import editForm from "../form.vue";
import { handleTree } from "@/utils/tree";
import { message } from "@/utils/message";
import { getMenuList, createMenu, updateMenu, deleteMenuApi, updateMenuSort } from "@/api/system";
import { getAsyncRoutes } from "@/api/routes";
import { usePermissionStoreHook } from "@/store/modules/permission";
import { transformI18n } from "@/plugins/i18n";
import { addDialog } from "@/components/ReDialog";
import { reactive, ref, onMounted, h, nextTick } from "vue";
import type { FormItemProps } from "../utils/types";
import { useRenderIcon } from "@/components/ReIcon/src/hooks";
import { cloneDeep, isAllEmpty, deviceDetection } from "@pureadmin/utils";
import { initRouter } from "@/router/utils";
import { emitter } from "@/utils/mitt";
import Sortable from "sortablejs";

export function useMenu() {
  const form = reactive({
    title: ""
  });

  const formRef = ref();
  const dataList = ref([]);
  const loading = ref(true);
  const flatDataMap = ref(new Map<string | number, any>());
  const flatOrderedList = ref<any[]>([]);
  let sortableInstance: Sortable | null = null;
  let draggedDataCache: any = null;

  /** 深度优先遍历树，返回与 DOM 行顺序一致的扁平列表 */
  function buildFlatOrdered(tree: any[]): any[] {
    const result: any[] = [];
    function walk(nodes: any[]) {
      for (const node of nodes) {
        result.push(node);
        if (node.children?.length > 0) {
          walk(node.children);
        }
      }
    }
    walk(tree);
    return result;
  }

  /** 给表格每行打上 data-id 属性，供拖拽时识别菜单 */
  function tagRowIds(tableEl: HTMLElement) {
    const rows = tableEl.querySelectorAll(".el-table__body-wrapper .el-table__row");
    const list = flatOrderedList.value;
    for (let i = 0; i < rows.length; i++) {
      if (i < list.length) {
        rows[i].setAttribute("data-id", String(list[i].id));
      }
    }
  }

  const getMenuType = (type, text = false) => {
    switch (type) {
      case 0:
        return text ? "菜单" : "primary";
      case 1:
        return text ? "iframe" : "warning";
      case 2:
        return text ? "外链" : "danger";
      case 3:
        return text ? "按钮" : "info";
    }
  };

  const columns: TableColumnList = [
    {
      label: "菜单名称",
      prop: "title",
      align: "left",
      cellRenderer: ({ row }) => (
        <>
          <span class="drag-handle inline-flex align-middle mr-1" style="cursor: grab; color: #909399; user-select: none; vertical-align: middle;">
            <svg width="12" height="16" viewBox="0 0 12 16" fill="currentColor">
              <circle cx="4" cy="3" r="1.2"/>
              <circle cx="8" cy="3" r="1.2"/>
              <circle cx="4" cy="8" r="1.2"/>
              <circle cx="8" cy="8" r="1.2"/>
              <circle cx="4" cy="13" r="1.2"/>
              <circle cx="8" cy="13" r="1.2"/>
            </svg>
          </span>
          <span class="inline-block mr-1">
            {h(useRenderIcon(row.icon), {
              style: { paddingTop: "1px" }
            })}
          </span>
          <span>{transformI18n(row.title)}</span>
        </>
      )
    },
    {
      label: "菜单类型",
      prop: "menuType",
      width: 100,
      cellRenderer: ({ row, props }) => (
        <el-tag
          size={props.size}
          type={getMenuType(row.menuType)}
          effect="plain"
        >
          {getMenuType(row.menuType, true)}
        </el-tag>
      )
    },
    {
      label: "路由路径",
      prop: "path"
    },
    {
      label: "组件路径",
      prop: "component",
      formatter: ({ path, component }) =>
        isAllEmpty(component) ? path : component
    },
    {
      label: "权限标识",
      prop: "auths"
    },
    {
      label: "排序",
      prop: "rank",
      width: 100
    },
    {
      label: "隐藏",
      prop: "showLink",
      formatter: ({ showLink }) => (showLink ? "否" : "是"),
      width: 100
    },
    {
      label: "操作",
      fixed: "right",
      width: 210,
      slot: "operation"
    }
  ];

