(function () {
  "use strict";

  async function api(url, body, method) {
    var res = await fetch(url, {
      method: method || "POST",
      headers: { "content-type": "application/json" },
      body: body === undefined ? undefined : JSON.stringify(body),
    });
    var json = null;
    try { json = await res.json(); } catch (e) {}
    if (!res.ok || (json && json.ok === false)) {
      if (res.status === 401) { location.href = "/login"; return new Promise(function () {}); }
      throw new Error((json && json.error && json.error.message) || "请求失败（" + res.status + "）");
    }
    return json;
  }

  function toast(msg) {
    var el = document.querySelector(".toast");
    if (!el) return;
    el.textContent = msg;
    el.classList.add("show");
    clearTimeout(el._t);
    el._t = setTimeout(function () { el.classList.remove("show"); }, 2600);
  }

  function refresh() {
    location.reload();
  }

  function esc(v) {
    return String(v == null ? "" : v).replace(/[&<>"']/g, function (c) {
      return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c];
    });
  }

  var SECTION_IDS = [
    "sec-content",
    "sec-tags",
    "sec-comments",
    "sec-contacts",
    "sec-sources",
    "sec-accounts",
  ];

  function activateSection(id, { syncNav } = { syncNav: true }) {
    if (!SECTION_IDS.includes(id)) return;
    document.querySelectorAll(".admin-main > section").forEach(function (s) {
      s.classList.toggle("active", s.id === id);
    });
    if (syncNav) {
      document.querySelectorAll(".admin-nav [data-section]").forEach(function (b) {
        b.setAttribute("aria-current", b.getAttribute("data-section") === id ? "true" : "false");
      });
    }
  }

  // 菜单项是真实链接：点击即向后台发起一次新的 /admin?section=… 请求，
  // 服务端重新查库渲染，因此每次切分区拿到的都是最新数据（无需手动刷新）。
  document.querySelectorAll(".admin-nav a[data-section]").forEach(function (link) {
    link.addEventListener("click", function (e) {
      // 普通左键点击交给浏览器完成整页跳转（= 重新拉数据）；
      // 中键 / Ctrl / Cmd 点击保留「新标签打开」的默认行为。
      if (e.metaKey || e.ctrlKey || e.shiftKey || e.altKey || e.button !== 0) return;
      activateSection(link.getAttribute("data-section"));
      document.querySelector(".admin-nav-refresh")?.setAttribute(
        "href",
        link.getAttribute("href")
      );
    });
  });

  // 兼容旧链接 /admin#sec-xxx：按 hash 切分区但不重新拉取
  (function restoreHashSection() {
    var hash = (location.hash || "").replace("#", "");
    if (hash && SECTION_IDS.includes(hash)) activateSection(hash);
  })();

  /* ============ 标签树：客户端渲染 + 拖拽调整层级 ============ */
  var tagRoot = document.getElementById("admin-tag-tree");
  var tagDraggingId = null;

  function tagRowHtml(n) {
    var kids = n.children && n.children.length;
    var label = kids
      ? '<button type="button" class="tree-row toggler" aria-expanded="true"><span class="tw">▶</span> <span class="name">' + esc(n.name) + "</span></button>"
      : '<span class="nameleaf"><span class="name">' + esc(n.name) + "</span></span>";
    return (
      "<li>" +
      '<div class="tree-row tag-node" draggable="true" data-id="' + n.id + '" data-drop-id="' + n.id + '">' +
        label +
        '<span class="mono cnt">' + n.count + " · #" + n.id + "</span>" +
        '<span class="row-actions" style="margin-left:8px">' +
          '<button class="btn btn-sm" type="button" data-action="tag-add" data-parent-id="' + n.id + '">+子级</button>' +
          '<button class="btn btn-sm" type="button" data-action="tag-rename" data-id="' + n.id + '" data-name="' + esc(n.name) + '">改名</button>' +
          '<button class="btn btn-sm" type="button" data-action="tag-move" data-id="' + n.id + '">移动</button>' +
          '<button class="btn btn-sm btn-danger" type="button" data-action="tag-delete" data-id="' + n.id + '">删</button>' +
        "</span>" +
      "</div>" +
      (kids ? '<ul class="tag-children open">' + n.children.map(tagRowHtml).join("") + "</ul>" : "") +
      "</li>"
    );
  }

