using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;
using Wayne.Lib.StateEngine;
using Wayne.Lib.StateEngine.Generic;

namespace SinochemInternetPlusApp.States.CarPlateMode
{
    public class SendWelcomeScreen : TimeoutState<FuelingPoint>
    {
        private byte sqNo;
        private bool bigScreenReplied = false;
        private bool cardReaderReplied = false;
        private int? requestId;

        protected override void Enter(StateEntry stateEntry, ref Transition transition)
        {
            base.Enter(stateEntry, ref transition);

            Main.CurrentEpsTrx.UpdateTrxStatusToDb(EpsTrxStatus.BeforeFueling);

            bigScreenReplied = false;
            cardReaderReplied = false;

            DebugLog($"为车牌号: {Main.CurrentEpsTrx.Model.car_number}, 卡号: {Main.CurrentEpsTrx.Model.card_no} 发送欢迎屏幕");

            if (Main.Eps.CarPlateHandler != null)
            {
                string text = CreateDisplayWelcomeCommand(Main.CurrentEpsTrx.Model);
                DebugLog(text);
                Main.Eps.CarPlateHandler.BroadcastMessageViaFdc(text);

                if (requestId.HasValue)
                {
                    DebugLog($"Adding RequestId: {requestId.Value} to the list");
                    Main.AddRequestId(requestId.Value);
                }
            }

            Main.SendICCardDisplay(Main.CurrentEpsTrx.Model.car_number, out sqNo);
        }

        protected override void HandleNonTimeoutEvent(StateEngineEvent stateEngineEvent, ref Transition transition)
        {
            if (stateEngineEvent.Type.Equals(EventType.DisplayResponseReceived))
            {
                var e = stateEngineEvent as GenericEvent<DisplayResponseEventArgs>;
                if (e != null && e.EventArgs != null)
                {
                    if (requestId.HasValue && requestId.Value == e.EventArgs.DispResponse.RequestId)
                    {
                        e.Handled = true;
                        bigScreenReplied = true;

                        if (Main.ContainsRequestId(requestId.Value))
                        {
                            DebugLog($"Removed RequestId: {requestId.Value} from the list");
                            Main.RemoveRequestId(requestId.Value);
                        }
                            

                        requestId = null;
                    }
                }
            }

            var ackEvent = stateEngineEvent as GenericEvent<CardReaderAckEventArgs>;
            if (ackEvent != null && ackEvent.EventArgs != null)
            {
                if (ackEvent.EventArgs.Ack.MessageSeqNumber == sqNo)
                {
                    ackEvent.Handled = true;
                    cardReaderReplied = true;
                }
            }

            if (bigScreenReplied && cardReaderReplied)
            {
                //Main.PrepareCardReaderResetToCarPlateIdle();
                transition = new Transition(this, TransitionType.Done);
            }
        }

        protected override void Timeout(ref Transition transition)
        {
            transition = new Transition(this, TransitionType.Timeout);
        }

        protected override int TimeoutInterval =>
            TimeoutValues.GetValueInMilliSec(TimeoutValues.FuelingPoint.CarPlateMode_SendWelcomeScreen, 20);

        private string CreateDisplayWelcomeCommand(EpsTransactionModel epsTrxModel)
        {
            Display display;
            string cmdText = "";
            XmlSerializer serializer = new XmlSerializer(typeof(Display));
            MemoryStream ms;
            StreamReader sr;

            display = new Display();
            display.ScreenType = ScreenType.Welcome;
            display.RequestId = Main.Eps.GetNextRequestId();
            requestId = display.RequestId;

            display.MemberInfo = new DisplayMemberInfo
            {
                LicensePlateNo = epsTrxModel.car_number,
                Id = "" // empty for now
            };

            display.PumpInfo = new DisplayPumpInfo
            {
                Id = 1,
                NozzleId = epsTrxModel.jihao
            };

            ms = new MemoryStream();
            serializer.Serialize(ms, display);

            ms.Position = 0;
            sr = new StreamReader(ms, true);
            cmdText = sr.ReadToEnd();
            ms.Close();
            sr.Close();

            return cmdText;
        }
    }
}