using Aitex.Core.RT.Fsm;
using Aitex.Core.RT.Log;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;

namespace MECF.Framework.Common.Fsm
{
    public class ActiveFsm
    {
        public int FsmState
        {
            get { return _fsm.State; }
        }

        public string StringFsmStatus
        {
            get
            {
                return _fsmStateMap.ContainsKey(FsmState) ? _fsmStateMap[FsmState] : FsmState.ToString();
            }
        }

        Dictionary<int, string> _fsmStateMap = new Dictionary<int, string>();
        Dictionary<int, string> _fsmMessageMap = new Dictionary<int, string>();

        private Thread _thread = null;
        private IStateMachine _fsm = null;

        public ActiveFsm()
        {
            _fsm = new StateMachine();
        }

        public ActiveFsm(string name) : base()
        {
            _fsm = new StateMachine();
        }

        public void MapState(int state, string stringState)
        {
            _fsmStateMap[state] = stringState;
        }

        public void MapMessage(int msg, string stringMessage)
        {
            _fsmMessageMap[msg] = stringMessage;
        }

        public string GetStringMessage(int msg)
        {
            return _fsmMessageMap.ContainsKey(msg) ? _fsmMessageMap[msg] : msg.ToString();
        }

        protected void StartFsm(string name, int fsmInterval, int initState)
        {
            _fsm.Init(initState, fsmInterval);
            _fsm.Name = name;

            _fsm.Start();
            _thread = new Thread(new ThreadStart(_fsm.Loop));
            _thread.Name = _fsm.Name;
            _thread.Start();

            while (!_thread.IsAlive)
                Thread.Sleep(1);
        }

        protected void StopFsm()
        {
            if (_fsm == null)
                return;

            {
                _fsm.Stop();
            }

            if (_thread != null)
            {
                if (_thread.IsAlive)
                {
                    Thread.Sleep(100);
                    if (_thread.IsAlive)
                    {
                        try
                        {
                            _thread.Abort();
                        }
                        catch (Exception ex)
                        {
                            LOG.Error($" {_fsm.Name} FSM terminated, {ex.Message}");
                        }
                    }
                }
            }
        }

        protected void Transition<T, V>(T state, V msg, FsmFunc func, T next)
        {
            Debug.Assert(typeof(T).IsEnum && typeof(V).IsEnum);

            int _state = Convert.ToInt32(state);
            int _next = Convert.ToInt32(next);
            int _msg = Convert.ToInt32(msg);

            Transition(_state, _msg, func, _next);
        }

        protected void Transition(int state, int msg, FsmFunc func, int next)
        {
            if (_fsm != null)
                _fsm.Transition(state, msg, func, next);
        }

        protected void AnyStateTransition(int msg, FsmFunc func, int next)
        {
            if (_fsm != null)
                _fsm.AnyStateTransition(msg, func, next);
        }

        protected void AnyStateTransition<T, V>(V msg, FsmFunc func, T next)
        {
            Debug.Assert(typeof(T).IsEnum && typeof(V).IsEnum);

            int _next = Convert.ToInt32(next);
            int _msg = Convert.ToInt32(msg);
            AnyStateTransition(_msg, func, _next);

        }

        protected void EnterExitTransition<T, V>(T state, FsmFunc enter, Nullable<V> msg, FsmFunc exit) where V : struct
        {
            Debug.Assert(typeof(T).IsEnum && ((msg == null) || typeof(V).IsEnum));

            int _state = Convert.ToInt32(state);

            int _msg = msg == null ? (int)FSM_MSG.NONE : Convert.ToInt32(msg);
            EnterExitTransition(_state, enter, _msg, exit);
        }

        protected void EnterExitTransition(int state, FsmFunc enter, int msg, FsmFunc exit)
        {
            if (_fsm != null)
                _fsm.EnterExitTransition(state, enter, msg, exit);
        }


        public void PostMsg<T>(T msg, params object[] args) where T : struct
        {
            Debug.Assert(typeof(T).IsEnum);
            int id = Convert.ToInt32(msg);
            PostMsg(id, args);
        }

        public void PostMsg(int msg, params object[] args)
        {
            if (_fsm == null)
            {
                LOG.Error($"fsm is null, post msg {msg}");
                return;
            }

            _fsm.PostMsgWithoutLock(msg, args);
        }

        public bool CheckToPostMessage(int msg, out string reason, params object[] args)
        {
            if (!_fsm.FindTransition(_fsm.State, msg))
            {
                reason = $"{_fsm.Name} is in {StringFsmStatus} state，can not do {GetStringMessage(msg)}";
                return false;
            }

            _fsm.PostMsgWithoutLock(msg, args);
            reason = string.Empty;
            return true;
        }
    }


}