using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Collections;
using System.Collections.Generic;
using XdCxRhDW.Dto;
using System.Security.Policy;
using System.Runtime.InteropServices;
using System.Text;

namespace CheckServer
{

    public static class CheckHelper
    {
        enum SigFlag : int
        {
            BPSK = 1,
            QPSK = 2
        }

        struct slot
        {
            public SigFlag sigflag;
            public int start;
            public int len;
            public SigMod mode;
            public double ps;//码元速率
        };
        enum SigMod : int
        {
            bp96_ccow = 0,
            bp96_01 = 1,
            bp96_02 = 2,
            bp96_03 = 3,
            bp96_04 = 4,

            bp192_01 = 5,
            bp192_02 = 6,
            bp192_03 = 7,
            qp16_01 = 8,
            qp16_02 = 9,
            qp16_03 = 10,
            qp16_04 = 11,
            qp16_05 = 12,
            qp16_06 = 13,
            qp16_07 = 14,
            qp16_08 = 15,
            qp16_09 = 16,
        }


        private const string dll = @"AddIns\PSignalCheck.dll";//张志明写的DAMA检测算法，根据特征码识别


        #region cpp dll Interop 
        [DllImport(dll, EntryPoint = "SigalEst", CallingConvention = CallingConvention.Cdecl)]
        private extern static void SigalEst(string file, long fsHz, int[] smpStart, int[] smpCount, int[] modes, double[] rates, double[] ffcs, double[] snrs, int len);

        [DllImport(dll, EntryPoint = "PSignalInit", CallingConvention = CallingConvention.Cdecl)]
        private static extern bool PSignalInit();

        [DllImport(dll, EntryPoint = "PSignalCheck", CallingConvention = CallingConvention.Cdecl)]
        private static extern int PSignalCheck(String ifile, Int64 fsample, double snr, ref IntPtr signalslots);

        [DllImport(dll, EntryPoint = "pSignalFree", CallingConvention = CallingConvention.Cdecl)]
        private static extern void pSignalFree(IntPtr ipt);
        #endregion
        public static async Task<IEnumerable<DmcResult>> DmcCheckAsync(string fileName, double fsHz, EnumSigCheckTypeDto dmcType, double? bandKHz = null)
        {
            if (bandKHz == null || bandKHz.Value <= 0) bandKHz = 25;
            string dmcCmd = "all";
            var dmp = new Process();
            string pFileName = Path.Combine(dmp.StartInfo.WorkingDirectory, "AddIns\\dmc.exe");
            string pArguments = string.Empty;
            switch (dmcType)
            {
                case EnumSigCheckTypeDto.DAMA:
                    dmcCmd = "dm";
                    if (fsHz != 96000)
                        throw new Exception("DAMA只支持96K采样率");
                    pArguments = $"{dmcCmd} \"{fileName}\" -c true";//-c包含ccow
                    break;
                case EnumSigCheckTypeDto.IBS:
                    dmcCmd = "nd";
                    pArguments = $"{dmcCmd} \"{fileName}\" -w {bandKHz}";// -f {fs}" -c --dmfirst";
                    break;
                case EnumSigCheckTypeDto.Ky5758:
                    pFileName = Path.Combine(dmp.StartInfo.WorkingDirectory, "AddIns\\enc.exe");
                    //enc.exe enc-test.dat 0.096 5 0全部文件
                    pArguments = $"{fileName} {fsHz * 1e-6} {5} {0}";
                    break;
                default:
                    break;
            }
            return await Task.Run(() =>
             {

                 dmp.StartInfo.FileName = pFileName;
                 dmp.StartInfo.Arguments = pArguments;
                 dmp.StartInfo.CreateNoWindow = true;
                 dmp.StartInfo.RedirectStandardError = true;
                 dmp.StartInfo.RedirectStandardOutput = true;
                 dmp.StartInfo.UseShellExecute = false;
                 StringBuilder sb = new StringBuilder();
                 dmp.OutputDataReceived += (sender, e) =>
                 {
                     sb.AppendLine(e.Data);
                 };
                 dmp.Start();
                 dmp.BeginOutputReadLine();
                 Stopwatch stopWatch = new Stopwatch();
                 stopWatch.Start();
                 dmp.WaitForExit();
                 stopWatch.Stop();
                 TimeSpan ts = stopWatch.Elapsed;
                 var str = sb.ToString();
                 return ConvertDmcResult(dmcType, str, ts.TotalMilliseconds);
             });
        }

        public static async Task<IEnumerable<DmcResult>> DAMACheckAsync(string fileName, double fsHz, EnumSigCheckTypeDto dmcType, double? bandKHz = null)
        {
            var val = await Task.Run(() =>
                   {
                       Stopwatch stopWatch = new Stopwatch();
                       stopWatch.Start();
                       IntPtr res = IntPtr.Zero;
                       PSignalInit();
                       int rcount = PSignalCheck(fileName, (long)fsHz, 18, ref res);
                       List<slot> rcontainer = new List<slot>();
                       for (int idx = 0; idx < rcount; ++idx)
                       {
                           IntPtr tmp = IntPtr.Add(res, idx * Marshal.SizeOf<slot>());
                           slot sl = Marshal.PtrToStructure<slot>(tmp);
                           rcontainer.Add(sl);
                       }

                       pSignalFree(res);
                       stopWatch.Stop();
                       return rcontainer.Select(t => new DmcResult()
                       {
                           DmcType = dmcType.GetEnumDisplayName(),
                           Length = t.len,
                           Start = t.start,
                           //UserName = t.mode.ToString(),
                           Times = (int)stopWatch.ElapsedMilliseconds,
                       });
                   });
            return val;
        }

        private static IEnumerable<DmcResult> ConvertDmcResult(EnumSigCheckTypeDto type, string res, double tm)
        {
            var lines = res.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);
            foreach (var line in lines)
            {
                var items = line.Split('\t');
                if (items.Length < 2) continue;
                int start = int.Parse(items[0]);
                int length = int.Parse(items[1]);
                string userName = "";
                if (items.Length >= 3)
                    userName = items[2];
                var item = new DmcResult(start, length, userName, (int)tm);
                item.DmcType = type.GetEnumDisplayName();
                yield return item;
            }
        }
    }
}