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.Threading.Tasks;
using System.Timers;

using MigraDoc;
using MigraDoc.DocumentObjectModel;

using log4net;
using bsmd.database;

namespace bsmd.ReportGenerator
{
    public partial class ReportService : ServiceBase
    {

        private Timer _timer;
        private object _timerlock = new object();
        private bool processRunning = false;
        private ILog _log = LogManager.GetLogger(typeof(ReportService));

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

        protected override void OnStart(string[] args)
        {
            this.EventLog.Source = this.ServiceName;
            this.EventLog.Log = "Application";
            this.Init(args);
            this.EventLog.WriteEntry("Report Service started.", EventLogEntryType.Information);
            this.DoOnce();
        }

        private void Init(string[] args)
        {
            this._timer = new Timer();
            this._timer.Interval = Properties.Settings.Default.SleepSeconds * 1000;
            this._timer.Elapsed += _timer_Elapsed;
            this._timer.Enabled = true;
        }

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

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

                try
                {
                    // load all messages with report flag set
                    List<MessageCore> reportCores = DBManager.Instance.GetMessageCoresByStatus(MessageCore.BSMDStatus.CREATE_RECEIVE_RECEIPT);

                    // create report documents for each of the messages
                    foreach (MessageCore reportCore in reportCores)
                    {
                        List<Message> messages = DBManager.Instance.GetMessagesForCore(reportCore);

                        Document migraDocument = BSMDDocument.CreateDocument(
                            string.Format("NSW Eingangsdatenübersicht für IMO {0}, ETA {1}", reportCore.IMO, reportCore.ETA),
                            "NSW Meldung",
                            Properties.Settings.Default.ReportAuthor);                                               

                        // print header area (with message core data)

                        // print messages in subsequent tables
                        foreach (Message message in messages)
                        {
                            BSMDDocument.AddNSWMessageParagraph(migraDocument, message);
                        }

                        // prepare and send E-Mail with generated attachment
                        string fullPath = string.Format("{0}\\{1}.pdf", Properties.Settings.Default.OutputDirectory,
                            reportCore.Id);
                        BSMDDocument.RenderDocument(migraDocument, fullPath);
                        _log.InfoFormat("Document created for MessageCoreId {0}, IMO {1}", reportCore.Id, reportCore.IMO);
                        BSMDMail.SendNSWReportAsAttachment(reportCore, fullPath);

                        // reset status on core message (get ready to prepare)
                        reportCore.BSMDStatusInternal = MessageCore.BSMDStatus.PREPARE;
                        DBManager.Instance.Save(reportCore);
                    }                    

                    DBManager.Instance.Disconnect();

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

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

        protected override void OnStop()
        {
        }

        internal void DoOnce()
        {
            this._timer_Elapsed(null, null);
        }
    }
}