/*
 *    The contents of this file are subject to the Initial
 *    Developer's Public License Version 1.0 (the "License");
 *    you may not use this file except in compliance with the
 *    License. You may obtain a copy of the License at
 *    https://github.com/FirebirdSQL/NETProvider/blob/master/license.txt.
 *
 *    Software distributed under the License is distributed on
 *    an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
 *    express or implied. See the License for the specific
 *    language governing rights and limitations under the License.
 *
 *    All Rights Reserved.
 */

//$Authors = Jiri Cincura (jiri@cincura.net)

using System;
using System.IO;
using System.Text;

namespace EntityFramework.Firebird.SqlGen
{
	internal class SqlWriter : StringWriter
	{
		#region Fields

		// We start at -1, since the first select statement will increment it to 0.
		private int _indent = -1;
		private bool _atBeginningOfLine = true;

		#endregion

		#region Properties

		/// <summary>
		/// The number of tabs to be added at the beginning of each new line.
		/// </summary>
		internal int Indent
		{
			get { return _indent; }
			set { _indent = value; }
		}

		#endregion

		#region Constructors

		/// <summary>
		///
		/// </summary>
		/// <param name="b"></param>
		public SqlWriter(StringBuilder b)
			: base(b, System.Globalization.CultureInfo.InvariantCulture)
		{
		}

		#endregion

		#region Methods

		/// <summary>
		/// Reset atBeginningofLine if we detect the newline string.
		/// <see cref="SqlBuilder.AppendLine"/>
		/// Add as many tabs as the value of indent if we are at the
		/// beginning of a line.
		/// </summary>
		/// <param name="value"></param>
		public override void Write(string value)
		{
			if (value == Environment.NewLine)
			{
				base.WriteLine();
				_atBeginningOfLine = true;
			}
			else
			{
				if (_atBeginningOfLine)
				{
					if (_indent > 0)
					{
						base.Write(new string('\t', _indent));
					}
					_atBeginningOfLine = false;
				}
				base.Write(value);
			}
		}

		public override void WriteLine()
		{
			base.WriteLine();
			_atBeginningOfLine = true;
		}

		public override void WriteLine(string value)
		{
			Write(value);
			WriteLine();
		}

		#endregion
	}
}
