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

namespace WWPipeLine.Commons
{
    /// <summary>
    /// 编码转换类
    /// </summary>
    public class EncodeHelper
    {
        private EncodeHelper()
        {
        }

        #region 判断文件流是否为UTF8字符集

        /// <summary>
        /// 判断文件流是否为UTF8字符集
        /// </summary>
        /// <param name="sbInputStream">文件流</param>
        /// <returns>判断结果</returns>
        public static bool IsUTF8(FileStream sbInputStream)
        {
            int i;
            byte cOctets;  // octets to go in this UTF-8 encoded character
            byte chr;
            bool bAllAscii = true;
            long iLen = sbInputStream.Length;

            cOctets = 0;
            for (i = 0; i < iLen; i++)
            {
                chr = (byte)sbInputStream.ReadByte();

                if ((chr & 0x80) != 0) bAllAscii = false;

                if (cOctets == 0)
                {
                    if (chr >= 0x80)
                    {
                        do
                        {
                            chr <<= 1;
                            cOctets++;
                        }
                        while ((chr & 0x80) != 0);

                        cOctets--;
                        if (cOctets == 0) return false;
                    }
                }
                else
                {
                    if ((chr & 0xC0) != 0x80)
                    {
                        return false;
                    }
                    cOctets--;
                }
            }

            if (cOctets > 0)
            {
                return false;
            }

            if (bAllAscii)
            {
                return false;
            }

            return true;
        }

        #endregion 判断文件流是否为UTF8字符集

        #region GB2312转换成UTF-8

        /// <summary>
        /// 将GB2312转换成UTF-8
        /// </summary>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string GB2312ToUTF8(string content)
        {
            byte[] _byteData = GetDefaultByte(content);
            return Encoding.UTF8.GetString(_byteData);
        }

        #endregion GB2312转换成UTF-8

        #region 将字符串转换默认的Byte数组

        /// <summary>
        /// 将字符串转换默认的Byte数组
        /// </summary>
        /// <param name="content"></param>
        /// <returns></returns>
        public static byte[] GetDefaultByte(string content)
        {
            return Encoding.Default.GetBytes(content);
        }

        #endregion 将字符串转换默认的Byte数组

        #region 文件转化为Base64

        /// <summary>
        /// 文件转化为Base64
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <returns>Base64</returns>
        public string FileToBase64String(string path)
        {
            FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] buffer = new byte[fileStream.Length];
            fileStream.Read(buffer, 0, (int)fileStream.Length);
            fileStream.Close();
            fileStream.Dispose();
            MemoryStream memory = new MemoryStream(buffer);
            string base64 = Convert.ToBase64String(memory.ToArray());
            memory.Close();
            memory.Dispose();
            return base64;
        }

        #endregion 文件转化为Base64

        #region 图象转化为Base64

        /// <summary>
        /// 图象转化为Base64
        /// </summary>
        /// <param name="image">图象路径</param>
        /// <param name="format">图象格式</param>
        /// <returns>Base64</returns>
        //public string ImageToBase64String(Image image, ImageFormat format)
        //{
        //    MemoryStream memory = new MemoryStream();
        //    image.Save(memory, image.RawFormat);
        //    string base64 = Convert.ToBase64String(memory.ToArray());
        //    memory.Close();
        //    memory.Dispose();
        //    return base64;
        //}

        #endregion 图象转化为Base64

        #region Base64转化为图象

        /// <summary>
        ///  Base64转化为图象
        /// </summary>
        /// <param name="base64">Base64</param>
        /// <returns>图象</returns>
        //public Image ImageFromBase64String(string base64)
        //{
        //    MemoryStream memory = new MemoryStream(Convert.FromBase64String(base64));
        //    Image result = Image.FromStream(memory);
        //    memory.Close();
        //    memory.Dispose();
        //    return result;
        //}

