using BS.Shared;
using BS.Shared.AppSender;
using BS.Shared.Core;
using BS.Shared.DataContracts;
using BS.Shared.DataContracts.GkvAbrechnung;
using BS.Shared.Exceptions;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace DakotaSender
{
	class Program
	{
		static bool time_in_line = false;
		static bool is_dakota_running = false;

		static Dictionary<string, Dictionary<long, GkvClientResultRequestDC>> ten2user2req;

		static void Main(string[] args)
		{
			if (Config.QueueFolder.GetFiles("*.auf", SearchOption.TopDirectoryOnly).Length == 0)
			{
				return;
			}

			var logfolderpath = Config.LogPath;
			var logfilename = Config.LogSingleFile ? Config.LogFileName : $"log_{DateTime.Today:yyyyMMdd}.txt";
			var log4day = Path.Combine(logfolderpath, logfilename);

			FileStream filestream = new FileStream(log4day, FileMode.Append);
			var streamwriter = new StreamWriter(filestream);
			streamwriter.AutoFlush = true;

			Console.SetOut(streamwriter);
			Console.SetError(streamwriter);

			try
			{
				PrintSeperator();

				HandleQueueFiles();

				PrintSeperator();

				HandleResults();
			}
			catch (Exception e)
			{
				HandleException(e, null);

				if (is_dakota_running)
				{
					PrintSeperator();
					PrintLine($"Verarbeitung im Silent Modus fehlgeschlagen. dakota30.exe läuft (bereits).");
					PrintLine("Ignoriere Verarbeitung aktuell. Versuche im nächsten Programm Aufruf erneut.");
				}

				PrintSeperator();
			}

			PrintLine();
		}

		internal static void PrintTitle()
		{
			PrintLine();
			PrintSeperator();
			PrintLine("Dakota Sender Modul");
			PrintSeperator();
		}
		internal static void PrintSeperator() => PrintLine("-------------------");
		internal static void PrintEnd()
		{
			PrintLine("Ende");
			PrintSeperator();
		}
		internal static void PrintLine() => PrintWithTime("\n", false);
		internal static void PrintLine(string line)
		{
			PrintWithTime(line + "\n", !time_in_line);

			time_in_line = false;
		}
		internal static void Print(string line)
		{
			PrintWithTime(line, !time_in_line);

			time_in_line = true;
		}
		internal static void PrintWithTime(string line, bool showTime)
		{
			if (showTime)
				Console.Write($"[{DateTime.Now:dd.MM.yy HH:mm:ss.fff}] {line}");
			else
				Console.Write(line);
		}
		internal static void PrintFileInfo(DakotaSystemFile file)
		{
			Print($"Verarbeite Datei: {file.SourceNutzdatendatei.Name}" );
			PrintLine($"(T:{file.Tenant}, U:{file.ApplicationUserOid}, P:{file.ProtokollOid}, D:{file.Datenannahmestelle})");
		}
		internal static void HandleException(Exception e, string tenant) 
		{
			MailUtils.SendGkvModuleErrorMail("GkvSender Exception", e, tenant);

			PrintLine(e.ToString()); 
		}

		static void CheckDakotaStatus(bool sub = false)
		{
			if (sub)
				Print("- ");

			Print("Überprüfe Dakota Status: ");

			var code = ExecuteDakota("-s");

			Returncodes.EvaluateStatusCode(code, out is_dakota_running, out bool accept, out string message);

			if (accept)
			{
				PrintLine("Ok.");
			}
			else
			{
				throw new Exception($"Statuscode {code} wird nicht akzeptiert. {message}");
			}
		}

		static Dictionary<string, Dictionary<string, List<DakotaSystemFile>>> ScanQueueFolder()
		{
			var queue = Config.QueueFolder;

			var files = queue.GetFiles("*.auf", SearchOption.TopDirectoryOnly)
				.OrderBy(x => x.FullName);

			var ten2dat2files = new Dictionary<string, Dictionary<string, List<DakotaSystemFile>>>();
			foreach (var auft in files)
			{
				var file = ScanQueueFile(auft);

				if (file is null)
					continue;

				var tenant = file.Tenant;
				var datenannahmestelle = file.Datenannahmestelle;

				if (!ten2dat2files.ContainsKey(tenant))
					ten2dat2files.Add(tenant, new Dictionary<string, List<DakotaSystemFile>>());

				var dat2files = ten2dat2files[tenant];

				if (!dat2files.ContainsKey(datenannahmestelle))
					dat2files.Add(datenannahmestelle, new List<DakotaSystemFile>());

				ten2dat2files[tenant][datenannahmestelle].Add(file);
			}

			if (ten2dat2files.Any())
				return ten2dat2files;

