Fixed harvesters for AI to search the entire map when no more resources nearby.

OpenRA.Mods.RA/AI/HackyAI.cs

@@ -260,6 +260,25 @@ namespace OpenRA.Mods.RA.AI
 			else
 				assignRolesTicks = Info.AssignRolesInterval;
 
+			// Find idle harvesters and give them orders:
+			foreach (var a in activeUnits)
+			{
+				var harv = a.TraitOrDefault<Harvester>();
+				if (harv == null) continue;
+				if (!a.IsIdle)
+				{
+					Activity act = a.GetCurrentActivity();
+					// A Wait activity is technically idle:
+					if ((act.GetType() != typeof(OpenRA.Mods.RA.Activities.Wait)) &&
+						(act.NextActivity == null || act.NextActivity.GetType() != typeof(OpenRA.Mods.RA.Activities.FindResources)))
+						continue;
+				}
+				if (!harv.IsEmpty) continue;
+
+				// Tell the idle harvester to quit slacking:
+				world.IssueOrder(new Order("Harvest", a, false));
+			}
+
 			var newUnits = self.World.ActorsWithTrait<IMove>()
 				.Where(a => a.Actor.Owner == p && !a.Actor.HasTrait<BaseBuilding>()
 					&& !activeUnits.Contains(a.Actor))

OpenRA.Mods.RA/Activities/FindResources.cs

@@ -20,7 +20,7 @@ namespace OpenRA.Mods.RA.Activities
 {
 	public class FindResources : Activity
 	{
-		CPos avoidCell;
+		CPos? avoidCell;
 
 		public FindResources()
 		{
@@ -64,7 +64,8 @@ namespace OpenRA.Mods.RA.Activities
 					})
 					.WithHeuristic(loc =>
 					{
-						if (loc == avoidCell) return 1;
+						// Avoid this cell:
+						if (avoidCell.HasValue && loc == avoidCell.Value) return 1;
 
 						// Don't harvest out of range:
 						int distSquared = (loc - (harv.LastOrderLocation ?? harv.LinkedProc.Location)).LengthSquared;

OpenRA.Mods.RA/Harvester.cs

@@ -268,6 +268,20 @@ namespace OpenRA.Mods.RA
 
 					LastOrderLocation = loc;
 				}
+				else
+				{
+					// A bot order gives us a CPos.Zero TargetLocation, so find some good resources for him:
+					CPos? loc = FindNextResourceForBot(self);
+					// No more resources? Oh well.
+					if (!loc.HasValue)
+						return;
+
+					self.QueueActivity(mobile.MoveTo(loc.Value, 0));
+					self.SetTargetLine(Target.FromCell(loc.Value), Color.Red);
+
+					LastOrderLocation = loc;
+				}
+
 				self.QueueActivity(new FindResources());
 			}
 			else if (order.OrderString == "Deliver")
@@ -290,6 +304,42 @@ namespace OpenRA.Mods.RA
 			}
 		}
 
+		CPos? FindNextResourceForBot(Actor self)
+		{
+			// NOTE: This is only used for the AI to find the next available resource to harvest.
+			var harvInfo = self.Info.Traits.Get<HarvesterInfo>();
+			var mobile = self.Trait<Mobile>();
+			var mobileInfo = self.Info.Traits.Get<MobileInfo>();
+			var resLayer = self.World.WorldActor.Trait<ResourceLayer>();
+			var territory = self.World.WorldActor.Trait<ResourceClaimLayer>();
+
+			// Find any harvestable resources:
+			var path = self.World.WorldActor.Trait<PathFinder>().FindPath(
+				PathSearch.Search(self.World, mobileInfo, self.Owner, true)
+					.WithHeuristic(loc =>
+					{
+						// Get the resource at this location:
+						var resType = resLayer.GetResource(loc);
+
+						if (resType == null) return 1;
+						// Can the harvester collect this kind of resource?
+						if (!harvInfo.Resources.Contains(resType.info.Name)) return 1;
+
+						// Another harvester has claimed this resource:
+						ResourceClaim claim;
+						if (territory.IsClaimedByAnyoneElse(self, loc, out claim)) return 1;
+
+						return 0;
+					})
+					.FromPoint(self.Location)
+			);
+
+			if (path.Count == 0)
+				return (CPos?)null;
+
+			return path[0];
+		}
+
 		public void OnNotifyResourceClaimLost(Actor self, ResourceClaim claim, Actor claimer)
 		{
 			if (self == claimer) return;