using Dicom.IO;
using Dicom.Network;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Vinno.FIS.Sonopost.Common;
using Vinno.FIS.Sonopost.Features.Dicom;
using Vinno.FIS.Sonopost.Managers.Interfaces;
using Vinno.FIS.Sonopost.Settings;
using Vinno.IUS.Common.Log;

namespace Vinno.FIS.Sonopost.Managers
{
    internal class DicomServerManager : SonopostManager, IDicomServerManager
    {
        private readonly IRemedicalManager _remedicalManager;
        private IDicomServer _server;
        private bool _dicomEnabled;
        private string _dicomTitle;
        private int _dicomPort;
        private int _dicomTempFileDays;
        private bool _isRunning => _server?.IsListening ?? false;

        private ManualResetEvent _manualResetEvent = new ManualResetEvent(false);

        private CancellationTokenSource _tokenSource;

        private Task _task;

        public DicomServerManager()
        {
            _remedicalManager = AppManager.Instance.GetManager<IRemedicalManager>();
            TemporaryFile.StoragePath = Path.Combine(SonopostConstants.DataFolder, SonopostConstants.TempFiles);
            _dicomEnabled = SonopostUserDefinedSettings.Instance.DicomSetting.UseDicomService;
            _dicomTitle = SonopostUserDefinedSettings.Instance.DicomSetting.DicomTitile;
            _dicomPort = SonopostUserDefinedSettings.Instance.DicomSetting.DicomPort;
            _dicomTempFileDays = SonopostUserDefinedSettings.Instance.DicomSetting.TempFileDays;
            Start();
            CheckOverDueFile();
        }

        private void Start()
        {
            var port = SonopostUserDefinedSettings.Instance.DicomSetting.DicomPort;
            if (_dicomEnabled && !_isRunning)
            {
                _server = DicomServer.Create<VinnoDicomService>(port, logger: new DicomLog());
                if (_isRunning)
                {
                    Logger.WriteLineInfo("Dicom server started.");
                    _manualResetEvent.Reset();
                }
                else
                {
                    Logger.WriteLineWarn("Dicom server start failed.");
                }
            }
        }

        private void Stop()
        {
            if (_server != null)
            {
                _server.Stop();
                _server.Dispose();
                _server = null;
                Logger.WriteLineInfo("Dicom server Stoped.");
            }
            _tokenSource?.Cancel();
            _manualResetEvent.Set();
            try
            {
                _task?.Wait(1000);//因Task在Wait过程中Cancel有几率会出错
            }
            catch
            {
            }
        }

        public void ChangeValue()
        {
            var dicomEnabled = SonopostUserDefinedSettings.Instance.DicomSetting.UseDicomService;
            var dicomTitle = SonopostUserDefinedSettings.Instance.DicomSetting.DicomTitile;
            var dicomPort = SonopostUserDefinedSettings.Instance.DicomSetting.DicomPort;
            var dicomTempFileDays = SonopostUserDefinedSettings.Instance.DicomSetting.TempFileDays;
            if (_dicomEnabled != dicomEnabled || _dicomTitle != dicomTitle || _dicomPort != dicomPort || _dicomTempFileDays != dicomTempFileDays)
            {
                _dicomEnabled = dicomEnabled;
                _dicomTitle = dicomTitle;
                _dicomPort = dicomPort;
                _dicomTempFileDays = dicomTempFileDays;
                Stop();
                Start();
                CheckOverDueFile();
            }
        }

        private void CheckOverDueFile()
        {
            var tempFileDays = SonopostUserDefinedSettings.Instance.DicomSetting.TempFileDays;
            if (tempFileDays > 0)
            {
                _tokenSource = new CancellationTokenSource();
                _task = Task.Run(() =>
                {
                    while (!_tokenSource.IsCancellationRequested)
                    {
                        try
                        {
                            var originalDicom = Path.Combine(SonopostConstants.DataFolder, SonopostConstants.OriginalDicomFolder);
                            var originalVid = Path.Combine(SonopostConstants.DataFolder, SonopostConstants.OriginalVidFolder);
                            var tempFiles = Path.Combine(SonopostConstants.DataFolder, SonopostConstants.TempFiles);
                            var vinnoDicom = Path.Combine(SonopostConstants.DataFolder, SonopostConstants.VinnoDicomFolder);
                            Logger.WriteLineInfo($"DicomServerManager Start Delete OverDue Files,TempFileDays:{tempFileDays}");
                            DeleteOverDueFiles(originalDicom, tempFileDays);
                            DeleteOverDueFiles(originalVid, tempFileDays);
                            DeleteOverDueFiles(tempFiles, tempFileDays);
                            DeleteOverDueFiles(vinnoDicom, tempFileDays);
                            DeletetOverDueRecord(tempFileDays);
                            _remedicalManager.DeleteOverDueRecords(tempFileDays);
                            Logger.WriteLineInfo($"DicomServerManager Start Delete OverDue Files");
                        }
                        catch (Exception ex)
                        {
                            Logger.WriteLineError($"Delete Overdue file fail:{ex}");
                        }
                        finally
                        {
                            _manualResetEvent.WaitOne(TimeSpan.FromHours(1));
                        }
                    }
                }, _tokenSource.Token);
            }
        }

        private void DeletetOverDueRecord(int tempFileDays)
        {
            var failList = DicomUploadContextOperator.Instance.GetAll();
            foreach (var failItem in failList)
            {
                if (DateTime.Now - failItem.CreateTime >= TimeSpan.FromDays(tempFileDays))
                {
                    DicomUploadContextOperator.Instance.DeleteById(failItem.Id);
                }
            }
        }

        private void DeleteOverDueFiles(string path, int tempFileDays)
        {
            if (!Directory.Exists(path))
                return;

            var files = Directory.GetFiles(path);
            foreach (var file in files)
            {
                FileInfo fileInfo = new FileInfo(file);
                if (DateTime.Now - fileInfo.CreationTime >= TimeSpan.FromDays(tempFileDays))
                {
                    fileInfo.Delete();
                }
            }
            var directories = Directory.GetDirectories(path);
            foreach (var dir in directories)
            {
                DeleteOverDueFiles(dir, tempFileDays);
            }
        }

        public override void DoDispose()
        {
            try
            {
                Stop();
            }
            catch (Exception ex)
            {
                Logger.WriteLineError($"DicomServerManager DoDispose Error:{ex}");
            }
            base.DoDispose();
        }
    }
}