document.addEventListener("DOMContentLoaded", function () {

    function parsePrice(value) {
        if (!value) return null;

        let price = value.replace(/[^\d.,]/g, "");

        if (price.includes(",") && price.includes(".")) {
            price = price.replace(/,/g, "");
        } else {
            price = price.replace(",", ".");
        }

        return parseFloat(price);
    }

    function addPromotion(container, discount) {
        if (!container) return;

        const promo = container.querySelector(".promo");

        if (promo && !promo.innerHTML.includes("%")) {
            promo.innerHTML += ` <span>-${discount}%</span>`;
        }
    }

    // Product listing
    if (document.body.classList.contains("shop_product_list")) {

        document.querySelectorAll(".product").forEach(product => {

            const currentPrice = product.querySelector(".price em");
            const regularPrice = product.querySelector(".price__regular del");

            if (!currentPrice || !regularPrice) return;

            const current = parsePrice(currentPrice.textContent);
            const regular = parsePrice(regularPrice.textContent);

            if (!current || !regular || regular <= current) return;

            const discount = Math.round(100 * (1 - current / regular));

            addPromotion(product.querySelector(".tags"), discount);
        });
    }

    // Single product
    if (document.body.classList.contains("shop_product")) {

        const currentPrice = document.querySelector(
            "#box_productfull .price .main-price.color"
        );

        const regularPrice = document.querySelector(
            "#box_productfull .price__regular del"
        );

        const tags = document.querySelector(
            "#box_productfull .productdetailsimgsize .tags"
        );

        if (!currentPrice || !regularPrice || !tags) return;

        const current = parsePrice(currentPrice.textContent);
        const regular = parsePrice(regularPrice.textContent);

        if (!current || !regular || regular <= current) return;

        const discount = Math.round(100 * (1 - current / regular));

        addPromotion(tags, discount);
    }

});