using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using BatCharging.Model;

namespace BatCharging.Service
{
    /// <summary>
    /// 设备鉴权和操作指令消息封装类-3.3
    /// </summary>
    public class MsgSignCmdEncoder
    {

        /// <summary>
        /// 获取鉴权消息包字节列表
        /// </summary>
        /// <returns></returns>
        public byte[] GetMsgPackSignIn(byte[] destAddr,out Auth auth)
        {
            byte[] result = null;

            APCI headAPCI = new APCI();
            headAPCI.StartChar = CmnChargerConst.APCI_START_CHAR;
            headAPCI.PackLen = 0;  //临时赋值为零,具体数值看下面的计算结果
            headAPCI.CtlArea = 0;  //控制域
            headAPCI.DestAddr = destAddr;//目的地址
            headAPCI.SrcAddr = 0;//源地址，本系统中，源地址统一为：00000000（即为0）

            byte randomNum = CmnChargerParam.GetByteRandomNum();

            ASDU headASDU = new ASDU();
            headASDU.FrameTypeNo = 45;   //帧类型号
            headASDU.MsgBodyCount = 1;   //信息体个数
            headASDU.TransReason = 3;    //传送原因
            headASDU.PublicAddr = 0;     //公共地址
            headASDU.MsgBodyAddr = new byte[] { 0, 0, 0 };  //信息体地址

            auth = new Auth();
            auth.RecordType = 24;  //记录类型
            auth.ClientType = 1;   //客户端类型。1站控 2本地控制器 3测试客户端 4TCU模式 0未知设备
            auth.ConnSeq = CmnChargerParam.GetUInt16SeqNum();  //连接序号
            auth.AuthCodes = GetAuthCodesResult(CmnChargerConst.AUTH_CODE, randomNum);  //鉴权码
            auth.AuthCodeKey = randomNum;  //鉴码KEY[随机数]

            headASDU.MsgBodyContents = GetMsgContents(auth);          //信息体
            headAPCI.PackLen = Convert.ToUInt16(24 + headASDU.MsgBodyContents.Length);  //报文长度

            List<byte> lstResult = MsgHeadApciEncoder.BuildBaseAPCI(headAPCI);
            lstResult.AddRange(MsgHeadAsduEncoder.BuildBaseASDU(headASDU).ToArray());

            result = lstResult.ToArray();

            return result;
        }

        /// <summary>
        /// 获取到异或后的鉴权字节数组
        /// </summary>
        /// <param name="strAuthCodes">鉴权字符串</param>
        /// <returns>异或后的鉴权字节数组</returns>
        private byte[] GetAuthCodesResult(string strAuthCodes,byte key)
        {
            byte[] results = new byte[8];
            if (!String.IsNullOrEmpty(strAuthCodes))
            {
                byte[] authCodes = Encoding.ASCII.GetBytes(strAuthCodes);

                results[0] = Convert.ToByte(authCodes[0] ^ key);
                results[1] = Convert.ToByte(authCodes[1] ^ key);
                results[2] = Convert.ToByte(authCodes[2] ^ key);
                results[3] = Convert.ToByte(authCodes[3] ^ key);
                results[4] = Convert.ToByte(authCodes[4] ^ key);
                results[5] = Convert.ToByte(authCodes[5] ^ key);
                results[6] = Convert.ToByte(authCodes[6] ^ key);
                results[7] = Convert.ToByte(authCodes[7] ^ key);
            }
            return results;
        }

        /// <summary>
        /// 获取鉴权消息体字节数组
        /// </summary>
        /// <param name="auth"></param>
        /// <returns>鉴权消息体字节数组</returns>
        private byte[] GetMsgContents(Auth auth)
        {
            byte[] results = null;
            if (auth!=null)
            {
                List<byte> lstContent = new List<byte>();
                lstContent.Add(auth.RecordType);
                lstContent.Add(auth.ClientType);
                lstContent.AddRange(BitConverter.GetBytes(auth.ConnSeq));
                lstContent.AddRange(auth.AuthCodes);
                lstContent.Add(auth.AuthCodeKey);
                results = lstContent.ToArray();
            }
            return results;
        }



    }
}