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

namespace ICSSoft.FromERP
{
    public static class ConvertExt
    {
        public static char ToChar(this object data)
        {
            char returnValue = default(char);
            if (data == null)
                return returnValue;
            else
            {
                if (char.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return returnValue;
            }
        }

        #region 文本转换
        public static string ToStringExt(this object data)
        {
            return data == null ? string.Empty : data.ToString();
        }

        #endregion

        #region 日期转换
        /// <summary>
        /// 转换为日期
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>DateTime.</returns>
        public static DateTime ToDate(this object data)
        {
            try
            {
                if (data == null)
                    return DateTime.MinValue;
                if (System.Text.RegularExpressions.Regex.IsMatch(data.ToStringExt(), @"^\d{8}$"))
                {
                    string strValue = data.ToStringExt();
                    return new DateTime(strValue.Substring(0, 4).ToInt(), strValue.Substring(4, 2).ToInt(), strValue.Substring(6, 2).ToInt());
                }
                DateTime result;
                return DateTime.TryParse(data.ToString(), out result) ? result : DateTime.MinValue;
            }
            catch
            {
                return DateTime.MinValue;
            }
        }

        /// <summary>
        /// 转换为可空日期
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>System.Nullable&lt;DateTime&gt;.</returns>
        public static DateTime? ToDateOrNull(this object data)
        {
            try
            {
                if (data == null)
                    return null;
                if (System.Text.RegularExpressions.Regex.IsMatch(data.ToStringExt(), @"^\d{8}$"))
                {
                    string strValue = data.ToStringExt();
                    return new DateTime(strValue.Substring(0, 4).ToInt(), strValue.Substring(4, 2).ToInt(), strValue.Substring(6, 2).ToInt());
                }
                DateTime result;
                bool isValid = DateTime.TryParse(data.ToString(), out result);
                if (isValid)
                    return result;
                return null;
            }
            catch
            {
                return null;
            }
        }
        /// <summary>
        /// 转换为日期
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>DateTime.</returns>
        public static DateTime ToDateTime(this object data)
        {
            try
            {
                if (data == null)
                    return DateTime.MinValue;
                if (System.Text.RegularExpressions.Regex.IsMatch(data.ToStringExt(), @"^\d{14}$"))
                {
                    string strValue = data.ToStringExt();
                    return new DateTime(strValue.Substring(0, 4).ToInt(), strValue.Substring(4, 2).ToInt(), strValue.Substring(6, 2).ToInt(),
                        strValue.Substring(8, 2).ToInt(), strValue.Substring(10, 2).ToInt(), strValue.Substring(12, 2).ToInt());
                }
                DateTime result;
                return DateTime.TryParse(data.ToString(), out result) ? result : DateTime.MinValue;
            }
            catch
            {
                return DateTime.MinValue;
            }
        }

        /// <summary>
        /// 转换为可空日期
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>System.Nullable&lt;DateTime&gt;.</returns>
        public static DateTime? ToDateTimeOrNull(this object data)
        {
            try
            {
                if (data == null)
                    return null;
                if (System.Text.RegularExpressions.Regex.IsMatch(data.ToStringExt(), @"^\d{14}$"))
                {
                    string strValue = data.ToStringExt();
                    return new DateTime(strValue.Substring(0, 4).ToInt(), strValue.Substring(4, 2).ToInt(), strValue.Substring(6, 2).ToInt(),
                        strValue.Substring(8, 2).ToInt(), strValue.Substring(10, 2).ToInt(), strValue.Substring(12, 2).ToInt());
                }
                DateTime result;
                bool isValid = DateTime.TryParse(data.ToString(), out result);
                if (isValid)
                    return result;
                return null;
            }
            catch
            {
                return null;
            }
        }

        #endregion

        

        public static bool ToBool(this object data)
        {
            Boolean returnValue = false;
            if (data == null)
                return returnValue;
            else
            {
                if (Boolean.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return returnValue;
            }
        }

        public static Nullable<bool> ToBoolWithNull(this object data)
        {
            Boolean returnValue = false;
            if (data == null)
                return null;
            else
            {
                if (Boolean.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        #region 数字转换

        public static decimal ToDecimal(this object data)
        {
            decimal returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {

                if (decimal.TryParse(data.ToString(), out returnValue))
                {
                    return returnValue;
                }
                else
                {
                    return 0;
                }
            }
        }

        public static Nullable<decimal> ToDecimalWithNull(this object data)
        {
            decimal returnValue = 0;
            if (data == null)
                return null;
            else
            {
                if (decimal.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        public static float ToFloat(this object data)
        {
            float returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {

                if (float.TryParse(data.ToString(), out returnValue))
                {
                    return returnValue;
                }
                else
                {
                    return returnValue;
                }
            }
        }

        public static Nullable<float> ToFloatWithNull(this object data)
        {
            float returnValue = 0;
            if (data == null)
                return null;
            else
            {
                if (float.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        public static double ToDouble(this object data)
        {
            double returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {

                if (double.TryParse(data.ToString(), out returnValue))
                {
                    return returnValue;
                }
                else
                {
                    return 0;
                }
            }
        }

        public static Nullable<double> ToDoubleWithNull(this object data)
        {
            double returnValue = 0;
            if (data == null)
                return null;
            else
            {
                if (double.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        public static Int64 ToInt64(this object data)
        {
            Int64 returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {

                if (Int64.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return 0;
            }
        }

        public static Nullable<Int64> ToInt64WithNull(this object data)
        {
            Int64 returnValue = 0;
            if (data == null)
                return null;
            else
            {
                if (Int64.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        public static Int32 ToInt(this object data)
        {
            Int32 returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {
                if (Int32.TryParse(data.ToString(), out returnValue))
                {
                    return returnValue;
                }
                else
                {
                    return 0;
                }
            }
        }

        public static Nullable<Int32> ToIntWithNull(this object data)
        {
            if (data == null)
                return null;
            int result;
            bool isValid = int.TryParse(data.ToString(), out result);
            if (isValid)
                return result;
            return null;
        }

        public static Int16 ToInt16(this object data)
        {
            Int16 returnValue = 0;
            if (data == null)
                return returnValue;
            else
            {

                if (Int16.TryParse(data.ToString(), out returnValue))
                {
                    return returnValue;
                }
                else
                {
                    return 0;
                }
            }
        }

        public static Nullable<Int16> ToInt16WithNull(this object data)
        {
            Int16 returnValue = 0;
            if (data == null)
                return null;
            else
            {
                if (Int16.TryParse(data.ToString(), out returnValue))
                    return returnValue;
                else
                    return null;
            }
        }

        public static bool IsNumeric(this object o)
        {
            if (o == null || o.ToString() == "")
                return false;

            string strNum = o.ToString();
            System.Text.RegularExpressions.Regex reg1
            = new System.Text.RegularExpressions.Regex(@"^-?[0-9]*$");
            return reg1.IsMatch(strNum);
        }
        #endregion
    }
}