Get a morning email of today's meetings with prep notes

import base64
from datetime import datetime, time, timezone
from email.message import EmailMessage
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from clickruntime import on_trigger, credentials, ai

def send(gmail, to, subject, text):
    msg = EmailMessage()
    msg["To"], msg["Subject"] = to, subject
    msg.set_content(text)
    gmail.users().messages().send(userId="me", body={"raw": base64.urlsafe_b64encode(msg.as_bytes()).decode()}).execute()

@on_trigger
def run(event):
    creds = Credentials(credentials.connection("google", "work"))
    today = datetime.now(timezone.utc).date()
    items = build("calendar", "v3", credentials=creds, cache_discovery=False).events().list(
        calendarId="primary", timeMin=datetime.combine(today, time.min, timezone.utc).isoformat(),
        timeMax=datetime.combine(today, time.max, timezone.utc).isoformat(), singleEvents=True, orderBy="startTime").execute()["items"]
    lines = [f"{e['start'].get('dateTime', 'All day')[11:16]} {e.get('summary', '')} with "
             f"{', '.join(a['email'] for a in e.get('attendees', []))}: {e.get('description', '')[:200]}" for e in items]
    brief = ai.generate("For each meeting, keep the time, title and attendees and add a one-line prep note:\n" + "\n".join(lines),
                        max_output_tokens=900).text if lines else "No meetings today."
    send(build("gmail", "v1", credentials=creds, cache_discovery=False), "me", f"Today: {len(items)} meetings", brief)
    return {"meetings": len(items)}