using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Timers;
using System.Threading.Tasks;
using log4net;

using bsmd.database;
using bsmd.dakosy;

namespace bsmd.dakosy.ResponseService
{
    /// <summary>
    /// Windows service zum Abruf von NSW Response Dateien via SFTP und Import der Dateien in die DB    
    /// </summary>
    public partial class SFTPService : ServiceBase
    {
        private Timer _timer;
        private object _timerlock = new object();
        private bool processRunning = false;
        private ILog _log = LogManager.GetLogger(typeof(SFTPService));

        public SFTPService()
        {
            Directory.SetCurrentDirectory(AppDomain.CurrentDomain.BaseDirectory);
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            this.EventLog.Source = this.ServiceName;
            this.EventLog.Log = "Application";
            this.EventLog.BeginInit();
            if (!EventLog.SourceExists(this.EventLog.Source, this.EventLog.Log))
                EventLog.CreateEventSource(this.EventLog.Source, this.EventLog.Log);
            this.EventLog.EndInit();

            this.Init(args);

            this.EventLog.WriteEntry("NSW SFTP Response Service started.", EventLogEntryType.Information);
        }

        protected override void OnStop()
        {
            _log.Info("SFTPService stopped");
        }

        public void Init(string[] args)
        {
            this._timer = new Timer();
            this._timer.Interval = 600000; // 10 Min, TODO: Settings
            this._timer.Elapsed += _timer_Elapsed;
            this._timer.Enabled = true;

            if (Debugger.IsAttached)
                this._timer_Elapsed(null, null);
        }

        void _timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            lock (this._timerlock)
            {
                if (this.processRunning) return;
                else this.processRunning = true;
            }

            string localDir = ""; // TBD

            if (DBManager.Instance.Connect(Properties.Settings.Default.ConnectionString))
            {
                try
                {

                    // SFTP verbindung öffnen und alle Dateien herunterladen
                    sftp.GetAll(localDir);
                    
                    
                    // lokale Dateien verarbeiten
                    foreach(string inputFile in Directory.GetFiles(localDir))
                    {
                        if (!Response.Read(inputFile))
                            _log.ErrorFormat("Error reading input file {0}", inputFile);
                        else
                            File.Delete(inputFile); // alternativ: move to archive folder
                    }

                }
                catch (Exception ex)
                {
                    _log.ErrorFormat("Exception occurred: {0}", ex.ToString());
                }
            }
            else
            {
                this.EventLog.WriteEntry("FormService stopped: DB connection failed", EventLogEntryType.Error);
                this.Stop();
            }

            lock (this._timerlock)
            {
                this.processRunning = false;
            }
        }
    }
}