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

namespace APT.Infrastructure.Core
{
	public static class LibUtils
	{

		/// <summary>
		/// 转为字符串
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static string ToString(object obj)
		{
			if (obj == null||obj==DBNull.Value) return string.Empty;
			return obj.ToString();
		}


		/// <summary>
		/// 转为整数
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static int ToInt(object obj)
		{
			if (obj == null || obj == DBNull.Value) return 0;
			try
			{
				return Convert.ToInt32(obj.ToString());
			}
			catch
			{
			}
			return 0;
		}

		/// <summary>
		/// 转为Decimal
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static decimal ToDecimal(object obj)
		{
			if (obj == null || obj == DBNull.Value) return 0;
			try
			{
				return Convert.ToDecimal(obj.ToString());
			}
			catch
			{
			}
			return 0;
		}


		/// <summary>
		/// 转为日期
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static DateTime? ToDateTime(object obj)
		{
			if (obj == null || obj == DBNull.Value) return null;
			try
			{
				return Convert.ToDateTime(obj.ToString());
			}
			catch
			{
			}
			return null;
		}


		/// <summary>
		/// 转为Guid
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static Guid? ToGuid(object obj)
		{
			if (obj == null || obj == DBNull.Value) return null;
			try
			{
				return new Guid(obj.ToString());
			}
			catch
			{
			}
			return null;
		}


		/// <summary>
		/// 转为布尔类型
		/// </summary>
		/// <param name="obj"></param>
		/// <returns></returns>
		public static bool ToBoolean(object obj)
		{
			if (obj == null || obj == DBNull.Value) return false;
			try
			{
				return Convert.ToBoolean(obj);
			}
			catch
			{
				string str = LibUtils.ToString(obj);
				if (string.Compare(str, "是", true) == 0)
					return true;
			}
			return false;
		}


		/// <summary>
		///  比较两个指定的 System.String 对象（其中忽略或考虑其大小写），并返回一个整数
		/// </summary>
		/// <param name="objA"></param>
		/// <param name="objB"></param>
		/// <param name="ignoreCase">是否忽略大小写</param>
		/// <returns></returns>
		public static int Compare(object objA, object objB, bool ignoreCase = true)
		{
			if (objA == null || objB == null) return 0;
			return string.Compare(ToString(objA), ToString(objB), ignoreCase);
		}


        /// <summary>
        /// 保留指定小数点位数
        /// </summary>
        /// <param name="qty"></param>
        /// <param name="len"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        public static decimal Round(decimal qty,int len, LibRoundTypeEnum type)
        {
            if (type == LibRoundTypeEnum.向上进位)
            {
                if (len != 0)
                {
                    var s = qty.ToString().Split('.');
                    if (s.Length >= 2)
                    {
                        var x = s[1].PadRight(6, '0');
                        qty = Convert.ToDecimal(s[0] + "." + x.Substring(0, len)); 
                    }
                }
                else
                    qty = Math.Ceiling(qty);
                return qty;
            }
            else if (type == LibRoundTypeEnum.向下舍弃)
            {
                if (len != 0)
                {
                    var s = qty.ToString().Split('.');
                    if (s.Length >= 2)
                    {
                        var x = s[1].PadRight(6, '0');
                        qty = Convert.ToDecimal(s[0] + "." + x.Substring(0, len));
                        if (x[len] != '0')
                            qty += 1 / (decimal)Math.Pow(10, len);
                    }
                }
                else
                {
                    qty = Math.Floor(qty);
                }
                return qty;
            }
            return Math.Round(qty, len, MidpointRounding.AwayFromZero);
        }


    }
}