using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Text;
using System.Linq;
using System.Security.Cryptography;

namespace WWPipeLine.Commons
{
	public class StringEx
	{
		///<summary>
		///生成随机字符串
		///</summary>
		///<param name="length">目标字符串的长度</param>
		///<param name="useNum">是否包含数字，1=包含，默认为包含</param>
		///<param name="useLow">是否包含小写字母，1=包含，默认为包含</param>
		///<param name="useUpp">是否包含大写字母，1=包含，默认为包含</param>
		///<param name="useSpe">是否包含特殊字符，1=包含，默认为不包含</param>
		///<param name="custom">要包含的自定义字符，直接输入要包含的字符列表</param>
		///<returns>指定长度的随机字符串</returns>
		public static string GetRandomString(int length, bool useNum, bool useLow, bool useUpp, bool useSpe, string custom)
		{
			byte[] b = new byte[4];
			new System.Security.Cryptography.RNGCryptoServiceProvider().GetBytes(b);
			Random r = new Random(BitConverter.ToInt32(b, 0));
			string s = null, str = custom;
			if (useNum == true) { str += "0123456789"; }
			if (useLow == true) { str += "abcdefghijklmnopqrstuvwxyz"; }
			if (useUpp == true) { str += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; }
			if (useSpe == true) { str += "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"; }
			for (int i = 0; i < length; i++)
			{
				s += str.Substring(r.Next(0, str.Length - 1), 1);
			}
			return s;
		}

		/// <summary>
		/// 字符串压缩
		/// </summary>
		/// <param name="strSource"></param>
		/// <returns></returns>
		public static byte[] Compress(byte[] data)
		{
			try
			{
				MemoryStream ms = new MemoryStream();
				GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true);
				zip.Write(data, 0, data.Length);
				zip.Close();
				byte[] buffer = new byte[ms.Length];
				ms.Position = 0;
				ms.Read(buffer, 0, buffer.Length);
				ms.Close();
				return buffer;
			}
			catch (Exception e)
			{
				throw new Exception(e.Message);
			}
		}

		/// <summary>
		/// 字符串解压缩
		/// </summary>
		/// <param name="strSource"></param>
		/// <returns></returns>
		public static byte[] Decompress(byte[] data)
		{
			try
			{
				MemoryStream ms = new MemoryStream(data);
				GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true);
				MemoryStream msreader = new MemoryStream();
				byte[] buffer = new byte[0x1000];
				while (true)
				{
					int reader = zip.Read(buffer, 0, buffer.Length);
					if (reader <= 0)
					{
						break;
					}
					msreader.Write(buffer, 0, reader);
				}
				zip.Close();
				ms.Close();
				msreader.Position = 0;
				buffer = msreader.ToArray();
				msreader.Close();
				return buffer;
			}
			catch (Exception e)
			{
				throw new Exception(e.Message);
			}
		}

		public static string CompressString(string str)
		{
			string compressString = "";
			byte[] compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);
			byte[] compressAfterByte = Compress(compressBeforeByte);
			//compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);
			compressString = Convert.ToBase64String(compressAfterByte);
			return compressString;
		}

		public static string DecompressString(string str)
		{
			string compressString = "";
			//byte[] compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);
			byte[] compressBeforeByte = Convert.FromBase64String(str);
			byte[] compressAfterByte = Decompress(compressBeforeByte);
			compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);
			return compressString;
		} 
		public static string[] setToLower(List<string> listStr)
		{
			if (listStr is null) return new string[] { "" };
			List<string> strList = new List<string>();
			foreach (string s in listStr.ToArray())
			{
				strList.Add(s.ToLower());
			}
			return strList.ToArray();
		}
		public static string[] setToLower(string[] listStr)
		{
			if (listStr is null) return new string[] { "" };
			List<string> strList = new List<string>();
			foreach (string s in listStr)
			{
				strList.Add(s.ToLower());
			}
			return strList.ToArray();
		}
		public static List<string> setToLowerList(List<string> listStr)
		{
			List<string> strList = new List<string>();
			foreach (string s in listStr.ToArray())
			{
				strList.Add(s.ToLower());
			}
			return strList;
		}
		
	}
}