// Copyright (c) 2009 Sun Microsystems, Inc.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using System.Data.Common;
using MySql.Data.MySqlClient;
using System.Collections;
using System.Data;
using System.Data.Metadata.Edm;
using System.Globalization;
using System.Text;

namespace MySql.Data.Entity
{
    class EFMySqlDataReader : DbDataReader
    {
        private EFMySqlCommand command;
        private MySqlDataReader reader;
        private PrimitiveType[] types;

        public EFMySqlDataReader(EFMySqlCommand cmd, MySqlDataReader wrappedReader)
        {
            command = cmd;
            reader = wrappedReader;
            types = command.ColumnTypes;
        }

        #region Properties

        public override int Depth
        {
            get { return reader.Depth; }
        }

        public override int FieldCount
        {
            get { return reader.FieldCount; }
        }

        public override bool HasRows
        {
            get { return reader.HasRows; }
        }

        public override bool IsClosed
        {
            get { return reader.IsClosed; }
        }

        public override int RecordsAffected
        {
            get { return reader.RecordsAffected; }
        }

        public override object this[string name]
        {
            get { return GetValue(GetOrdinal(name)); }
        }

        public override object this[int ordinal]
        {
            get { return GetValue(ordinal); }
        }

        #endregion

        public override void Close()
        {
            GC.SuppressFinalize(this);
            reader.Close();
        }

        public override bool GetBoolean(int ordinal)
        {
            return (bool)GetValue(ordinal);
        }

        public override byte GetByte(int ordinal)
        {
            return reader.GetByte(ordinal);
        }

        public override long GetBytes(int ordinal, long dataOffset, byte[] buffer, int bufferOffset, int length)
        {
            return reader.GetBytes(ordinal, dataOffset, buffer, bufferOffset, length);
        }

        public override char GetChar(int ordinal)
        {
            return reader.GetChar(ordinal);
        }

        public override long GetChars(int ordinal, long dataOffset, char[] buffer, int bufferOffset, int length)
        {
            return reader.GetChars(ordinal, dataOffset, buffer, bufferOffset, length);
        }

        public override string GetDataTypeName(int ordinal)
        {
            if (types != null)
                return types[ordinal].Name;
            return reader.GetDataTypeName(ordinal);
        }

        public override DateTime GetDateTime(int ordinal)
        {
            return reader.GetDateTime(ordinal);
        }

        public override decimal GetDecimal(int ordinal)
        {
            return reader.GetDecimal(ordinal);
        }

        public override double GetDouble(int ordinal)
        {
            return reader.GetDouble(ordinal);
        }

        public override IEnumerator GetEnumerator()
        {
            return reader.GetEnumerator();
        }

        public override Type GetFieldType(int ordinal)
        {
            if (types != null)
                return types[ordinal].ClrEquivalentType;
            return reader.GetFieldType(ordinal);
        }

        public override float GetFloat(int ordinal)
        {
            return reader.GetFloat(ordinal);
        }

        public override Guid GetGuid(int ordinal)
        {
            return reader.GetGuid(ordinal);
        }

        public override short GetInt16(int ordinal)
        {
            return reader.GetInt16(ordinal);
        }

        public override int GetInt32(int ordinal)
        {
            return reader.GetInt32(ordinal);
        }

        public override long GetInt64(int ordinal)
        {
            return reader.GetInt64(ordinal);
        }

        public override string GetName(int ordinal)
        {
            return reader.GetName(ordinal);
        }

        public override int GetOrdinal(string name)
        {
            return reader.GetOrdinal(name);
        }

        public override DataTable GetSchemaTable()
        {
            return reader.GetSchemaTable();
        }

        public override string GetString(int ordinal)
        {
            return reader.GetString(ordinal);
        }

        public override object GetValue(int ordinal)
        {
            object value = reader.GetValue(ordinal);

            if (types != null)
            {
                if (!(value is DBNull) && value.GetType()
                    != types[ordinal].ClrEquivalentType)
                    value = ChangeType(value, types[ordinal].ClrEquivalentType);
            }
            return value;
        }

        private object ChangeType(object sourceValue, Type targetType)
        {
            if (sourceValue is byte[])
            {
				if (targetType == typeof(Guid))
					return new Guid((byte[])sourceValue);
				else if (targetType == typeof(bool))
				{
					byte[] bytes = (byte[])sourceValue;
					return bytes[0] == '1';
				}
            }

            if (sourceValue is DateTime && targetType == typeof(DateTimeOffset))
            {
                return new DateTimeOffset((DateTime)sourceValue);
            }

            return Convert.ChangeType(sourceValue, targetType, CultureInfo.InvariantCulture);
        } 

        public override int GetValues(object[] values)
        {
            for (int i = 0; i < values.Length; ++i)
                values[i] = GetValue(i);
            return values.Length;
        }

        public override bool IsDBNull(int ordinal)
        {
            return reader.IsDBNull(ordinal);
        }

        public override bool NextResult()
        {
            return reader.NextResult();
        }

        public override bool Read()
        {
            return reader.Read();
        }

        protected override void Dispose(bool disposing)
        {
            GC.SuppressFinalize(this);
            if (disposing)
                reader.Dispose();
            base.Dispose(disposing);
        }

    }
}