using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace ApiProcess.Process
{
    public abstract class MainThread
    {
        //Cac thuoc tinh cua Thead
        private const string PROCESSING_THREAD_NAME = "ProcThread";
        private const byte PROC_INITIALISING = 0;
        private const byte PROC_RECEIVING = 1;
        private const byte PROC_FINISHED = 2;
        private object _ProcessingStatusLock = new object();
        private byte _ProcessingStatus = PROC_INITIALISING;
        private int _ThreadIndex = 0;
        private bool _KeepProcessing = true;
        private Exception _TermException = null;
        private Thread _ProcessingThread = null;
        private bool _ThreadSleeping = false;
        public abstract void Process();

        //Cac phuong thuc cua thread
        public virtual void Start(string _name)
        {

            if (!IsProcessing())
            {
                // i.e. is initialising or finished
                SetProcessingStatus(PROC_INITIALISING);
                _TermException = null;
                _KeepProcessing = true;

                //To name a delegate.
                ThreadStart ts = new ThreadStart(Run);
                _ProcessingThread = new Thread(ts);
                _ProcessingThread.Name = _name;
                _ProcessingThread.Start();
                while (IsInitialising())
                {
                    Sleep(30);

                }
            }

        }//End of Start by name
        public virtual void Start()
        {
            if (!IsProcessing())
            {

                SetProcessingStatus(PROC_INITIALISING);
                _TermException = null;
                _KeepProcessing = true;


                ThreadStart ts = new ThreadStart(Run);
                _ProcessingThread = new Thread(ts);
                _ProcessingThread.Name = GenerateDefaultIndexedThreadName();
                _ProcessingThread.Start();
                while (IsInitialising())
                {
                    Sleep(10);

                }
            }
        }//End of Start

        public virtual void Stop(int timeout)
        {
            if (IsProcessing())
            {
                StopProcessing(null);

                if (_ProcessingThread.ThreadState == ThreadState.WaitSleepJoin)
                {
                    _ProcessingThread.Interrupt();
                }
                DateTime dt = DateTime.Now;
                while (!IsFinished())
                {
                    TimeSpan tp = DateTime.Now - dt;
                    if (tp.TotalMilliseconds < timeout)
                    {
                        Sleep(10);
                    }
                    else
                    {
                        _ProcessingThread.Abort();
                    }

                }
            }
        }

        public virtual void Stop()
        {
            if (IsProcessing())
            {
                StopProcessing(null);

                if (_ProcessingThread.ThreadState == ThreadState.WaitSleepJoin)
                {
                    _ProcessingThread.Interrupt();
                }
                while (!IsFinished())
                {
                    Sleep(10);
                }
            }
        }


        protected void StopProcessing(Exception e)
        {
            SetTermException(e);
            _KeepProcessing = false;
        }


        public void Run()
        {
            try
            {
                SetProcessingStatus(PROC_RECEIVING);
                while (_KeepProcessing)
                {
                    try
                    {
                        Process();
                    }
                    catch (Exception e1)
                    {

                        Console.WriteLine(e1.ToString());
                        _KeepProcessing = false;
                    }

                    Sleep(10);
                }
            }
            catch (Exception e)
            {
                SetTermException(e);

            }
            finally
            {
                SetProcessingStatus(PROC_FINISHED);
                //debug_.exit(DUTL,this);
            }
        }


        public string GenerateDefaultIndexedThreadName()
        {
            return GetDefaultThreadName() + "-" + GetThreadIndex();
        }


        public virtual string GetThreadName()
        {
            return _ProcessingThread.Name;
        }


        public string GetDefaultThreadName()
        {
            return PROCESSING_THREAD_NAME;
        }

        public int GetThreadIndex()
        {
            return ++_ThreadIndex;
        }

        public int GetSystemCurrentThreadID()
        {
            return AppDomain.GetCurrentThreadId();
        }


        protected void SetTermException(Exception e) { _TermException = e; }


        public Exception GetTermException()
        {
            return _TermException;
        }


        private void SetProcessingStatus(byte value)
        {
            lock (_ProcessingStatusLock)
            {
                _ProcessingStatus = value;
            }
        }


        private bool IsInitialising()
        {
            lock (_ProcessingStatusLock)
            {
                return _ProcessingStatus == PROC_INITIALISING;
            }
        }


        public bool IsProcessing()
        {
            lock (_ProcessingStatusLock)
            {
                return _ProcessingStatus == PROC_RECEIVING;
            }
        }


        public bool IsFinished()
        {
            lock (_ProcessingStatusLock)
            {
                return _ProcessingStatus == PROC_FINISHED;
            }
        }

        public void Sleep(int timeout)
        {
            try
            {
                _ThreadSleeping = true;
                Thread.Sleep(timeout);//wait 1 minute
                _ThreadSleeping = false;
            }
            catch (ThreadInterruptedException e)
            {
                _ThreadSleeping = false;
                //Console.WriteLine(e.Message);
            }
        }

        public bool IsSleeping()
        {
            return _ThreadSleeping;
        }





    }
}