Refactor bristol waste schedule code

agenda/waste_schedule.py

@@ -188,25 +188,38 @@ async def get_bristol_gov_uk_data(uprn: str) -> httpx.Response:
     return response
 
 
+def bristol_service(item: dict[str, typing.Any]) -> str:
+    """Bristol waste service name."""
+    service: str = item["containerName"]
+    return "Recycling" if "Recycling" in service else service.partition(" ")[2]
+
+
+def bristol_collections(item: dict[str, typing.Any]) -> typing.Iterable[date]:
+    """Bristol dates from collections."""
+    for collection in item["collection"]:
+        for collection_date_key in ["nextCollectionDate", "lastCollectionDate"]:
+            yield date.fromisoformat(collection[collection_date_key][:10])
+
+
+def bristol_by_date(data: BristolSchedule, start_date: date) -> dict[date, list[str]]:
+    """Build list of Bristol services by date."""
+    by_date: defaultdict[date, list[str]] = defaultdict(list)
+
+    for item in data:
+        service = bristol_service(item)
+        for d in bristol_collections(item):
+            if d < start_date and service not in by_date[d]:
+                by_date[d].append(service)
+    return by_date
+
+
 async def get_bristol_gov_uk(
     start_date: date, data_dir: str, uprn: str, refresh: bool = False
 ) -> list[Event]:
     """Get waste collection schedule from Bristol City Council."""
     data = await get_bristol_data(data_dir, uprn, refresh)
 
-    by_date: defaultdict[date, list[str]] = defaultdict(list)
+    by_date = bristol_by_date(data, start_date)
-
-    for item in data:
-        service = item["containerName"]
-        service = "Recycling" if "Recycling" in service else service.partition(" ")[2]
-        for collection in item["collection"]:
-            for collection_date_key in ["nextCollectionDate", "lastCollectionDate"]:
-                d = date.fromisoformat(collection[collection_date_key][:10])
-                if d < start_date:
-                    continue
-                if service not in by_date[d]:
-                    by_date[d].append(service)
-
     return [
         Event(name="waste_schedule", date=d, title="Bristol: " + ", ".join(services))
         for d, services in by_date.items()