using System;
using System.Data;

using BLToolkit.Common;
using System.Data.SqlTypes;

namespace BLToolkit.Mapping
{
    public class ScalarDataReaderMapper : DataReaderMapper
    {
        public ScalarDataReaderMapper(
            MappingSchema         mappingSchema,
            IDataReader           dataReader,
            NameOrIndexParameter  nameOrIndex)
            : base(mappingSchema, dataReader)
        {
            _index = nameOrIndex.ByName? dataReader.GetOrdinal(nameOrIndex.Name): nameOrIndex.Index;
        }

        private readonly int _index;
        public           int  Index
        {
            get { return _index; }
        }

        #region IMapDataSource Members

        public override int Count
        {
            get { return 1; }
        }

        public override Type GetFieldType(int index)
        {
            return DataReader.GetFieldType(_index);
        }

        public override string GetName(int index)
        {
            return DataReader.GetName(_index);
        }

        public override object GetValue(object o, int index)
        {
            return base.GetValue(o, _index);
        }

        public override object GetValue(object o, string name)
        {
            return base.GetValue(o, _index);
        }

        public override bool     IsNull     (object o, int index) { return DataReader.IsDBNull(_index); }

        // Simple type getters.
        //
        [CLSCompliant(false)]
        public override SByte    GetSByte   (object o, int index) { return base.GetSByte(o, _index); }
        public override Int16    GetInt16   (object o, int index) { return DataReader.GetInt16   (_index); }
        public override Int32    GetInt32   (object o, int index) { return DataReader.GetInt32   (_index); }
        public override Int64    GetInt64   (object o, int index) { return DataReader.GetInt64   (_index); }

        public override Byte     GetByte    (object o, int index) { return DataReader.GetByte    (_index); }
        [CLSCompliant(false)]
        public override UInt16   GetUInt16  (object o, int index) { return base.GetUInt16(o, _index); }
        [CLSCompliant(false)]
        public override UInt32   GetUInt32  (object o, int index) { return base.GetUInt32(o, _index); }
        [CLSCompliant(false)]
        public override UInt64   GetUInt64  (object o, int index) { return base.GetUInt64(o, _index); }

        public override Boolean  GetBoolean (object o, int index) { return DataReader.GetBoolean (_index); }
        public override Char     GetChar    (object o, int index) { return DataReader.GetChar    (_index); }
        public override Single   GetSingle  (object o, int index) { return DataReader.GetFloat   (_index); }
        public override Double   GetDouble  (object o, int index) { return DataReader.GetDouble  (_index); }
        public override Decimal  GetDecimal (object o, int index) { return DataReader.GetDecimal (_index); }
        public override Guid     GetGuid    (object o, int index) { return DataReader.GetGuid    (_index); }
        public override DateTime GetDateTime(object o, int index) { return DataReader.GetDateTime(_index); }
#if FW3
        public override DateTimeOffset GetDateTimeOffset(object o, int index) { return DataReader.GetDateTime(_index); }
#endif
        // Nullable type getters.
        //
        [CLSCompliant(false)]
        public override SByte?    GetNullableSByte   (object o, int index) { return base.GetNullableSByte(o, _index); }
        public override Int16?    GetNullableInt16   (object o, int index) { return DataReader.IsDBNull(_index)? null: (Int16?)DataReader.GetInt16   (_index); }
        public override Int32?    GetNullableInt32   (object o, int index) { return DataReader.IsDBNull(_index)? null: (Int32?)DataReader.GetInt32   (_index); }
        public override Int64?    GetNullableInt64   (object o, int index) { return DataReader.IsDBNull(_index)? null: (Int64?)DataReader.GetInt64   (_index); }

