(function () {
    "use strict";

    var page = document.querySelector("[data-aksrt-cart-page]");
    if (!page || !window.aksrtData) {
        return;
    }

    var CART_KEY = "aksrt_cart";
    var currencySymbol = page.getAttribute("data-currency-symbol") || "¥";
    var itemsEl = page.querySelector("[data-aksrt-cart-items]");
    var subtotalEl = page.querySelector("[data-aksrt-summary-subtotal]");
    var shippingEl = page.querySelector("[data-aksrt-summary-shipping]");
    var discountEl = page.querySelector("[data-aksrt-summary-discount]");
    var totalEl = page.querySelector("[data-aksrt-summary-total]");
    var previewMessageEl = page.querySelector("[data-aksrt-preview-message]");
    var createBtn = page.querySelector("[data-aksrt-create-order]");
    var previewBtn = page.querySelector("[data-aksrt-preview-checkout]");

    var previewState = null;
    var searchParams = new URLSearchParams(window.location.search);

    function getCart() {
        try {
            var parsed = JSON.parse(localStorage.getItem(CART_KEY) || "[]");
            return Array.isArray(parsed) ? parsed : [];
        } catch (error) {
            return [];
        }
    }

    function setCart(items) {
        localStorage.setItem(CART_KEY, JSON.stringify(items));
    }

    function money(value) {
        return currencySymbol + Number(value || 0).toFixed(2);
    }

    function selectedValue(name) {
        var checked = page.querySelector('input[name="' + name + '"]:checked');
        return checked ? checked.value : "";
    }

    function getPayload() {
        var items = getCart().map(function (item) {
            return {
                product_id: Number(item.product_id || item.id || 0),
                quantity: Number(item.qty || item.quantity || 1)
            };
        }).filter(function (item) {
            return item.product_id > 0;
        });

        return {
            items: items,
            coupon_code: (page.querySelector("[data-aksrt-coupon-code]") || {}).value || "",
            shipping_method: selectedValue("aksrt_cart_shipping"),
            address_id: Number(selectedValue("aksrt_cart_address") || 0),
            payment_method: selectedValue("aksrt_cart_payment"),
            customer_note: (page.querySelector("[data-aksrt-customer-note]") || {}).value || ""
        };
    }

    function renderCart() {
        var items = getCart();
        if (!items.length) {
            itemsEl.innerHTML = '' +
                '<div class="aksrt-cart-page__empty">' +
                '<i class="fas fa-shopping-cart" aria-hidden="true"></i>' +
                "<p>购物车为空，去商品页添加想购买的内容。</p>" +
                '<a href="/" class="btn-outline btn-sm">继续浏览</a>' +
                "</div>";
            subtotalEl.textContent = money(0);
            shippingEl.textContent = money(0);
            discountEl.textContent = "-" + money(0);
            totalEl.textContent = money(0);
            createBtn.disabled = true;
            previewState = null;
            return;
        }

        var total = 0;
        var html = "";
        items.forEach(function (item, index) {
            var qty = Number(item.qty || item.quantity || 1);
            var price = Number(item.price || 0);
            var lineTotal = qty * price;
            total += lineTotal;

            html += '' +
                '<article class="aksrt-cart-page__item" data-cart-index="' + index + '">' +
                (item.image ? '<img class="aksrt-cart-page__item-image" src="' + item.image + '" alt="">' : '<div class="aksrt-cart-page__item-image aksrt-cart-page__item-image--placeholder"><i class="fas fa-box"></i></div>') +
                '<div class="aksrt-cart-page__item-main">' +
                '<h3>' + (item.title || "商品") + "</h3>" +
                '<p>' + money(price) + "</p>" +
                "</div>" +
                '<div class="aksrt-cart-page__item-qty">' +
                '<button type="button" data-qty-action="dec">-</button>' +
                "<span>" + qty + "</span>" +
                '<button type="button" data-qty-action="inc">+</button>' +
                "</div>" +
                '<strong class="aksrt-cart-page__item-total">' + money(lineTotal) + "</strong>" +
                '<button type="button" class="aksrt-cart-page__item-remove" data-qty-action="remove"><i class="fas fa-trash"></i></button>' +
                "</article>";
        });

