import type { RouteRecordRaw } from 'vue-router';

import { computed } from 'vue';

import { useAccess } from '@vben/access';
import { useAccessStore } from '@vben/stores';

/** 首页常驻，业务数据和入口仍需遵循当前用户的菜单权限。 */
export function useHomeAccess() {
  const accessStore = useAccessStore();
  const { hasAccessByCodes } = useAccess();

  function canQuery(permission: string) {
    return hasAccessByCodes([permission, '*:*:*']);
  }

  function canNavigate(name: string) {
    function contains(routes: RouteRecordRaw[]): boolean {
      return routes.some((route) => {
        if (route.meta?.menuVisibleWithForbidden) return false;
        return route.name === name || contains(route.children ?? []);
      });
    }
    return contains(accessStore.accessRoutes);
  }

  /**
   * 该菜单对当前用户是否「开着」—— 用于首页模块开关。
   *
   * 后端菜单 `visible = 0` 会被前端转成路由的 `meta.hideInMenu`，这类路由仍然注册在
   * router 里（`canNavigate` 为 true，页面可以直接访问），只是整棵子树不会出现在侧边栏。
   * 所以判断「这个模块有没有开」不能只看路由是否存在，还要看它和它的每一级祖先是否可见。
   */
  function canSeeMenu(name: string) {
    function find(
      routes: RouteRecordRaw[],
      ancestorHidden: boolean,
    ): boolean | undefined {
      for (const route of routes) {
        const hidden =
          ancestorHidden ||
          route.meta?.hideInMenu === true ||
          route.meta?.menuVisibleWithForbidden === true;
        if (route.name === name) return !hidden;
        const found = find(route.children ?? [], hidden);
        if (found !== undefined) return found;
      }
      return undefined;
    }
    return find(accessStore.accessRoutes, false) === true;
  }

  const canViewHome = computed(() => canQuery('mes:home:query'));

  return { canNavigate, canQuery, canSeeMenu, canViewHome };
}