using JiShe.CollectBus.Common.Enums;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using JiShe.CollectBus.Common.Models;
using System.Runtime.CompilerServices;

namespace JiShe.CollectBus.Common.Extensions
{
    public static class HexStringExtensions
    {
        //起始字符
        private const string startStr = "68";
        //结束字符
        private const string endStr = "16";
        //头部字节长度
        private const int hearderLen = 6;
        //消息认证码字段长度
        private const int pWLen = 16;

        private const int tPLen = 6;

        private const int FixedLength = 18;


        public static object GetAnalyzeValue(this List<string> hexStringList, CommandChunkEnum chunk) 
        {
            if (hexStringList.Count < hearderLen || hexStringList[0] != startStr || hexStringList[5] != startStr || hexStringList.Count < FixedLength)
            {
                return null;
            }

            switch (chunk)
            {              
                case CommandChunkEnum.AFN:
                    var aFn = hexStringList[(int)CommandChunkEnum.AFN].HexToDec();//1字节
                    return aFn;
                case CommandChunkEnum.FN:
                    //(DT2*8)+DT1=fn
                    var dt1Bin = hexStringList[(int)CommandChunkEnum.FN - 1].HexToBin();
                    var dt1 = dt1Bin != "0" ? dt1Bin.Length : 0;
                    var dt2 = hexStringList[(int)CommandChunkEnum.FN].HexToDec();
                    var fn = dt2 * 8 + dt1;
                    return fn;
                case CommandChunkEnum.A:
                    var aHexList = hexStringList.Skip((int)CommandChunkEnum.A).Take(5).ToList();
                    var a1 = aHexList[1] + aHexList[0];
                    var a2 = aHexList[3] + aHexList[2];
                    var a2Dec = a2.HexToDec();
                    var a3 = aHexList[4];
                    var a = $"{a1}{a2Dec.ToString().PadLeft(5, '0')}";
                    var a3Bin = aHexList[4].HexToBin().PadLeft(8, '0');
                    var msa = a3Bin.Substring(0, 7).BinToDec();
                    return new Tuple<string,int>(a, msa);
                case CommandChunkEnum.SEQ:
                    var seq = hexStringList[(int)CommandChunkEnum.SEQ].HexToBin().PadLeft(8, '0');
                    var tpV = (TpV)Convert.ToInt32(seq.Substring(0, 1));
                    var firfin = (FIRFIN)Convert.ToInt32(seq.Substring(1, 2));
                    var con = (CON)Convert.ToInt32(seq.Substring(3, 1));
                    var prseqBin = seq.Substring(4, 4);
                    return new Seq
                    {
                        CON = con,
                        FIRFIN = firfin,
                        PRSEQ = prseqBin.BinToDec(),
                        TpV = tpV
                    };
                case CommandChunkEnum.Data:
                    var lenIndex = (int)CommandChunkEnum.Len;
                    var lenBin = (hexStringList[lenIndex + 1]+hexStringList[lenIndex]).HexToBin();                  
                    var len = lenBin.Remove(lenBin.Length - 2).BinToDec();
                    var dataHexList = hexStringList.Skip(FixedLength).Take(len + hearderLen - FixedLength).ToList();
                    return dataHexList;
                default:
                    throw new ArgumentOutOfRangeException(nameof(chunk), chunk, null);
            }
        }


    }
}