using System;

namespace Server.Commands.Generic
{
	public sealed class WhereExtension : BaseExtension
	{
		public static ExtensionInfo ExtInfo = new ExtensionInfo( 20, "Where", -1, delegate { return new WhereExtension(); } );

		public static void Initialize()
		{
			ExtensionInfo.Register( ExtInfo );
		}

		public override ExtensionInfo Info => ExtInfo;

		public ObjectConditional Conditional { get; private set; }

		public WhereExtension()
		{
		}

		public override void Optimize( Mobile from, Type baseType, ref AssemblyEmitter assembly )
		{
			if ( baseType == null )
				throw new InvalidOperationException( "Insanity." );

			Conditional.Compile( ref assembly );
		}

		public override void Parse( Mobile from, string[] arguments, int offset, int size )
		{
			if ( size < 1 )
				throw new Exception( "Invalid condition syntax." );

			Conditional = ObjectConditional.ParseDirect( from, arguments, offset, size );
		}

		public override bool IsValid( object obj )
		{
			return Conditional.CheckCondition( obj );
		}
	}
}