/**
 * Product purchase page — options selector + server cart.
 *
 * @package AKSRT
 */
(function () {
  "use strict";

  function restBase() {
    var root = (window.aksrtData && aksrtData.siteUrl) ? String(aksrtData.siteUrl).replace(/\/$/, "") : "";
    return root + "/wp-json/aksrt/v1";
  }

  function restNonce() {
    return (window.aksrtData && aksrtData.restNonce) || "";
  }

  function toast(msg, type) {
    if (typeof window.aksrtToast === "function") {
      window.aksrtToast(msg, type || "info");
      return;
    }
    if (window.aksrt && typeof aksrt.notyf === "function") {
      aksrt.notyf(msg, { type: type || "info" });
      return;
    }
    window.alert(msg);
  }

  function rest(path, method, body) {
    var opts = {
      method: method || "GET",
      credentials: "same-origin",
      headers: {
        "X-WP-Nonce": restNonce(),
      },
    };
    if (body !== undefined) {
      opts.headers["Content-Type"] = "application/json";
      opts.body = JSON.stringify(body);
    }
    return fetch(restBase() + path, opts).then(function (r) {
      return r.json();
    });
  }

  function money(value, payModo) {
    var n = Number(value || 0).toFixed(2);
    return payModo === "points" ? n : "¥" + n;
  }

  /* ── Product page ── */
  var productPage = document.querySelector("[data-aksrt-product-page]");
  if (productPage) {
    var quantityInput = productPage.querySelector("[data-aksrt-quantity]");
    var productId = Number(productPage.getAttribute("data-product-id") || 0);
    var titleEl = productPage.querySelector(".aksrt-product-page__title");
    var imageEl = productPage.querySelector(".aksrt-product-page__primary-image img");
    var priceEl = productPage.querySelector("[data-aksrt-dynamic-price], .aksrt-product-page__price");
    var stockEl = productPage.querySelector("[data-aksrt-stock-display]");
    var couponEl = productPage.querySelector("[data-aksrt-product-coupon]");
    var optionsRoot = productPage.querySelector("[data-aksrt-options-selector]");
    var optionResult = productPage.querySelector("[data-aksrt-option-result]");
    var selectedLabelsEl = productPage.querySelector("[data-aksrt-selected-labels]");
    var resolvedPriceEl = productPage.querySelector("[data-aksrt-resolved-price]");
    var resolvedStockEl = productPage.querySelector("[data-aksrt-resolved-stock]");
    var payModo = productPage.getAttribute("data-pay-modo") || "0";
    var basePrice = Number(productPage.getAttribute("data-base-price") || 0);
    var baseStock = Number(productPage.getAttribute("data-base-stock") || 0);
    var selectedByGroup = {};
    var groupCount = optionsRoot
      ? optionsRoot.querySelectorAll(".aksrt-product-page__option-group").length
      : 0;

    function currentOptionsKey() {
      if (!groupCount) return "";
      var labels = [];
      for (var i = 0; i < groupCount; i++) {
        if (!selectedByGroup[i]) return null;
        labels.push(selectedByGroup[i].label);
      }
      return labels.join("|");
    }

    function resolveSelection() {
      if (!groupCount) {
        return {
          key: "",
          labels: "",
          price: basePrice,
          stock: baseStock,
          image: "",
        };
      }
      var key = currentOptionsKey();
      if (key === null) return null;

      var price = basePrice;
      var image = "";
      var labels = [];
      for (var i = 0; i < groupCount; i++) {
        var sel = selectedByGroup[i];
        labels.push(sel.label);
        price += Number(sel.priceChange || 0);
        if (sel.image) image = sel.image;
      }
      return {
        key: key,
        labels: labels.join(" / "),
        price: Math.max(0, price),
        stock: baseStock,
        image: image,
      };
    }

    function paintSelection() {
      var resolved = resolveSelection();
      if (!resolved) {
        if (optionResult) optionResult.hidden = true;
        return;
      }
      if (priceEl) {
        if (groupCount && productPage.getAttribute("data-price-range") === "1" && currentOptionsKey() === null) {
          /* keep range until complete selection */
        } else {
          priceEl.textContent = money(resolved.price, payModo) + (payModo === "points" ? "" : "");
          if (payModo === "points" && priceEl.querySelector("small") === null) {
            /* leave as-is */
          }
        }
      }
      if (stockEl && resolved.stock > -1) {
        stockEl.textContent = String(resolved.stock);
      }
      if (quantityInput && resolved.stock > 0) {
        quantityInput.setAttribute("max", String(resolved.stock));
        if (Number(quantityInput.value) > resolved.stock) {
          quantityInput.value = String(resolved.stock);
        }
      }
      if (imageEl && resolved.image) {
        imageEl.setAttribute("src", resolved.image);
      }
      if (optionResult) {
        optionResult.hidden = false;
        if (selectedLabelsEl) selectedLabelsEl.textContent = resolved.labels;
        if (resolvedPriceEl) resolvedPriceEl.textContent = money(resolved.price, payModo);
        if (resolvedStockEl) {
          resolvedStockEl.textContent =
            resolved.stock <= -1 ? "库存充足" : "库存 " + resolved.stock;
        }
      }
    }

