using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Text;
using GZTW.AyaNova.BLL;

namespace GeneratorService
{
    public partial class AyGenSrv : ServiceBase
    {
        private System.Timers.Timer timer = null;
        private bool Initialized = false;
        private int maxTries = 0;
        private const int retryInterval = 60000;
        private const int processInterval = 300000;
        //case 2048
        private string eventLogSource = "AyaNovaGenerator";

        public AyGenSrv()
        {
            InitializeComponent();
            //Init timer and set initial interval to 1 second
            //so that it starts "immediately" when the service starts
            //after it's fired it will go to it's normal cycle of 5 minutes
            timer = new System.Timers.Timer(1000);
            //set the event handler for the timer
            timer.Elapsed += new System.Timers.ElapsedEventHandler(this.ServiceTimer_Tick);
            
          
        }


        private bool TryConnecting()
        {
            //Failed to connect after maxtries?
            if (maxTries > 9)
            {
                EventLog.WriteEntry(eventLogSource,
                   "Connection to AyaNova database could not be initialized after 10 attempts.\r\n" +
                   "Other errors in the application error log before or after this one may provide more details.\r\n" +
                   "The configuration file config.txt probably has an incorrect connection setting\r\n" +
                   "to access the database (wrong path, login or password) or the database server is not running.", EventLogEntryType.Error);
                QuitNow();
                return false;
            }

            if (GZTW.AyaNova.BLL.AyaBizUtils.AyaNovaConnectionSetting.SingleUserConnection)
            {
                EventLog.WriteEntry(eventLogSource,
                "The current database connection in the config.txt file specifies a stand alone embedded FireBird database.\r\n" +
              "Generator is not required for a single user database connection.  It's required for a shared network connection only.\r\n" +
              "In a single user connection AyaNova handles the tasks of Generator automatically.\r\n" +
              "Generator will now close.\r\n" +
              "See the AyaNova manual for more details.", EventLogEntryType.Error);
                QuitNow();
                return false;
            }

            //not timed out so try to connect
            try
            {
                GZTW.AyaNova.BLL.AyaBizUtils.Initialize();
               //case 2093 ampersand in name crashing generator service
               // eventLogSource = "AyaNovaGenerator - (" + AyaBizUtils.REGTO + ")";
                eventLogSource = "AyaNovaGenerator - (" + System.Text.RegularExpressions.Regex.Replace(AyaBizUtils.REGTO, @"[^A-Za-z0-9]+", "") +")";
                
                Initialized = true;
                EventLog.WriteEntry(eventLogSource,
                   "Connection established", EventLogEntryType.Information);
            }
            catch (Exception ex)
            {
                Initialized = false;
                maxTries++;

               if(maxTries < 10)
                   EventLog.WriteEntry(eventLogSource,
                    "Connection failed (attempt "+maxTries.ToString()+" of 10 ) - retrying in 1 minute", EventLogEntryType.Warning);
                
                //Only log the last attempt, earlier ones could have been waiting for dbserver to start and not relevant
                string strMessage = ex.Message;
                if (ex.InnerException != null)
                    strMessage = ex.InnerException.Message;
                if(maxTries > 9)
                    EventLog.WriteEntry(eventLogSource, strMessage, EventLogEntryType.Error);

            }

            return Initialized;
        }

        private void QuitNow()
        {
            timer.Stop();
            timer.AutoReset = false;
            timer.Enabled = false;
            this.Stop();
        }

        protected override void OnStart(string[] args)
        {
          
            timer.AutoReset = true;
            timer.Enabled = true;
            timer.Start();


        }

        protected override void OnStop()
        {

            timer.Stop();
            timer.AutoReset = false;
            timer.Enabled = false;
            base.OnStop();
        }

        protected override void OnPause()
        {
            timer.Stop();
            base.OnPause();
        }

        protected override void OnContinue()
        {
            
            timer.Start();
            base.OnContinue();
        }


        //process
        private void ServiceTimer_Tick(object sender, System.Timers.ElapsedEventArgs e)
        {
            this.timer.Stop();

           
            //make an appearance of less memory for those that don't understand how .net memory allocation works
            //and bitch to us that task manager shows it's using too much memory
            try
            {
                System.Diagnostics.Process loProcess = System.Diagnostics.Process.GetCurrentProcess();
                loProcess.MaxWorkingSet = loProcess.MaxWorkingSet;//doesn't matter what you set it to, just setting it triggers re-evalutaion
            }
            catch { };

            //If not initialized restart with a shorter timer than normal
            if (!Initialized)
            {
                if (!TryConnecting())
                {
                    this.timer.Interval = retryInterval;
                    this.timer.Start();
                    return;
                }
            }

            //It's initialized so process as normal
            try
            {
                GenProcess.GO("121605GENERATOR", "121605GENERATOR");
            }
            catch (Exception ex)
            {
                string strMessage = ex.Message;
                if (ex.InnerException != null)
                    strMessage = ex.InnerException.Message;
                EventLog.WriteEntry(eventLogSource, strMessage, EventLogEntryType.Error);
            }
           


            this.timer.Interval = processInterval;
            this.timer.Start();
        }

        
    }
}