using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using Minio;
using Minio.DataModel;
using Minio.DataModel.Args;
using Minio.Exceptions;
using skyscraper5.Dvb.DataBroadcasting.SkyscraperVfs;
using skyscraper5.Skyscraper.Scraper.Storage.Split;
using skyscraper8.DvbNip;
using skyscraper8.Ietf.FLUTE;

namespace skyscraper5.Data
{
    public class MinioObjectStorage : ObjectStorage
    {
        private readonly IMinioClient _minioClient;
        private readonly string _minioBucket;
        private List<Task> _tasks;
        private List<string> droppedFiles;

        public MinioObjectStorage(IMinioClient minioClient, string minioBucket)
        {
            _minioClient = minioClient;
            _minioBucket = minioBucket;
            _tasks = new List<Task>();
            droppedFiles = new List<string>();
        }

        private void WriteObject(string fullName, Stream buffer, string mime = "application/octet-stream", Dictionary<string, string> optionalData = null)
        {
            PutObjectArgs putObjectArgs = new PutObjectArgs();
            putObjectArgs = putObjectArgs.WithBucket(_minioBucket);
            putObjectArgs = putObjectArgs.WithObject(fullName);
            putObjectArgs = putObjectArgs.WithStreamData(buffer);
            //putObjectArgs = putObjectArgs.WithObjectSize(buffer.Length);
            putObjectArgs = putObjectArgs.WithContentType(mime);
            putObjectArgs = putObjectArgs.WithHeaders(optionalData);

            lock (_tasks)
            {
                _tasks.Add(_minioClient.PutObjectAsync(putObjectArgs).ContinueWith(task =>
                {
                    droppedFiles.Add(fullName);
                    definetlyKnownFiles.Add(fullName);
                    definetlyMissingFiles.Remove(fullName);
                    buffer.Close();
                    buffer.Dispose();
                }));
            }

            CleanTaskList();
        }

        private void CleanTaskList()
        {
            while (true)
            {
                bool done = true;
                lock (_tasks)
                {
                    foreach (Task task in _tasks)
                    {
                        if (task.IsCompleted)
                        {
                            _tasks.Remove(task);
                            Debug.WriteLine(String.Format("Removed completed Task: {0}", task.ToString()));
                            done = false;
                            break;
                        }
                    }
                }

                if (done)
                    break;
            }
        }
        
        public bool ObjectCarouselFileArrival(VfsFile vfsFile, int transportStreamId, int networkId)
        {
            string combine = string.Join('/', "DSM-CC_Objects", networkId.ToString(), transportStreamId.ToString(), vfsFile.SourcePid.ToString(), vfsFile.ToString().Substring(1));
            combine = combine.Replace('\\', '/');
            if (FileExists(combine))
                return false;

            Dictionary<string, string> extendedInfo = new Dictionary<string, string>();
            extendedInfo.Add(nameof(vfsFile.ObjectLocation.CarouselId), vfsFile.ObjectLocation.CarouselId.ToString());
            extendedInfo.Add(nameof(vfsFile.ObjectLocation.ModuleId), vfsFile.ObjectLocation.ModuleId.ToString());
            extendedInfo.Add(nameof(vfsFile.ObjectLocation.Version), vfsFile.ObjectLocation.Version.ToString());
            extendedInfo.Add(nameof(vfsFile.ObjectLocation.ObjectKey), BitConverter.ToString(vfsFile.ObjectLocation.ObjectKey));

            WriteObject(combine,new MemoryStream(vfsFile.FileContent),"application/octet-stream",extendedInfo);
            return true;
        }

        public void DataCarouselModuleArrival(int currentNetworkId, int currentTransportStreamId, int elementaryPid, ushort moduleModuleId, byte moduleModuleVersion, Stream result)
        {
            string combine = string.Join('/', "DSM-CC_Data", currentNetworkId.ToString(), currentTransportStreamId.ToString(), elementaryPid.ToString(), String.Format("{0}_V{1}.bin", moduleModuleId, moduleModuleVersion));
            if (FileExists(combine))
                return;

            WriteObject(combine, result);

            WantedModuleCoordinate coordinate = new WantedModuleCoordinate(currentNetworkId, currentTransportStreamId, elementaryPid, moduleModuleId, moduleModuleVersion);
            knownModuleCoordinates.Add(coordinate);
            wantedModuleCoordinates.Remove(coordinate);
        }

        public bool FileExists(string combine)
        {
	        if (definetlyMissingFiles == null)
		        definetlyMissingFiles = new HashSet<string>();
            if (definetlyKnownFiles == null)
                definetlyKnownFiles = new HashSet<string>();

            if (definetlyKnownFiles.Contains(combine))
                return true;
            if (definetlyMissingFiles.Contains(combine))
	            return false;

            if (droppedFiles != null)
            {
                if (droppedFiles.Contains(combine))
                    return true;
            }

