using Microsoft.VisualBasic;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace EC.Utils
{
	/// <summary>
	/// 字符串操作 - 工具方法
	/// </summary>
	public sealed partial class Str
	{
		#region Empty(空字符串)

		/// <summary>
		/// 空字符串
		/// </summary>
		public static string Empty
		{
			get { return string.Empty; }
		}

		#endregion Empty(空字符串)

		#region PinYin(获取汉字的拼音简码)

		/// <summary>
		/// 使用字符编码方式获取拼音简码
		/// </summary>
		private static string ResolvePinYinByCode(ushort unicode)
		{
			if (unicode >= '\uB0A1' && unicode <= '\uB0C4')
				return "A";
			if (unicode >= '\uB0C5' && unicode <= '\uB2C0' && unicode != 45464)
				return "B";
			if (unicode >= '\uB2C1' && unicode <= '\uB4ED')
				return "C";
			if (unicode >= '\uB4EE' && unicode <= '\uB6E9')
				return "D";
			if (unicode >= '\uB6EA' && unicode <= '\uB7A1')
				return "E";
			if (unicode >= '\uB7A2' && unicode <= '\uB8C0')
				return "F";
			if (unicode >= '\uB8C1' && unicode <= '\uB9FD')
				return "G";
			if (unicode >= '\uB9FE' && unicode <= '\uBBF6')
				return "H";
			if (unicode >= '\uBBF7' && unicode <= '\uBFA5')
				return "J";
			if (unicode >= '\uBFA6' && unicode <= '\uC0AB')
				return "K";
			if (unicode >= '\uC0AC' && unicode <= '\uC2E7')
				return "L";
			if (unicode >= '\uC2E8' && unicode <= '\uC4C2')
				return "M";
			if (unicode >= '\uC4C3' && unicode <= '\uC5B5')
				return "N";
			if (unicode >= '\uC5B6' && unicode <= '\uC5BD')
				return "O";
			if (unicode >= '\uC5BE' && unicode <= '\uC6D9')
				return "P";
			if (unicode >= '\uC6DA' && unicode <= '\uC8BA')
				return "Q";
			if (unicode >= '\uC8BB' && unicode <= '\uC8F5')
				return "R";
			if (unicode >= '\uC8F6' && unicode <= '\uCBF9')
				return "S";
			if (unicode >= '\uCBFA' && unicode <= '\uCDD9')
				return "T";
			if (unicode >= '\uCDDA' && unicode <= '\uCEF3')
				return "W";
			if (unicode >= '\uCEF4' && unicode <= '\uD188')
				return "X";
			if (unicode >= '\uD1B9' && unicode <= '\uD4D0')
				return "Y";
			if (unicode >= '\uD4D1' && unicode <= '\uD7F9')
				return "Z";
			return string.Empty;
		}

		#endregion PinYin(获取汉字的拼音简码)

		#region Splice(拼接集合元素)

		/// <summary>
		/// 拼接集合元素
		/// </summary>
		/// <typeparam name="T">集合元素类型</typeparam>
		/// <param name="list">集合</param>
		/// <param name="quotes">引号，默认不带引号，范例：单引号 "'"</param>
		/// <param name="separator">分隔符，默认使用逗号分隔</param>
		public static string Splice<T>(IEnumerable<T> list, string quotes = "", string separator = ",")
		{
			if (list == null)
				return string.Empty;
			var result = new StringBuilder();
			foreach (var each in list)
				result.AppendFormat("{0}{1}{0}{2}", quotes, each, separator);
			return result.ToString().TrimEnd(separator.ToCharArray());
		}

		#endregion Splice(拼接集合元素)

		#region FirstUpper(将值的首字母大写)

		/// <summary>
		/// 将值的首字母大写
		/// </summary>
		/// <param name="value">值</param>
		public static string FirstUpper(string value)
		{
			string firstChar = value.Substring(0, 1).ToUpper();
			return firstChar + value.Substring(1, value.Length - 1);
		}

		#endregion FirstUpper(将值的首字母大写)

