using System;
using System.Collections;
using Server;
using Server.Targeting;

namespace Server.Commands.Generic
{
	public class SingleCommandImplementor : BaseCommandImplementor
	{
		public SingleCommandImplementor()
		{
			Accessors = new string[]{ "Single" };
			SupportRequirement = CommandSupport.Single;
			AccessLevel = AccessLevel.Counselor;
			Usage = "Single <command>";
			Description = "Invokes the command on a single targeted object. This is the same as just invoking the command directly.";
		}

		public override void Register( BaseCommand command )
		{
			base.Register( command );

			for ( int i = 0; i < command.Commands.Length; ++i )
				CommandSystem.Register( command.Commands[i], command.AccessLevel, new CommandEventHandler( Redirect ) );
		}

		public void Redirect( CommandEventArgs e )
		{
			BaseCommand command = Commands[e.Command];

			if ( command == null )
				e.Mobile.SendMessage( "That is either an invalid command name or one that does not support this modifier." );
			else if ( e.Mobile.AccessLevel < command.AccessLevel )
				e.Mobile.SendMessage( "You do not have access to that command." );
			else if ( command.ValidateArgs( this, e ) )
				Process( e.Mobile, command, e.Arguments );
		}

		public override void Process( Mobile from, BaseCommand command, string[] args )
		{
			if ( command.ValidateArgs( this, new CommandEventArgs( from, command.Commands[0], GenerateArgString( args ), args ) ) )
				from.BeginTarget( -1, command.ObjectTypes == ObjectTypes.All, TargetFlags.None, new TargetStateCallback( OnTarget ), new object[]{ command, args } );
		}

		public void OnTarget( Mobile from, object targeted, object state )
		{
			if ( !BaseCommand.IsAccessible( from, targeted ) )
			{
				from.SendMessage( "That is not accessible." );
				return;
			}

			object[] states = (object[])state;
			BaseCommand command = (BaseCommand)states[0];
			string[] args = (string[])states[1];

			switch ( command.ObjectTypes )
			{
				case ObjectTypes.Both:
				{
					if ( !(targeted is Item) && !(targeted is Mobile) )
					{
						from.SendMessage( "This command does not work on that." );
						return;
					}

					break;
				}
				case ObjectTypes.Items:
				{
					if ( !(targeted is Item) )
					{
						from.SendMessage( "This command only works on items." );
						return;
					}

					break;
				}
				case ObjectTypes.Mobiles:
				{
					if ( !(targeted is Mobile) )
					{
						from.SendMessage( "This command only works on mobiles." );
						return;
					}

					break;
				}
			}

			RunCommand( from, targeted, command, args );
		}
	}
}