            StatObjectArgs soa = new StatObjectArgs().WithBucket(_minioBucket).WithObject(combine);
            try
            {
                ObjectStat objectStat = _minioClient.StatObjectAsync(soa).Result;
                definetlyKnownFiles.Add(combine);
                return true;
            }
            catch (AggregateException e)
            {
                MinioException minioException = e.InnerExceptions[0] as MinioException;
                if (minioException.Message.Contains("Minio.Exceptions.ObjectNotFoundException"))
                {
	                definetlyMissingFiles.Add(combine);
                    return false;
                }
                else
                {
                    throw minioException;
                }
            }
        }

        public bool IsDsmCcModuleWanted(int currentNetworkId, int currentTransportStreamId, int elementaryPid, ushort moduleId, byte moduleVersion)
        {
            if (wantedModuleCoordinates == null)
                wantedModuleCoordinates = new HashSet<WantedModuleCoordinate>();
            if (knownModuleCoordinates == null)
                knownModuleCoordinates = new HashSet<WantedModuleCoordinate>();

            WantedModuleCoordinate coordinate = new WantedModuleCoordinate(currentNetworkId, currentTransportStreamId, elementaryPid, moduleId, moduleVersion);
            if (wantedModuleCoordinates.Contains(coordinate))
                return true;
            if (knownModuleCoordinates.Contains(coordinate))
                return false;

            string combine = String.Join('/', "DSM-CC_Data", currentNetworkId.ToString(), currentTransportStreamId.ToString(), elementaryPid.ToString(), String.Format("{0}_V{1}.bin", moduleId, moduleVersion));
            bool isWanted = !FileExists(combine);
            if (isWanted)
            {
                wantedModuleCoordinates.Add(coordinate);
            }
            else
            {
                knownModuleCoordinates.Add(coordinate);
            }
            return isWanted;
        }

        public bool TestForFramegrab(int currentNetworkId, int transportStreamId, ushort mappingProgramNumber, int mappingStreamElementaryPid)
        {
	        string combine = string.Join('/', "Framegrabs", currentNetworkId.ToString(), transportStreamId.ToString(), String.Format("{1}_{0}.jpg", mappingStreamElementaryPid, mappingProgramNumber));
	        return FileExists(combine);
        }

        public void StoreFramegrab(int currentNetworkId, int transportStreamId, ushort mappingProgramNumber, ushort pid, byte[] imageData)
        {
	        string combine = string.Join('/', "Framegrabs", currentNetworkId.ToString(), transportStreamId.ToString(), String.Format("{1}_{0}.jpg", pid, mappingProgramNumber));
			WriteObject(combine, new MemoryStream(imageData), "image/jpeg");
        }

        public void WaitForCompletion()
        {
            while (_tasks.Count > 0)
            {
                _tasks[0].Wait();
                _tasks.RemoveAt(0);
            }
            wantedModuleCoordinates?.Clear();
            knownModuleCoordinates?.Clear();
            definetlyKnownFiles?.Clear();
        }

        private HashSet<WantedModuleCoordinate> wantedModuleCoordinates;
        private HashSet<WantedModuleCoordinate> knownModuleCoordinates;
        private HashSet<string> definetlyKnownFiles;
        struct  WantedModuleCoordinate
        {
            private int currentNetworkId, currentTransportStreamId, elementaryPid;
            private ushort moduleId;
            private byte moduleVersion;

            public WantedModuleCoordinate(int currentNetworkId, int currentTransportStreamId, int elementaryPid, ushort moduleId, byte moduleVersion)
            {
                this.currentNetworkId = currentNetworkId;
                this.currentTransportStreamId = currentTransportStreamId;
                this.elementaryPid = elementaryPid;
                this.moduleId = moduleId;
                this.moduleVersion = moduleVersion;
            }

            public bool Equals(WantedModuleCoordinate other)
            {
                return currentNetworkId == other.currentNetworkId && currentTransportStreamId == other.currentTransportStreamId && elementaryPid == other.elementaryPid && moduleId == other.moduleId && moduleVersion == other.moduleVersion;
            }

            public override bool Equals(object obj)
            {
                return obj is WantedModuleCoordinate other && Equals(other);
            }

            public override int GetHashCode()
            {
                return HashCode.Combine(currentNetworkId, currentTransportStreamId, elementaryPid, moduleId, moduleVersion);
            }
        }

        private int uiVersion;
        private HashSet<string> definetlyMissingFiles;

        public void UiSetVersion(int version)
        {
            this.uiVersion = version;
        }

        public object[] GetPluginConnector()
        {
	        return new object[] { _minioClient, _minioBucket };
        }

        public void Ping()
        {
	        GetVersioningArgs args = new GetVersioningArgs().WithBucket(_minioBucket);
	        VersioningConfiguration vc = _minioClient.GetVersioningAsync(args).Result;
        }

        public bool DvbNipTestForFile(string announcedFileContentLocation)
        {
			string path = "/nip/" + DvbNipUtilities.MakeFilename(announcedFileContentLocation);
			bool result =  FileExists(path);
			return result;
        }

        public void DvbNipFileArrival(NipActualCarrierInformation carrier, FluteListener listener)
        {
	        string path = "/nip/" + DvbNipUtilities.MakeFilename(listener.FileAssociation.ContentLocation);
	        Stream stream = listener.ToStream();
	        WriteObject(path, stream);
        }
    }
}