export function parseEvolutionWebhook(reqBody) {
  const envelope = Array.isArray(reqBody) ? reqBody[0] : reqBody;
  const body = envelope?.body ?? envelope ?? {};

  const event = body.event;
  const instance = body.instance; // tenant key
  const data = body.data;

  if (!event || !data || !data.key) {
    return { ok: false, reason: "missing_fields" };
  }

  if (event !== "messages.upsert") {
    return { ok: false, reason: "not_messages_upsert" };
  }

  const remoteJid = data.key.remoteJid;
  const fromMe = data.key.fromMe === true;
  const messageId = data.key.id;

  // only inbound
  if (fromMe) return { ok: false, reason: "from_me" };

  // ignore groups / broadcasts
  if (!remoteJid || typeof remoteJid !== "string") return { ok: false, reason: "no_remoteJid" };
  if (!remoteJid.endsWith("@s.whatsapp.net")) return { ok: false, reason: "not_direct_chat" };

  const messageType = data.messageType;

  // extract text
  const msg = data.message || {};
  const text =
    (typeof msg.conversation === "string" && msg.conversation) ||
    (typeof msg.extendedTextMessage?.text === "string" && msg.extendedTextMessage.text) ||
    "";

  const cleanText = String(text).trim();
  if (!cleanText) return { ok: false, reason: "empty_text" };

  // metadata
  const pushName = data.pushName || null;
  const ts = data.messageTimestamp ? new Date(Number(data.messageTimestamp) * 1000).toISOString() : null;
  const source = data.source || null; // e.g. "sim"

  return {
    ok: true,
    tenant_key: instance || null,
    chat_id: remoteJid,
    message_id: messageId || null,
    text: cleanText,
    from_name: pushName,
    message_type: messageType || null,
    ts,
    source,
    raw: body, // para log/debug si querés
  };
}