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

namespace NSAnalysis
{
    public class PlcWriteObj
    {
        public object WriteAddr;
        public object WriteValue;
        public int    WriteLength;  //长度，主要针对字符串
        /// <summary>
        /// 0=int, 1= float, 2=double, 3=string
        /// </summary>
        public int DataType = 0;

        public PlcWriteObj()
        {
            WriteAddr = null;
            WriteValue = null;
            WriteLength = -1;
        }
    }

    public class PlcWriteManager
    {
        private List<PlcWriteObj> LstPLcWrite = new List<PlcWriteObj>();
        private static readonly object sync = new object();
        private static PlcWriteManager _this = null;
        public static PlcWriteManager Instance
        {
            get
            {
                if (_this == null)
                {
                    lock (sync)
                    {
                        if (_this == null)
                        {
                            _this = new PlcWriteManager();
                        }
                    }
                }
                return _this;
            }
        }

        public PlcWriteManager()
        {

        }

        public PlcWriteObj OutQueue()
        {
            try
            {
                PlcWriteObj ccmdObj = null;
                lock (this)
                {
                    if (LstPLcWrite != null && LstPLcWrite.Count > 0)
                    {
                        ccmdObj = new PlcWriteObj();
                        ccmdObj = LstPLcWrite[0];
                        LstPLcWrite.RemoveAt(0);
                    }
                }
                return ccmdObj;
            }
            catch
            {
                throw;
            }        
        }

        public void RemoveQueueTop()
        {
            if (LstPLcWrite != null && LstPLcWrite.Count > 0)
            {
                LstPLcWrite.RemoveAt(0);
            }
        }

        public void InsertQueue(PlcWriteObj data)
        {
           lock (this)
            {
                 LstPLcWrite.Add(data);
            }
        }

        public bool isExitData()
        {
           lock (this)
            {
                return LstPLcWrite.Count > 0;
            }
        }

        public static void WritePlc(object Addr, object Value, int DataType)
        {
            PlcWriteObj m_DataObj = new PlcWriteObj();
            m_DataObj.WriteAddr = Addr;
            m_DataObj.WriteValue = Value;
            m_DataObj.DataType = DataType;
            Instance.InsertQueue(m_DataObj);
        }
    }
}