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

namespace DoAn.PLC
{
    public enum TagType
    {
        tagTypeBool=0,
        tagTypeByte,
        tagTypeShortInt,
        tagTypeUShortInt,
        tagTypeInt,
        tagTypeUInt,
        tagTypeLong,
        tagTypeULong,
        tagTypeFloat,
        tagTypeDouble
    }

    public enum TagAccessType
    {
        Monitor=0,
        CycleRead,
        ReadWrite
    }

    public class Tag
    {
        /// <summary>
        /// 所在主机名称
        /// </summary>
        public string HostName { get; set; }

        /// <summary>
        /// 所在主机IP
        /// </summary>
        public string HostIp { get; set; }

        /// <summary>
        /// 变量名称
        /// </summary>
        public string TagName { get; set; }

        /// <summary>
        /// 变量地址
        /// </summary>
        public string TagAddress { get; set; }

        /// <summary>
        /// 变量值，以字符串形式表达
        /// </summary>
        public string TagNewValue { get; set; }

        /// <summary>
        /// 变量值，读取的上一次值
        /// </summary>
        public string TagLastValue { get; set; }

        /// <summary>
        /// 变量访问类型
        /// </summary>
        public TagAccessType AccessType { get; set; }

        /// <summary>
        /// 数据类型
        /// </summary>
        public TagType tagType { get; set; }

        /// <summary>
        /// 连续读取变量的数目
        /// </summary>
        public int tagLen { get; set; }

        public bool CompareNewValueChange()
        {
            bool compareResult = false;
            if(!string.IsNullOrEmpty(this.TagNewValue))
            {
                if (!string.IsNullOrEmpty(this.TagLastValue))
                {
                    compareResult = !this.TagNewValue.Equals(this.TagLastValue);
                }
                else
                    compareResult = true;
            }
            return compareResult;
        }

        /// <summary>
        /// 字节数组类型，转换为字符串输出
        /// </summary>
        /// <returns></returns>
        public string ConvertByteToString()
        {
            if (string.IsNullOrEmpty(this.TagNewValue)) return string.Empty;

            string[] buffer = this.TagNewValue.Trim(new char[2] { '[', ']' }).Split(new char[] { ',' });
            int length = int.Parse(buffer[1]);

            if (length <= 0) return string.Empty;

            byte[] buff = new byte[length];
            for (int i = 0; i < length; i++)
            {
                buff[i] = byte.Parse(buffer[i + 2]);
            }

            return Encoding.ASCII.GetString(buff);
        }
    }
}