using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using GSG.NET.Concurrent;
using GSG.NET.Logging;
using GSG.NET.Utils;
using OHV.Common.Events;
using OHV.Common.Model;
using OHV.SqliteDAL;
using Prism.Events;

namespace VehicleControlSystem.Managers
{
    public class Scheduler : IDisposable
    {
        static Logger logger = Logger.GetLogger();

        private List<Command> commands;

        public List<Command> CommandsList
        {
            get { return commands; }
            set { commands = value; }
        }

        Thread thread = null;
        bool isThreadAlive = false;

        IEventAggregator eventAggregator;
        AutoManager autoManager;
        SqliteManager sql = null;

        public Scheduler(IEventAggregator ea, AutoManager autoManager, SqliteManager sqlite)
        {
            this.CommandsList = new List<Command>();
            eventAggregator = ea;// CommonServiceLocator.ServiceLocator.Current.GetInstance<IEventAggregator>();
            eventAggregator.GetEvent<VCSMessagePubSubEvent>().Subscribe(OnReceivedMessageEvent);

            this.autoManager = autoManager;
            this.sql = sqlite;
        }

        private void OnReceivedMessageEvent(VCSMessageEventArgs obj)
        {
            this.AddCommand(obj.Command);

            //var m = new GUIMessageEventArgs() { MessageText = obj.MessageText, MessageKey = obj.MessageKey };
            //m.Command = ObjectCopyUtils.DeepClone(obj.Command);
            //GUIMessagePublish(m);
        }

        void GUIMessagePublish(GUIMessageEventArgs args)
        {
            eventAggregator.GetEvent<GUIMessagePubSubEvent>().Publish(args);
        }

        public void Init()
        {
            this.isThreadAlive = true;
            this.thread = ThreadUtils.Invoke(this.ExcuteCommand);
        }

        public bool AddCommand(Command cmd)
        {
            if (this.CommandsList == null) return false;
            try
            {
	            this.CommandsList.Add(cmd);
            }
            catch (Exception ex)
            {
                logger.E(ex);
                return false;
            }

            return true;
        }

        bool RemoveCommand(Command cmd)
        {
            if (!this.CommandsList.Remove(cmd))
            {
                logger.D($"Scheduler - [Command] : RemoveCommand fail ID-{cmd.CommandID} / Result-{cmd.Result} ");
                return false;
            }

            logger.D($"Scheduler - [Command] : RemoveCommand OK ID-{cmd.CommandID} / Result-{cmd.Result} ");
            return true;
        }

        void ExcuteCommand()
        {
            while (isThreadAlive)
            {
                Thread.Sleep(500);
                try
                {
                    var state = this.autoManager.AutoModeStateProperty;
                    switch (state)
                    {
                        case OHV.Common.Shareds.eAutoModeState.ErrorStop:
                            break;
                        case OHV.Common.Shareds.eAutoModeState.StartRun:
                            break;
                        case OHV.Common.Shareds.eAutoModeState.Run:
                            {
                                Command cmd = sql.CommandDAL.GetCmd();
                                if (cmd == null) continue;

                                DoWork(cmd);
                            }
                            break;
                        case OHV.Common.Shareds.eAutoModeState.Stop:
                            break;
                        default:
                            break;
                    }
                }
                catch (Exception ex)
                {
                    logger.E(ex);
                }
            }
        }

        private void DoWork(Command cmd)
        {
            switch (cmd.State)
            {
                case OHV.Common.Shareds.eCommandState.Queued:
                    if (sql.SubCmdDAL.Count <= 0)
                    {
                        switch (cmd.Type)
                        {
                            case OHV.Common.Shareds.eCommandType.Move:
                            case OHV.Common.Shareds.eCommandType.MoveNLoad:
                            case OHV.Common.Shareds.eCommandType.MoveNUnload:
                                CreateSubCommand(cmd, SubCmd.eType.Move);
                                break;
                            case OHV.Common.Shareds.eCommandType.Charging:
                                break;
                            default:
                                break;
                        }
                    }
                    sql.CommandDAL.UpdateState(cmd.CommandID, OHV.Common.Shareds.eCommandState.Assign);
                    break;

                case OHV.Common.Shareds.eCommandState.Assign: //Assign 되면 Vehicle 의 상태가 Busy 면 Processing 으로 전환.
                    { 
                        var subCmd = sql.SubCmdDAL.GetSubCmd();
                        if (subCmd == null) break;

