WooCommerce Coupon Validation for WCFM Vendor Products based on Minimum and Maximum Spend

add_filter('woocommerce_coupon_is_valid', function($is_valid, $coupon, $obj) {
$coupon_author = get_post_field( 'post_author', $coupon->get_id() );
if(!wcfm_is_vendor($coupon_author)) return $is_valid;
$object = $obj->get_object();
$total_item_cost = 0;
if ( is_a( $object, 'WC_Cart' ) ) {
foreach ( wc()->cart->get_cart() as $cart_item ) {
$product = wc_get_product( $cart_item['data']->get_id() );
$vendor_id = wcfm_get_vendor_id_by_post( $product->get_id() );
if ( $vendor_id && $vendor_id == $coupon_author) {
$total_item_cost += $cart_item['line_subtotal'];
if($object->display_prices_including_tax()) {
$total_item_cost += $cart_item['line_subtotal_tax'];
}
}
}
} elseif ( is_a( $object, 'WC_Order' ) ) {
$line_items = $object->get_items( 'line_item' );
foreach($line_items as $item) {
$line_item = new WC_Order_Item_Product($item);
$product_id = $line_item->get_product_id();
$vendor_id = wcfm_get_vendor_id_by_post($product_id);
if ( $vendor_id && $vendor_id == $coupon_author) {
$total_item_cost += $line_item->get_subtotal();
if ( $object->get_prices_include_tax() ) {
$total_item_cost += $line_item->get_subtotal_tax();
}
}
}
}
if($coupon->get_minimum_amount() > 0 && $coupon->get_minimum_amount() > $total_item_cost ) {
throw new Exception( sprintf( __( 'The minimum spend for this coupon is %s.', 'woocommerce' ), wc_price( $coupon->get_minimum_amount() ) ), 108 );
}
if($coupon->get_maximum_amount() > 0 && $coupon->get_minimum_amount() < $total_item_cost ) {
throw new Exception( sprintf( __( 'The maximum spend for this coupon is %s.', 'woocommerce' ), wc_price( $coupon->get_maximum_amount() ) ), 112 );
}
return $is_valid;
}, 10, 3);