territory claiming

microservices/LocationsApi/Controllers/LocationsController.cs

@@ -11,10 +11,12 @@ namespace LocationsApi.Controllers;
 public class LocationsController : ControllerBase
 {
     private readonly LocationService _locations;
+    private readonly UnitTrainingService _units;
 
-    public LocationsController(LocationService locations)
+    public LocationsController(LocationService locations, UnitTrainingService units)
     {
         _locations = locations;
+        _units = units;
     }
 
     [Authorize(Roles = "USER,SUPER")]
@@ -86,6 +88,22 @@ public class LocationsController : ControllerBase
             return NotFound();
         }
 
+        var existingLocation = await _locations.GetAsync(request.Q, request.R);
+        if (existingLocation is not null && !string.IsNullOrWhiteSpace(existingLocation.OwnerUsername))
+        {
+            if (string.Equals(existingLocation.OwnerUsername, username, StringComparison.OrdinalIgnoreCase))
+            {
+                return Ok(LocationResponse.FromLocation(existingLocation));
+            }
+
+            return Conflict("Location is already controlled by another player.");
+        }
+
+        if (!User.IsInRole("SUPER") && !await _units.TryConsumeCompletedScoutAsync(username))
+        {
+            return BadRequest("A completed scout is required to claim unclaimed territory.");
+        }
+
         var location = await _locations.ClaimAsync(request.Q, request.R, username);
         if (location is null)
         {