using System;
using System.Data;
using System.Globalization;

namespace Ease.Core.DataAccess
{
    #region DataAccess: Data Handler

    /// <summary>
    /// Handle the null value
    /// </summary>
    public class RowReader
    {
        private DataRow _row;

        public RowReader(DataRow row)
        {
            _row = row;
        }

        #region Get ID

        public long GetID(Type[] types, params int[] fldIdxs)
        {
            if (types == null || fldIdxs == null || types.Length != fldIdxs.Length)
                throw new Exception("Invalid use of array for ID.");

            string value = string.Empty;
            foreach (int fldIdx in fldIdxs)
            {
                if (_row[fldIdx] == null || _row[fldIdx] == DBNull.Value)
                    return long.MinValue;

                value += value.Length > 0 ? "|" : "";
                value += this.GetID(types[fldIdx], _row[fldIdx]);
            }

            return long.Parse(value);
        }

        public long GetID(Type[] types, params string[] names)
        {
            if (types == null || names == null || types.Length != names.Length)
                throw new Exception("Invalid use of array for ID.");

            int fldIdx = -1;
            string value = string.Empty;
            foreach (string name in names)
            {
                fldIdx++;
                if (_row[name] == null || _row[name] == DBNull.Value)
                    return long.MinValue;

                value += value.Length > 0 ? "|" : "";
                value += this.GetID(types[fldIdx], _row[name]);
            }

            return long.Parse(value);
        }

        private string GetID(Type fldType, object fldValue)
        {
            if (fldType == typeof(int) || fldType == typeof(uint))
                return string.Format("i:{0}", fldValue);
            else if (fldType == typeof(long) || fldType == typeof(ulong) || fldType == typeof(decimal))
                return string.Format("l:{0}", fldValue);
            else
                throw new Exception("Invalid use of type for ID");
        }

        #endregion

        #region Get Null value

        public static bool? GetNullValue(bool value, bool nullIfValue)
        {
            return (value == nullIfValue) ? null : (bool?)value;
        }

        public static byte? GetNullValue(byte value, byte nullIfValue)
        {
            return (value == nullIfValue) ? null : (byte?)value;
        }

        public static sbyte? GetNullValue(sbyte value, sbyte nullIfValue)
        {
            return (value == nullIfValue) ? null : (sbyte?)value;
        }

        public static short? GetNullValue(short value, short nullIfValue)
        {
            return (value == nullIfValue) ? null : (short?)value;
        }

        public static ushort? GetNullValue(ushort value, ushort nullIfValue)
        {
            return (value == nullIfValue) ? null : (ushort?)value;
        }

        public static int? GetNullValue(int value, int nullIfValue)
        {
            return (value == nullIfValue) ? null : (int?)value;
        }

        public static uint? GetNullValue(uint value, uint nullIfValue)
        {
            return (value == nullIfValue) ? null : (uint?)value;
        }

        public static ulong? GetNullValue(ulong value, ulong nullIfValue)
        {
            return (value == nullIfValue) ? null : (ulong?)value;
        }

        public static long? GetNullValue(long value, long nullIfValue)
        {
            return (value == nullIfValue) ? null : (long?)value;
        }

        public static decimal? GetNullValue(decimal value, decimal nullIfValue)
        {
            return (value == nullIfValue) ? null : (byte?)value;
        }

        public static double? GetNullValue(double value, double nullIfValue)
        {
            return (value == nullIfValue) ? null : (byte?)value;
        }

        public static float? GetNullValue(float value, float nullIfValue)
        {
            return (value == nullIfValue) ? null : (float?)value;
        }

        public static char? GetNullValue(char value, char nullIfValue)
        {
            return (value == nullIfValue) ? null : (char?)value;
        }

        public static object GetNullValue(string value, string nullIfValue)
        {
            return (value == nullIfValue) ? null : value;
        }

        public static DateTime? GetNullValue(DateTime value, DateTime nullIfValue)
        {
            return (value == nullIfValue) ? null : (DateTime?)value;
        }

        public static Guid? GetNullValue(Guid value, Guid nullIfValue)
        {
            return (value == nullIfValue) ? null : (Guid?)value;
        }

        public static bool? GetNullValue(bool? value)
        {
            return (value == null || value == false) ? null : (bool?)value;
        }

        public static byte? GetNullValue(byte? value)
        {
            return (value == null || value == 0) ? null : (byte?)value;
        }

        public static sbyte? GetNullValue(sbyte? value)
        {
            return (value == null || value == 0) ? null : (sbyte?)value;
        }

        public static short? GetNullValue(short? value)
        {
            return (value == null || value == 0) ? null : (short?)value;
        }

