Get a meeting prep brief on WhatsApp each morning

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

MY_DOMAIN = "example.com"
MY_PHONE = "447700900123"
WA = "https://graph.facebook.com/v20.0/your-phone-number-id/messages"

def wa(to, text):
    http.post(WA, headers={"Authorization": f"Bearer {credentials.secret('WHATSAPP_TOKEN')}"},
              json={"messaging_product": "whatsapp", "to": to, "type": "text", "text": {"body": text}}).raise_for_status()

@on_trigger
def run(event):
    creds = Credentials(credentials.connection("google", "work"))
    cal, gmail = build("calendar", "v3", credentials=creds, cache_discovery=False), build("gmail", "v1", credentials=creds, cache_discovery=False)
    start = datetime.now(timezone.utc).replace(hour=0, minute=0)
    events = cal.events().list(calendarId="primary", timeMin=start.isoformat(), timeMax=(start + timedelta(days=1)).isoformat(),
                               singleEvents=True).execute().get("items", [])
    briefs = []
    for e in events:
        guests = [a["email"] for a in e.get("attendees", []) if not a["email"].endswith(MY_DOMAIN)]
        if not guests: continue
        q = " OR ".join(f"from:{g} OR to:{g}" for g in guests) + " newer_than:30d"
        snippets = [gmail.users().messages().get(userId="me", id=m["id"], format="metadata").execute()["snippet"]
                    for m in gmail.users().messages().list(userId="me", q=q, maxResults=5).execute().get("messages", [])]
        brief = ai.generate("\n".join(snippets) or "No recent emails.", max_output_tokens=150,
                            system=f"Write a 3-line prep brief for a meeting with {', '.join(guests)}: last topics, open items.").text
        briefs.append(f"📅 {e.get('summary', 'Meeting')}\n{brief.strip()}")
    if briefs: wa(MY_PHONE, "\n\n".join(briefs)[:4000])
    return {"briefs": len(briefs)}