Send this week's Outlook events to a Telegram group

GRAPH = "https://graph.microsoft.com/v1.0"
TG = "https://api.telegram.org"
from datetime import datetime, timedelta, timezone
from clickruntime import on_trigger, credentials, http

GROUP_CHAT_ID = -1001234567890

@on_trigger
def run(event):
    now = datetime.now(timezone.utc).replace(hour=0, minute=0, second=0, microsecond=0)
    h = {"Authorization": f"Bearer {credentials.connection('microsoft', 'work')}", "Prefer": 'outlook.timezone="UTC"'}
    events = http.get(f"{GRAPH}/me/calendarView", headers=h, params={"startDateTime": now.isoformat(),
                      "endDateTime": (now + timedelta(days=7)).isoformat(), "$orderby": "start/dateTime", "$top": 100}).json()["value"]
    buckets = {"Today": [], "Tomorrow": [], "This week": []}
    for e in events:
        start = datetime.fromisoformat(e["start"]["dateTime"][:19])
        days = (start.date() - now.date()).days
        key = "Today" if days == 0 else "Tomorrow" if days == 1 else "This week"
        title = "Busy" if e.get("sensitivity") == "private" else e["subject"]
        buckets[key].append(f"{start:%a %H:%M} {title}")
    text = "\n\n".join(f"{k}:\n" + ("\n".join(v) or "Nothing scheduled") for k, v in buckets.items())
    http.post(f"{TG}/bot{credentials.secret('TELEGRAM_BOT_TOKEN')}/sendMessage", json={"chat_id": GROUP_CHAT_ID, "text": text})
    return {"events": len(events)}