using System;
using System.Collections.Generic;
using System.Text;
using TencentCloud.Ame.V20190916.Models;

namespace Shentun.Utilities
{
    public static class ConvertExtr
    {
        public static int ToAge(DateTime birthdate)
        {
            if(birthdate == null)
            {
                throw new ArgumentNullException("转换到年龄时出生日期不能为空");
            }
            DateTime now = DateTime.Now;
            int age = now.Year - birthdate.Year;
            if (now.Month < birthdate.Month || (now.Month == birthdate.Month && now.Day < birthdate.Day))
            {
                age--;
            }
            return age < 0 ? 0 : age;
        }

        public static DateTime ToBirthDateByIdNo(string idNo)
        {
            if (string.IsNullOrWhiteSpace(idNo))
                throw new Exception("身份证号不能为空");

            if (idNo.Length != 18)
                throw new Exception("身份证长度必须为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))
            {
                throw new Exception("身份证号中的出生日期不正确");
            }

            return birthDate;
        }

        public static DateTime ToBirthDateByAge(short age)
        {
            if (age <= 0)
                throw new Exception("转换成出生日期时年龄不能小于等于0");

         
            var birthDate = DateTime.Now.AddYears(-age);

            if (birthDate < new DateTime(1880, 1, 1))
            {
                throw new Exception("年龄转换出的出生日期不正确");
            }

            return birthDate;
        }

        public static string ToSexByIdNo(string idNo)
        {
            if (string.IsNullOrWhiteSpace(idNo))
                throw new Exception("身份证号不能为空");

            if (idNo.Length != 18)
                throw new Exception("身份证长度必须为18位");

            string sex = idNo.Substring(14, 3);

            if (int.Parse(sex) % 2 == 0)
            {

                sex = Sex.Female;
            }
            else if (int.Parse(sex) % 2 != 0)
            {

                sex = Sex.Male;
            }
            return sex;
        }

        public static string ToBirthPlaceByIdNo(string idNo)
        {
            if (string.IsNullOrWhiteSpace(idNo))
                throw new Exception("身份证号不能为空");

            if (idNo.Length != 18)
                throw new Exception("身份证长度必须为18位");
            var birthPlace = idNo.Substring(0, 6);
            return birthPlace;
        }

        public static string ToStringByDateOnly(DateOnly? dateOnly)
        {
            if (dateOnly == null)
            {
                return "0000-00-00";
            }
            return ((DateOnly)dateOnly).ToString("yyyy-MM-dd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
        }
        

        public static string StringToASCII(string value)
        {
            System.Text.Encoding gbk_encoder = System.Text.Encoding.GetEncoding("gb2312");
            byte[] bytes = gbk_encoder.GetBytes(value);
            string textAscii = string.Empty;
            for (int i = 0; i < bytes.Length; i++)
            {
                textAscii += bytes[i].ToString() + ",";
            }
            return textAscii.TrimEnd(',');
        }

        public static string ToChString(string str)
        {
            System.Text.Encoding gbk_encoder = System.Text.Encoding.GetEncoding("gb2312");
            byte[] bs = gbk_encoder.GetBytes(str);
            char[] cs = new char[bs.Length];
            for (int i = 0; i < bs.Length; i++)
                cs[i] = Convert.ToChar(bs[i]);
            //return Encoding.GetEncoding("gb2312").GetString(bs, 0, bs.Length);
            //return Convert.ToString(bs);
            return new String(cs);
        }

        public static string ToGB2312(int codepage, string str)
        {
            try
            {
                Encoding cp850 = Encoding.GetEncoding(codepage);
                Encoding gb2312 = Encoding.GetEncoding("gb2312");//Encoding.Default ,936
                byte[] temp = cp850.GetBytes(str);
                return Encoding.GetEncoding("gb2312").GetString(temp, 0, temp.Length);
            }
            catch (Exception ex)//(UnsupportedEncodingException ex)
            {
                Console.Write(ex.Message);
                return null;
            }
        }

        public static string ToGB2312(string str)
        {
            byte[] bs = Encoding.Default.GetBytes(str);
            bs = Encoding.Convert(Encoding.Default, Encoding.GetEncoding("gb2312"), bs);
            return Encoding.GetEncoding("gb2312").GetString(bs);

            //Encoding cp850 = Encoding.Default;
            //Encoding gb2312 = Encoding.GetEncoding("gb2312");//Encoding.Default ,936
            //byte[] temp = cp850.GetBytes(str);
            //return Encoding.GetEncoding("gb2312").GetString(temp, 0, temp.Length);

        }

        public static string GetHexFromChs(string s)
        {
            if ((s.Length % 2) != 0)
            {
                s += " ";//空格
                         //throw new ArgumentException("s is not valid chinese string!");
            }

            System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");

            byte[] bytes = chs.GetBytes(s);

            string str = "";

            for (int i = 0; i < bytes.Length; i++)
            {
                str += string.Format("{0:X}", bytes[i]);
            }

            return str;
        }


    }
}