        public static ushort? GetNullValue(ushort? value)
        {
            return (value == null || value == 0) ? null : (ushort?)value;
        }

        public static int? GetNullValue(int? value)
        {
            return (value == null || value == 0) ? null : (int?)value;
        }

        public static uint? GetNullValue(uint? value)
        {
            return (value == null || value == 0) ? null : (uint?)value;
        }

        public static ulong? GetNullValue(ulong? value)
        {
            return (value == null || value == 0) ? null : (ulong?)value;
        }

        public static long? GetNullValue(long? value)
        {
            return (value == null || value == 0) ? null : (long?)value;
        }

        public static decimal? GetNullValue(decimal? value)
        {
            return (value == null || value == 0) ? null : (decimal?)value;
        }

        public static double? GetNullValue(double? value)
        {
            return (value == null || value == 0) ? null : (double?)value;
        }

        public static float? GetNullValue(float? value)
        {
            return (value == null || value == 0) ? null : (float?)value;
        }

        public static char? GetNullValue(char? value)
        {
            return (value == null || (byte)value == 0) ? null : (char?)value;
        }

        public static string GetNullValue(string value)
        {
            return (string.IsNullOrEmpty(value)) ? null : value;
        }

        public static DateTime? GetNullValue(DateTime? value)
        {
            return (value == null || value == DateTime.MinValue) ? null : (DateTime?)value;
        }

        public static Guid? GetNullValue(Guid? value)
        {
            return value;
        }

        public static Object GetNullValue(long value)
        {
            if (value == null || value == long.MinValue)
                return null;


            return value;
        }

        #endregion

        #region Default Null Values

        public bool? GetBoolean(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            if (value == null || value == DBNull.Value)
                return null;

            if (value.ToString().Trim().Equals("1") || value.ToString().Trim().Equals("-1") ||
                value.ToString().Trim().ToLower().Equals("true") || value.ToString().Trim().ToLower().Equals("yes"))
                return true;
            else if (value.ToString().Trim().Equals("0") || value.ToString().Trim().ToLower().Equals("false") ||
                     value.ToString().Trim().ToLower().Equals("no"))
                return false;
            else
                return (bool?)value.ToBoolean(null);
        }

        public byte? GetByte(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (byte?)value.ToByte(null);
        }

        public sbyte? GetSByte(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (sbyte?)value.ToSByte(null);
        }

        public short? GetInt16(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (short?)value.ToInt16(null);
        }

        public ushort? GetUInt16(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (ushort?)value.ToUInt16(null);
        }

        public int? GetInt32(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (int?)value.ToInt32(null);
        }

        public uint? GetUInt32(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (uint?)value.ToUInt32(null);
        }

        public long? GetInt64(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (long?)value.ToInt64(null);
        }

        public ulong? GetUInt64(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (ulong?)value.ToUInt64(null);
        }

        public decimal? GetDecimal(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (decimal?)value.ToDecimal(null);
        }

        public double? GetDouble(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (double?)value.ToDouble(null);
        }

        public float? GetFloat(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (float?)value.ToSingle(null);
        }

        public char? GetChar(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (char?)value.ToChar(null);
        }

        public string GetString(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : value.ToString(null);
        }

        public DateTime? GetDateTime(int i)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? null : (DateTime?)value.ToDateTime(null);
        }

        public Guid? GetGuid(int i)
        {
            object value = _row[i];
            return value == DBNull.Value ? null : (Guid?)value;
        }

        public byte[] GetLob(int i)
        {
            return (byte[])(_row.IsNull(i) ? (byte[])null : _row[i]);
        }

        public bool? GetBoolean(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            if (value == null || value == DBNull.Value)
                return null;

            if (value.ToString().Trim().Equals("1") || value.ToString().Trim().Equals("-1") ||
                value.ToString().Trim().ToLower().Equals("true") || value.ToString().Trim().ToLower().Equals("yes"))
                return true;
            else if (value.ToString().Trim().Equals("0") || value.ToString().Trim().ToLower().Equals("false") ||
                     value.ToString().Trim().ToLower().Equals("no"))
                return false;
            else
                return (bool?)value.ToBoolean(null);
        }

        public byte? GetByte(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (byte?)value.ToByte(null);
        }

        public sbyte? GetSByte(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (sbyte?)value.ToSByte(null);
        }

        public short? GetInt16(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (short?)value.ToInt16(null);
        }

        public ushort? GetUInt16(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (ushort?)value.ToUInt16(null);
        }

        public int? GetInt32(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? (int?)null : (int?)value.ToInt32(null);
        }

        public uint? GetUInt32(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (uint?)value.ToUInt32(null);
        }

        public long? GetInt64(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (long?)value.ToInt64(null);
        }

        public ulong? GetUInt64(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (ulong?)value.ToUInt64(null);
        }

