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

namespace POSV.Utils
{
    public class DecimalUtils
    {
        /// <summary>
        /// decimal保留指定位数小数
        /// </summary>
        /// <param name="num">原始数量</param>
        /// <param name="scale">保留小数位数</param>
        /// <returns>截取指定小数位数后的数量字符串</returns>
        public static decimal ToRound(decimal num , int scale)
        {
            string strDecimal = Math.Round(num , scale , MidpointRounding.AwayFromZero).ToString();

            int index = strDecimal.IndexOf(".");
            if (index == -1 || strDecimal.Length < index + scale + 1)
            {
                strDecimal = string.Format("{0:F" + scale + "}" , num);
            }
            else
            {
                int length = index;
                if (scale != 0)
                {
                    length = index + scale + 1;
                }
                strDecimal = strDecimal.Substring(0 , length);
            }

            decimal result;
            decimal.TryParse(strDecimal , out result);

            return result;
        }

        public static decimal Fen2Yuan(object amount)
        {
            return Fen2Yuan(StringUtils.GetDecimal(amount));
        }

        public static decimal Fen2Yuan(decimal amount)
        {
            return amount / 100;
        }

        /// <summary>
        /// 元转分
        /// </summary>
        /// <param name="amount"></param>
        /// <returns></returns>
        public static string Yuan2Fen(decimal amount)
        {
            return Convert.ToInt64(amount * 100).ToString();
        }

    }
}