import { xml } from "@xmpp/client";

export function randomHex () {
  return Math.random().toString(16).slice(2, 8);
}

export function pingXml (to) {
  return xml(
    "iq", { to, id: `ping-${randomHex()}`, type: "get" },
      xml("ping", { xmlns: "urn:xmpp:ping" })
  )
}

export function isPingResponse (stanza) {
  return stanza.attrs.id.match(/^ping/) &&
         stanza.attrs.type === "result";
}

export function roomDirectMessageXml (room, nick, messageBody) {
  return xml(
    "message", { type: "chat", to: `${room}/${nick}` },
      xml("body", {}, messageBody)
  );
}

export function grantVoiceMessageXml (room, nick) {
  return xml(
    "iq", { id: `voice-${randomHex()}`, to: room, type: "set" },
      xml("query", { xmlns: "http://jabber.org/protocol/muc#admin" },
        xml("item", { nick: nick, role: "participant" }
      ))
  );
}

export function parseForm (stanza) {
  const form = stanza.getChild("x", "jabber:x:data");
  if (!form) return false;

  const fieldElements = form.getChildren("field");
  const fields = [];

  for (const e of fieldElements) {
    fields.push({
      name: e.attrs.var,
      value: e.getChild("value").text()
    })
  }

  return fields;
}

export function isVoiceRequest (stanza) {
  const formFields = parseForm(stanza);

  return !!formFields && formFields.find(f => {
    return f.name === "FORM_TYPE" &&
           f.value === "http://jabber.org/protocol/muc#request"
  });
}