Manage your Google Calendar by messaging a Telegram bot

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

MY_CHAT_ID = 123456789

@on_event
def handle(event):
    m = (event.json or {}).get("message", {})
    if m.get("chat", {}).get("id") != MY_CHAT_ID or "text" not in m:
        return {"ignored": True}
    schema = {"type": "object", "properties": {"intent": {"enum": ["add", "list"]}, "title": {"type": "string"},
              "start": {"type": "string"}, "minutes": {"type": "integer"}}}
    p = ai.generate(f"Today is {datetime.now():%A %Y-%m-%d}. Parse this calendar request; start as ISO local time: {m['text']}",
                    json_schema=schema, max_output_tokens=150).json
    cal = build("calendar", "v3", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False).events()
    start = datetime.fromisoformat(p["start"])
    if p["intent"] == "add":
        end = start + timedelta(minutes=p.get("minutes") or 60)
        cal.insert(calendarId="primary", body={"summary": p["title"], "start": {"dateTime": start.isoformat(), "timeZone": "Europe/London"},
                   "end": {"dateTime": end.isoformat(), "timeZone": "Europe/London"}}).execute()
        reply = f"✅ Added {p['title']}, {start:%a %d %b %H:%M}"
    else:
        day = start.replace(hour=0, minute=0)
        items = cal.list(calendarId="primary", timeMin=day.isoformat() + "Z", timeMax=(day + timedelta(days=1)).isoformat() + "Z",
                         singleEvents=True, orderBy="startTime").execute().get("items", [])
        reply = "\n".join(f"{e['start'].get('dateTime', '')[11:16]} {e.get('summary', '')}" for e in items) or "Nothing on."
    http.post(f"https://api.telegram.org/bot{credentials.secret('TELEGRAM_BOT_TOKEN')}/sendMessage",
              json={"chat_id": MY_CHAT_ID, "text": reply})
    return {"intent": p["intent"]}