  function handleSelectionChange(val) {
    console.log("handleSelectionChange", val);
  }

  function resetForm(formEl) {
    if (!formEl) return;
    formEl.resetFields();
    onSearch();
  }

  async function onSearch() {
    loading.value = true;
    const { data } = await getMenuList(); // 这里是返回一维数组结构，前端自行处理成树结构，返回格式要求：唯一id加父节点parentId，parentId取父节点id
    // 构建 id -> 菜单项 的扁平映射表，供拖拽排序时查询
    const map = new Map<string | number, any>();
    for (const item of data) {
      map.set(item.id, item);
    }
    flatDataMap.value = map;
    // 构建树并缓存深度优先扁平列表（与 DOM 行顺序一致）
    const fullTree = handleTree(data);
    flatOrderedList.value = buildFlatOrdered(fullTree);
    if (!isAllEmpty(form.title)) {
      // 前端搜索菜单名称：过滤扁平数据后重新构建树
      const filtered = data.filter(item =>
        transformI18n(item.title).includes(form.title)
      );
      dataList.value = handleTree(filtered);
    } else {
      dataList.value = fullTree;
    }
    setTimeout(() => {
      loading.value = false;
    }, 500);
  }

  function formatHigherMenuOptions(treeList) {
    if (!treeList || !treeList.length) return;
    const newTreeList = [];
    for (let i = 0; i < treeList.length; i++) {
      treeList[i].title = transformI18n(treeList[i].title);
      formatHigherMenuOptions(treeList[i].children);
      newTreeList.push(treeList[i]);
    }
    return newTreeList;
  }

  function openDialog(title = "新增", row?: FormItemProps) {
    addDialog({
      title: `${title}菜单`,
      props: {
        formInline: {
          id: row?.id,
          menuType: row?.menuType ?? 0,
          higherMenuOptions: formatHigherMenuOptions(cloneDeep(dataList.value)),
          parentId: row?.parentId ?? 0,
          title: row?.title ?? "",
          name: row?.name ?? "",
          path: row?.path ?? "",
          component: row?.component ?? "",
          rank: row?.rank ?? 99,
          redirect: row?.redirect ?? "",
          icon: row?.icon ?? "",
          extraIcon: row?.extraIcon ?? "",
          enterTransition: row?.enterTransition ?? "",
          leaveTransition: row?.leaveTransition ?? "",
          activePath: row?.activePath ?? "",
          auths: row?.auths ?? "",
          frameSrc: row?.frameSrc ?? "",
          frameLoading: row?.frameLoading ?? true,
          keepAlive: row?.keepAlive ?? false,
          hiddenTag: row?.hiddenTag ?? false,
          fixedTag: row?.fixedTag ?? false,
          showLink: row?.showLink ?? true,
          showParent: row?.showParent ?? false
        }
      },
      width: "45%",
      draggable: true,
      fullscreen: deviceDetection(),
      fullscreenIcon: true,
      closeOnClickModal: false,
      contentRenderer: () => h(editForm, { ref: formRef, formInline: null }),
      beforeSure: (done, { options }) => {
        const FormRef = formRef.value.getRef();
        const curData = options.props.formInline as FormItemProps;
        FormRef.validate(async valid => {
          if (valid) {
            try {
              if (title === "新增") {
                await createMenu(curData);
                message(`新增菜单「${transformI18n(curData.title)}」成功`, { type: "success" });
              } else {
                await updateMenu((curData as any).id, curData);
                message(`修改菜单「${transformI18n(curData.title)}」成功`, { type: "success" });
              }
              done();
              onSearch();
            } catch (error) {
              message("操作失败，请重试", { type: "error" });
            }
          }
        });
      }
    });
  }

  async function handleDelete(row) {
    try {
      await deleteMenuApi(row.id);
      message(`删除菜单「${transformI18n(row.title)}」成功`, { type: "success" });
      onSearch();
    } catch (error) {
      message("删除失败，请重试", { type: "error" });
    }
  }

  function initDragSort(tableEl: HTMLElement) {
    destroyDragSort();
    const tbody = tableEl.querySelector(".el-table__body-wrapper tbody") as HTMLElement;
    if (!tbody) return;

