using System;
using System.Text.RegularExpressions;

namespace EC.Utils
{
	public class CommonUtil
	{
		/// <summary>
		/// 返回UnixTime 单位秒
		/// </summary>
		/// <returns>单位秒</returns>
		public static int NowUnixTime()
		{
			long longunixtime = DateUnit.UnixTime() / 1000;
			return FormatCom.ToInt(longunixtime.ToString());
		}

		/// <summary>
		/// 将 DateTime 转换为 UnixTime 单位秒
		/// </summary>
		/// <param name="dateTime"></param>
		/// <returns></returns>
		public static int DateTimeToUnixTime(DateTime dateTime)
		{
			return (int)(dateTime - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1))).TotalSeconds;
		}

		/// <summary>
		/// 将 UnixTime 转换为 DateTime 单位秒
		/// </summary>
		/// <param name="time"></param>
		/// <returns></returns>
		public static DateTime UnixTimeToDateTime(int time)
		{
			if (time < 0)
				throw new ArgumentOutOfRangeException("time is out of range");
			return TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1)).AddSeconds(time);
		}

		/// <summary>
		/// 小数字符串去零
		/// </summary>
		/// <param name="str"></param>
		/// <returns></returns>
		public static string Trim0(string str)
		{
			string result = str.TrimEnd('0');
			if (result.EndsWith("."))
			{
				result = result.Remove(result.Length - 1);
			}
			return result;
		}

		/// <summary>
		/// 判断车牌是否正确
		/// </summary>
		/// <param name="plate"></param>
		/// <returns></returns>
		public static bool IsSuccessPlate(string plate)
		{
			int len = plate.Length;
			if (len == 7)
			{
				if (plate[0] > 127)
				{//汉字
					for (int i = 1; i < 7; i++)
					{
						if (plate[i] > 127)
						{
							return false;
						}
					}
					return true;
				}
			}
			return false;
		}

		/// <param name="str">要舍入的字符串小数</param>
		public static decimal StrToDec(string str)
		{
			try
			{
				return !string.IsNullOrEmpty(str) ? Convert.ToDecimal(str.Trim()) : 0m;
			}
			catch (Exception)
			{
				return 0m;
			}
		}

		/// <summary>
		///
		/// </summary>
		/// <param name="dec"></param>
		/// <param name="afterLimit"></param>
		/// <param name="patch"># or 0</param>
		/// <returns></returns>
		public static string WeightDecToStr(decimal dec, int afterLimit = 3, char patch = '#')
		{
			return dec.ToString("0.".PadRight(afterLimit + 2, patch));
		}

		/// <param name="str">要舍入的字符串小数</param>
		/// <param name="afterLimit">指定数字要舍入到的小数位数的值，范围从 0 到 28。</param>
		public static decimal WeightStrToDec(string str, int afterLimit = 3)
		{
			try
			{
				return Math.Round(Convert.ToDecimal(str), afterLimit);
			}
			catch (Exception)
			{
				return 0m;
			}
		}

		public static string Reverse(string original)
		{
			var arr = original.ToCharArray();
			Array.Reverse(arr);
			return new string(arr);
		}

		public static bool IsNumber(string value)
		{
			return Regex.IsMatch(value, @"^[-+]?\d+(\.\d+)?$");
		}

		public static bool IsInt(string value)
		{
			return Regex.IsMatch(value, @"^[-+]?\d+(\.\d+)?$");
		}

		/// <summary>
		/// 在指定时间过后执行指定的表达式
		/// </summary>
		/// <param name="action">要执行的表达式</param>
		/// <param name="interval">时间（以毫秒为单位）</param>
		/// <return>返回timer对象</return>
		public static void SetTimeout(Action action, double interval)
		{
			var timer = new System.Timers.Timer(interval);
			timer.Elapsed += (sender, e) =>
			{
				timer.Enabled = false;
				action();
				timer.Dispose();
				timer.Close();
				timer = null;
			};
			timer.Enabled = true;
		}

		/// <summary>
		/// 在指定时间周期重复执行指定的表达式
		/// </summary>
		/// <param name="action">要执行的表达式</param>
		/// <param name="interval">时间（以毫秒为单位）</param>
		public static void SetInterval(Action action, double interval)
		{
			var timer = new System.Timers.Timer(interval);
			timer.Elapsed += (sender, e) => { action(); };
			timer.Enabled = true;
		}

		///<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>
		///<returns>指定长度的随机字符串</returns>
		public static string GetRandomString(int length, bool useNum = true, bool useLow = true, bool useUpp = true, bool useSpe = true)
		{
			var b = new byte[4];
			new System.Security.Cryptography.RNGCryptoServiceProvider().GetBytes(b);
			var r = new Random(BitConverter.ToInt32(b, 0));
			string s = string.Empty, str = string.Empty;
			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;
		}
	}
}