import isVisualContent from './is-visual-content';
import labelVirtual from '../aria/label-virtual';

const hiddenTextElms = [
  'HEAD',
  'TITLE',
  'TEMPLATE',
  'SCRIPT',
  'STYLE',
  'IFRAME',
  'OBJECT',
  'VIDEO',
  'AUDIO',
  'NOSCRIPT'
];

function hasChildTextNodes(elm) {
  if (!hiddenTextElms.includes(elm.actualNode.nodeName.toUpperCase())) {
    return elm.children.some(
      ({ actualNode }) =>
        actualNode.nodeType === 3 && actualNode.nodeValue.trim()
    );
  }
}

/**
 * Check that the element has visible content in the form of either text,
 * an aria-label or visual content such as image
 * @method hasContentVirtual
 * @memberof axe.commons.dom
 * @instance
 * @param	{VirtualNode} elm Virtual Node to search
 * @param	{Boolean} noRecursion If true, only the element is checked, otherwise it will search all child nodes
 * @param {Boolean} ignoreAria if true, ignores `aria label` computation for content deduction
 * @return {Boolean}
 */
function hasContentVirtual(elm, noRecursion, ignoreAria) {
  return (
    // It has text
    hasChildTextNodes(elm) ||
    // It is a graphical element
    isVisualContent(elm.actualNode) ||
    // It has an ARIA label
    (!ignoreAria && !!labelVirtual(elm)) ||
    // or one of it's descendants does
    (!noRecursion &&
      elm.children.some(
        child => child.actualNode.nodeType === 1 && hasContentVirtual(child)
      ))
  );
}

export default hasContentVirtual;