// This file (UnitExcludesRequirement.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>
	/// Summary description for UnitExcludesRequirement.
	/// </summary>
	public class UnitExcludesRequirement : UnitRequirement
	{
		private UnitRequirementItem[] excludingTypes;

		public UnitExcludesRequirement(UnitType type, UnitRequirementItem[] excludingUnitTypes) : base(type)
		{
			excludingTypes = excludingUnitTypes;
		}

		public override string Description
		{
			get 
			{
				return "Some units are already included that excluded this unit";
			}
		}

		protected override AbstractFailedRequirement CanAddToArmy(Army army, UnitType type)
		{		
			FailedUnitRequirement failed = null;

			for (int i = 0; i<excludingTypes.Length; i++)
			{
				if (army.GetUnitTypeCount(excludingTypes[i].UnitType) > 0)
				{
					failed = new FailedUnitRequirement(this);
					break;
				}
			}
			
			return failed;
		}

		protected override AbstractFailedRequirement CanRemoveFromArmy(Army army, UnitType type)
		{
			return null;
		}

	}
}