        itemsEl.innerHTML = html;
        subtotalEl.textContent = money(total);

        if (!previewState) {
            shippingEl.textContent = money(0);
            discountEl.textContent = "-" + money(0);
            totalEl.textContent = money(total);
        }
    }

    function setSummary(data) {
        previewState = data || null;
        subtotalEl.textContent = money((data && data.subtotal) || 0);
        shippingEl.textContent = money((data && data.shipping_fee) || 0);
        discountEl.textContent = "-" + money((data && data.discount) || 0);
        totalEl.textContent = money((data && data.total) || 0);
        createBtn.disabled = !data;
    }

    function request(path, body) {
        return fetch("/wp-json/aksrt/v1" + path, {
            method: "POST",
            headers: {
                "Content-Type": "application/json",
                "X-WP-Nonce": aksrtData.restNonce
            },
            body: JSON.stringify(body || {})
        }).then(function (response) {
            return response.json();
        });
    }

    function previewCheckout() {
        var payload = getPayload();
        if (!payload.items.length) {
            previewMessageEl.textContent = "请先添加商品后再试算。";
            return;
        }

        previewBtn.disabled = true;
        previewMessageEl.textContent = "正在试算订单...";

        request("/shop/frontend/checkout/preview", payload)
            .then(function (result) {
                if (!result.success) {
                    setSummary(null);
                    previewMessageEl.textContent = result.message || "试算失败。";
                    return;
                }

                setSummary(result.data);
                previewMessageEl.textContent = "已完成试算，可直接创建订单。";
            })
            .catch(function () {
                setSummary(null);
                previewMessageEl.textContent = "网络错误，请稍后重试。";
            })
            .finally(function () {
                previewBtn.disabled = false;
            });
    }

    function createOrder() {
        var payload = getPayload();
        if (!previewState) {
            previewCheckout();
            return;
        }

        createBtn.disabled = true;
        request("/shop/frontend/orders", payload)
            .then(function (result) {
                if (!result.success) {
                    previewMessageEl.textContent = result.message || "订单创建失败。";
                    createBtn.disabled = false;
                    return;
                }

                localStorage.removeItem(CART_KEY);
                var orderNumber = (result.data && result.data.order_number) || "";
                var ordersUrl = window.location.pathname.replace("cart", "orders") + "?order_status=pending";

                if (!orderNumber) {
                    window.location.href = ordersUrl;
                    return;
                }

                // 立即发起支付：跳转型网关直接前往第三方，余额型同步完成。
                request("/shop/frontend/orders/" + orderNumber + "/pay", {})
                    .then(function (pay) {
                        var data = (pay && pay.data) || {};
                        if (pay && pay.success && data.redirect && data.payment_url && /^https?:\/\//i.test(data.payment_url)) {
                            window.location.href = data.payment_url;
                            return;
                        }
                        // 二维码 / 余额 / 失败：统一回订单中心处理（含 ?payment 提示）。
                        window.location.href = ordersUrl;
                    })
                    .catch(function () {
                        window.location.href = ordersUrl;
                    });
            })
            .catch(function () {
                previewMessageEl.textContent = "网络错误，请稍后重试。";
                createBtn.disabled = false;
            });
    }

    page.addEventListener("click", function (event) {
        var actionButton = event.target.closest("[data-qty-action]");
        if (actionButton) {
            var itemEl = actionButton.closest("[data-cart-index]");
            var index = Number(itemEl.getAttribute("data-cart-index"));
            var items = getCart();
            if (!items[index]) {
                return;
            }

            var action = actionButton.getAttribute("data-qty-action");
            if (action === "inc") {
                items[index].qty = Number(items[index].qty || 1) + 1;
            } else if (action === "dec") {
                items[index].qty = Math.max(1, Number(items[index].qty || 1) - 1);
            } else if (action === "remove") {
                items.splice(index, 1);
            }

