diff --git a/google_calendar.py b/google_calendar.py
new file mode 100644
index 0000000..5500982
--- /dev/null
+++ b/google_calendar.py
@@ -0,0 +1,73 @@
+from datetime import datetime
+import os.path
+from base64 import b32hexencode
+
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from google_auth_oauthlib.flow import InstalledAppFlow
+from googleapiclient.discovery import build, Resource
+from googleapiclient.errors import HttpError
+
+# If modifying these scopes, delete the file token.json.
+SCOPES = [
+    "https://www.googleapis.com/auth/calendar.readonly",
+    "https://www.googleapis.com/auth/calendar.events",
+]
+
+CALENDAR_ID = "40e4v6t1s2spr9f1d9d45br3ik@group.calendar.google.com"
+
+
+def authenticate() -> Credentials:
+    creds = None
+    # The file token.json stores the user's access and refresh tokens, and is
+    # created automatically when the authorization flow completes for the first
+    # time.
+    if os.path.exists("token.json"):
+        creds = Credentials.from_authorized_user_file("token.json", SCOPES)
+    # If there are no (valid) credentials available, let the user log in.
+    if not creds or not creds.valid:
+        if creds and creds.expired and creds.refresh_token:
+            creds.refresh(Request())
+        else:
+            flow = InstalledAppFlow.from_client_secrets_file("credentials.json", SCOPES)
+            creds = flow.run_local_server(port=0)
+        # Save the credentials for the next run
+        with open("token.json", "w") as token:
+            token.write(creds.to_json())
+
+    return creds
+
+
+def get_service(creds: Credentials) -> Resource:
+    return build("calendar", "v3", credentials=creds)
+
+
+def insert_or_update_event(
+    service: Resource, id: str, title: str, start: datetime, end: datetime
+):
+    event_id = b32hexencode(id.encode("ascii")).decode("ascii").lower()
+    event = {
+        "id": event_id,
+        "summary": title,
+        "start": {
+            "dateTime": start.isoformat() + "Z",  # 'Z' indicates UTC time
+        },
+        "end": {
+            "dateTime": end.isoformat() + "Z",  # 'Z' indicates UTC time
+        },
+    }
+
+    print(f"Adding/updating event: {title}, start: {start}, end: {end}")
+
+    try:
+        service.events().update(
+            calendarId=CALENDAR_ID, eventId=event_id, body=event
+        ).execute()
+
+    except HttpError as error:
+        # Create event if it doesn't exist
+        if error.status_code == 409:
+            service.events().insert(calendarId=CALENDAR_ID, body=event).execute()
+
+        else:
+            raise
diff --git a/main.py b/main.py
index cb1da74..452c9ec 100644
--- a/main.py
+++ b/main.py
@@ -1,85 +1,20 @@
-import datetime
-import os.path
-from base64 import b32hexencode
+from datetime import datetime, timedelta
 
-from google.auth.transport.requests import Request
-from google.oauth2.credentials import Credentials
-from google_auth_oauthlib.flow import InstalledAppFlow
-from googleapiclient.discovery import build
-from googleapiclient.errors import HttpError
-
-# If modifying these scopes, delete the file token.json.
-SCOPES = ['https://www.googleapis.com/auth/calendar.readonly',
-          'https://www.googleapis.com/auth/calendar.events']
-
-CALENDAR_ID = '40e4v6t1s2spr9f1d9d45br3ik@group.calendar.google.com'
-
-
-def authenticate_google() -> Credentials:
-    creds = None
-    # The file token.json stores the user's access and refresh tokens, and is
-    # created automatically when the authorization flow completes for the first
-    # time.
-    if os.path.exists('token.json'):
-        creds = Credentials.from_authorized_user_file('token.json', SCOPES)
-    # If there are no (valid) credentials available, let the user log in.
-    if not creds or not creds.valid:
-        if creds and creds.expired and creds.refresh_token:
-            creds.refresh(Request())
-        else:
-            flow = InstalledAppFlow.from_client_secrets_file(
-                'credentials.json', SCOPES)
-            creds = flow.run_local_server(port=0)
-        # Save the credentials for the next run
-        with open('token.json', 'w') as token:
-            token.write(creds.to_json())
-
-    return creds
-
-
-def insert_or_update_event(service, id, title, start, end):
-    event_id = b32hexencode(id.encode('ascii')).decode('ascii').lower()
-    event = {
-        "id": event_id,
-        "summary": title,
-        "start": {
-            "dateTime": start.isoformat() + 'Z',  # 'Z' indicates UTC time
-        },
-        "end": {
-            "dateTime": end.isoformat() + 'Z',  # 'Z' indicates UTC time
-        },
-    }
-
-    print(f"Adding/updating event: {title}, start: {start}, end: {end}")
-
-    try:
-        service \
-            .events() \
-            .update(calendarId=CALENDAR_ID, eventId=event_id, body=event) \
-            .execute()
-
-    except HttpError as error:
-        # Create event if it doesn't exist
-        if error.status_code == 409:
-            service \
-                .events() \
-                .insert(calendarId=CALENDAR_ID, body=event) \
-                .execute()
-
-        else:
-            raise error
+import google_calendar
 
 
 def main():
-    creds = authenticate_google()
-    service = build('calendar', 'v3', credentials=creds)
+    creds = google_calendar.authenticate()
+    service = google_calendar.get_service(creds)
 
-    insert_or_update_event(service,
-                           "octoprint_test_event",
-                           "Test!",
-                           datetime.datetime.utcnow(),
-                           datetime.datetime.utcnow() + datetime.timedelta(hours=1))
+    google_calendar.insert_or_update_event(
+        service,
+        "octoprint_test_event",
+        "Test!",
+        datetime.utcnow(),
+        datetime.utcnow() + timedelta(hours=1),
+    )
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()