Answer customers on WhatsApp and email you what the bot can't

from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
import base64
from clickruntime import on_event, credentials, http, ai

FAQ = "Open 9-5 Mon-Fri. UK delivery 2-3 days, free over £50. Returns within 30 days."
ME_EMAIL = "me@example.com"
SCHEMA = {"type": "object", "properties": {"reply": {"type": "string"}, "escalate": {"type": "boolean"}}, "required": ["reply", "escalate"]}
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()
def incoming(event):
    changes = [c for e in (event.json or {}).get("entry", []) for c in e.get("changes", [])]
    return [(m["from"], m["text"]["body"]) for c in changes for m in c["value"].get("messages", []) if m.get("type") == "text"]
gmail = lambda: build("gmail", "v1", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False).users()

def send_email(to, subject, text):
    raw = base64.urlsafe_b64encode(f"To: {to}\r\nSubject: {subject}\r\n\r\n{text}".encode()).decode()
    gmail().messages().send(userId="me", body={"raw": raw}).execute()

@on_event
def handle(event):
    for phone, text in incoming(event):
        r = ai.generate(text[:1500], json_schema=SCHEMA, max_output_tokens=200,
                        system=f"Answer from these facts only: {FAQ} Set escalate if unsure, a complaint, or they ask for a person.").json
        if r["escalate"]:
            wa(phone, "Thanks, I've passed this to the team and someone will get back to you shortly.")
            send_email(ME_EMAIL, f"WhatsApp question from +{phone}", text)
        else:
            wa(phone, r["reply"])
    return {"ok": True}