using System;

using System.Collections.Generic;
using System.Text;

namespace Curtain.Net.Sockets.PLC
{
    /// <summary>
    /// 转换工具类
    /// </summary>
    public static class ConvertTool
    {
        #region Siemens S7
        /// <summary>
        /// 16进制字符转byte[]
        /// </summary>
        /// <param name="hex"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public static byte[] HexStrToBytes(string hex, int length = 2)
        {
            if (string.IsNullOrWhiteSpace(hex))
            {
                return null;
            }
            if (hex.IndexOf(' ') > 0)
            {
                hex = hex.Replace(" ", "");
            }
            int i = 0;
            List<byte> bbs = new List<byte>();
            while (i < hex.Length)
            {
                bbs.Add(Convert.ToByte(hex.Substring(i, length), 16));
                i += length;
            }
            return bbs.ToArray();
        }

        /// <summary>
        /// byte[]转16进制字符
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public static string BytesToHexStr(byte[] bytes, int length = 2)
        {
            if (bytes == null || bytes.Length == 0)
            {
                return null;
            }
            StringBuilder sb = new StringBuilder();
            foreach (byte item in bytes)
            {
                sb.Append(ByteToHexStr(item, length));
            }
            return sb.ToString();
        }

        /// <summary>
        /// byte转16进制字符
        /// </summary>
        /// <param name="item"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public static string ByteToHexStr(byte item, int length = 2)
        {
            return Convert.ToString(item, 16).ToUpper().PadLeft(length, '0');
        }

        /// <summary>
        /// bool[]转byte[]
        /// 8个bool合成一个byte
        /// Siemens S7
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static byte[] BoolsToBytes(bool[] data)
        {
            if (data == null)
            {
                return null;
            }
            List<byte> bytes = new List<byte>();
            for (int i = 0; i < data.Length; i += 8)
            {
                byte item = 0;
                for (int j = 0; j < 8 && i+j< data.Length; j++)
                {
                    if (data[i + j])
                    {
                        item += (byte)Math.Pow(2, j);
                    }
                }
                bytes.Add(item);
            }
            return bytes.ToArray();
        }

        /// <summary>
        /// byte[]转bool[]
        /// 一个byte拆成8个bool
        /// Siemens S7
        /// </summary>
        /// <param name="data"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public static bool[] BytesToBools(byte[] data, int length)
        {
            if (data == null)
            {
                return null;
            }
            List<bool> bools = new List<bool>();
            foreach (byte item in data)
            {
                char[] cs = Convert.ToString(item, 2).ToCharArray();
                Array.Reverse(cs);
                int count = Math.Min(8, length);
                length -= 8;
                bool[] bs = new bool[count];
                for (int i = 0; i < count && i< cs.Length; i++)
                {
                    bs[i] = (cs[i] == '1');
                }
                bools.AddRange(bs);
            }
            return bools.ToArray();
        }
        #endregion
    }
}