using SqlSugar;
using ZR.Model.System;

namespace ZR.Service.Business
{
    /// <summary>
    /// 部门数据隔离工具类
    /// 根据 DeptId 递归查询本级及所有下级部门 ID 列表
    /// </summary>
    public static class DeptDataScopeHelper
    {
        /// <summary>
        /// 获取当前用户可见的部门ID列表（本级 + 所有下级）
        /// </summary>
        /// <param name="db">SqlSugar 客户端实例</param>
        /// <param name="deptId">当前用户所属部门ID</param>
        /// <returns>可见部门ID列表</returns>
        public static List<long> GetVisibleDeptIds(ISqlSugarClient db, long deptId)
        {
            var allDepts = db.Queryable<SysDept>().ToList();
            var result = new List<long> { deptId };
            CollectChildDeptIds(allDepts, deptId, result);
            return result;
        }

        /// <summary>
        /// 递归收集所有下级部门ID
        /// </summary>
        private static void CollectChildDeptIds(List<SysDept> all, long parentId, List<long> result)
        {
            var children = all.Where(d => d.ParentId == parentId).ToList();
            foreach (var child in children)
            {
                result.Add(child.DeptId);
                CollectChildDeptIds(all, child.DeptId, result);
            }
        }
    }
}