//
// System.Data.Common.DbDataAdapter.cs
//
// Author:
//   Rodrigo Moya (rodrigo@ximian.com)
//   Tim Coleman (tim@timcoleman.com)
//
// (C) Ximian, Inc
// Copyright (C) 2002 Tim Coleman
//

using System.Data;

namespace System.Data.Common
{
	/// <summary>
	/// Aids implementation of the IDbDataAdapter interface. Inheritors of DbDataAdapter  implement a set of functions to provide strong typing, but inherit most of the functionality needed to fully implement a DataAdapter.
	/// </summary>
	public abstract class DbDataAdapter : DataAdapter, ICloneable
	{
		#region Fields

		public const string DefaultSourceTableName = "Table";

		protected IDbCommand selectCommand;
		protected IDbCommand insertCommand;
		protected IDbCommand deleteCommand;
		protected IDbCommand updateCommand;

		#endregion

		#region Constructors

		protected DbDataAdapter() 
		{
		}

		#endregion

		#region Properties

		public IDbCommand SelectCommand {
			get { return selectCommand; }
			set { selectCommand = value; }
		}

		public IDbCommand InsertCommand {
			get { return insertCommand; }
			set { insertCommand = value; }
		}

		public IDbCommand DeleteCommand {
			get { return deleteCommand; }
			set { deleteCommand = value; }
		}

		public IDbCommand UpdateCommand {
			get { return updateCommand; }
			set { updateCommand = value; }
		}

		#endregion

		#region Methods

                public override int Fill (DataSet dataSet)
                {
			return Fill (dataSet, DefaultSourceTableName);
                }

		public int Fill (DataTable dataTable) 
		{
			return Fill (dataTable.DataSet, dataTable.TableName);
		}

		public int Fill (DataSet dataSet, string srcTable) 
		{
			return Fill (dataSet, 0, 0, srcTable);
		}

		protected virtual int Fill (DataTable dataTable, IDataReader dataReader) 
		{
			return Fill (dataTable.DataSet, dataTable.TableName, dataReader, 0, 0);
		}

		protected virtual int Fill (DataTable dataTable, IDbCommand command, CommandBehavior behavior) 
		{
			return Fill (dataTable.DataSet, 0, 0, dataTable.TableName, command, behavior);
		}

		public int Fill (DataSet dataSet, int startRecord, int maxRecords, string srcTable) 
		{
			return this.Fill (dataSet, startRecord, maxRecords, srcTable, selectCommand, CommandBehavior.Default);
		}

		protected virtual int Fill (DataSet dataSet, string srcTable, IDataReader dataReader, int startRecord, int maxRecords) 
		{
                        DataTable table;
                        int changeCount = 0;
			string tableName = srcTable;
                        int i = 0;

			if (startRecord < 0)
				throw new ArgumentException ("The startRecord parameter was less than 0.");
			if (maxRecords < 0)
				throw new ArgumentException ("The maxRecords parameter was less than 0.");

                        do
                        {
				if (dataSet.Tables.Contains (tableName))
                                {
                                        table = dataSet.Tables[tableName];
                                }
                                else // create a new table
                                {
                                        table = new DataTable (tableName);
                                        for (int j = 0; j < dataReader.FieldCount; j += 1)
                                        {
                                                string baseColumnName = dataReader.GetName (j);
                                                string columnName = "";

                                                if (baseColumnName == "")
                                                        baseColumnName = "Column";
                                                else
                                                        columnName = baseColumnName;

                                                for (int k = 1; table.Columns.Contains (columnName) || columnName == ""; k += 1)
                                                        columnName = String.Format ("{0}{1}", baseColumnName, k);

                                                table.Columns.Add (new DataColumn (columnName, dataReader.GetFieldType (j)));
                                        }
                                        dataSet.Tables.Add (table);
                                }

                                DataRow row;
                                object[] itemArray = new object[dataReader.FieldCount];

				// limit results for first results only.
				if (srcTable == tableName)
					for (int k = 0; k < startRecord; k += 1)
						dataReader.Read ();

                                while (dataReader.Read () && !(maxRecords > 0 && changeCount >= maxRecords && srcTable == tableName))
                                {
                                        // need to check for existing rows to reconcile if we have key
                                        // information.  skip this step for now

                                        // append rows to the end of the current table.
                                        dataReader.GetValues (itemArray);
					row = table.Rows.Add (itemArray);
					
					if (AcceptChangesDuringFill) 
						row.AcceptChanges ();

                                        changeCount += 1;
                                }

                                i += 1;
                                tableName = String.Format ("{0}{1}", srcTable, i);
                        } while (dataReader.NextResult ());

                        dataReader.Close ();
                        return changeCount;
		}

		protected virtual int Fill (DataSet dataSet, int startRecord, int maxRecords, string srcTable, IDbCommand command, CommandBehavior behavior) 
		{
			if (command.Connection.State == ConnectionState.Closed)
			{
				command.Connection.Open ();
				behavior |= CommandBehavior.CloseConnection;
			}
		
			return this.Fill (dataSet, srcTable, command.ExecuteReader (behavior), startRecord, maxRecords);
		}

		[MonoTODO]
		public override DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public DataTable FillSchema (DataTable dataTable, SchemaType schemaType) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType, string srcTable) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		protected virtual DataTable FillSchema (DataTable dataTable, SchemaType schemaType, IDbCommand command, CommandBehavior behavior) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		protected virtual DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType, IDbCommand command, string srcTable, CommandBehavior behavior) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public override IDataParameter[] GetFillParameters () 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public int Update (DataRow[] dataRows) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public override int Update (DataSet ds) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public int Update (DataTable dt) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		protected virtual int Update (DataRow[] row, DataTableMapping dtm) 
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public int Update (DataSet ds, string s) 
		{
			throw new NotImplementedException ();
		}

		protected abstract RowUpdatedEventArgs CreateRowUpdatedEvent (DataRow dataRow, IDbCommand command, StatementType statementType, DataTableMapping tableMapping);

		protected abstract RowUpdatingEventArgs CreateRowUpdatingEvent (DataRow dataRow, IDbCommand command, StatementType statementType, DataTableMapping tableMapping);

		[MonoTODO]
		protected virtual void OnFillError (FillErrorEventArgs value) 
		{
			throw new NotImplementedException ();
		}

		protected abstract void OnRowUpdated (RowUpdatedEventArgs value);
		protected abstract void OnRowUpdating (RowUpdatingEventArgs value);
		
		public event FillErrorEventHandler FillError;

		[MonoTODO]
		public object Clone ()
		{
			throw new NotImplementedException ();
		}

		#endregion
	}
}