using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Wayne.Lib.StateEngine;
using Wayne.Lib.StateEngine.Generic;
using WayneChina_IcCardReader_SinoChem.MessageEntity;
using WayneChina_IcCardReader_SinoChem.MessageEntity.Outgoing;

namespace SinochemInternetPlusApp.States.Shared
{
    internal class PrintReceipt : TimeoutState<FuelingPoint>
    {
        protected byte sqNo;
        byte[] currentLine;
        int lineIndex = 0;
        bool printerReserved = false;

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

            DebugLog("nfe 1");
            if(!ConfigurationValues.PrintReceiptEnabled)
            {
                DebugLog("Print receipt is disabled.");
                transition = new Transition(this, TransitionType.Done);
                return;
            }
            if (Main.CurrentEpsTrx == null)
            {
                DebugLog("Do not print receipt when eps trx was not created for this trx.");
                transition = new Transition(this, TransitionType.Done);
                return;
            }
            else if (Main.CurrentEpsTrx != null && Main.CurrentEpsTrx.Model.trx_status != EpsTrxStatus.PaymentOk &&
                    string.IsNullOrEmpty(Main.CurrentEpsTrx.Model.pay_url))
            {
                DebugLog("The trx not paid yet and pay_url is null, don't need print receipt");
                transition = new Transition(this, TransitionType.Done);
                return;
            }

            if (Main.GetPrinter() || printerReserved)
            {
                DebugLog("nfe 4");
                printerReserved = true;
                if (Main.CurrentReceipt == null)
                {
                    DebugLog("nfe 5");
                    Main.BuildReceipt();
                    lineIndex = 0;
                }
                DebugLog("nfe 6");
                Main.SendCommand(CreateReceiptLine(lineIndex), out sqNo);
                lineIndex++;
            }
            else
            {
                if (Main.GetPrinterCount < 50)
                {
                    //Printer is busy now, wait
                    DebugLog("Printer is busy now");
                    transition = new Transition(this, TransitionType.Abort);
                }
                else
                {
                    DebugLog("why cannot i get the printer for such a long time???");
                    transition = new Transition(this, TransitionType.Done);
                }
            }
        }

        protected override void HandleNonTimeoutEvent(StateEngineEvent stateEngineEvent, ref Transition transition)
        {
            GenericEvent<CardReaderAckEventArgs> e = stateEngineEvent as GenericEvent<CardReaderAckEventArgs>;
            if (e != null && e.EventArgs != null)
            {
                if (e.EventArgs.Ack.MessageSeqNumber == sqNo)
                {
                    e.Handled = true;

                    if (currentLine[0] == 0x02)
                    {
                        Main.ReleasePrinter();
                        Main.CurrentReceipt.Clear();
                        Main.CurrentReceipt = null;
                        lineIndex = 0;
                        printerReserved = false;
                        transition = new Transition(this, TransitionType.Done);
                    }
                    else
                    {
                        transition = new Transition(this, TransitionType.Next);
                    }   
                }
            }
        }

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

        protected override int TimeoutInterval => 10 * 1000;

        private PrintReceiptRequest CreateReceiptLine(int i)
        {
            currentLine = Main.GetNextReceiptLine(i);
            return new PrintReceiptRequest(currentLine);
        }
    }
}