			PrintLine("Keine gültigen Dakota Dateien in Queue gefunden.");
			return null;
		}
		static DakotaSystemFile ScanQueueFile(FileInfo auft)
		{
			string tenant = null;

			try
			{
				var nutz_fullname = auft.FullName.Substring(0, auft.FullName.Length - 4);
				var nutz = new FileInfo(nutz_fullname);

				if (!nutz.Exists)
				{
					PrintLine($"{auft.FullName} wird ignoriert. {nutz.FullName} nicht vorhanden");
					return null;
				}

				PrintLine($"- {auft.FullName}");

				var split = nutz.Name.Split('_');
				tenant = split[0];
				var app_oid = long.Parse(split[1]);
				var p_oid = long.Parse(split[2]);
				var datenannahmestelle = split[3];
				var transfername = split[4];

				var test = DakotaSenderUtils.IsTenantTest(tenant);
				var allow = DakotaSenderUtils.IsTenantAllowed(tenant);

				if(!test && !allow)
				{
					PrintLine($"{auft.FullName} wird ignoriert. Tenant \'{tenant}\' ungültig.");
					return null;
				}

				var file = new DakotaSystemFile()
				{
					TestCase = test,
					SourceAuftragsdatei = auft,
					SourceNutzdatendatei = nutz,
					Tenant = tenant,
					ProtokollOid = p_oid,
					ApplicationUserOid = app_oid,
					Datenannahmestelle = datenannahmestelle,
					Transfername = transfername,
				};

				return file;
			}
			catch(Exception e)
			{
				HandleException(e, tenant);
			}

			return null;
		}

		static void HandleQueueFiles()
		{
			CheckDakotaStatus();

			PrintSeperator();

			PrintLine("Scanne Dakota Dateien:");

			var ten2dat2files = ScanQueueFolder();

			PrintSeperator();

			if (ten2dat2files is null)
			{
				return;
			}

			ten2user2req = new Dictionary<string, Dictionary<long, GkvClientResultRequestDC>>();

			foreach (var kv in ten2dat2files)
			{
				var ten = kv.Key;
				var dat2files = kv.Value;

				foreach (var kv2 in dat2files)
				{
					var dat = kv2.Key;
					var files = kv2.Value;

					//PrintLine($"Bearbeite Datenannahmestelle \'{dat}\' für Tenant \'{ten}\':");

					HandleQueueFiles(files);

					CheckDakotaStatus(true);
				}
			}
		}
		static void HandleQueueFiles(List<DakotaSystemFile> files)
		{
			bool error = false;

			foreach (var file in files)
			{
				if (!error)
				{
					var msg = HandleQueueFile(file, out bool success);

					if (success)
					{
						PrintLine(msg);

						Add2Results(file, GkvTransferResultType.Success);

						FileController.CopyFileToCopy(file);

						FileController.CopyFileToSuccesss(file);
					}
					else
					{
						error = true;

						PrintLine("Fehler gefunden. " + msg);

						Add2Results(file, GkvTransferResultType.FailSoft, msg, "DS:Fehler");

						FileController.CopyFileToCopy(file);

						FileController.CopyFileToFailed(file);
					}
				}
				else
				{
					PrintLine($"Folgefehler: {file.SourceNutzdatendatei.Name}");

					Add2Results(file, GkvTransferResultType.FailFollowUp, "Wird neu erstellt und übertragen.", "DS:Folgefehler");
				}

				FileController.DeleteQueueFile(file);


			}
		}
		/// <summary>
		/// Bearbeitet eine File. Wenn dakota.exe während der Bearbeitung gestartet wird, wird das Dakota Verzeichnis gesäubert und die weitere Bearbeitung durch throw Exception unterbrochen.
		/// </summary>
		/// <param name="file"></param>
		/// <param name="success"></param>
		/// <returns></returns>
		static string HandleQueueFile(DakotaSystemFile file, out bool success)
		{
			success = false;

