Answer WhatsApp customers with AI that remembers the chat

from clickruntime import on_event, credentials, http, state, ai, notify

PHONE_NUMBER_ID = "123456789012345"
BUSINESS = "Northwind Bakery. Open 8–18 Mon–Sat. Orders by 4pm for next-day pickup."

@on_event
def handle(event):
    value = event.json["entry"][0]["changes"][0]["value"]
    if "messages" not in value:
        return {"skipped": "status update"}
    msg = value["messages"][0]
    sender, text = msg["from"], msg.get("text", {}).get("body", "")
    history = state.get(f"chat:{sender}") or []
    history.append(f"Customer: {text}")
    out = ai.generate("\n".join(history[-20:]), system=f"You reply to WhatsApp customers for {BUSINESS} Be brief. Set human=true if they ask for a person or you can't help.",
                      json_schema={"type": "object", "properties": {"reply": {"type": "string"}, "human": {"type": "boolean"}}}, max_output_tokens=250).json
    http.post(f"https://graph.facebook.com/v21.0/{PHONE_NUMBER_ID}/messages",
              headers={"Authorization": f"Bearer {credentials.secret('WHATSAPP_TOKEN')}"},
              json={"messaging_product": "whatsapp", "to": sender, "type": "text", "text": {"body": out["reply"]}})
    history.append(f"Us: {out['reply']}")
    state.set(f"chat:{sender}", history[-20:])
    if out["human"]:
        notify.email_me(f"WhatsApp: +{sender} wants a person", "\n".join(history[-6:]))
    return {"replied": True, "escalated": out["human"]}