// This file (AbstractArmyRequirement.cs) is a part of the IBBoard.WarFoundry.API project and is copyright 2008, 2009 IBBoard.
//
// The file and the library/program it is in are licensed and distributed, without warranty, under the GNU Affero GPL license, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.

using System;
using System.Collections.Generic;
using IBBoard.WarFoundry.API.Objects;


namespace IBBoard.WarFoundry.API.Requirements
{	
	/// <summary>
	/// Abstract class for any requirement for adding an object to an army, e.g. adding units.
	/// </summary>
	public abstract class AbstractArmyRequirement : AbstractRequirement
	{		
		protected abstract AbstractFailedRequirement CanAddToArmy(Army army);
		protected abstract AbstractFailedRequirement CanRemoveFromArmy(Army army);
		
		public override AbstractFailedRequirement CanAddToWarFoundryObject (WarFoundryObject obj)
		{
			AbstractFailedRequirement fail = null;
			
			if (obj is Army)
			{
				fail = CanAddToArmy((Army)obj);
			}
			else
			{
				fail = new FailedRequirement(this);
			}
			
			return fail;
		}
		
		public override AbstractFailedRequirement CanRemoveFromWarFoundryObject (WarFoundryObject obj)
		{
			AbstractFailedRequirement fail = null;
			
			if (obj is Army)
			{
				fail = CanRemoveFromArmy((Army)obj);
			}
			else
			{
				fail = new FailedRequirement(this);
			}
			
			return fail;
		}
	}
}