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

namespace X3TaskServer54
{
    static class DDCHelper
    {
        private static string exePath = "AddIns\\DDC";
        private const string exeName = "DigitaDownConverter.exe";
        /// <summary>
        /// 设置【DigitaDownConverter.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>
        /// 对多个频点信号的AD文件做DDC
        /// </summary>
        /// <param name="file">输入文件</param>
        /// <param name="adTime">采集时刻</param>
        /// <param name="chNo">通道号0-3</param>
        /// <param name="fsHz">输入文件采样率Hz</param>
        /// <param name="freqCenterHz">中心频率Hz</param>
        /// <param name="outDir">输出目录</param>
        /// <param name="sigs">DDC信号参数</param>
        /// <param name="timeoutSeconds">超时时间(秒)</param>
        /// <returns>成功后返回DDC输出的文件</returns>
        public static List<string> DDC(string file, DateTime adTime, int chNo, long fsHz, long freqCenterHz,
            string outDir, IEnumerable<DDCSig> sigs, int timeoutSeconds = 60)
        {
            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($"文件[{exeFile}]不存在");
            Process p = new Process();
            p.StartInfo.WorkingDirectory = exePath;
            p.StartInfo.FileName = exeFile;
            StringBuilder sb = new StringBuilder();
            sb.Append($"\"{file}\" \"{outDir}\" {adTime:yyyyMMddHHmmss} {chNo} {fsHz} {freqCenterHz} {sigs.Count()}");
            List<string> list = new List<string>();
            foreach (var sig in sigs)
            {
                sb.Append(" ").Append(sig.FreqDownHz).Append(" ").Append(sig.Mult);
                list.Add(Path.Combine(outDir, $"{adTime:yyyyMMddHHmmss}_{sig.FreqDownHz / 1e6:f3}_C{fsHz / sig.Mult}_CH{chNo}.dat"));
            }
            p.StartInfo.Arguments = sb.ToString();
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.UseShellExecute = false;
            p.Start();
            var succeed = p.WaitForExit(timeoutSeconds * 1000);
            if (!succeed)
            {
                throw new Exception($"进程[{exeName}]超时未完成!");
            }
            return list.Where(x => File.Exists(x)).ToList();
        }
    }
    class DDCSig
    {
        /// <summary>
        /// 信号下行频点Hz
        /// </summary>
        public int FreqDownHz { get; set; }

        /// <summary>
        /// 抽取倍数
        /// </summary>
        public int Mult { get; set; }

        public SlotsInfo Slots { get; set; }
    }
}