using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
using System.Web;
using System.Xml;
using System.Collections;
using QMAPP.Entity.Sys;

namespace QMAPP.Common.Web.Util
{
    /// <summary>
    ///  权限工具
    /// </summary>
    public class PowerUtil
    {
        /// <summary>
        /// 拥有的权限
        /// </summary>
        public List<PowerInfo> OwnPowers { get; set; }

        /// <summary>
        /// 拥有的角色
        /// </summary>
        public List<Role> OwnRoles { get; set; }

        #region 获取权限列表

        /// <summary>
        /// 获取权限信息
        /// </summary>
        /// <returns>权限信息</returns>
        public List<PowerInfo> GetPowerList(string powerFile)
        {
            List<PowerInfo> list = new List<PowerInfo>();
            try
            {
                //获取全部权限
                XElement xel = XElement.Load(powerFile);

                var datas = from x in xel.Descendants("PowerInfo")
                            select x;

                foreach (XElement d in datas)
                {
                    if (d.Attribute("Visible").Value.ToLower() == "false")
                    {
                        continue;
                    }

                    PowerInfo info = new PowerInfo();
                    info.PowerID = d.Attribute("PowerID").Value;
                    info.PowerDes = d.Attribute("PowerDes").Value;
                    info.PowerType = d.Attribute("PowerType").Value;
                    info.Seq = int.Parse(d.Attribute("Seq").Value);
                    info.SuperID = d.Attribute("SuperID").Value;
                    info.Selected = this.IsOwn(info.PowerID);

                    list.Add(info);
                }

                return list;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        #endregion

        #region 获取权限信息

        /// <summary>
        /// 获取权限信息
        /// </summary>
        /// <returns>权限信息</returns>
        public List<PowerInfo> GetAllPowerInfos(string powerFile)
        {
            List<PowerInfo> list = new List<PowerInfo>();
            List<PowerInfo> powers = new List<PowerInfo>();
            try
            {
                //获取全部权限
                list = this.GetPowerList(powerFile);

                //添加第一级权限
                var array = list.Where(i => i.SuperID == "");
                //添加第一级权限
                foreach (PowerInfo childPower in array)
                {
                    //添加这个子权限
                    this.BuildChildItems(childPower, list);

                    powers.Add(childPower);
                }
                return powers;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 创建子菜单项

        /// <summary>
        /// 创建子菜单项
        /// </summary>
        /// <param name="parentItem">父权限</param〉
        /// <param name="list">子权限</param>
        /// <summary>
        /// 创建权限单项
        /// </summary>
        /// <param name="parentItem">父权限</param〉
        /// <param name="list">子权限</param>
        private void BuildChildItems(PowerInfo parentItem, List<PowerInfo> list)
        {
            var array = list.Where(i => i.SuperID == parentItem.PowerID);

            parentItem.ChildPowers = new List<PowerInfo>();

            foreach (PowerInfo childPower in array)
            {
                //如果查询不到下级菜单就结束
                if (list.Where(i => i.SuperID == childPower.PowerID).Count() != 0)
                {
                    //添加子菜单
                    this.BuildChildItems(childPower, list);
                }

                parentItem.ChildPowers.Add(childPower);

            }
        }

        #endregion

        #region 判断是否拥有

        /// <summary>
        /// 判断是否拥有
        /// </summary>
        /// <param name="powerID">权限主键</param>
        /// <returns>true:拥有;false:不拥有</returns>
        private bool IsOwn(string powerID)
        {
            bool flag = false;

            if (this.OwnPowers == null)
                return flag;

            flag = this.OwnPowers.Exists(p => p.PowerID == powerID);

            return flag;
        }

        #endregion

    }
}