has been applied!', $coupon_amount . '%' ), 'notice'
);
}
}