            setCart(items);
            setSummary(null);
            renderCart();
            return;
        }

        if (event.target.closest("[data-aksrt-clear-cart]")) {
            localStorage.removeItem(CART_KEY);
            setSummary(null);
            renderCart();
            return;
        }

        if (event.target.closest("[data-aksrt-preview-checkout]")) {
            previewCheckout();
            return;
        }

        if (event.target.closest("[data-aksrt-create-order]")) {
            createOrder();
            return;
        }

        var resumeButton = event.target.closest("[data-aksrt-resume-order]");
        if (resumeButton) {
            window.location.href = window.location.pathname.replace("cart", "orders") + "?order_status=pending";
        }
    });

    var couponInput = page.querySelector("[data-aksrt-coupon-code]");
    if (couponInput && searchParams.has("coupon")) {
        couponInput.value = searchParams.get("coupon") || "";
    }

    /* ── Address Book Management ── */

    var addressModal = page.querySelector("[data-aksrt-address-modal]");
    var addressForm = page.querySelector("[data-aksrt-address-form]");
    var addressList = page.querySelector("[data-aksrt-address-list]");
    var addressTitle = page.querySelector("[data-aksrt-address-modal-title]");

    function openAddressModal(mode, address) {
        if (!addressModal || !addressForm) return;
        addressForm.reset();
        addressForm.querySelector('[name="address_id"]').value = "";

        if (mode === "edit" && address) {
            addressTitle.textContent = "编辑地址";
            addressForm.querySelector('[name="address_id"]').value = address.id || "";
            addressForm.querySelector('[name="name"]').value = address.name || "";
            addressForm.querySelector('[name="phone"]').value = address.phone || "";
            addressForm.querySelector('[name="province"]').value = address.province || "";
            addressForm.querySelector('[name="city"]').value = address.city || "";
            addressForm.querySelector('[name="district"]').value = address.district || "";
            addressForm.querySelector('[name="address"]').value = address.address || "";
            addressForm.querySelector('[name="is_default"]').checked = !!address.is_default;
        } else {
            addressTitle.textContent = "新增地址";
        }

        addressModal.hidden = false;
    }

    function closeAddressModal() {
        if (addressModal) addressModal.hidden = true;
    }

    function refreshAddressList() {
        fetch("/wp-json/aksrt/v1/shop/frontend/address", {
            headers: { "X-WP-Nonce": aksrtData.restNonce }
        })
            .then(function (r) { return r.json(); })
            .then(function (result) {
                if (!result.success || !addressList) return;
                var addresses = (result.data && result.data.addresses) || [];
                renderAddressList(addresses);
            })
            .catch(function () {});
    }

    function renderAddressList(addresses) {
        if (!addressList) return;
        if (!addresses.length) {
            addressList.innerHTML =
                '<div class="aksrt-cart-page__address-empty" data-aksrt-address-empty>' +
                '<i class="fas fa-map-marker-alt" aria-hidden="true"></i>' +
                "<p>暂无收货地址，请先新增。</p>" +
                "</div>";
            return;
        }

        var html = "";
        addresses.forEach(function (addr, index) {
            html +=
                '<div class="aksrt-cart-page__option-card aksrt-cart-page__address-card" data-aksrt-address-card="' + addr.id + '">' +
                '<label class="aksrt-cart-page__address-label">' +
                '<input type="radio" name="aksrt_cart_address" value="' + addr.id + '"' + (index === 0 || addr.is_default ? " checked" : "") + ">" +
                '<span class="aksrt-cart-page__option-body">' +
                "<strong>" + escHtml(addr.name) + (addr.is_default ? ' <span class="aksrt-cart-page__default-tag">默认</span>' : "") + "</strong>" +
                "<span>" + escHtml(addr.phone) + "</span>" +
                "<span>" + escHtml(addr.full_text) + "</span>" +
                "</span></label>" +
                '<div class="aksrt-cart-page__address-actions">' +
                '<button type="button" class="btn-ghost btn-xs" data-aksrt-address-edit="' + addr.id + '">编辑</button>' +
                '<button type="button" class="btn-ghost btn-xs" data-aksrt-address-delete="' + addr.id + '">删除</button>' +
                (addr.is_default ? "" : '<button type="button" class="btn-ghost btn-xs" data-aksrt-address-set-default="' + addr.id + '">设为默认</button>') +
                "</div></div>";
        });
        addressList.innerHTML = html;
    }

