How do Delete wishlist item in magento 1.9 by programatically?

  $wishList = Mage::getSingleton('wishlist/wishlist')->loadByCustomer($userId);
            $wishListItemCollection = $wishList->getItemCollection();
            foreach ($wishListItemCollection as $item) {
               $w_product_id = $item->getProductId();
                if ($w_product_id==$product_id) {
                    $item->delete();
                   
                    echo 'Deleted successfully';
                }else{
                    echo 'Not Deleted';

                }

How do List to wishlist item in magento 1.9 by programatically?

$itemCollection = Mage::getModel('wishlist/item')->getCollection()->addCustomerIdFilter($customarId);
 foreach($itemCollection as $product) {
                   
                    $product_id = $product->getId(),
                   
                 
                
            }

How do I add to wishlist in magento 1.9 by programatically?

$wishlist = Mage::getModel('wishlist/wishlist')->loadByCustomer($customerId, true);
$product = Mage::getModel('catalog/product')->load($productId);

$buyRequest = new Varien_Object(array()); // any possible options that are configurable and you want to save with the product

$result = $wishlist->addNewItem($product, $buyRequest);
$wishlist->save();

How to get list billing address and list shipping address by customer id in magento 1.9

$customerId = 2;
$customer = Mage::getModel('customer/customer')->load($customerId);
$defaultBilling  = $customer->getDefaultBilling();
$defaultShipping = $customer->getDefaultShipping();

$allAddress = Mage::getModel('customer/address')->getCollection()->setCustomerFilter($customer);

foreach ($allAddress as $address) {
    if($defaultBilling == $address->getId()) {
        // its customer default billing address
    } else if($defaultShipping == $address->getId()) {
        // its customer default shipping address
    } else {
        // its customer other address that saved
    }
}