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

namespace Shentun.Utilities
{
    public class ArgumentValidation
    {
        #region 判断对象是否为空
        /// <summary>
        /// 判断对象是否为空，为空返回true
        /// </summary>
        /// <typeparam name="T">要验证的对象的类型</typeparam>
        /// <param name="data">要验证的对象</param>        
        public static bool IsNull<T>(T data)
        {
            //如果为null
            if (data == null)
            {
                return true;
            }

            //如果为""
            if (data.GetType() == typeof(String))
            {
                if (string.IsNullOrWhiteSpace(data.ToString().Trim()))
                {
                    return true;
                }
            }

            //如果为DBNull
            if (data.GetType() == typeof(DBNull))
            {
                return true;
            }

            //不为空
            return false;
        }

        /// <summary>
        /// 判断对象是否为空，为空返回true
        /// </summary>
        /// <param name="data">要验证的对象</param>
        public static bool IsNull(object data)
        {
            //如果为null
            if (data == null)
            {
                return true;
            }

            //如果为""
            if (data.GetType() == typeof(String))
            {
                if (string.IsNullOrWhiteSpace(data.ToString().Trim()))
                {
                    return true;
                }
            }

            //如果为DBNull
            if (data.GetType() == typeof(DBNull))
            {
                return true;
            }

            //不为空
            return false;
        }
        public static void CheckNull<T>(T data, string variableName)
        {
            if (IsNull<T>(data))
            {
                throw new Exception(variableName + "不能为空");
            }
            if(data is DateTime)
            {
                DateTime? dateTime  ;
                dateTime = data as DateTime?;
                if (dateTime <= new DateTime(1900,1,1))
                {
                    throw new Exception(variableName + "不能为空");
                }
            }
        }

        public static bool IsNumber(string value)
        {
            try
            {
                decimal data = 0.0m;
                if(value.ToUpper().Contains("E"))
                {
                    data = Convert.ToDecimal(Decimal.Parse(value.ToString(), System.Globalization.NumberStyles.Float));
                }
                else
                {
                    data = Convert.ToDecimal(value);
                }
                return true;
            }
            catch(Exception ex)
            {
                return false;
            }
            //return Regex.IsMatch(value, "[\\+-]?[0-9]*(\\.[0-9])?([eE][\\+-]?[0-9]+)?");

        }

        public static void CheckIdNo(string idNo)
        {
            if(string.IsNullOrWhiteSpace(idNo))
            {
                throw new Exception("身份证号不能是空值");
            }
            if (idNo.Length != 18)
                throw new Exception("身份证号长度必须为18位");

            var birthDate = Convert.ToDateTime(idNo.Substring(6, 4) + "-" +
               idNo.Substring(10, 2) + "-" +
                            idNo.Substring(12, 2));
            if (birthDate < new DateTime(1880, 1, 1) || birthDate > DateTime.Now.Date)
            {
                throw new Exception("身份证号中的出生日期不正确");
            }
        }
        #endregion
    }
}