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

namespace FCS.Common
{
    /// <summary>
    /// 字符串操作 - 工具方法
    /// </summary>
    public static partial class StringHelper
    {
        #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 删除最后一个字符之后的字符

        /// <summary>
        /// 删除最后结尾的一个逗号
        /// </summary>
        public static string DelLastComma(string str)
        {
            return str.Substring(0, str.LastIndexOf(",", StringComparison.Ordinal));
        }

        /// <summary>
        /// 删除最后结尾的指定字符后的字符
        /// </summary>
        public static string DelLastChar(string str, string strchar)
        {
            return str.Substring(0, str.LastIndexOf(strchar, StringComparison.Ordinal));
        }

        /// <summary>
        /// 删除最后结尾的长度
        /// </summary>
        /// <param name="str"></param>
        /// <param name="Length"></param>
        /// <returns></returns>
        public static string DelLastLength(string str, int Length)
        {
            if (string.IsNullOrEmpty(str))
                return "";
            str = str.Substring(0, str.Length - Length);
            return str;
        }

        #endregion 删除最后一个字符之后的字符

        #region 快速验证一个字符串是否符合指定的正则表达式

        /// <summary>
        /// 快速验证一个字符串是否符合指定的正则表达式。
        /// </summary>
        /// <param name="express">正则表达式的内容。</param>
        /// <param name="value">需验证的字符串。</param>
        /// <returns>是否合法的bool值。</returns>
        public static bool QuickValidate(string express, string value)
        {
            if (value == null) return false;
            Regex myRegex = new Regex(express);
            if (value.Length == 0)
            {
                return false;
            }
            return myRegex.IsMatch(value);
        }

        #endregion 快速验证一个字符串是否符合指定的正则表达式

        /// <summary>
        /// 检测空值,为null则抛出ArgumentNullException异常
        /// </summary>
        /// <param name="obj">对象</param>
        /// <param name="parameterName">参数名</param>
        public static void CheckNull(this object obj, string parameterName)
        {
            if (obj == null)
                throw new ArgumentNullException(parameterName);
        }

        /// <summary>
        /// 是否为空
        /// </summary>
        /// <param name="value">值</param>
        public static bool IsEmpty(this string value)
        {
            return string.IsNullOrWhiteSpace(value);
        }

        /// <summary>
        /// 是否为空
        /// </summary>
        /// <param name="value">值</param>
        public static bool IsEmpty(this Guid? value)
        {
            if (value == null)
                return true;
            return IsEmpty(value.Value);
        }

        /// <summary>
        /// 是否为空
        /// </summary>
        /// <param name="value">值</param>
        public static bool IsEmpty(this Guid value)
        {
            if (value == Guid.Empty)
                return true;
            return false;
        }

        /// <summary>
        /// 是否为空
        /// </summary>
        /// <param name="value">值</param>
        public static bool IsEmpty(this object value)
        {
            if (value != null && !string.IsNullOrEmpty(value.ToStringEx() != "null" ? value.ToStringEx() : ""))
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 直接格式化字符串
        /// </summary>
        public static string FormatMe(this String source, params object[] args)
        {
            return string.Format(source, args);
        }


        #region 数据类型转换扩展方法

        /// <summary>
        /// object 转换成string 包括为空的情况
        /// </summary>
        /// <param name="obj"></param>
        /// <returns>返回值不含空格</returns>
        public static string ToStringEx(this object obj)
        {
            return obj == null ? string.Empty : obj.ToString().Trim();
        }

        /// <summary>
        /// 时间object 转换成格式化的string 包括为空的情况
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="format"></param>
        /// <returns>返回值不含空格</returns>
        public static string TryToDateTimeToString(this object obj, string format)
        {
            if (obj == null)
                return string.Empty;
            DateTime dt;
            if (DateTime.TryParse(obj.ToString(), out dt))
                return dt.ToString(format);
            else
                return string.Empty;
        }

        /// <summary>
        /// 字符转Int
        /// </summary>
        /// <param name="obj"></param>
        /// <returns>成功:返回对应Int值;失败:返回0</returns>
        public static int TryToInt32(this object obj)
        {
            int rel = 0;

            if (!string.IsNullOrEmpty(obj.ToStringEx()))
            {
                int.TryParse(obj.ToStringEx(), out rel);
            }
            return rel;
        }

        /// <summary>
        /// 字符转Int64
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static Int64 TryToInt64(this object obj)
        {
            Int64 rel = 0;
            if (!string.IsNullOrEmpty(obj.ToStringEx()))
            {
                Int64.TryParse(obj.ToStringEx(), out rel);
            }
            return rel;
        }

        /// <summary>
        /// 字符转DateTime
        /// </summary>
        /// <param name="obj"></param>
        /// <returns>成功:返回对应Int值;失败:时间初始值</returns>
        public static DateTime TryToDateTime(this object obj)
        {
            DateTime rel = new DateTime();
            if (!string.IsNullOrEmpty(obj.ToStringEx()))
            {
                DateTime.TryParse(obj.ToStringEx(), out rel);
            }
            return rel;
        }

        /// <summary>
        /// 转换成bool类型
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static Boolean TryToBoolean(this object obj)
        {
            Boolean rel = false;
            if (!string.IsNullOrEmpty(obj.ToStringEx()))
            {
                string s = obj.ToStringEx();

                if (s.Equals("true") || s.Equals("1") || s.Equals("是"))
                {
                    rel = true;
                }
                else
                {
                    Boolean.TryParse(obj.ToStringEx(), out rel);
                }
            }
            return rel;
        }

        /// <summary>
        /// 转换特殊字符的字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToJoin(this IEnumerable<string> obj, string separator = ",")
        {
            var list = obj.ToList();
            if (list == null || list.Count <= 0)
                return string.Empty;
            return string.Join(separator, obj);
        }

        #endregion 数据类型转换扩展方法
    }
}