        #endregion Base64转化为图象

        #region 图标转化为Base64

        /// <summary>
        /// 图标转化为Base64
        /// </summary>
        /// <param name="image">图标</param>
        /// <returns>Base64</returns>
        //public string IconToBase64String(Icon image)
        //{
        //    MemoryStream memory = new MemoryStream();
        //    image.Save(memory);
        //    string base64 = Convert.ToBase64String(memory.ToArray());
        //    memory.Close();
        //    memory.Dispose();
        //    return base64;
        //}

        #endregion 图标转化为Base64

        #region Base64转化为图标

        /// <summary>
        /// Base64转化为图标
        /// </summary>
        /// <param name="base64">Base64</param>
        /// <returns>图标</returns>
        //public Icon IconFromBase64String(string base64)
        //{
        //    MemoryStream memory = new MemoryStream(Convert.FromBase64String(base64));
        //    Icon result = new Icon(memory);
        //    memory.Close();
        //    memory.Dispose();
        //    return result;
        //}

        #endregion Base64转化为图标

        #region IP 协议采用统一的校验算法

        /// <summary>
        /// IP 协议采用统一的校验算法
        /// </summary>
        /// <param name="buffer">buffer数组为整个ip包数组，需要转换成UInt16[]</param>
        /// <param name="size">size为buffer数组的长度</param>
        /// <returns>结果为0则数据正确，不为0表示通讯出错</returns>
        public static UInt16 checksum(UInt16[] buffer, int size)
        {
            Int32 cksum = 0;
            int counter;
            counter = 0;
            while (size > 0)
            {
                UInt16 val = buffer[counter];
                cksum += Convert.ToInt32(buffer[counter]);
                counter += 1;
                size = -1;
            }
            cksum = (cksum >> 16) + (cksum & 0xffff);
            cksum += (cksum >> 16);
            return (UInt16)(~cksum);
        }

        #endregion IP 协议采用统一的校验算法

        #region 生成字符串的ascii代码

        ///   <summary>
        ///   生成字符串的ascii代码
        ///   </summary>
        ///   <param   name= "s_Chinese "> 中文字符串，可夹英文 </param>
        ///   <returns> </returns>
        public static string Gen_ASCII(string s_Chinese)
        {
            string str = "";
            for (int i = 0; i < s_Chinese.Length; i++)
            {
                char ch = s_Chinese[i];
                if ((ch != '\r') && (ch != '\n'))
                {
                    str = str + ((short)ch).ToString("X");
                }
            }

            return str;
        }

        ///   <summary>
        ///   生成字符串的ascii代码
        ///   </summary>
        ///   <param   name= "s_Chinese "> 中文字符串，可夹英文 </param>
        ///   <returns> </returns>
        public static string Get_ASCII(string s_Chinese)
        {
            string str = "";

            byte[] array = Encoding.ASCII.GetBytes(s_Chinese);
            for (int i = 0; i < array.Length; i++)
            {
                int asciicode = (int)(array[i]);
                if (asciicode > 63)
                {
                    asciicode -= 64;
                }
                else
                {
                    asciicode += 64;
                }
                str += Convert.ToString(asciicode);
            }

            return str;
        }

        ///   <summary>
        ///   生成ascii代码的字符串
        ///   </summary>
        ///   <param   name= "ByteArray">ascii代码 { 69, 110, 99, 111, 100, 105, 110, 103, 32, 83, 116, 114, 105, 110, 103, 46 }</param>
        ///   <returns> </returns>
        public static string Get_ASCII(byte[] ByteArray)
        {
            ASCIIEncoding AE = new ASCIIEncoding();
            string strAsc = AE.GetString(ByteArray);
            return strAsc;
        }

        #endregion 生成字符串的ascii代码

        #region 生成ascii代码的字符数组

        ///   <summary>
        ///   生成ascii代码的字符数组
        ///   </summary>
        ///   <param   name= "ByteArray">ascii代码 { 69, 110, 99, 111, 100, 105, 110, 103, 32, 83, 116, 114, 105, 110, 103, 46 }</param>
        ///   <returns> </returns>
        public static char[] Gen_ASCII(byte[] ByteArray)
        {
            ASCIIEncoding AE = new ASCIIEncoding();
            char[] CharArray = AE.GetChars(ByteArray);
            return CharArray;
        }

