using CliWrap;
using CliWrap.Buffered;
using Ips.Library.Entity;
using System.Diagnostics;

namespace Ips.Tpdx
{
    public class TpdxUtil
    {
        static readonly string CliFile = Path.Combine(IpsPath.CliRootDir, "tpdx", "defruiter.exe");

        public static async Task<string> ExecAsync(string fileIn, string outDir, DxSigItem item, bool useGpu = false, CancellationToken token = default)
        {
            string ofile = Path.Combine(outDir, Path.GetFileNameWithoutExtension(fileIn) + "_tpdx.dat");
            await Task.Run(() =>
            {
                //Int64 fsample = 6250000;
                //double bandwidth = 2000000; //Hz
                //double fc = 0; //Hz 干扰-信号
                //int Mod = (int)SignalMod._BPSK;
                double ps = -1;
                int order = 20;
                int proCount = 1;
                dxfun(proCount, order, fileIn, ofile, item.Fs, item.Bandwidth, item.Fc, ps, item.Mod);
            });
            return ofile;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="proCount">进程数</param>
        /// <param name="order">单次处理样点数  默认 20==1M</param>
        /// <param name="ifile">输入文件</param>
        /// <param name="ofile">输出文件</param>
        /// <param name="fsample">采样率</param>
        /// <param name="bandwidth">带宽  Hz</param>
        /// <param name="fc">频偏移 Hz</param>
        /// <param name="mod">模式</param>
        private static void dxfun(int proCount, int order, String ifile, String ofile, Int64 fsample, double bandwidth, double fc, double ps, int mod)
        {
            int len = 1 << order;
            int firlen = 1 << (order - 5);
            FileInfo fi = new FileInfo(ifile);
            Int64 total = fi.Length / 4;            // 总样点数
            int oversmpl = 40000;                   // 进程之间重复的点数

            int minSeg = 5;
            //可分小段的总数
            int totalSeg = (int)Math.Ceiling((total - len) * 1.0 / (len - firlen)) + 1;

            int maxProcCount = (int)(totalSeg / minSeg);
            if (proCount > maxProcCount) proCount = maxProcCount;

            int realSeg = (int)Math.Ceiling(totalSeg * 1.0 / proCount);
            int oneSmpCount = len;
            if (realSeg > 1)
            {
                oneSmpCount += ((realSeg - 1) * (len - firlen));
            }
            int woneSmpCount = oneSmpCount;

            Int64 pos = 0;
            List<Process> lps = new List<Process>();

            for (int idx = 0; idx < proCount; ++idx)
            {
                if (idx > 0)
                {
                    pos = idx * (oneSmpCount - oversmpl);
                }
                if (idx == proCount - 1)
                {
                    oneSmpCount = (int)(total - pos);
                }
                lps.Add(proc(ifile, ofile, fsample, fc, bandwidth, ps, mod, order, pos, oneSmpCount));
            }

            pos = 0;
            using (BinaryWriter binwriter = new BinaryWriter(File.Open(ofile, FileMode.Create)))
            {
                for (int idx = 0; idx < proCount; ++idx)
                {
                    if (idx > 0)
                    {
                        pos = idx * (woneSmpCount - oversmpl);
                    }
                    if (idx == proCount - 1)
                    {
                        woneSmpCount = (int)(total - pos);
                    }

                    var tfile = $@"{ofile}_{pos}_{woneSmpCount}.~def";
                    lps[idx].WaitForExit();
                    using (BinaryReader binReader = new BinaryReader(File.OpenRead(tfile)))
                    {
                        if (idx != 0)
                        {
                            binReader.BaseStream.Seek(oversmpl * 4, SeekOrigin.Begin);
                        }
                        while (true)
                        {
                            var buff = binReader.ReadBytes(1024 * 1024 * 4);
                            if (buff == null || buff.Length <= 0)
                            {
                                break;
                            }
                            binwriter.Write(buff, 0, buff.Length);
                        }
                    }
                    File.Delete(tfile);
                    Console.WriteLine($"{tfile}  finish");
                }
            }
            Console.WriteLine($"finish");
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="ifile">输入文件</param>
        /// <param name="ofile">输出文件</param>
        /// <param name="fs">采样率</param>
        /// <param name="fc">频偏移</param>
        /// <param name="bw">带宽</param>
        /// <param name="mod">模式</param>
        /// <param name="order">单次处理样点数  默认 20==1M</param>
        /// <param name="pos">开始位置</param>
        /// <param name="len">长度</param>
        /// <returns></returns>
        private static Process proc(String ifile, String ofile, Int64 fs, double fc, double bw, double ps, int mod, int order, Int64 pos, Int64 len)
        {
            Process pro = new Process();
            pro.StartInfo.CreateNoWindow = true;
            pro.StartInfo.UseShellExecute = false;
            pro.StartInfo.WorkingDirectory = Path.GetDirectoryName(CliFile);
            pro.StartInfo.FileName = CliFile;
            pro.StartInfo.Arguments = $"\"{ifile}\" \"{ofile}\" {fs} {fc} {bw} {ps} {mod} {order} {pos} {len}";
            Console.WriteLine(pro.StartInfo.Arguments);
            pro.Start();
            return pro;
        }

    }
}