Woocommerce - buy one get one free not working PHP - php

Question

So I'm trying to get this function to work in woocommerce.
Basically what it needs to do is give one product for free in the same category, if there are two items bought. I can't seem to get it to work though. Any idea what is wrong in my code?
So it needs to check the category,
If two products from the same category are in the cart. The cheapest one of the two needs to be free.
// Function to charge for only 1 product in a specific category when buying 2 products
function bogo_product_category() {
// Hook into the "woocommerce_before_calculate_totals" action
add_action( 'woocommerce_before_calculate_totals', 'bogo_product_category_calculate' );
add_action( 'woocommerce_before_cart_item_quantity_zero', 'bogo_product_category_return_price' );
}
function bogo_product_category_calculate( $cart ) {
// Set the target category ID
$category_id = 38;
// Initialize a variable to store the quantity of products in the target category
$target_category_quantity = 0;
$free_product = false;
// Loop through cart items
foreach ( $cart->get_cart() as $cart_item ) {
if ( has_term( $category_id, 'product_cat', $cart_item['product_id'] ) ) {
// If the item is in the target category
$target_category_quantity += $cart_item['quantity'];
}
}
// Loop through cart items again
foreach ( $cart->get_cart() as $cart_item ) {
if ( has_term( $category_id, 'product_cat', $cart_item['product_id'] ) ) {
// If the item is in the target category
if($target_category_quantity >= 2) {
if(!$free_product){
$free_product = true;
}else{
$cart_item['data']->set_price(0);
$cart_item['data']->set_regular_price(0);
$cart_item['data']->set_sale_price(0);
}
}
}
}
//Calculate the cart total
$cart->calculate_totals();
}
function bogo_product_category_return_price( $cart_item_key ) {
$cart = WC()->cart;
// Set the target category ID
$category_id = 38;
// Initialize a variable to store the quantity of products in the target category
$target_category_quantity = 0;
$free_product = false;
// Loop through cart items
foreach ( $cart->get_cart() as $cart_item ) {
if ( has_term( $category_id, 'product_cat', $cart_item['product_id'] ) ) {
// If the item is in the target category
$target_category_quantity += $cart_item['quantity'];
}
}
//If the target category quantity is less than 2 then return the price of the product
if($target_category_quantity < 2) {
$item = $cart->get_cart_item( $cart_item_key );
$item['data']->set_price($item['data']->get_regular_price());
$cart->calculate_totals();
}
}