    if (optionsRoot) {
      optionsRoot.addEventListener("click", function (event) {
        var btn = event.target.closest("[data-option-group]");
        if (!btn || !optionsRoot.contains(btn)) return;
        var group = btn.getAttribute("data-option-group");
        var label = btn.getAttribute("data-option-label") || "";
        var priceChange = Number(btn.getAttribute("data-price-change") || 0);
        var image = btn.getAttribute("data-option-image") || "";

        optionsRoot
          .querySelectorAll('[data-option-group="' + group + '"]')
          .forEach(function (el) {
            el.classList.remove("is-active");
          });
        btn.classList.add("is-active");
        selectedByGroup[group] = { label: label, priceChange: priceChange, image: image };
        paintSelection();
      });
    }

    function ensureOptionsSelected() {
      if (!groupCount) return true;
      if (currentOptionsKey() === null) {
        toast("请先选择商品规格", "warning");
        return false;
      }
      return true;
    }

    function addToServerCart(replaceQty) {
      if (!window.aksrtData || !aksrtData.isLoggedIn) {
        window.location.href = (aksrtData && aksrtData.routes && aksrtData.routes.login) || "/";
        return;
      }
      if (!ensureOptionsSelected()) return;

      var qty = Number(quantityInput ? quantityInput.value : 1) || 1;
      var optionsString = currentOptionsKey() || "";
      var body = {
        product_id: productId,
        options_string: optionsString,
        count: qty,
      };

      rest("/shop/frontend/cart/add", "POST", body)
        .then(function (result) {
          if (!result || !result.success) {
            toast((result && (result.message || result.error)) || "加入购物车失败", "error");
            return;
          }
          toast("已加入购物车", "success");
          if (replaceQty) {
            var cartUrl = new URL(
              (window.aksrtData && (aksrtData.cartUrl || (aksrtData.routes && aksrtData.routes.cart))) || "/",
              window.location.origin
            );
            if (couponEl && couponEl.value) {
              cartUrl.searchParams.set("coupon", couponEl.value);
            }
            window.location.href = cartUrl.toString();
          }
        })
        .catch(function () {
          toast("网络错误，请稍后重试", "error");
        });
    }

    productPage.addEventListener("click", function (event) {
      var qtyBtn = event.target.closest("[data-aksrt-qty-action]");
      if (qtyBtn && quantityInput) {
        var action = qtyBtn.getAttribute("data-aksrt-qty-action");
        var current = Number(quantityInput.value || 1);
        var max = Number(quantityInput.getAttribute("max") || 999);
        quantityInput.value = action === "inc" ? Math.min(max, current + 1) : Math.max(1, current - 1);
        return;
      }

      if (event.target.closest("[data-aksrt-add-cart]")) {
        addToServerCart(false);
        return;
      }

      if (event.target.closest("[data-aksrt-buy-now]")) {
        addToServerCart(true);
        return;
      }

      var thumb = event.target.closest("[data-aksrt-product-thumb]");
      if (thumb && imageEl) {
        imageEl.setAttribute("src", thumb.getAttribute("data-aksrt-product-thumb"));
        return;
      }

      var videoBtn = event.target.closest("[data-aksrt-product-video]");
      if (videoBtn) {
        var url = videoBtn.getAttribute("data-aksrt-product-video");
        if (url) window.open(url, "_blank", "noopener");
        return;
      }

      var favBtn = event.target.closest("[data-aksrt-toggle-fav]");
      if (favBtn) {
        if (!window.aksrtData || !aksrtData.isLoggedIn) {
          window.location.href = (aksrtData && aksrtData.routes && aksrtData.routes.login) || "/";
          return;
        }
        var pid = Number(favBtn.getAttribute("data-aksrt-toggle-fav") || productId);
        rest("/shop/frontend/products/" + pid + "/favorite", "POST", {})
          .then(function (result) {
            if (!result || !result.success) {
              toast((result && result.message) || "操作失败", "error");
              return;
            }
            var active = !!(result.data && result.data.is_favorite);
            productPage.querySelectorAll("[data-aksrt-toggle-fav]").forEach(function (btn) {
              btn.classList.toggle("is-active", active);
            });
            toast((result.message) || (active ? "已收藏" : "已取消收藏"), "success");
          })
          .catch(function () {
            toast("网络错误", "error");
          });
        return;
      }

