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

namespace IStation.DataDockingSocket
{
    /// <summary>
    /// 处理数据辅助类
    /// </summary>
    internal class HandleDataHelper
    {
        /// <summary>
        /// 处理数据
        /// </summary>
        public static List<Model.MonitorDataDockingSrcRecord> HandleData
            (
                InstructionItem item,
                byte[] bts
            )
        {
            var list = new List<Model.MonitorDataDockingSrcRecord>();

            //将指令转化为字节数组
            var instrution_bts = BitTransfer.FromString(item.Instruction);
            //请求数据的索引器位置 从0开始
            var startIndex = instrution_bts[2] * 16 * 16 + instrution_bts[3];

            foreach (var x in item.RuleItems)
            {
                var record = new Model.MonitorDataDockingSrcRecord();
                record.SignId = x.SignId;
                record.RecordType = Model.eMonitorType.General;
                record.SrcTime = DateTime.Now;
                record.SrcValue = null;

                var skip = 3 + (x.Index - startIndex - 1) * 2;
                switch (x.Rule)
                {
                    case eRule.Float:
                        {
                            var btValue = bts.Skip(skip).Take(2 * 2).ToArray();
                            var value = CalcuFloat(btValue) * x.Ratio;
                            record.SrcValue = value.ToString();
                        }
                        break;
                    case eRule.Short:
                        {
                            var btValue = bts.Skip(skip).Take(2).ToArray();
                            var value = CalcuShort(btValue) * x.Ratio;
                            record.SrcValue = value.ToString();
                        }
                        break;
                    case eRule.Int:
                        {
                            var btValue = bts.Skip(skip).Take(2 * 2).ToArray();
                            var value = CalcuInt(btValue) * x.Ratio;
                            record.SrcValue = value.ToString();
                        }
                        break;
                    default: break;
                }
                list.Add(record);
            }

            return list;
        }

        //计算Float
        private static float CalcuFloat(byte[] bts)
        {
            if (bts.Length != 4)
                return default;
            var rbts = bts.Reverse().ToArray();
            return BitConverter.ToSingle(rbts, 0);
        }

        //计算Short
        private static short CalcuShort(byte[] bts)
        {
            if (bts.Length != 2)
                return default;
            var rbts = bts.Reverse().ToArray();
            return BitConverter.ToInt16(rbts, 0);
        }

        //计算Int
        private static int CalcuInt(byte[] bts)
        {
            if (bts.Length != 4)
                return default;
            var rbts = bts.Reverse().ToArray();
            return BitConverter.ToInt32(rbts, 0);
        }


    }
}