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

namespace Ease.Core.DataAccess
{
    #region Null Handler

    public class NullHandler
    {
        private IDataReader _reader;

        public NullHandler()
        {
        }

        public static object GetNullValue(int Value)
        {
            if (Value <= 0)
            {
                return null;
            }
            else
            {
                return Value;
            }
        }

        public static object GetNullValue(DateTime Value)
        {
            if (DateTime.MinValue == Value)
            {
                return null;
            }
            else
            {
                return Value;
            }
        }

        public static object GetNullValue(string Value)
        {
            if (Value.Length <= 0)
            {
                return null;
            }
            else
            {
                return Value;
            }
        }

        public NullHandler(IDataReader reader)
        {
            _reader = reader;
        }

        public IDataReader Reader
        {
            get { return _reader; }
        }

        public bool IsNull(int index)
        {
            return _reader.IsDBNull(index);
        }

        #region Default Null Values

        public int GetInt32(int i)
        {
            return _reader.IsDBNull(i) ? 0 : _reader.GetInt32(i);
        }

        public byte GetByte(int i)
        {
            return _reader.IsDBNull(i) ? (byte)0 : _reader.GetByte(i);
        }

        public decimal GetDecimal(int i)
        {
            return _reader.IsDBNull(i) ? 0 : _reader.GetDecimal(i);
        }

        public decimal GetDecimal(string sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (decimal)0 : Convert.ToDecimal(_reader[sFieldName]);
        }

        public long GetInt64(int i)
        {
            return _reader.IsDBNull(i) ? (long)0 : _reader.GetInt64(i);
        }

        public double GetDouble(int i)
        {
            return _reader.IsDBNull(i) ? 0 : _reader.GetDouble(i);
        }

        public bool GetBoolean(int i)
        {
            return _reader.IsDBNull(i) ? false : _reader.GetBoolean(i);
        }

        public Guid GetGuid(int i)
        {
            return _reader.IsDBNull(i) ? Guid.Empty : _reader.GetGuid(i);
        }

        public DateTime GetDateTime(int i)
        {
            return _reader.IsDBNull(i) ? DateTime.MinValue : _reader.GetDateTime(i);
        }

        public float GetFloat(int i)
        {
            return _reader.IsDBNull(i) ? 0 : _reader.GetFloat(i);
        }

        public string GetString(int i)
        {
            return _reader.IsDBNull(i) ? null : _reader.GetString(i);
        }

        public char GetChar(int i)
        {
            return _reader.IsDBNull(i) ? '\0' : _reader.GetChar(i);
        }

        public short GetInt16(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (Int16)0 : Convert.ToInt16(_reader[sFieldName]);
        }

        public int GetInt32(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (Int32)0 : Convert.ToInt32(_reader[sFieldName]);
        }

        public byte GetByte(String sFieldName)
        {
            return _reader[sFieldName] == DBNull.Value ? (byte)0 : Convert.ToByte(_reader[sFieldName]);
        }

        public long GetInt64(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (Int64)0 : Convert.ToInt64(_reader[sFieldName]);
        }

        public Double GetDouble(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (Double)0 : Convert.ToDouble(_reader[sFieldName]);
        }

        public bool GetBoolean(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? false : Convert.ToBoolean(_reader[sFieldName]);
        }

        public DateTime GetDateTime(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? DateTime.MinValue : Convert.ToDateTime(_reader[sFieldName]);
        }

        public char GetChar(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? '\0' : Convert.ToChar(_reader[sFieldName]);
        }

        public string GetString(String sFieldName)
        {
            return (_reader[sFieldName] == DBNull.Value) ? (string)"" : Convert.ToString(_reader[sFieldName]);
        }

        //public Image GetImage(String sFieldName)
        //{
        //    try
        //    {
        //        byte[] imageData = null;
        //        long byteSize = 0;
        //        byteSize = _reader.GetBytes(_reader.GetOrdinal(sFieldName), 0, null, 0, 0);

        //        imageData = new byte[byteSize];
        //        long bytesread = 0;
        //        int curpos = 0, chunkSize = 500;
        //        while (bytesread < byteSize)
        //        {
        //            // chunkSize is an arbitrary application defined value 
        //            bytesread += _reader.GetBytes(_reader.GetOrdinal(sFieldName), curpos, imageData, curpos, chunkSize);
        //            curpos += chunkSize;
        //        }

        //        byte[] imgData = imageData;

        //        MemoryStream ms = new MemoryStream(imgData);
        //        Image oImage = Image.FromStream((Stream)ms);
        //        return oImage;
        //    }
        //    catch (Exception ex)
        //    {
        //        throw new Exception("Failed to get Image: " + ex.Message);
        //    }
        //}

        #endregion

        #region Parameterized Null Value

        public int GetInt32(int i, int valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetInt32(i);
        }

        public byte GetByte(int i, byte valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetByte(i);
        }

        public decimal GetDecimal(int i, decimal valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetDecimal(i);
        }

        public long GetInt64(int i, long valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetInt64(i);
        }

        public double GetDouble(int i, double valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetDouble(i);
        }

        public bool GetBoolean(int i, bool valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetBoolean(i);
        }

        public Guid GetGuid(int i, Guid valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetGuid(i);
        }

        public DateTime GetDateTime(int i, DateTime valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetDateTime(i);
        }

        public float GetFloat(int i, float valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetFloat(i);
        }

        public string GetString(int i, string valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetString(i);
        }

        public char GetChar(int i, char valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetChar(i);
        }

        public short GetInt16(int i, short valueIfNull)
        {
            return _reader.IsDBNull(i) ? valueIfNull : _reader.GetInt16(i);
        }

        #endregion
    }

    #endregion
}