import getRole from '../aria/get-role';
import getElementSpec from '../standards/get-element-spec';
import nativeTextMethods from './native-text-methods';

/**
 * Get the accessible text using native HTML methods only
 * @param {VirtualNode} element
 * @param {Object} context
 * @property {Bool} debug Enable logging for formControlValue
 * @return {String} Accessible text
 */
function nativeTextAlternative(virtualNode, context = {}) {
  const { actualNode } = virtualNode;
  if (
    virtualNode.props.nodeType !== 1 ||
    ['presentation', 'none'].includes(getRole(virtualNode))
  ) {
    return '';
  }

  const textMethods = findTextMethods(virtualNode);
  // Find the first step that returns a non-empty string
  const accName = textMethods.reduce((accName, step) => {
    return accName || step(virtualNode, context);
  }, '');

  if (context.debug) {
    axe.log(accName || '{empty-value}', actualNode, context);
  }
  return accName;
}

/**
 * Get accessible text functions for a specific native HTML element
 * @private
 * @param {VirtualNode} element
 * @return {Function[]} Array of native accessible name computation methods
 */
function findTextMethods(virtualNode) {
  const elmSpec = getElementSpec(virtualNode);
  const methods = elmSpec.namingMethods || [];

  return methods.map(methodName => nativeTextMethods[methodName]);
}

export default nativeTextAlternative;