WooCommerce En Ucuz Ürüne İndirim Uygulama

				
					/**
 * @snippet       En Ucuz Üründen Sadece 1 Adede %50 İndirim + Etiket + Koşullu Mantık @ WooCommerce 9.9.4
 * @author        Furkan Sağlam
 */

add_action( 'woocommerce_cart_loaded_from_session', 'fks_split_and_discount_one_cheapest_item', 30 );

function fks_split_and_discount_one_cheapest_item( $cart ) {
	if ( is_admin() || did_action('fks_cart_already_split') ) return;
	if ( $cart->is_empty() || count( $cart->get_cart() ) < 2 ) return;

	// Eğer daha önce indirim uygulanmışsa bir daha yapma
	foreach ( $cart->get_cart() as $item ) {
		if ( isset( $item['_fks_discounted'] ) ) {
			do_action('fks_cart_already_split');
			return;
		}
	}

	$cheapest_key = null;
	$cheapest_price = PHP_FLOAT_MAX;

	foreach ( $cart->get_cart() as $key => $item ) {
		$price = $item['data']->get_price();
		if ( $price < $cheapest_price ) {
			$cheapest_price = $price;
			$cheapest_key = $key;
		}
	}

	if ( ! $cheapest_key ) return;

	$item = $cart->get_cart_item( $cheapest_key );

	if ( $item['quantity'] == 1 ) {
		// Tek adet varsa direkt satırı değiştir (aynı satırda kalacak)
		$cart->remove_cart_item( $cheapest_key );
		$cart->add_to_cart(
			$item['product_id'],
			1,
			$item['variation_id'],
			$item['variation'],
			array( '_fks_discounted' => true )
		);
	} elseif ( $item['quantity'] >= 2 ) {
		// Satırı böl: 1 indirimli + geri kalanı normal
		$product_id   = $item['product_id'];
		$variation_id = $item['variation_id'];
		$variation    = $item['variation'];
		$remaining    = $item['quantity'] - 1;

		$cart->remove_cart_item( $cheapest_key );

		$cart->add_to_cart( $product_id, 1, $variation_id, $variation, array(
			'_fks_discounted' => true
		));

		if ( $remaining > 0 ) {
			$cart->add_to_cart( $product_id, $remaining, $variation_id, $variation );
		}
	}
}

add_action( 'woocommerce_before_calculate_totals', 'fks_apply_discounted_price', 9999 );

function fks_apply_discounted_price( $cart ) {
	if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

	foreach ( $cart->get_cart() as $item ) {
		if ( isset( $item['_fks_discounted'] ) && $item['_fks_discounted'] === true ) {
			$product = $item['data'];
			$regular_price = floatval( $product->get_regular_price() );
			$discounted_price = wc_format_decimal( $regular_price * 0.5, wc_get_price_decimals() );
			$product->set_price( $discounted_price );
		}
	}
}

add_filter( 'woocommerce_cart_item_name', 'fks_add_discount_label_to_item', 10, 3 );

function fks_add_discount_label_to_item( $name, $cart_item, $cart_item_key ) {
	if ( isset( $cart_item['_fks_discounted'] ) && $cart_item['_fks_discounted'] === true ) {
		$name .= '<br><small style="color:green;font-weight:bold;">%50 İndirim Uygulandı<br><span style="color:#555;">(Bu indirim sadece 1 ürün için geçerlidir.)</span></small>';
	}
	return $name;
}