using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Pcb.Common.Extension
{
    public static class NumberExtension
    {
        private const string QFW_FORMAT_TWO_DIGITAL = "N2";
        private const string QFW_FORMAT_ZERO_DIGITIAL = "N0";
        //private const decimal THRESHOLD_VALUE = 1000;


        //public static string ToQswString(this decimal? value)
        //{
        //    if (value == null)
        //    {
        //        return string.Empty;
        //    }

        //    return value.Value < THRESHOLD_VALUE ? value.Value.ToString("F2") : value.Value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQswString(this int? value)
        //{
        //    if (value == null)
        //    {
        //        return string.Empty;
        //    }

        //    return value.Value < THRESHOLD_VALUE ? value.Value.ToString() : value.Value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQswString(this decimal value)
        //{
        //    return value < THRESHOLD_VALUE ? value.ToString("F2") : value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQswString(this int value)
        //{
        //    return value < THRESHOLD_VALUE ? value.ToString() : value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQfwStringWithOptionDigital(this decimal? value)
        //{
        //    if (value == null)
        //    {
        //        return string.Empty;
        //    }

        //    return value.Value == 0 ? ZERO : value.Value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQfwStringWithOptionDigital(this int? value)
        //{
        //    if (value == null)
        //    {
        //        return string.Empty;
        //    }

        //    return value.Value == 0 ? ZERO : value.Value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQfwStringWithOptionDigital(this decimal value)
        //{
        //    return value == 0 ? ZERO : value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        //public static string ToQfwStringWithOptionDigital(this int value)
        //{
        //    return value == 0 ? ZERO : value.ToString(QFW_FORMAT_TWO_DIGITAL);
        //}

        /// <summary>
        /// 获取千分位数据。如果传入数据为空，那么不显示。如果传入的数据有小数点，那么显示带2位小数的数据。如果传入的数据没有小数点，那么显示整形的数据。
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ToQfwOrEmptyString(this decimal? value)
        {
            if (value == null)
            {
                return string.Empty;
            }

            return value.Value == (Int64)value.Value ? value.Value.ToString(QFW_FORMAT_ZERO_DIGITIAL) : value.Value.ToString(QFW_FORMAT_TWO_DIGITAL);
        }

        /// <summary>
        /// 获取千分位数据。如果传入数据为空，那么显示0。如果传入的数据有小数点，那么显示带2位小数的数据。如果传入的数据没有小数点，那么显示整形的数据。
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ToQfwOrZeroString(this decimal? value)
        {
            if (value == null)
            {
                value = 0;
            }

            return ToQfwOrEmptyString(value);
        }


        /// <summary>
        /// 获取千分位数据。
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ToQfwString(this int value)
        {
            return value.ToString(QFW_FORMAT_ZERO_DIGITIAL);
        }


        /// <summary>
        /// 获取千分位数据。
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ToQfwString(this decimal value)
        {
            return value == (Int64)value ? value.ToString(QFW_FORMAT_ZERO_DIGITIAL) : value.ToString(QFW_FORMAT_TWO_DIGITAL);
        }

        /// <summary>
        /// 10进制转换指定进制
        /// </summary>
        /// <param name="Num">十进制整数</param>
        /// <param name="HexList">进制字符串</param>
        /// <returns></returns>
        public static string _ToHex(this int Num, string HexList = "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
        {
            var ostr = new List<char>();
            int c = HexList.Length;
            while (Num >= c)
            {
                var m = Num % c;
                var x = (Num - m) / c;
                ostr.Add(HexList[m]);
                Num = x;
            }
            ostr.Add(HexList[Num]);
            ostr.Reverse();
            return string.Join("", ostr);
        }
        /// <summary>
        /// 10进制转换16进制
        /// </summary>
        /// <param name="Num">十进制整数</param>
        /// <param name="HexList">进制字符串</param>
        /// <returns></returns>
        public static string _ToHex16(this int Num, string HexList = "0123456789ABCDEF")
        {
            return Num._ToHex(HexList);
        }
        /// <summary>
        /// 10进制转换Excel表列进制
        /// </summary>
        /// <param name="Num">十进制整数</param>
        /// <param name="HexList">进制字符串</param>
        /// <returns></returns>
        public static string _ToHexExcelColumn(this int Num, string HexList = "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
        {
            string ostr = string.Empty;
            if (Num < 26)
            {
                ostr = Num._ToHex(HexList);
                return ostr;
            }
            Num = Num - 26;
            if (Num < 676)
            {
                ostr = Num._ToHex(HexList);
                return "A"._CopyAndJoin(2 - ostr.Length) + ostr;
            }
            Num = Num - 676;
            if (Num < 17576)
            {
                ostr = Num._ToHex(HexList);
                return "A"._CopyAndJoin(3 - ostr.Length) + ostr;
            }
            Num = Num - 17576;
            if (Num < 456976)
            {
                ostr = Num._ToHex(HexList);
                return "A"._CopyAndJoin(4 - ostr.Length) + ostr;
            }
            return Num._ToHex(HexList);
        }
    }
}