        public override Byte?     GetNullableByte    (object o, int index) { return DataReader.IsDBNull(_index)? null: (Byte?) DataReader.GetByte    (_index); }
        [CLSCompliant(false)]
        public override UInt16?   GetNullableUInt16  (object o, int index) { return base.GetNullableUInt16(o, _index); }
        [CLSCompliant(false)]
        public override UInt32?   GetNullableUInt32  (object o, int index) { return base.GetNullableUInt32(o, _index); }
        [CLSCompliant(false)]
        public override UInt64?   GetNullableUInt64  (object o, int index) { return base.GetNullableUInt64(o, _index); }

        public override Boolean?  GetNullableBoolean (object o, int index) { return DataReader.IsDBNull(_index)? null: (Boolean?) DataReader.GetBoolean (_index); }
        public override Char?     GetNullableChar    (object o, int index) { return DataReader.IsDBNull(_index)? null: (Char?)    DataReader.GetChar    (_index); }
        public override Single?   GetNullableSingle  (object o, int index) { return DataReader.IsDBNull(_index)? null: (Single?)  DataReader.GetFloat   (_index); }
        public override Double?   GetNullableDouble  (object o, int index) { return DataReader.IsDBNull(_index)? null: (Double?)  DataReader.GetDouble  (_index); }
        public override Decimal?  GetNullableDecimal (object o, int index) { return DataReader.IsDBNull(_index)? null: (Decimal?) DataReader.GetDecimal (_index); }
        public override Guid?     GetNullableGuid    (object o, int index) { return DataReader.IsDBNull(_index)? null: (Guid?)    DataReader.GetGuid    (_index); }
        public override DateTime? GetNullableDateTime(object o, int index) { return DataReader.IsDBNull(_index)? null: (DateTime?)DataReader.GetDateTime(_index); }
#if FW3
        public override DateTimeOffset? GetNullableDateTimeOffset(object o, int index) { return DataReader.IsDBNull(_index)? null: (DateTimeOffset?)DataReader.GetDateTime(_index); }
#endif

        // SQL type getters.
        //
        public override SqlByte     GetSqlByte    (object o, int index) { return DataReader.IsDBNull(_index)? SqlByte.    Null: DataReader.GetByte    (_index); }
        public override SqlInt16    GetSqlInt16   (object o, int index) { return DataReader.IsDBNull(_index)? SqlInt16.   Null: DataReader.GetInt16   (_index); }
        public override SqlInt32    GetSqlInt32   (object o, int index) { return DataReader.IsDBNull(_index)? SqlInt32.   Null: DataReader.GetInt32   (_index); }
        public override SqlInt64    GetSqlInt64   (object o, int index) { return DataReader.IsDBNull(_index)? SqlInt64.   Null: DataReader.GetInt64   (_index); }
        public override SqlSingle   GetSqlSingle  (object o, int index) { return DataReader.IsDBNull(_index)? SqlSingle.  Null: DataReader.GetFloat   (_index); }
        public override SqlBoolean  GetSqlBoolean (object o, int index) { return DataReader.IsDBNull(_index)? SqlBoolean. Null: DataReader.GetBoolean (_index); }
        public override SqlDouble   GetSqlDouble  (object o, int index) { return DataReader.IsDBNull(_index)? SqlDouble.  Null: DataReader.GetDouble  (_index); }
        public override SqlDateTime GetSqlDateTime(object o, int index) { return DataReader.IsDBNull(_index)? SqlDateTime.Null: DataReader.GetDateTime(_index); }
        public override SqlDecimal  GetSqlDecimal (object o, int index) { return DataReader.IsDBNull(_index)? SqlDecimal. Null: DataReader.GetDecimal (_index); }
        public override SqlMoney    GetSqlMoney   (object o, int index) { return DataReader.IsDBNull(_index)? SqlMoney.   Null: DataReader.GetDecimal (_index); }
        public override SqlGuid     GetSqlGuid    (object o, int index) { return DataReader.IsDBNull(_index)? SqlGuid.    Null: DataReader.GetGuid    (_index); }
        public override SqlString   GetSqlString  (object o, int index) { return DataReader.IsDBNull(_index)? SqlString.  Null: DataReader.GetString  (_index); }

        #endregion
    }
}