document.addEventListener('DOMContentLoaded', function () {
    document.querySelectorAll('[data-cart-decrement]').forEach(function (button) {
        button.addEventListener('click', function () {
            const quantity = Number(button.dataset.currentQuantity || '0');
            const removeForm = document.getElementById(button.dataset.removeFormId);
            const updateForm = document.getElementById(button.dataset.updateFormId);

            if (quantity <= 1) {
                if (window.confirm('Удалить товар из корзины?') && removeForm) {
                    removeForm.submit();
                }
                return;
            }

            if (updateForm) {
                updateForm.submit();
            }
        });
    });

    const checkoutForm = document.querySelector('[data-checkout-form]');
    if (!checkoutForm) {
        return;
    }

    const productsTotal = Number(checkoutForm.dataset.productsTotal || '0');
    const deliveryPrice = 500;
    const floorLiftPrice = 45;
    const totalNodes = document.querySelectorAll('[data-checkout-total-text]');
    const deliveryNode = document.querySelector('[data-delivery-total-text]');
    const floorLiftNode = document.querySelector('[data-floor-lift-total-text]');

    const formatCurrency = function (value) {
        return new Intl.NumberFormat('ru-RU', {
            minimumFractionDigits: 2,
            maximumFractionDigits: 2,
        }).format(value) + ' руб.';
    };

    const updateCheckoutTotals = function () {
        const selectedDelivery = checkoutForm.querySelector('input[name="delivery_method"]:checked');
        const hasDelivery = selectedDelivery && selectedDelivery.value === 'courier';
        const deliveryTotal = hasDelivery ? deliveryPrice : 0;
        const floorLiftTotal = hasDelivery ? floorLiftPrice : 0;
        const total = productsTotal + deliveryTotal + floorLiftTotal;

        totalNodes.forEach(function (node) {
            node.textContent = formatCurrency(total);
        });
        if (deliveryNode) {
            deliveryNode.textContent = formatCurrency(deliveryTotal);
        }
        if (floorLiftNode) {
            floorLiftNode.textContent = formatCurrency(floorLiftTotal);
        }
    };

    checkoutForm.querySelectorAll('input[name="delivery_method"]').forEach(function (input) {
        input.addEventListener('change', updateCheckoutTotals);
    });
    updateCheckoutTotals();
});