        #endregion 生成ascii代码的字符数组

        #region 字节数组转16进制字符串

        /// <summary>
        /// 字节数组转16进制字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static string byteToHexStr(byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr += bytes[i].ToString("X2") + " ";
                }
            }
            return returnStr;
        }

        /// <summary>
        /// 字节数组转16进制字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static string byteToHexStrTrim(byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr += bytes[i].ToString("X2");
                }
            }
            return returnStr;
        }

        #endregion 字节数组转16进制字符串

        #region 字符串转16进制字节数组

        /// <summary>
        /// 字符串转16进制字节数组
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static byte[] strToToHexByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

        #endregion 字符串转16进制字节数组

        #region 16进制字符串异或

        /// <summary>
        /// 16进制字符串异或
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static string str16Xor(string hexString)
        {
            string returnStr = "";
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte XorByte = 0;
            for (int i = 0; i < hexString.Length / 2; i++)
                XorByte ^= Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            byte[] strAry = Encoding.ASCII.GetBytes(XorByte.ToString("X"));
            returnStr = EncodeHelper.byteToHexStr(strAry);
            return returnStr;
        }

        #endregion 16进制字符串异或

        #region 转全角\半角的函数

        /// <summary>
        /// 转全角的函数(SBC case)
        ///
        ///任意字符串
        ///全角字符串
        ///
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns></returns>
        public static String ToSBC(String input)
        {
            // 半角转全角：
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i] == 32)
                {
                    c[i] = (char)12288;
                    continue;
                }
                if (c[i] < 127)
                    c[i] = (char)(c[i] + 65248);
            }
            return new String(c);
        }

        /// <summary>
        ///
        /// 转半角的函数(DBC case)
        ///
        ///任意字符串
        ///半角字符串
        ///
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static String ToDBC(String input)
        {
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i] == 12288)
                {
                    c[i] = (char)32;
                    continue;
                }
                if (c[i] > 65280 && c[i] < 65375)
                    c[i] = (char)(c[i] - 65248);
            }
            return new String(c);
        }

        #endregion 转全角\半角的函数

        #region 是否全角\半角

        /// <summary>
        /// 是否全角的函数(SBC case)
        ///
        ///任意字符串
        ///全角字符串
        ///
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns></returns>
        public static bool IsSBC(string input)
        {
            if (2 * input.Length == Encoding.Default.GetByteCount(input))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// 是否半角的函数(DBC case)
        ///
        ///任意字符串
        ///全角字符串
        ///
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns></returns>
        public static bool IsDBC(string input)
        {
            if (input.Length == Encoding.Default.GetByteCount(input))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        #endregion 是否全角\半角

        #region 转换Image到byte[] 数组

        ///// <summary>
        ///// 转换Image到byte[] 数组
        ///// </summary>
        ///// <param name="imageIn">Image</param>
        ///// <returns>byte[] 数组</returns>
        //public static byte[] imageToByteArray(System.Drawing.Image imageIn)
        //{
        //    MemoryStream ms = new MemoryStream();
        //    imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        //    byte[] returnBuffer = new byte[ms.Length];
        //    ms.Read(returnBuffer, 0, int.Parse(ms.Length.ToString()));
        //    //清空和释放内存流
        //    ms.Close();
        //    ms.Dispose();
        //    return returnBuffer;
        //}

        #endregion 转换Image到byte[] 数组

        #region 转换byte[]到Image

        ///// <summary>
        ///// 转换byte[]到Image
        ///// </summary>
        ///// <param name="imageIn">byte[] 数组</param>
        ///// <returns>Image</returns>
        //public static Image byteArrayToImage(byte[] byteArrayIn)
        //{
        //    MemoryStream ms = new MemoryStream(byteArrayIn);
        //    Image returnImage = Image.FromStream(ms);
        //    ms.Close();
        //    ms.Dispose();
        //    return returnImage;
        //}

