const utils = require('./utils.js');

/**
 * Sets the namespace to use for the specified `Document`.
 * @param {Document} xmlDoc The `Document` instance to set the namespace of.
 * @param {string} alias The namespace alias.
 * @param {string} url The namespace URL.
 */
function setNamespace(xmlDoc, alias, url) {
  if (!xmlDoc) throw new Error('A Document must be provided.');
  if (typeof alias !== 'string') throw new Error('alias must be a string.');
  if (typeof url !== 'string') throw new Error('url must be a string.');
  if (!utils.isValidURL(url)) throw new Error('url is not a valid URL.');

  xmlDoc.namespace = {
    alias,
    url,
  };
}

module.exports = setNamespace;