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

namespace FiniteStateMachine.Core
{
    public class SensorStateChangedEventArgs : EventArgs
    {
        public StateContext.SensorState NewState { get; }

        public SensorStateChangedEventArgs(StateContext.SensorState newState)
        {
            NewState = newState;
        }
    }


    public class StateContext
    {
        public enum SensorState
        {
            NotDefine = -1,
            IN,
            START,
            OUT,
            WORKING
        }

        public event EventHandler<SensorStateChangedEventArgs> SensorStateChanged;

        private IState Actual;
        private int CurrentCounter;

        public SensorState CurrentSensorState { set; get; }
        private State1 S1;// = new State1(this);
        private State2 S2;// = new State2(this);
        private State3 S3;// = new State3(this);

        public StateContext(int counter)
        {
            S1 = new State1(this);
            S2 = new State2(this);
            S3 = new State3(this);

            Actual = S1;
            CurrentSensorState = SensorState.NotDefine;
            CurrentCounter = counter;
        }

        public void Working()
        {
            switch (CurrentSensorState)
            {
                default:
                    break;
                case SensorState.IN:
                    if (Actual == S1)
                    {
                        ++CurrentCounter;
                        Actual.Do();
                        ChangeState();
                        SensorStateChanged?.Invoke(this, new SensorStateChangedEventArgs(CurrentSensorState));
                    }
                    break;
            }

           

            //switch (CurrentSensorState)
            //{
            //    default:
            //        break;
            //    case SensorState.IN:
            //        if (Actual == S1)
            //        {
            //            ++CurrentCounter;
            //            Actual.Do();
            //            ChangeState();
            //        }
            //        break;
            //    case SensorState.START:
            //        if (Actual == S2)
            //        {
            //            ++CurrentCounter;
            //            Actual.Do();
            //            ChangeState();
            //        }
            //        break;
            //    case SensorState.OUT:
            //        if (Actual == S3)
            //        {
            //            ++CurrentCounter;
            //            Actual.Do();
            //            ChangeState();
            //        }
            //        break;
            //}
        }

        public void ChangeState()
        {
            Actual.Exit();

            if (Actual is State1)
            {
                Actual = S2;
            }
            else if (Actual is State2) //&& CurrentCounter > 20)
            {
                Actual = S3;
            }
            else if (Actual is State3)
            {
                Actual = S1;
            }
            else
            {

            }
            Actual.Entry();
        }
    }
}