/**
     * 获取区域树结构
     */
    @GetMapping("/areaTree")
    public AjaxResult areaTree() throws Exception {
        return success(areaService.selectAreaAllTree());
    }
	
	/**
     * 获取完整区域树结构
     * @return
     */
    List<TreeSelectNew> selectAreaAllTree();
	
	/**
     * 构建完整的树形结构
     */
    public List<SysArea> buildAreaTree(List<SysArea> allAreas) {
        // 创建 parentId -> 子节点列表 映射
        Map<Long, List<SysArea>> childrenMap = new HashMap<>();
        allAreas.forEach(area -> {
            childrenMap.computeIfAbsent(area.getParentId(), k -> new ArrayList<>()).add(area);
        });

        // 筛选顶层节点
        return allAreas.stream()
                .filter(area -> area.getParentId() == null || area.getParentId() <= 0)
                .peek(area -> area.setChildren(getChildren(area.getDeptId(), childrenMap)))
                .collect(Collectors.toList());
    }

    /**
     * 递归获取子节点
     */
    private List<SysArea> getChildren(Long parentId, Map<Long, List<SysArea>> childrenMap) {
        List<SysArea> children = childrenMap.getOrDefault(parentId, new ArrayList<>());
        children.forEach(child -> child.setChildren(getChildren(child.getDeptId(), childrenMap)));
        return children;
    }

    /**
     * 获取完整区域树结构
     */
    @Override
    public List<TreeSelectNew> selectAreaAllTree() {
        // 获取所有区域信息
        List<SysArea> allAreas = sysAreaMapper.selectAreaAllTree();

        // 获取完整树结构
        List<SysArea> fullTree = buildAreaTree(allAreas);

        return fullTree.stream()
                .map(TreeSelectNew::new)
                .collect(Collectors.toList());

    }
	
	/**
     * 获取全部区域数据
     * @return
     */
    List<SysArea> selectAreaAllTree();
	
	<select id="selectAreaAllTree" resultMap="SysAreaResult">
        SELECT
        dept_id ,
        dept_code,
        parent_id,
        ancestors,
        dept_name ,
        types,
        levels
        FROM
        sys_area
        <where>
            del_flag = 0
            AND `status` = 0
        </where>
    </select>