Joeven — Learn Autonomous AI Agents

Python loads on first run

USERS = {
    "a": {"invoices": [{"id": 1, "cents": 1999}]},
    "b": {"invoices": [{"id": 2, "cents": 5000}]},
}

def get_invoice(actor, invoice_id):
    if not isinstance(invoice_id, int):
        return {"ok": False, "code": "INVALID_ARGUMENT", "error": "id must be int"}
    for user, blob in USERS.items():
        for inv in blob["invoices"]:
            if inv["id"] == invoice_id:
                if user != actor:
                    return {"ok": False, "code": "PERMISSION_DENIED", "error": "not yours"}
                return {"ok": True, "invoice": inv}
    return {"ok": False, "code": "NOT_FOUND", "error": "no invoice"}

def refund(actor, invoice_id, key, ledger):
    inv = get_invoice(actor, invoice_id)
    if not inv["ok"]:
        return inv
    if key in ledger:
        return {"ok": True, "duplicate": True, "cents": ledger[key]}
    ledger[key] = inv["invoice"]["cents"]
    return {"ok": True, "duplicate": False, "cents": ledger[key]}

ledger = {}
print("own invoice", get_invoice("a", 1)["ok"])
print("cross user", get_invoice("a", 2)["code"])
print("bad id", get_invoice("a", "x")["code"])
r1 = refund("a", 1, "k1", ledger)
r2 = refund("a", 1, "k1", ledger)
print("first dup", r1["duplicate"], "second dup", r2["duplicate"])

Run to execute this in your browser. Nothing is sent to a server.