		#region ToCamel(将字符串转成驼峰形式)

		/// <summary>
		/// 将字符串转成驼峰形式
		/// </summary>
		/// <param name="value">原始字符串</param>
		public static string ToCamel(string value)
		{
			return FirstUpper(value.ToLower());
		}

		#endregion ToCamel(将字符串转成驼峰形式)

		#region ContainsChinese(是否包含中文)

		/// <summary>
		/// 是否包含中文
		/// </summary>
		/// <param name="text">文本</param>
		public static bool ContainsChinese(string text)
		{
			const string pattern = "[\u4e00-\u9fa5]+";
			return Regex.IsMatch(text, pattern);
		}

		#endregion ContainsChinese(是否包含中文)

		#region ContainsNumber(是否包含数字)

		/// <summary>
		/// 是否包含数字
		/// </summary>
		/// <param name="text">文本</param>
		public static bool ContainsNumber(string text)
		{
			const string pattern = "[0-9]+";
			return Regex.IsMatch(text, pattern);
		}

		#endregion ContainsNumber(是否包含数字)

		#region Distinct(去除重复)

		/// <summary>
		/// 去除重复
		/// </summary>
		/// <param name="value">值，范例1："5555",返回"5",范例2："4545",返回"45"</param>
		public static string Distinct(string value)
		{
			var array = value.ToCharArray();
			return new string(array.Distinct().ToArray());
		}

		#endregion Distinct(去除重复)

		#region Truncate(截断字符串)

		/// <summary>
		/// 截断字符串
		/// </summary>
		/// <param name="text">文本</param>
		/// <param name="length">返回长度</param>
		/// <param name="endCharCount">添加结束符号的个数，默认0，不添加</param>
		/// <param name="endChar">结束符号，默认为省略号</param>
		public static string Truncate(string text, int length, int endCharCount = 0, string endChar = ".")
		{
			if (string.IsNullOrWhiteSpace(text))
				return string.Empty;
			if (text.Length < length)
				return text;
			return text.Substring(0, length) + GetEndString(endCharCount, endChar);
		}

		/// <summary>
		/// 获取结束字符串
		/// </summary>
		private static string GetEndString(int endCharCount, string endChar)
		{
			StringBuilder result = new StringBuilder();
			for (int i = 0; i < endCharCount; i++)
				result.Append(endChar);
			return result.ToString();
		}

		#endregion Truncate(截断字符串)

		#region ToSimplifiedChinese(转换为简体中文)

		/// <summary>
		/// 转换为简体中文
		/// </summary>
		/// <param name="text">繁体中文</param>
		public static string ToSimplifiedChinese(string text)
		{
			return Strings.StrConv(text, VbStrConv.SimplifiedChinese);
		}

		#endregion ToSimplifiedChinese(转换为简体中文)

		#region ToSimplifiedChinese(转换为繁体中文)

		/// <summary>
		/// 转换为繁体中文
		/// </summary>
		/// <param name="text">简体中文</param>
		public static string ToTraditionalChinese(string text)
		{
			return Strings.StrConv(text, VbStrConv.TraditionalChinese);
		}

		#endregion ToSimplifiedChinese(转换为繁体中文)

		#region Unique(获取全局唯一值)

		/// <summary>
		/// 获取全局唯一值
		/// </summary>
		public static string Unique()
		{
			return Guid.NewGuid().ToString().Replace("-", "");
		}

		#endregion Unique(获取全局唯一值)

		#region GetLastProperty(获取最后一个属性)

		/// <summary>
		/// 获取最后一个属性
		/// </summary>
		/// <param name="propertyName">属性名，范例，A.B.C,返回"C"</param>
		public static string GetLastProperty(string propertyName)
		{
			if (string.IsNullOrEmpty(propertyName))
				return string.Empty;
			var lastIndex = propertyName.LastIndexOf(".", StringComparison.Ordinal) + 1;
			return propertyName.Substring(lastIndex);
		}

		#endregion GetLastProperty(获取最后一个属性)
	}
}