  function renderTagAdminTree(tree) {
    if (!tagRoot) return;
    tagRoot.innerHTML = tree && tree.length
      ? '<ul class="tag-tree">' + tree.map(tagRowHtml).join("") + "</ul>"
      : '<p class="mono dim">还没有标签。</p>';
  }

  async function refreshTags() {
    if (!tagRoot) return;
    var json = await api("/api/tags/tree", undefined, "GET");
    renderTagAdminTree(json.data);
  }

  function clearTagDnd() {
    tagDraggingId = null;
    if (!tagRoot) return;
    tagRoot.classList.remove("drag-over");
    tagRoot.querySelectorAll(".drag-src,.drag-over").forEach(function (el) {
      el.classList.remove("drag-src", "drag-over");
    });
  }

  if (tagRoot) {
    if (Array.isArray(window.__ADMIN_TAG_TREE__)) renderTagAdminTree(window.__ADMIN_TAG_TREE__);
    else refreshTags();

    tagRoot.addEventListener("click", function (e) {
      var tog = e.target.closest(".toggler");
      if (!tog) return;
      var li = tog.closest("li");
      var ul = null;
      if (li) {
        for (var i = 0; i < li.children.length; i++) {
          if (li.children[i].tagName === "UL") ul = li.children[i];
        }
      }
      if (!ul) return;
      var open = ul.classList.toggle("open");
      tog.setAttribute("aria-expanded", open ? "true" : "false");
    });

    tagRoot.addEventListener("dragstart", function (e) {
      if (e.target.closest("button")) return;
      var row = e.target.closest(".tag-node");
      if (!row) return;
      tagDraggingId = row.getAttribute("data-id");
      e.dataTransfer.setData("text/plain", tagDraggingId);
      e.dataTransfer.effectAllowed = "move";
      row.classList.add("drag-src");
    });

    tagRoot.addEventListener("dragend", clearTagDnd);

    tagRoot.addEventListener("dragover", function (e) {
      if (!tagDraggingId) return;
      e.preventDefault();
      e.dataTransfer.dropEffect = "move";
      var row = e.target.closest(".tag-node[data-drop-id]");
      tagRoot.querySelectorAll(".drag-over").forEach(function (el) {
        el.classList.remove("drag-over");
      });
      if (row) row.classList.add("drag-over");
      else tagRoot.classList.add("drag-over");
    });

    tagRoot.addEventListener("dragleave", function (e) {
      if (e.target === tagRoot && !e.relatedTarget) tagRoot.classList.remove("drag-over");
    });

    tagRoot.addEventListener("drop", async function (e) {
      var id = tagDraggingId;
      var row = e.target.closest(".tag-node[data-drop-id]");
      var dropTarget = row ? row.getAttribute("data-drop-id") : null;
      clearTagDnd();
      if (!id || dropTarget === id) return;
      try {
        await api("/api/tags/" + id, { parentId: dropTarget ? Number(dropTarget) : null }, "PATCH");
        toast(dropTarget ? "已移动到目标标签下" : "已移回顶层");
        await refreshTags();
      } catch (err) {
        toast(err.message);
      }
    });
  }

  /* ============ 批量选择 / 批量状态 ============ */
  function selectedEntryIds() {
    var ids = [];
    document.querySelectorAll(".entry-check:checked").forEach(function (c) {
      ids.push(Number(c.getAttribute("data-id")));
    });
    return ids;
  }

  function updateBatchCount() {
    var el = document.getElementById("batch-count");
    if (el) el.textContent = "已选 " + selectedEntryIds().length + " 项";
  }

  document.addEventListener("change", function (e) {
    var ck = e.target;
    if (ck.classList && ck.classList.contains("entry-check-all")) {
      document.querySelectorAll(".entry-check").forEach(function (c) {
        c.checked = ck.checked;
      });
      updateBatchCount();
    } else if (ck.classList && ck.classList.contains("entry-check")) {
      updateBatchCount();
    }
  });