                        if (!subCmd.CmdID.Equals(cmd.CommandID))
                            break;
                    }

                    sql.CommandDAL.UpdateState(cmd.CommandID, OHV.Common.Shareds.eCommandState.Processing);
                    break;

                case OHV.Common.Shareds.eCommandState.Processing:
                    {
                        var subCmd = sql.SubCmdDAL.GetSubCmd();
                        if (subCmd == null) // Move 명령을 수행 완료 했다고 판단.
                        {
                            if ( cmd.IsSecondCommanded)
                            {
                                sql.CommandDAL.UpdateState(cmd.CommandID, OHV.Common.Shareds.eCommandState.Complete);
                                break;
                            }

                            if (cmd.Type == OHV.Common.Shareds.eCommandType.MoveNLoad )
                            {
                                if (this.CreateSubCommand(cmd, SubCmd.eType.Load))
                                    cmd.IsSecondCommanded = true;
                                break;
                            }
                            else if(cmd.Type == OHV.Common.Shareds.eCommandType.MoveNUnload)
                            {
                                if (this.CreateSubCommand(cmd, SubCmd.eType.Unload))
                                    cmd.IsSecondCommanded = true;
                                break;
                            }
                            else if ( cmd.Type == OHV.Common.Shareds.eCommandType.Charging)
                            {
                                if ( this.CreateSubCommand(cmd, SubCmd.eType.Chaging))
                                    cmd.IsSecondCommanded = true;
                                break;
                            }
                            else //Move Command
                            {
                                sql.CommandDAL.UpdateState(cmd.CommandID, OHV.Common.Shareds.eCommandState.Complete);
                                break;
                            }
                        }

                        if (subCmd.CmdID.Equals(cmd.CommandID)) //진행중 판단
                            break;
                        else //다른 아이디의 일을 하고 있을 경우 가 생길까??
                        { }
                    }
                    sql.CommandDAL.UpdateState(cmd.CommandID, OHV.Common.Shareds.eCommandState.Complete);
                    break;

                case OHV.Common.Shareds.eCommandState.Complete:
                    sql.CommandDAL.Delete(cmd);
                    break;
                default:
                    break;
            }
        }

        private bool CreateSubCommand(Command cmd, SubCmd.eType type)
        {
            //명령을 만들기 전에 Vehicle 의 상태를 확인하여 만들자.
            switch (type)
            {
                case SubCmd.eType.Move:
                    break;
                case SubCmd.eType.Load:
                    break;
                case SubCmd.eType.Unload:
                    break;
                case SubCmd.eType.Chaging:
                    break;
                default:
                    break;
            }

            var sub = new SubCmd
            {
                CmdType = SubCmd.eCmdType.Auto,
                Type = type,
                TargetID = cmd.TargetID,
                CmdID = cmd.CommandID,
            };
            sql.SubCmdDAL.Add(sub);
            logger.I($"{sub.ID} Sub Command Create - Type={sub.Type}, TargetID={sub.TargetID}, CommandID={sub.CmdID}");

            return true;
        }

        public bool CreateTransferCommand()
        {
            Command cmd = new Command
            {
            };

            sql.CommandDAL.Add(cmd);
            logger.I($"{cmd.CommandID} Command Create - Type={cmd.Type}, TargetID={cmd.TargetID}");
            return true;
        }

        #region IDisposable Support
        private bool disposedValue = false; // 중복 호출을 검색하려면

        protected virtual void Dispose(bool disposing)
        {
            if (!disposedValue)
            {
                if (disposing)
                {
                    // TODO: 관리되는 상태(관리되는 개체)를 삭제합니다.
                    this.isThreadAlive = false;
                    if ( !this.thread.Join(3000) )
                        ThreadUtils.Kill(this.thread);
                }

                // TODO: 관리되지 않는 리소스(관리되지 않는 개체)를 해제하고 아래의 종료자를 재정의합니다.
                // TODO: 큰 필드를 null로 설정합니다.

                disposedValue = true;
            }
        }

        // TODO: 위의 Dispose(bool disposing)에 관리되지 않는 리소스를 해제하는 코드가 포함되어 있는 경우에만 종료자를 재정의합니다.
        // ~Scheduler()
        // {
        //   // 이 코드를 변경하지 마세요. 위의 Dispose(bool disposing)에 정리 코드를 입력하세요.
        //   Dispose(false);
        // }

        // 삭제 가능한 패턴을 올바르게 구현하기 위해 추가된 코드입니다.
        public void Dispose()
        {
            // 이 코드를 변경하지 마세요. 위의 Dispose(bool disposing)에 정리 코드를 입력하세요.
            Dispose(true);
            // TODO: 위의 종료자가 재정의된 경우 다음 코드 줄의 주석 처리를 제거합니다.
            // GC.SuppressFinalize(this);
        }
        #endregion
    }
}