Build a daily timesheet from your calendar and sent email

from datetime import datetime, timedelta, timezone
from googleapiclient.discovery import build
from google.oauth2.credentials import Credentials
from clickruntime import on_trigger, credentials, notify, ai

CLIENTS = {"acme.example": "Acme", "northwind.example": "Northwind"}

@on_trigger
def run(event):
    creds = Credentials(credentials.connection("google", "work"))
    start = datetime.now(timezone.utc).replace(hour=0, minute=0, second=0)
    events = build("calendar", "v3", credentials=creds, cache_discovery=False).events().list(calendarId="primary",
             timeMin=start.isoformat(), timeMax=(start + timedelta(days=1)).isoformat(), singleEvents=True).execute()["items"]
    gmail = build("gmail", "v1", credentials=creds, cache_discovery=False).users()
    sent = gmail.messages().list(userId="me", q="in:sent newer_than:1d").execute().get("messages", [])
    lines = [f"Meeting {e.get('summary')} {e['start'].get('dateTime')}-{e['end'].get('dateTime')} "
             f"{[a['email'] for a in e.get('attendees', [])]}" for e in events]
    for m in sent[:40]:
        to = next(h["value"] for h in gmail.messages().get(userId="me", id=m["id"], format="metadata", metadataHeaders=["To"]).execute()["payload"]["headers"])
        lines.append(f"Email to {to}")
    sheet = ai.generate(f"Clients by domain: {CLIENTS}. Emails count 10 min each. Build a timesheet grouped by client:\n" + "\n".join(lines),
                        max_output_tokens=700).text
    notify.email_me(f"Timesheet {start:%d %b}", sheet)
    return {"events": len(events), "emails": len(sent)}