  document.addEventListener("click", async function (e) {
    var btn = e.target.closest("[data-action]");
    if (!btn) return;
    var action = btn.getAttribute("data-action");

    try {
      if (action === "tag-add") {
        var parentId = btn.getAttribute("data-parent-id");
        var name = prompt(parentId ? "新增子标签名称：" : "新增顶层标签组名称：");
        if (!name) return;
        await api("/api/tags", { name: name, parentId: parentId ? Number(parentId) : null });
        await refreshTags();
        toast("标签已创建");
      }

      if (action === "tag-rename") {
        var name2 = prompt("重命名为：", btn.getAttribute("data-name"));
        if (!name2 || name2 === btn.getAttribute("data-name")) return;
        await api("/api/tags/" + btn.getAttribute("data-id"), { name: name2 }, "PATCH");
        await refreshTags();
        toast("已重命名");
      }

      if (action === "tag-move") {
        var target3 = prompt("移动到哪个标签之下？填其 ID（留空移到顶层）：");
        if (target3 === null) return;
        await api("/api/tags/" + btn.getAttribute("data-id"),
          { parentId: target3.trim() ? Number(target3.trim()) : null }, "PATCH");
        await refreshTags();
        toast("已移动");
      }

      if (action === "tag-delete") {
        if (!confirm("删除该标签？其子标签将上移一级，关联关系解除。")) return;
        await api("/api/tags/" + btn.getAttribute("data-id"), undefined, "DELETE");
        await refreshTags();
        toast("已删除");
      }

      if (action === "entry-status") {
        await api("/api/entries/" + btn.getAttribute("data-id") + "/status",
          { status: btn.getAttribute("data-status") }, "PATCH");
        toast("状态已更新"); refresh();
      }

      if (action === "entry-delete") {
        if (!confirm("物理删除该条目？此操作不可恢复。")) return;
        await api("/api/entries/" + btn.getAttribute("data-id"), undefined, "DELETE");
        toast("已删除"); refresh();
      }

      if (action === "entry-select-all") {
        var checks = Array.prototype.slice.call(document.querySelectorAll(".entry-check"));
        var allOn = checks.length > 0 && checks.every(function (c) { return c.checked; });
        checks.forEach(function (c) { c.checked = !allOn; });
        var allEl = document.querySelector(".entry-check-all");
        if (allEl) allEl.checked = !allOn;
        updateBatchCount();
      }

      if (action === "entry-batch") {
        var ids = selectedEntryIds();
        if (!ids.length) { toast("请先勾选条目"); return; }
        var status = btn.getAttribute("data-status");
        await api("/api/admin/entries/status", { ids: ids, status: status }, "POST");
        toast(status === "active" ? "已上架 " + ids.length + " 条" : "已灰掉 " + ids.length + " 条");
        refresh();
      }

      if (action === "comment-delete") {
        if (!confirm("删除该评论？")) return;
        await api("/api/comments/" + btn.getAttribute("data-id"), undefined, "DELETE");
        toast("已删除"); refresh();
      }

      if (action === "contact-status") {
        var enabled = btn.getAttribute("data-enabled") === "1";
        if (enabled && !confirm("禁用后该联系方式将无法继续评论，确认？")) return;
        await api("/api/admin/contacts/" + btn.getAttribute("data-id") + "/status",
          { enabled: !enabled }, "PATCH");
        toast(enabled ? "已禁用" : "已启用"); refresh();
      }

      if (action === "contact-rename") {
        var nick = prompt("修改昵称：", btn.getAttribute("data-name"));
        if (!nick || nick === btn.getAttribute("data-name")) return;
        await api("/api/admin/contacts/" + btn.getAttribute("data-id"),
          { nickname: nick }, "PATCH");
        toast("昵称已更新"); refresh();
      }

      if (action === "contact-delete") {
        if (!confirm("删除该评论人员？其历史评论会保留。")) return;
        await api("/api/admin/contacts/" + btn.getAttribute("data-id"), undefined, "DELETE");
        toast("已删除"); refresh();
      }