        public decimal? GetDecimal(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (decimal?)value.ToDecimal(null);
        }

        public double? GetDouble(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (double?)value.ToDouble(null);
        }

        public float? GetFloat(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (float?)value.ToSingle(null);
        }

        public char? GetChar(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (char?)value.ToChar(null);
        }

        public string GetString(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : value.ToString(null);
        }

        public DateTime? GetDateTime(string name)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? null : (DateTime?)value.ToDateTime(null);
        }

        public Guid? GetGuid(string name)
        {
            object value = _row[name];
            return value == DBNull.Value ? null : (Guid?)value;
        }

        public byte[] GetLob(string name)
        {
            return (byte[])(_row[name] == DBNull.Value ? (byte[])null : _row[name]);
        }

        #endregion

        #region Parameterized Null Value

        public bool GetBoolean(int i, bool valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            if (value == null || value == DBNull.Value)
                return valueIfNull;

            if (value.ToString().Trim().Equals("1") || value.ToString().Trim().Equals("-1") ||
                value.ToString().Trim().ToLower().Equals("true") || value.ToString().Trim().ToLower().Equals("yes"))
                return true;
            else if (value.ToString().Trim().Equals("0") || value.ToString().Trim().ToLower().Equals("false") ||
                     value.ToString().Trim().ToLower().Equals("no"))
                return false;
            else
                return value.ToBoolean(null);
        }

        public byte GetByte(int i, byte valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToByte(null);
        }

        public sbyte GetSByte(int i, sbyte valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToSByte(null);
        }

        public short GetInt16(int i, short valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToInt16(null);
        }

        public ushort GetUInt16(int i, ushort valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToUInt16(null);
        }

        public int GetInt32(int i, int valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToInt32(null);
        }

        public uint GetUInt32(int i, uint valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToUInt32(null);
        }

        public ulong GetUInt64(int i, ulong valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToUInt64(null);
        }

        public long GetInt64(int i, long valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToInt64(null);
        }

        public decimal GetDecimal(int i, decimal valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToDecimal(null);
        }

        public double GetDouble(int i, double valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToDouble(null);
        }

        public float GetFloat(int i, float valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToSingle(null);
        }

        public char GetChar(int i, char valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToChar(null);
        }

        public string GetString(int i, string valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToString(null);
        }

        public DateTime GetDateTime(int i, DateTime valueIfNull)
        {
            IConvertible value = (IConvertible)_row[i];
            return value == DBNull.Value ? valueIfNull : value.ToDateTime(null);
        }

        public Guid GetGuid(int i, Guid valueIfNull)
        {
            object value = _row[i];
            return value == DBNull.Value ? valueIfNull : (Guid)value;
        }

        public bool GetBoolean(string name, bool valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            if (value == null || value == DBNull.Value)
                return valueIfNull;

            if (value.ToString().Trim().Equals("1") || value.ToString().Trim().Equals("-1") ||
                value.ToString().Trim().ToLower().Equals("true") || value.ToString().Trim().ToLower().Equals("yes"))
                return true;
            else if (value.ToString().Trim().Equals("0") || value.ToString().Trim().ToLower().Equals("false") ||
                     value.ToString().Trim().ToLower().Equals("no"))
                return false;
            else
                return value.ToBoolean(null);
        }

        public byte GetByte(string name, byte valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToByte(null);
        }

        public sbyte GetSByte(string name, sbyte valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToSByte(null);
        }

        public short GetInt16(string name, short valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToInt16(null);
        }

        public ushort GetUInt16(string name, ushort valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToUInt16(null);
        }

        public int GetInt32(string name, int valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToInt32(null);
        }

        public uint GetUInt32(string name, uint valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToUInt32(null);
        }

        public ulong GetUInt64(string name, ulong valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToUInt64(null);
        }

        public long GetInt64(string name, long valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToInt64(null);
        }

        public decimal GetDecimal(string name, decimal valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToDecimal(null);
        }

        public double GetDouble(string name, double valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToDouble(null);
        }

        public float GetFloat(string name, float valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToSingle(null);
        }

        public char GetChar(string name, char valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToChar(null);
        }

        public string GetString(string name, string valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToString(null);
        }

        public DateTime GetDateTime(string name, DateTime valueIfNull)
        {
            IConvertible value = (IConvertible)_row[name];
            return value == DBNull.Value ? valueIfNull : value.ToDateTime(null);
        }

        public Guid GetGuid(string name, Guid valueIfNull)
        {
            object value = _row[name];
            return value == DBNull.Value ? valueIfNull : (Guid)value;
        }

        #endregion
    }

    #endregion
}