async function sendMessage(message, messageList, userName, token) {
  if (!token) { 
    return "not_init";
  }
  messageList.push({ role: "user", content: message });
  const cuerpo = { messages: messageList, user: userName }
  const response = await fetch("/api/chat/completions", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": `Bearer ${token}`
    },
    body: JSON.stringify(cuerpo)
  });
  if (!response.ok) {
    const errorData = await response.json().catch(() => ({ message: "Respuesta no válida del servidor." }));
    throw new Error(errorData.message || `Error del servidor: ${response.status}`);
  }
  const data = await response.json();
  const assistantResponse = data.response;
  if (assistantResponse) {
    messageList.push({ role: "assistant", content: assistantResponse });
    return { messageList, assistantResponse };
  } else {
    throw new Error("Respuesta vacía del asistente.");
  }
}

export { sendMessage };