			PrintFileInfo(file);

			if (file.TestCase)
			{
				success = true;
				return "- TestCase. ";
			}

			if (!Config.IsDatenannahmestelleValid(file.Datenannahmestelle))
				return $"- Datenannahmestelle {file.Datenannahmestelle} unbekannt.";

			FileController.CopyFileToDestination(file);

			Print("- Sende via Dakota. ");

			var rc = ExecuteDakota("-x");

			Returncodes.EvaluateSendCode(rc, out is_dakota_running, out success, out string message);

			if (!success)
			{
				FileController.DeleteDakotaFile(file);
			}

			if (is_dakota_running)
			{
				throw new Exception();
			}

			if (success)
				return "Ok.";
			else
				return message;
		}
		static void Add2Results(DakotaSystemFile file, GkvTransferResultType type, string nachricht = null, string title = null)
		{
			var tenant = file.Tenant;
			var user = file.ApplicationUserOid;

			if (!ten2user2req.ContainsKey(tenant))
				ten2user2req.Add(tenant, new Dictionary<long, GkvClientResultRequestDC>());

			var user2req = ten2user2req[tenant];

			if (!user2req.ContainsKey(user))
				user2req.Add(user, new GkvClientResultRequestDC()
				{
					UserOid = file.ApplicationUserOid,
					Tenant = file.Tenant,
					GkvSecretKey = Config.GkvSecretKey
				});

			var req = user2req[user];

			if (req.ResultDCs is null)
				req.ResultDCs = new List<GkvServerResultDC>();

			var item = new GkvServerResultDC();

			item.Datum = DateTime.Now;
			item.Nachricht = nachricht;
			item.ProtokollOid = file.ProtokollOid;
			item.ResultType = type;
			item.Titel = title;

			req.ResultDCs.Add(item);
		}

		static void HandleResults()
		{
			if (ten2user2req is null || !ten2user2req.Any())
				return;

			PrintLine("Sende Ergebnisse:");
			PrintSeperator();

			var task = HandleResultsAsync();

			task.Wait();

			if (task.IsFaulted)
				throw task.Exception;
		}
		static async Task HandleResultsAsync()
		{
			var tasks = new List<Task>();
			foreach (var tenant in ten2user2req.Keys)
			{
				foreach (var user in ten2user2req[tenant].Keys)
				{
					var req = ten2user2req[tenant][user];

					var task = HandleResult(req, tenant, user);

					tasks.Add(task);
				}
			}

			await Task.WhenAll(tasks);
		}
		static async Task HandleResult(GkvClientResultRequestDC req, string tenant, long user)
		{
			var res = new GkvResponseDC(false, "empty");

			try
			{
				PrintLine($"Sende Ergebnis an: Tenant: {req.Tenant}, User; {req.UserOid}");

				res = await GkvSender.SendKundenAppClientRequestAsync<GkvClientResultRequestDC, GkvResponseDC>(req, tenant, user);

				if (res.Success)
					PrintLine("Erfolgreich!");
				else
					PrintLine("Fehler: " + res.Message);
			}
			catch (GkvException e)
			{
				HandleException(e, tenant);
			}
			catch (Exception e)
			{
				HandleException(e, tenant);
			}

			PrintSeperator();

			if (res.Success)
				return;

			foreach (var result in req.ResultDCs)
			{
				FileController.SaveAsXmlFileInResultFolder(result, tenant, user);
			}

			PrintSeperator();
		}

		static int ExecuteDakota(string arg)
		{
			var fileinfo = Config.DakotaExe;

			var process = Process.Start(Config.DakotaExe.FullName, arg);

			var success = process.WaitForExit(Config.ProcessWaitForExitMs);

			if (success)
			{
				return process.ExitCode;
			}
			else
			{
				PrintLine($"{fileinfo.Name} {arg} wird ausgeführt");

				throw new Exception($"dakota30.exe - Timeout exceeded ({Config.ProcessWaitForExitMs} ms). ");
			}
		}
	}
}