Get a daily email summary on WhatsApp

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

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()
gmail = lambda: build("gmail", "v1", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False).users()

@on_trigger
def run(event):
    ids = gmail().messages().list(userId="me", q="in:inbox newer_than:1d", maxResults=50).execute().get("messages", [])
    if not ids:
        wa(MY_PHONE, "No new emails today.")
        return {"emails": 0}
    lines = []
    for m in ids:
        msg = gmail().messages().get(userId="me", id=m["id"], format="metadata", metadataHeaders=["From", "Subject"]).execute()
        head = {h["name"]: h["value"] for h in msg["payload"]["headers"]}
        lines.append(f"{head.get('From', '')[:60]} | {head.get('Subject', '')[:100]} | {msg['snippet'][:150]}")
    summary = ai.generate("\n".join(lines), max_output_tokens=400,
                          system="Summarise today's emails in up to 10 short lines. List ones needing a reply first, then the rest grouped.").text
    wa(MY_PHONE, f"📬 Today's email ({len(ids)}):\n{summary.strip()}")
    return {"emails": len(ids)}