(() => {
    document.querySelectorAll("[data-product-filter]").forEach((filter) => {
        const search = filter.querySelector("[data-product-search]");
        const category = filter.querySelector("[data-product-category]");
        const list = filter.closest(".card")?.querySelector("[data-product-list]");
        const rows = list ? [...list.querySelectorAll("[data-product-row]")] : [];
        const select = filter.querySelector("[data-product-select]");
        const options = select ? [...select.querySelectorAll("[data-product-option]")] : [];
        const empty = list?.parentElement.querySelector("[data-product-empty]");

        const update = () => {
            const query = (search?.value || "").trim().toLowerCase();
            const selectedCategory = category?.value || "";
            const matches = (element) => {
                const nameMatches = !query || element.dataset.productName.includes(query);
                const categoryMatches = !selectedCategory || element.dataset.productCategory === selectedCategory;
                return nameMatches && categoryMatches;
            };

            rows.forEach((row) => { row.classList.toggle("d-none", !matches(row)); });
            options.forEach((option) => { option.hidden = !matches(option); });
            if (empty) empty.classList.toggle("d-none", rows.some((row) => !row.classList.contains("d-none")));
        };

        search?.addEventListener("input", update);
        category?.addEventListener("change", update);
        update();
    });

    const amountModal = document.getElementById("amount-modal");
    const amountForm = document.getElementById("amount-form");
    const amountInput = document.getElementById("modal-amount");
    const amountProductName = document.getElementById("amount-product-name");

    if (amountModal && amountForm && amountInput && amountProductName) {
        let backdrop;

        const closeAmountModal = () => {
            amountModal.classList.remove("show");
            amountModal.style.display = "none";
            amountModal.setAttribute("aria-hidden", "true");
            document.body.classList.remove("modal-open");
            backdrop?.remove();
        };

        const openAmountModal = (item) => {
            amountForm.action = `/lists/${window.location.pathname.split("/")[2]}/items/${item.dataset.itemId}/amount`;
            amountProductName.textContent = item.dataset.productName;
            amountInput.value = item.dataset.itemAmount;
            amountModal.classList.add("show");
            amountModal.style.display = "block";
            amountModal.setAttribute("aria-hidden", "false");
            document.body.classList.add("modal-open");
            backdrop = document.createElement("div");
            backdrop.className = "modal-backdrop fade show";
            backdrop.addEventListener("click", closeAmountModal);
            document.body.append(backdrop);
            amountInput.focus();
        };

        document.querySelectorAll(".shopping-list-item").forEach((item) => {
            const swipeContainer = item.closest(".shopping-list-swipe");
            let touchStartX = 0;
            let touchStartY = 0;
            let swiped = false;
            let touchMoved = false;

            item.addEventListener("click", (event) => {
                if (swiped) {
                    swiped = false;
                    event.preventDefault();
                    return;
                }
                if (event.target.closest("form, button, a, input, select")) return;
                openAmountModal(item);
            });
            item.addEventListener("keydown", (event) => {
                if (event.key === "Enter" || event.key === " ") {
                    event.preventDefault();
                    openAmountModal(item);
                }
            });

            item.addEventListener("touchstart", (event) => {
                const touch = event.changedTouches[0];
                touchStartX = touch.clientX;
                touchStartY = touch.clientY;
                swiped = false;
                touchMoved = false;
                swipeContainer?.classList.remove("is-swiping");
                swipeContainer?.classList.remove("swipe-left", "swipe-right");
            }, { passive: true });

            item.addEventListener("touchmove", (event) => {
                const touch = event.changedTouches[0];
                const deltaX = touch.clientX - touchStartX;
                const deltaY = touch.clientY - touchStartY;
                if (Math.abs(deltaX) <= Math.abs(deltaY) || Math.abs(deltaX) < 8) return;

                touchMoved = true;
                event.preventDefault();
                swipeContainer?.classList.add("is-swiping");
                swipeContainer?.classList.toggle("swipe-left", deltaX < 0);
                swipeContainer?.classList.toggle("swipe-right", deltaX > 0);
                item.style.transform = `translateX(${Math.max(-120, Math.min(120, deltaX))}px)`;
            }, { passive: false });

            item.addEventListener("touchend", (event) => {
                const touch = event.changedTouches[0];
                const deltaX = touch.clientX - touchStartX;
                const deltaY = touch.clientY - touchStartY;
                item.style.transform = "";
                swipeContainer?.classList.remove("is-swiping");
                swipeContainer?.classList.remove("swipe-left", "swipe-right");
                if (!touchMoved || Math.abs(deltaX) < 70 || Math.abs(deltaX) < Math.abs(deltaY)) return;

                swiped = true;
                event.preventDefault();
                if (deltaX < 0) {
                    fetch(item.dataset.toggleUrl, { method: "POST" }).then((response) => {
                        if (response.ok) window.location.reload();
                    });
                } else if (confirm("Product verwijderen?")) {
                    fetch(item.dataset.deleteUrl, { method: "DELETE" }).then((response) => {
                        if (response.ok) window.location.reload();
                    });
                }
            }, { passive: false });
        });

        amountModal.querySelectorAll("[data-bs-dismiss='modal']").forEach((button) => {
            button.addEventListener("click", closeAmountModal);
        });
        document.addEventListener("keydown", (event) => {
            if (event.key === "Escape" && amountModal.classList.contains("show")) closeAmountModal();
        });
    }

    const logoutLink = document.querySelector('a[href="/logout"]');
    if (!logoutLink) return;

    const socket = window.io && window.io();
    if (!socket) return;

    logoutLink.addEventListener("click", (event) => {
        event.preventDefault();
        socket.disconnect();
        window.location.assign(logoutLink.href);
    });

    const listMatch = window.location.pathname.match(/^\/lists\/(\d+)$/);
    if (listMatch) socket.emit("list:join", listMatch[1]);

    socket.on("list:updated", ({ listId }) => {
        if (window.location.pathname === `/lists/${listId}`) window.location.reload();
    });
})();