using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using Wayne.Lib;
using Wayne.Lib.Log;


namespace Wayne.ForecourtControl.Fusion
{
    class AsyncResponseOperation : IDisposable
    {
        public int requestId;
        public EventHandler<AsyncCompletedEventArgs> requestCompleted;
        public long resultLong;
        public ITankReadingEx resultITankReading;
        public ITankReconciliation resultITankReconciliation;
        public ITankDelivery resultITankDelivery;
        public IList<IFuelPriceReading> resultFuelPriceReading;
        public PumpAccumulatorReading resultPumpAccumulatorReading;
        public object userToken;
        public object src;
        private System.Threading.Timer responseTimer = null;
        public event EventHandler OnResponseTimeout;

        public AsyncResponseOperation(int requestId, int responseTimeout, EventHandler<AsyncCompletedEventArgs> requestCompleted, object userToken, object src)
        {
            this.requestId = requestId; 
            this.requestCompleted = requestCompleted;
            this.userToken = userToken;
            this.src = src;
            if (responseTimeout > 0)
                responseTimer = new System.Threading.Timer(new System.Threading.TimerCallback(ResponseTimeout), this, responseTimeout, System.Threading.Timeout.Infinite);
        }

        public void Dispose()
        {
            if (responseTimer != null)
                responseTimer.Dispose();
        }

        private void ResponseTimeout(Object state)
        {
            if (OnResponseTimeout != null) 
                OnResponseTimeout.Invoke(this, null);
        }
    }


    public class AsyncResponseManager
    {
        public Hashtable AsyncResponseOperationList;
        public event EventHandler OnResponseTimeout;
        private readonly DebugLogger debugLogger;

        public AsyncResponseManager(DebugLogger debugLogger)
        {
            this.debugLogger = debugLogger;
            AsyncResponseOperationList = new Hashtable();
        }

        private void DebugLog(string s)
        {
            if (debugLogger.IsActive())
                debugLogger.Add(s);
        }

        public void OnMessageEnqueuing(object sender, MessageEnqueuedEventArgs e)
        {
            // add the request to the 'waiting for response request list'

            DebugLog("init enqueuing message");

            AsyncResponseOperation asyncResponseOperation = null;
            try
            {
                Monitor.Enter(AsyncResponseOperationList);
                if (e.ResponseRequired)
                {
                    if (e.RequestCompleted != null)
                        asyncResponseOperation = new AsyncResponseOperation(e.RequestId, e.ResponseTimeout, e.RequestCompleted, e.UserToken, e.Scr);
                    else
                        asyncResponseOperation = new AsyncResponseOperation(e.RequestId, e.ResponseTimeout, null, null, null);

                    asyncResponseOperation.OnResponseTimeout += new EventHandler(asyncResponseOperation_OnResponseTimeout);
                    AsyncResponseOperationList.Add(e.RequestId, asyncResponseOperation);
                }
            }
            catch (Exception ex)
            {
                DebugLog("Exception! " + ex.ToString());
            }
            finally
            {
                Monitor.Exit(AsyncResponseOperationList);
            }
            DebugLog("end enqueuing message");
        }

        private void asyncResponseOperation_OnResponseTimeout(object sender, EventArgs e)
        {
            DebugLog("OnResponseTimeout init");

            var operation = sender as AsyncResponseOperation;
            SendResponse(operation.requestId, false);

            if (OnResponseTimeout != null)
                OnResponseTimeout.Invoke(this, e);

            DebugLog("OnResponseTimeout end");
        }

                
        public void SendResponse(int requestId, bool result)
        {
            SendResponse(requestId, result, null);
        }

        /// <summary>
        /// Invokes the standard EventHandler&lt;AsyncCompletedEventArgs&gt; , but with an instance of 
        /// AsyncCompletedEventArgs&lt;TResponseData&gt; is actually passed as an argument. So the actual 
        /// response data is sent, even through the signature is unchanged.
        /// </summary>
        /// <typeparam name="TResponseData"></typeparam>
        /// <param name="requestId"></param>
        /// <param name="result"></param>
        /// <param name="responseData"></param>
        public void SendResponse<TResponseData>(int requestId, bool result, TResponseData responseData)
        {
            AsyncResponseOperation asyncResponseOperation = null;
            try
            {
                DebugLog(string.Format("SendResponse init requestId={0}", requestId));
                Monitor.Enter(AsyncResponseOperationList);
                if (AsyncResponseOperationList.ContainsKey(requestId))
                {
                    asyncResponseOperation = (AsyncResponseOperation)(this.AsyncResponseOperationList[requestId]);
                    this.RemoveRequest(requestId); 
                }
                DebugLog(string.Format("SendResponse got operation requestId={0}", requestId));
            }
            catch (Exception ex)
            {
                DebugLog("AsyncResponseOperation Exception! " + ex.ToString());
            }
            finally
            {
                Monitor.Exit(AsyncResponseOperationList);
            }

            try
            {
                if (asyncResponseOperation != null)
                {
                    if (asyncResponseOperation.requestCompleted != null)
                    {
                        DebugLog(string.Format("SendResponse requestId={0} requestCompleted != null", requestId));
                        asyncResponseOperation.requestCompleted(asyncResponseOperation.src, new AsyncCompletedEventArgs<TResponseData>(result, responseData, asyncResponseOperation.userToken));
        }
                }
                DebugLog(string.Format("SendResponse end requestId={0}", requestId));
            }
            catch (Exception ex)
            {
                DebugLog("SendResponse Exception! " + ex.ToString());
        }
        }
        public void SendResponse(int requestId, bool result, Object objresult)
        {
            AsyncResponseOperation asyncResponseOperation = null;
            try
            {
                DebugLog(string.Format("SendResponse init requestId={0}", requestId));
                Monitor.Enter(AsyncResponseOperationList);
                if (AsyncResponseOperationList.ContainsKey(requestId))
                {
                    asyncResponseOperation = (AsyncResponseOperation)(this.AsyncResponseOperationList[requestId]);
                    this.RemoveRequest(requestId);
                }
                DebugLog(string.Format("SendResponse got operation requestId={0}", requestId));
            }
            catch (Exception ex)
            {
                DebugLog("AsyncResponseOperation Exception! " + ex.ToString());
            }
            finally
            {
                Monitor.Exit(AsyncResponseOperationList);
            }

            try
            {
                if (asyncResponseOperation != null)
                {
                    if (asyncResponseOperation.requestCompleted != null)
                    {
                        DebugLog(string.Format("SendResponse requestId={0} requestCompleted != null", requestId));
                        asyncResponseOperation.requestCompleted(asyncResponseOperation.src, new AsyncCompletedEventArgs(result, asyncResponseOperation.userToken));
                    }
                }
                DebugLog(string.Format("SendResponse end requestId={0}", requestId));
            }
            catch (Exception ex)
            {
                DebugLog("SendResponse Exception! " + ex.ToString());
            }
        }

        private void RemoveRequest(int requestId)
        {
            try
            {
                if (this.AsyncResponseOperationList.ContainsKey(requestId))
                {
                    AsyncResponseOperation asyncResponseOperation = (AsyncResponseOperation)(this.AsyncResponseOperationList[requestId]);
                    asyncResponseOperation.Dispose();
                    AsyncResponseOperationList.Remove(requestId);
                }
            }
            catch (Exception ex)
            {
                DebugLog("RemoveRequest Exception! " + ex.ToString());
            }
        }
    }
}