Add main_filter to Observatory

src/adam_test_data/observatory.py

@@ -67,6 +67,7 @@ class Observatory:
     bright_limit: list[float]
     fov: FieldOfView
     simulation: Simulation
+    main_filter: str
 
 
 def observatory_to_sorcha_config(
@@ -92,6 +93,15 @@ def observatory_to_sorcha_config(
     if time_range is not None:
         sql_query += f" AND observationStartMJD >= {time_range[0]} AND observationStartMJD <= {time_range[1]}"
 
+    # The main filter needs to be first in the list of filters
+    if observatory.main_filter in observatory.filters:
+        observatory.filters.remove(observatory.main_filter)
+        observatory.filters.insert(0, observatory.main_filter)
+    else:
+        raise ValueError(
+            f"Main filter {observatory.main_filter} not in list of filters"
+        )
+
     config = f"""
 # Sorcha Configuration File - ADAM Test Data - {observatory.code}
 

src/adam_test_data/tests/test_observatory.py

@@ -108,6 +108,7 @@ def test_observatory_to_sorcha_config():
         bright_limit=[16, 16, 16, 16, 16, 16],
         fov=FieldOfView(camera_model="circle", fill_factor=0.9, circle_radius=3),
         simulation=Simulation(ang_fov=1.0, fov_buffer=0.1),
+        main_filter="r",
     )
 
     assert (
@@ -130,7 +131,7 @@ def test_observatory_to_sorcha_config():
 ar_healpix_order = 6
 
 [FILTERS]
-observing_filters = u,g,r,i,z,y
+observing_filters = r,u,g,i,z,y
 
 [BRIGHT_LIMITS]
 bright_limit = 16,16,16,16,16,16
@@ -164,3 +165,19 @@ def test_observatory_to_sorcha_config():
 trailing_losses_on = True
 """
     )
+
+
+def test_observatory_to_sorcha_config_raises():
+    # Test that observatory_to_sorcha_config raises the correct exceptions when invalid argument
+    # combinations are passed.
+
+    with pytest.raises(ValueError, match="Main filter r not in list of filters"):
+        obs = Observatory(
+            code="X05",
+            filters=["u", "g", "i", "z", "y"],
+            bright_limit=[16, 16, 16, 16, 16, 16],
+            fov=FieldOfView(camera_model="circle", fill_factor=0.9, circle_radius=3),
+            simulation=Simulation(ang_fov=1.0, fov_buffer=0.1),
+            main_filter="r",
+        )
+        observatory_to_sorcha_config(obs)