    // 给行打上 data-id 属性
    tagRowIds(tableEl);

    sortableInstance = Sortable.create(tbody, {
      handle: ".drag-handle",
      draggable: ".el-table__row",
      animation: 200,
      ghostClass: "sortable-ghost",
      onStart() {
        draggedDataCache = null;
      },
      onMove(evt) {
        const draggedId = evt.dragged.getAttribute("data-id");
        const relatedId = evt.related.getAttribute("data-id");
        const draggedData = flatDataMap.value.get(draggedId);
        const relatedData = flatDataMap.value.get(relatedId);
        if (!draggedData || !relatedData) return false;
        if (!draggedDataCache) draggedDataCache = draggedData;
        // 只允许同级拖拽
        return draggedData.parentId === relatedData.parentId;
      },
      async onEnd() {
        const draggedData = draggedDataCache;
        if (!draggedData) return;

        const parentId = draggedData.parentId;
        // 从 DOM 新顺序中收集同级兄弟的 id（data-id 在 DOM 移动后跟着走了）
        const allRows = tbody.querySelectorAll(".el-table__row");
        const siblingIds: any[] = [];
        for (const row of allRows) {
          const id = row.getAttribute("data-id");
          const data = flatDataMap.value.get(id);
          if (data && data.parentId === parentId && !siblingIds.includes(id)) {
            siblingIds.push(id);
          }
        }

        console.log("[menu-sort] draggedData.parentId:", parentId, "type:", typeof parentId);
        console.log("[menu-sort] siblingIds:", siblingIds, "count:", siblingIds.length);

        if (siblingIds.length <= 1) {
          console.log("[menu-sort] 同级兄弟不足2个，跳过排序");
          return;
        }

        const sortData = siblingIds.map((id, index) => ({
          id,
          rank: index + 1
        }));
        console.log("[menu-sort] sortData:", sortData);

        try {
          await updateMenuSort(sortData);
          message("排序更新成功", { type: "success" });
          // 刷新侧边栏路由顺序
          try {
            // 先直接查 API 返回的原始数据（含 children 中第一条的 title）
            const routesRes = await getAsyncRoutes();
            const apiRanks = (routesRes as any).data?.map((m: any) => {
              const child = m.children?.[0];
              return `${m.meta?.title}(${m.meta?.rank},${m.path})` + (child ? ` → ${child.meta?.title}(${child.meta?.rank},${child.path})` : '');
            });
            console.log("[menu-sort] API 原始:", apiRanks);

            await initRouter();
            await nextTick();
            const topMenus = usePermissionStoreHook().wholeMenus
              .map((m: any) => `${m.meta?.title || "?"}(${m.meta?.rank},${m.path})`);
            console.log("[menu-sort] store:", topMenus);

            emitter.emit("menuRefresh");
          } catch (e) {
            console.error("侧边栏路由刷新失败:", e);
          }
        } catch {
          message("排序更新失败", { type: "error" });
        }
        draggedDataCache = null;
        onSearch();
      }
    });
  }

  function destroyDragSort() {
    if (sortableInstance) {
      sortableInstance.destroy();
      sortableInstance = null;
    }
  }

  onMounted(() => {
    onSearch();
  });

  return {
    form,
    loading,
    columns,
    dataList,
    /** 搜索 */
    onSearch,
    /** 重置 */
    resetForm,
    /** 新增、修改菜单 */
    openDialog,
    /** 删除菜单 */
    handleDelete,
    handleSelectionChange,
    /** 初始化拖拽排序 */
    initDragSort,
    /** 销毁拖拽排序 */
    destroyDragSort
  };
}