using Simulator.Controllers;
using Simulator.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Web;

namespace Simulator
{
    public class BackgroundService
    {
        private static SimulatorDbContext db = new SimulatorDbContext("Server=localhost;Database=simulator;Uid=simulator;Pwd=W5Cok8HAy1XoSa63qaRiM5BA8i1E6I;");
        private static string _PrivateDirectory = @"C:\pba\private";
        private static string _PrivateDirectoryAck = @"C:\pba\private\ack";
        private static string _PrivateDirectoryAckDone = @"C:\pba\private\ack\done";
        private static bool _Running = false;
        private static Thread _workerThread;


        public static void Start()
        {
            try
            {
                if (_Running)
                {
                    Stop();
                }

                _workerThread = new Thread(WorkAsync);
                _workerThread.Start();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }



        public static void Stop()
        {
            try
            {
                _Running = false;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }


        private static void WorkAsync()
        {
            try
            {
                _Running = true;

                while (_Running)
                {
                    string[] acks = Directory.GetFiles(_PrivateDirectoryAck, "*.log");

                    if (acks != null && acks.Length > 0)
                    {
                        foreach(string ack in acks)
                        {
                            string[] lines = File.ReadAllLines(ack);

                            if(lines != null && lines.Length > 0)
                            {
                                string type = null;
                                string udid = null;
                                string auftragsnummer = null;
                                string PGS = null;
                                string ZIP = null;
                                string BIRTHDATE = null;

                                foreach (string line in lines)
                                {
                                    if(line.StartsWith("TYPE:"))
                                    {
                                        type = line.Replace("TYPE:", "");
                                    }
                                    else if (line.StartsWith("UDID:"))
                                    {
                                        udid = line.Replace("UDID:", "");
                                    }
                                    else if (line.StartsWith("PGS:"))
                                    {
                                        PGS = line.Replace("PGS:", "");
                                    }
                                    else if (line.StartsWith("ZIP:"))
                                    {
                                        ZIP = line.Replace("ZIP:", "");
                                    }
                                    else if (line.StartsWith("BIRTHDATE:"))
                                    {
                                        BIRTHDATE = line.Replace("BIRTHDATE:", "");
                                    }
                                    else if (line.StartsWith("ORDER_ID:"))
                                    {
                                        auftragsnummer = line.Replace("ORDER_ID:", "");
                                    }
                                }

                                if (!string.IsNullOrEmpty(type) && !string.IsNullOrEmpty(udid) && !string.IsNullOrEmpty(auftragsnummer))
                                {
                                    Befund befund = db.GetBefundByAuftragsnummer(auftragsnummer, ZIP, BIRTHDATE);

                                    if(befund != null)
                                    {
                                        if (type == "SUBSCRIBE")
                                        {
                                            Patient patient = db.GetPatient(befund.PatientId);

                                            if (patient != null)
                                            {
                                                patient.UDID = udid;
                                                befund.Status = type;
                                                befund.UDID = patient.UDID;

                                                if (db.UpdatePatient(patient) && db.UpdateBefund(befund))
                                                {
                                                    HomeController.SendBefund(befund, patient);
                                                }
                                            }
                                        }
                                        else 
                                        {
                                            befund.Status = type;
                                            db.UpdateBefund(befund);
                                        }
                                    }
                                    else
                                    {
                                        Reject(type, udid, auftragsnummer, PGS, ZIP, BIRTHDATE);
                                    }
                                }
                            }

                            string move_file = Path.Combine(_PrivateDirectoryAckDone, Path.GetFileName(ack));

                            if (File.Exists(move_file))
                            {
                                File.Delete(move_file);
                            }

                            File.Move(ack, move_file);
                        }
                    }

                    Thread.Sleep(1000);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                System.IO.File.AppendAllText(@"C:\tmp\simulator.txt", "Error: " + ex.Message);
            }
        }

        public static void Reject(string type, string udid, string auftragsnummer, string PGS, string ZIP, string BIRTHDATE)
        {
            try
            {
                string testhl7 = Path.Combine(Path.GetDirectoryName(AppDomain.CurrentDomain.BaseDirectory), "befund.hl7");
                string content = System.IO.File.ReadAllText(testhl7);

                content = content.Replace("[BIRTHDAY]", BIRTHDATE);
                content = content.Replace("[ZIP]", ZIP);
                content = content.Replace("[SAMPLEID]", auftragsnummer);
                content = content.Replace("[UDID]", udid);
                content = content.Replace("[STATUS]", "NOT_FOUND");
                content = content.Replace("[PGS]", PGS);
                string pgs = HomeController.SHA512HASH(ZIP + BIRTHDATE + auftragsnummer);
                string newFile = Path.Combine(_PrivateDirectory, pgs + ".hl7");

                System.IO.File.AppendAllText(@"C:\tmp\simulator.txt", "Reject: " + newFile + ", content: " + content);

                System.IO.File.WriteAllText(newFile, content);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                System.IO.File.AppendAllText(@"C:\tmp\simulator.txt", ex.Message);
            }
        }
    }
}