        #endregion 转换byte[]到Image

        #region 将字节数组转换成字符串

        /// <summary>
        /// 将字节数组转换成字符串
        /// </summary>
        /// <param name = "b">字节数组</param>
        /// <returns>返回转换后的字符串</returns>
        public static string byteToString(byte[] b)
        {
            Encoding enc = Encoding.GetEncoding("GB2312");
            string str = enc.GetString(b);
            str = str.Substring(0, str.IndexOf('\0') >= 0 ? str.IndexOf('\0') : str.Length);//去掉无用字符
            return str;
        }

        #endregion 将字节数组转换成字符串

        #region 编码方式转换

        public static string StringToBitString(string input)
        {
            return StringToBitString(input, Encoding.Default);
        }

        public static string StringToBitString(string input, Encoding encoding)
        {
            byte[] stringBytes = encoding.GetBytes(input);
            StringBuilder result = new StringBuilder(stringBytes.Length * 8);

            foreach (byte b in stringBytes)
            {
                for (int i = 128; i > 0; i /= 2)
                {
                    result.Append(((b & i) == 0) ? 0 : 1);
                }
            }
            return result.ToString();
        }

        public static string BitStringToString(string input)
        {
            return BitStringToString(input, Encoding.Default);
        }

        public static string BitStringToString(string input, Encoding encoding)
        {
            List<byte> byteArray = new List<byte>();

            byte temp = 0;
            for (int i = 0, j = 0; i < input.Length; i++)
            {
                if (input[i] == '1') temp |= (byte)(1 << (8 - i % 8 - 1));

                if (++j == 8)
                {
                    byteArray.Add(temp);
                    temp = 0;
                    j = 0;
                }
            }

            string result = new string(encoding.GetChars(byteArray.ToArray()));

            return result;
        }

        #endregion 编码方式转换

        #region int byte 互转

        /// <summary>
        /// byte 转int
        /// </summary>
        /// <param name="bytesData"></param>
        /// <returns></returns>
        public static int BytesToInt(byte[] bytesData)
        {
            int num = 0;
            for (int i = 0; i < bytesData.Length; i++)
            {
                num += bytesData[i] << (8 * i);
            }
            return num;
        }

        /// <summary>
        /// bytes转int
        /// </summary>
        /// <param name="bytesData">自己数据</param>
        /// <param name="offset">偏移量</param>
        /// <param name="length">字节长度最大为4最小为1,如果length 大于4或小于1 内部赋值为2</param>
        /// <returns>int值</returns>
        public static int BytesToInt(byte[] bytesData, int offset, int length = 4)
        {
            int num = 0;
            if (length < 1 || length > 4)
            {
                length = 2;
            }
            for (int i = 0; i < length; i++)
            {
                num += bytesData[i + offset] << (8 * i);
            }
            return num;
        }

        /// <summary>
        /// int转byte
        /// </summary>
        /// <param name="data"></param>
        /// <param name="length">字节长度最大为4最小为1,如果length 大于4或小于1 内部赋值为2</param>
        /// <returns></returns>
        public static byte[] IntToBytes(int data, int length = 4)
        {
            if (length < 1 || length > 4)
            {
                length = 2;
            }
            byte[] buffer = new byte[length];
            for (int i = 0; i < length; i++)
            {
                buffer[i] = (byte)(data >> (i * 8));
            }
            return buffer;
        }

        #endregion int byte 互转

        #region Color 转为short

        /// <summary>
        /// 将Color转为Short类型
        /// </summary>
        /// <param name="color"></param>
        /// <returns></returns>
        //public static short ColorToShort(Color color)
        //{
        //    return (short)(((color.R & 0xf8) << 8)
        //             | ((color.G & 0xfc) << 3)
        //             | ((color.B & 0xf8) >> 3));//红高5，绿高6，蓝高5
        //}

        #endregion Color 转为short
    }
}