using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using XdCxRhDW.Dto;

namespace GpuCgServer
{
    /// <summary>
    /// GPU参数估计帮助类
    /// </summary>
    public static class GpuCgHelper
    {
        private static string exePath = "AddIns";
        private const string exeName = "XcorrGpu.exe";
        /// <summary>
        /// 设置【ReSample.exe】文件所在路径,支持相对路径
        /// </summary>
        public static void SetExePath(string path)
        {
            if (string.IsNullOrWhiteSpace(path)) return;
            if (path.StartsWith("\\"))//相对路径要么开头不带\,要么是 .\
                path = path.Remove(0, 1);
            exePath = path;
        }
        /// <summary>
        /// GPU参估计算
        /// </summary>
        /// <param name="file1">输入文件1</param>
        /// <param name="file2">输入文件2</param>
        /// <param name="fsHz">采样率Hz</param>
        /// <param name="smpCount">样点数,0-1之间的小数表示样点百分比</param>
        /// <param name="dtoCenterus">时差中心(us)</param>
        /// <param name="dtoRangeus">时差范围(us)</param>
        /// <param name="dfoRange">频差范围(Hz)</param>
        /// <param name="snr0">信噪比门限</param>
        /// <param name="timeoutSeconds">超时时间(s)</param>
        /// <returns></returns>
        public static List<GpuCgResponseDto> Calc(string file1, string file2, double fsHz, double smpCount,
            double dtoCenterus, double dtoRangeus, double dfoRange, double snr0, int timeoutSeconds = 120)
        {
            if (timeoutSeconds <= 0) timeoutSeconds = 120;
            FileInfo f1 = new FileInfo(file1);
            FileInfo f2 = new FileInfo(file2);
            long len = f1.Length <= f2.Length ? f1.Length / 4 : f2.Length / 4;
            if (smpCount <= 0 || smpCount > len)
                smpCount = len;
            if (smpCount > 0 && smpCount < 1)
            {
                smpCount = (long)(len * smpCount);
            }
            if (string.IsNullOrWhiteSpace(exePath))
                throw new Exception($"请先调用SetExePath指定{exeName}进程所在路径,支持相对路径");
            if (!Directory.Exists(exePath))
                throw new Exception($"路径[{exePath}]不存在");
            var exeFile = Path.Combine(exePath, exeName);
            if (!File.Exists(exeFile))
                throw new Exception($"文件[{exeFile}]不存在");
            
            Process p = new Process();
            p.StartInfo.WorkingDirectory = exePath;
            p.StartInfo.FileName = exeFile;
            p.StartInfo.Arguments = $"-m \"{file1}\" -a \"{file2}\" -s {smpCount} -f {fsHz} -c {dtoCenterus} -r {dtoRangeus} -j {dfoRange} -t {snr0} -p {0}";
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.UseShellExecute = false;
            Stopwatch sw = new Stopwatch();
            sw.Start();
            p.Start();
            var succeed = p.WaitForExit(timeoutSeconds * 1000);
            if (!succeed)
            {
                throw new Exception($"进程[{exeName}]超时未完成!");
            }
            var res = p.StandardOutput.ReadToEnd();
            sw.Stop();
            if (sw.ElapsedMilliseconds < 800)
            {
                throw new Exception("没有GPU");
            }
            List<GpuCgResponseDto> list = new List<GpuCgResponseDto>();
            //3:-0.000*-0.00054.553+72.917*0.000*37.756+-72.917*0.000*37.671+
            if (res.Length < 3)
            {
                list.Add(new GpuCgResponseDto()
                {
                     Smplen=(long)smpCount,
                     TimeMs=(int)sw.ElapsedMilliseconds,
                });
                return list;
            }
            else
            {
                var xgfArr = res.Substring(2).Split("+".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                foreach (var item in xgfArr)
                {

                    var dtdfArr = item.Split("*".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    double.TryParse(dtdfArr[0], out double dt);
                    double.TryParse(dtdfArr[1], out double df);
                    double.TryParse(dtdfArr[2], out double snr);
                    dt = Math.Round(dt, 4);
                    df = Math.Round(df, 3);
                    snr = Math.Round(snr, 1);
                    GpuCgResponseDto dto = new GpuCgResponseDto()
                    {
                        Dt = dt,
                        Df = df,
                        Smplen = (long)smpCount,
                        Snr = snr,
                        TimeMs = (int)sw.ElapsedMilliseconds
                    };
                    list.Add(dto);

                }
                return list;
            }
        }

    }
}