/**
 * Product archive — sort + AJAX load more.
 *
 * @package AKSRT
 */
(function () {
  "use strict";

  var root = document.querySelector("[data-aksrt-product-archive]");
  if (!root) return;

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

  function toast(msg) {
    if (typeof window.aksrtToast === "function") {
      window.aksrtToast(msg);
      return;
    }
    if (window.console) console.log(msg);
  }

  var grid = root.querySelector("[data-aksrt-product-grid], #aksrt-product-grid");
  var countEl = root.querySelector("[data-aksrt-archive-count]");
  var loadMoreBtn = root.querySelector("[data-aksrt-shop-load-more]");
  var state = {
    taxonomy: root.getAttribute("data-taxonomy") || "",
    termId: Number(root.getAttribute("data-term-id") || 0),
    orderby: root.getAttribute("data-orderby") || "date",
    page: Number(root.getAttribute("data-page") || 1),
    maxPages: Number(root.getAttribute("data-max-pages") || 1),
    paging: root.getAttribute("data-paging") || "number",
    ias: root.getAttribute("data-ias") === "1",
    iasMax: Number(root.getAttribute("data-ias-max") || 5),
    loading: false,
    autoLoads: 0,
  };

  function fetchArchive(page, orderby, replace) {
    if (state.loading) return Promise.resolve();
    state.loading = true;
    if (loadMoreBtn) {
      loadMoreBtn.disabled = true;
      loadMoreBtn.textContent = "加载中...";
    }

    var qs = new URLSearchParams();
    qs.set("taxonomy", state.taxonomy);
    qs.set("term_id", String(state.termId));
    qs.set("page", String(page));
    qs.set("orderby", orderby || state.orderby);

    return fetch(restBase() + "/shop/frontend/products/archive?" + qs.toString(), {
      method: "GET",
      credentials: "same-origin",
      headers: {
        "X-WP-Nonce": (window.aksrtData && aksrtData.restNonce) || "",
      },
    })
      .then(function (r) { return r.json(); })
      .then(function (result) {
        state.loading = false;
        if (!result || !result.success || !result.data) {
          toast((result && result.message) || "加载失败");
          if (loadMoreBtn) {
            loadMoreBtn.disabled = false;
            loadMoreBtn.textContent = "加载更多";
          }
          return;
        }
        var data = result.data;
        state.page = Number(data.page || page);
        state.maxPages = Number(data.max_pages || 1);
        state.orderby = data.orderby || state.orderby;
        root.setAttribute("data-page", String(state.page));
        root.setAttribute("data-max-pages", String(state.maxPages));
        root.setAttribute("data-orderby", state.orderby);

        if (countEl && typeof data.total !== "undefined") {
          countEl.textContent = "共 " + data.total + " 件商品";
        }

        if (grid) {
          if (replace) {
            grid.innerHTML = data.html || "";
          } else if (data.html) {
            grid.insertAdjacentHTML("beforeend", data.html);
          }
        }

        root.querySelectorAll("[data-aksrt-shop-orderby]").forEach(function (a) {
          a.classList.toggle("is-active", a.getAttribute("data-aksrt-shop-orderby") === state.orderby);
        });

        if (loadMoreBtn) {
          var hasMore = state.page < state.maxPages;
          loadMoreBtn.style.display = hasMore ? "" : "none";
          loadMoreBtn.disabled = false;
          loadMoreBtn.textContent = "加载更多";
        }
      })
      .catch(function () {
        state.loading = false;
        if (loadMoreBtn) {
          loadMoreBtn.disabled = false;
          loadMoreBtn.textContent = "加载更多";
        }
        toast("网络错误");
      });
  }

  root.addEventListener("click", function (e) {
    var sort = e.target.closest("[data-aksrt-shop-orderby]");
    if (sort && root.contains(sort)) {
      e.preventDefault();
      var orderby = sort.getAttribute("data-aksrt-shop-orderby") || "date";
      if (orderby === state.orderby && state.paging === "ajax") return;
      state.orderby = orderby;
      state.autoLoads = 0;
      try {
        var u = new URL(window.location.href);
        u.searchParams.set("shop_orderby", orderby);
        u.searchParams.delete("paged");
        window.history.replaceState({}, "", u.toString());
      } catch (err) {}
      fetchArchive(1, orderby, true);
      return;
    }

    var more = e.target.closest("[data-aksrt-shop-load-more]");
    if (more && root.contains(more)) {
      e.preventDefault();
      if (state.page >= state.maxPages) return;
      fetchArchive(state.page + 1, state.orderby, false);
    }
  });

  if (state.paging === "ajax" && state.ias && "IntersectionObserver" in window && loadMoreBtn) {
    var io = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (!entry.isIntersecting) return;
        if (state.loading || state.page >= state.maxPages) return;
        if (state.iasMax > 0 && state.autoLoads >= state.iasMax) return;
        state.autoLoads += 1;
        fetchArchive(state.page + 1, state.orderby, false);
      });
    }, { rootMargin: "240px" });
    io.observe(loadMoreBtn);
  }
})();