Book meeting requests into Google Calendar and tell Slack

from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from datetime import datetime, timedelta
from clickruntime import on_event, credentials, notify

@on_event
def handle(event):
    r = event.json or {}
    start = datetime.fromisoformat(r["start"])
    end = start + timedelta(minutes=int(r.get("minutes", 30)))
    cal = build("calendar", "v3", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False)
    busy = cal.freebusy().query(body={"timeMin": start.isoformat(), "timeMax": end.isoformat(),
                                      "items": [{"id": "primary"}]}).execute()["calendars"]["primary"]["busy"]
    if busy:
        notify.slack(f"⚠️ {r['name']} asked for {start:%a %d %b %H:%M}, but that slot is taken.", channel="#bookings")
        return {"booked": False}
    cal.events().insert(calendarId="primary", conferenceDataVersion=1, sendUpdates="all", body={
        "summary": f"Call with {r['name']}", "description": r.get("message", ""),
        "start": {"dateTime": start.isoformat()}, "end": {"dateTime": end.isoformat()},
        "attendees": [{"email": r["email"]}],
        "conferenceData": {"createRequest": {"requestId": event.event_id}}}).execute()
    notify.slack(f"📅 Booked: {r['name']} ({r.get('company', '')}) on {start:%a %d %b %H:%M}", channel="#bookings")
    return {"booked": True}