    function escHtml(str) {
        var div = document.createElement("div");
        div.appendChild(document.createTextNode(str || ""));
        return div.innerHTML;
    }

    function getAddressById(id) {
        var cards = addressList ? addressList.querySelectorAll("[data-aksrt-address-card]") : [];
        var found = null;
        cards.forEach(function (card) {
            if (String(card.getAttribute("data-aksrt-address-card")) === String(id)) {
                var body = card.querySelector(".aksrt-cart-page__option-body");
                if (body) {
                    var spans = body.querySelectorAll("span");
                    var strong = body.querySelector("strong");
                    found = {
                        id: id,
                        name: strong ? strong.textContent.replace("默认", "").trim() : "",
                        phone: spans[0] ? spans[0].textContent : "",
                        full_text: spans[1] ? spans[1].textContent : ""
                    };
                }
            }
        });
        return found;
    }

    // Address event delegation
    page.addEventListener("click", function (event) {
        if (event.target.closest("[data-aksrt-address-add]")) {
            openAddressModal("add");
            return;
        }

        var editBtn = event.target.closest("[data-aksrt-address-edit]");
        if (editBtn) {
            var editId = editBtn.getAttribute("data-aksrt-address-edit");
            var addr = getAddressById(editId);
            openAddressModal("edit", addr);
            return;
        }

        var deleteBtn = event.target.closest("[data-aksrt-address-delete]");
        if (deleteBtn) {
            var deleteId = deleteBtn.getAttribute("data-aksrt-address-delete");
            if (!confirm("确定删除该地址吗？")) return;
            request("/shop/frontend/address/" + deleteId, {}).then(function (result) {
                if (!result.success) {
                    alert(result.message || "删除失败。");
                    return;
                }
                refreshAddressList();
            }).catch(function () { alert("网络错误。"); });
            return;
        }

        var defaultBtn = event.target.closest("[data-aksrt-address-set-default]");
        if (defaultBtn) {
            var defaultId = defaultBtn.getAttribute("data-aksrt-address-set-default");
            request("/shop/frontend/address/" + defaultId + "/default", {}).then(function (result) {
                if (!result.success) {
                    alert(result.message || "设置失败。");
                    return;
                }
                refreshAddressList();
            }).catch(function () { alert("网络错误。"); });
            return;
        }

        if (event.target.closest("[data-aksrt-address-modal-close]") || event.target.classList.contains("aksrt-modal__overlay")) {
            closeAddressModal();
        }
    });

    if (addressForm) {
        addressForm.addEventListener("submit", function (event) {
            event.preventDefault();
            var formData = new FormData(addressForm);
            var addressId = formData.get("address_id");
            var payload = {
                name: (formData.get("name") || "").trim(),
                phone: (formData.get("phone") || "").trim(),
                province: (formData.get("province") || "").trim(),
                city: (formData.get("city") || "").trim(),
                district: (formData.get("district") || "").trim(),
                address: (formData.get("address") || "").trim(),
                is_default: formData.get("is_default") === "1"
            };

            if (!payload.name || !payload.phone || !payload.address) {
                alert("请填写必填项。");
                return;
            }

            var url = addressId
                ? "/shop/frontend/address/" + addressId
                : "/shop/frontend/address";

            request(url, payload).then(function (result) {
                if (!result.success) {
                    alert(result.message || "保存失败。");
                    return;
                }
                closeAddressModal();
                refreshAddressList();
            }).catch(function () { alert("网络错误。"); });
        });
    }

    renderCart();
})();