      if (action === "relation-add") {
        var sel = document.getElementById("f-related");
        if (!sel || !sel.value) { toast("没有可关联的条目"); return; }
        var opt = sel.options[sel.selectedIndex];
        await api("/api/admin/entries/" + window.__ADMIN_ENTRY_ID__ + "/relations",
          { relatedId: Number(sel.value) }, "POST");
        toast("已关联：" + opt.textContent.trim().split(" · ")[0]);
        refresh();
      }

      if (action === "relation-remove") {
        if (!confirm("移除该关联？")) return;
        await api("/api/admin/entries/" + window.__ADMIN_ENTRY_ID__ +
          "/relations/" + btn.getAttribute("data-related-id"), undefined, "DELETE");
        toast("已移除关联"); refresh();
      }

      if (action === "user-disable") {
        var status = btn.getAttribute("data-status") === "active" ? "disabled" : "active";
        await api("/api/admin/users/" + btn.getAttribute("data-id") + "/status", { status: status }, "PATCH");
        toast("账号状态已更新"); refresh();
      }
    } catch (err) {
      toast(err.message);
    }
  });

  var userAddForm = document.getElementById("user-add-form");
  if (userAddForm) {
    userAddForm.addEventListener("submit", function (e) {
      e.preventDefault();
      api("/api/admin/users", {
        username: userAddForm.username.value.trim(),
        password: userAddForm.password.value,
        role: userAddForm.role.value,
      })
        .then(function () { toast("账号已创建"); refresh(); })
        .catch(function (err) { toast(err.message); });
    });
  }

  var aiKeyForm = document.getElementById("ai-key-form");
  if (aiKeyForm) {
    aiKeyForm.addEventListener("submit", function (e) {
      e.preventDefault();
      api("/api/admin/ai-key", { key: aiKeyForm.key.value.trim() }, "PUT")
        .then(function () { toast("AI 录入密钥已更新"); refresh(); })
        .catch(function (err) { toast(err.message); });
    });
  }

  document.querySelectorAll("form.source-config").forEach(function (form) {
    form.addEventListener("submit", function (e) {
      e.preventDefault();
      var id = form.getAttribute("data-id");
      api("/api/admin/sources/" + id, {
        name: form.name.value,
        url: form.url.value,
        adapter: form.adapter.value,
        cron_expr: form.cron_expr.value,
        enabled: form.enabled.checked,
      }, "PATCH")
        .then(function () { toast("内容源已保存"); refresh(); })
        .catch(function (err) { toast(err.message); });
    });
  });

  document.querySelectorAll("[data-source-run]").forEach(function (btn) {
    btn.addEventListener("click", async function () {
      var id = btn.getAttribute("data-source-run");
      btn.disabled = true;
      try {
        var json = await api("/api/admin/sources/" + id + "/run", {});
        var s = json.data;
        if (s.error) {
          toast("拉取失败：" + s.error);
        } else {
          toast("完成：发现 " + s.found + " · 新增 " + s.created + " · 跳过 " + s.skipped);
          refresh();
        }
      } catch (err) {
        toast(err.message);
      } finally {
        btn.disabled = false;
      }
    });
  });

  document.querySelectorAll("[data-source-runs]").forEach(function (btn) {
    btn.addEventListener("click", async function () {
      var box = document.getElementById("runs-" + btn.getAttribute("data-source-runs"));
      if (!box) return;
      if (!box.hidden) { box.hidden = true; return; }
      try {
        var json = await api("/api/admin/sources/" + btn.getAttribute("data-source-runs") + "/runs", undefined, "GET");
        box.textContent = JSON.stringify(json.data, null, 2).slice(0, 3000);
        box.hidden = false;
      } catch (err) {
        toast(err.message);
      }
    });
  });

  var sourceAddForm = document.getElementById("source-add-form");
  if (sourceAddForm) {
    sourceAddForm.addEventListener("submit", function (e) {
      e.preventDefault();
      api("/api/admin/sources", {
        name: sourceAddForm.name.value.trim(),
        url: sourceAddForm.url.value.trim(),
        adapter: sourceAddForm.adapter.value,
        cron_expr: sourceAddForm.cron_expr.value.trim(),
      })
        .then(function () { toast("拉取源已创建"); refresh(); })
        .catch(function (err) { toast(err.message); });
    });
  }
})();