// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
//
// Authors:
//		Atsushi Enomoto  <atsushi@ximian.com>
//		Antonello Provenzano  <antonello@deveel.com>
//

using System;
using System.Collections.ObjectModel;

namespace System.Linq.Expressions
{
	public class LambdaExpression : Expression
	{
		#region .ctor
		internal LambdaExpression(Expression body, Type type, ReadOnlyCollection<ParameterExpression> parameters)
			: base(ExpressionType.Lambda, type)
		{
			this.body = body;
			this.parameters = parameters;
		}
		#endregion

		#region Fields
		private Expression body;
		private ReadOnlyCollection<ParameterExpression> parameters;
		#endregion

		#region Properties
		public Expression Body
		{
			get { return body; }
		}

		public ReadOnlyCollection<ParameterExpression> Parameters
		{
			get { return parameters; }
		}
		#endregion

		#region Internal Methods
		internal override void BuildString(System.Text.StringBuilder builder)
		{
			int parc = parameters.Count;

			if (parc > 1)
				builder.Append("(");

			for (int i = 0; i < parc; i++)
			{
				parameters[i].BuildString(builder);

				if (i < parc - 1)
					builder.Append(", ");
			}

			if (parc > 1)
				builder.Append(")");

			builder.Append(" => ");
			body.BuildString(builder);
		}
		#endregion

		#region Public Methods
		public Delegate Compile()
		{
			//TODO: maybe we should call the ExpressionCompiler here...
			throw new NotImplementedException();
		}
		#endregion
	}
}