support power impl pretty much done

OpenRa.Game/SupportPower.cs

@@ -3,6 +3,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using OpenRa.Game.GameRules;
+using OpenRa.Game.Traits;
+using OpenRa.Game.SupportPowers;
 
 namespace OpenRa.Game
 {
@@ -10,15 +12,25 @@ namespace OpenRa.Game
 	{
 		public readonly SupportPowerInfo Info;
 		public readonly Player Owner;
+		readonly ISupportPowerImpl Impl;
+
+		static ISupportPowerImpl ConstructPowerImpl(string implName)
+		{
+			var type = typeof(ISupportPowerImpl).Assembly.GetType(
+				typeof(ISupportPowerImpl).Namespace + "." + implName, true, false);
+			var ctor = type.GetConstructor(Type.EmptyTypes);
+			return (ISupportPowerImpl)ctor.Invoke(new object[] { });
+		}
 
 		public SupportPower(SupportPowerInfo info, Player owner)
 		{
 			Info = info;
 			Owner = owner;
-
 			RemainingTime = TotalTime = (int)info.ChargeTime * 60 * 25;
+			Impl = ConstructPowerImpl(info.Impl);
 		}
 
+		public bool IsUsed;
 		public bool IsAvailable { get; private set; }
 		public bool IsDone { get { return RemainingTime == 0; } }
 		public int RemainingTime { get; private set; }
@@ -26,6 +38,9 @@ namespace OpenRa.Game
 
 		public void Tick()
 		{
+			if (Info.OneShot && IsUsed)
+				return;
+
 			if (Info.GivenAuto)
 			{
 				var buildings = Rules.TechTree.GatherBuildings(Owner);
@@ -47,6 +62,25 @@ namespace OpenRa.Game
 
 		public void Activate()
 		{
+			if (Impl != null)
+				Impl.Activate(this);
+		}
+
+		public void FinishActivate()
+		{
+			if (Info.OneShot)
+			{
+				IsUsed = true; 
+				IsAvailable = false;
+			}
+			RemainingTime = TotalTime;
+		}
+
+		public void Give(bool requireCharge)		// called by crate/spy/etc code
+		{
+			IsAvailable = true;
+			IsUsed = false;
+			RemainingTime = requireCharge ? TotalTime : 0;
 		}
 	}
 }