      var tabBtn = event.target.closest("[data-aksrt-product-tab]");
      if (tabBtn) {
        var tab = tabBtn.getAttribute("data-aksrt-product-tab");
        productPage.querySelectorAll("[data-aksrt-product-tab]").forEach(function (b) {
          b.classList.toggle("is-active", b === tabBtn);
        });
        productPage.querySelectorAll("[data-aksrt-product-panel]").forEach(function (panel) {
          panel.hidden = panel.getAttribute("data-aksrt-product-panel") !== tab;
        });
        return;
      }

      if (event.target.closest("[data-aksrt-show-params]")) {
        var paramsModal = productPage.querySelector("[data-aksrt-params-modal]");
        if (paramsModal) paramsModal.hidden = false;
        return;
      }
      if (event.target.closest("[data-aksrt-show-services]")) {
        var servicesModal = productPage.querySelector("[data-aksrt-services-modal]");
        if (servicesModal) servicesModal.hidden = false;
        return;
      }
      if (event.target.closest("[data-aksrt-close-modal]")) {
        var modal = event.target.closest("[data-aksrt-params-modal], [data-aksrt-services-modal], .aksrt-modal");
        if (modal) modal.hidden = true;
      }
    });
  }

  /* ── Product editor (seller) ── */
  var editor = document.querySelector("[data-aksrt-product-editor]");
  if (!editor || !window.aksrtData) {
    return;
  }

  var form = editor.querySelector("[data-aksrt-product-form]");
  var messageEl = editor.querySelector("[data-aksrt-product-editor-message]");
  if (!form) return;

  function selectedMultiValues(select) {
    if (!select) return [];
    return Array.prototype.slice
      .call(select.options)
      .filter(function (option) { return option.selected; })
      .map(function (option) { return Number(option.value || 0); })
      .filter(Boolean);
  }

  function parseOptionsText(text) {
    var groups = [];
    String(text || "").split(String.fromCharCode(10)).forEach(function (line) {
      line = line.replace(/\r/g, "").trim();
      if (!line) return;
      var parts = line.split("|");
      if (parts.length < 2) return;
      var name = parts[0].trim();
      var values = [];
      parts.slice(1).join("|").split(",").forEach(function (chunk) {
        chunk = chunk.trim();
        if (!chunk) return;
        var segs = chunk.split(":");
        var label = (segs[0] || "").trim();
        if (!label) return;
        values.push({ label: label, price_change: Number(segs[1] || 0), image: "" });
      });
      if (name && values.length) {
        groups.push({ name: name, view_mode: "list", values: values });
      }
    });
    return groups;
  }

  form.addEventListener("submit", function (event) {
    event.preventDefault();

    var formData = new FormData(form);
    var productId = Number(editor.getAttribute("data-product-id") || 0);
    var gallery = String(formData.get("gallery") || "")
      .split(String.fromCharCode(10))
      .map(function (line) { return line.replace(/\r/g, "").trim(); })
      .filter(Boolean);

    var payload = {
      title: String(formData.get("title") || "").trim(),
      price: Number(formData.get("price") || 0),
      stock: Number(formData.get("stock") || 0),
      excerpt: String(formData.get("excerpt") || ""),
      content: String(formData.get("content") || ""),
      status: String(formData.get("status") || "draft"),
      categories: selectedMultiValues(form.querySelector('select[name="categories[]"]')),
      tags: String(formData.get("tags") || "")
        .split(",")
        .map(function (tag) { return tag.trim(); })
        .filter(Boolean),
      image: String(formData.get("image") || "").trim(),
      gallery: gallery,
      shipping_mode: String(formData.get("shipping_mode") || "express"),
      shipping_fee: Number(formData.get("shipping_fee") || 0),
      after_sale_policy: String(formData.get("after_sale_policy") || ""),
      support_refund: formData.get("support_refund") === "1",
      options: parseOptionsText(formData.get("options_text") || ""),
      start_price: Number(formData.get("start_price") || 0),
      pay_modo: String(formData.get("pay_modo") || "0"),
      product_params: String(formData.get("product_params") || ""),
      product_video: String(formData.get("product_video") || "")
        .split(String.fromCharCode(10))
        .map(function (line) { return line.replace(/\r/g, "").trim(); })
        .filter(Boolean)
    };

    var path = productId > 0 ? "/shop/frontend/products/" + productId : "/shop/frontend/products";
    if (messageEl) messageEl.textContent = "正在保存商品...";

    rest(path, "POST", payload)
      .then(function (result) {
        if (!result.success) {
          if (messageEl) messageEl.textContent = result.message || "保存失败。";
          return;
        }
        var centerUrl = aksrtData.userCenterUrl || "/";
        if (messageEl) messageEl.textContent = "商品已保存，正在返回用户中心...";
        window.location.href = centerUrl;
      })
      .catch(function () {
        if (messageEl) messageEl.textContent = "网络错误，请稍后重试。";
      });
  });
})();