"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getRoles = getRoles;
exports.getImplicitAriaRoles = getImplicitAriaRoles;
exports.isSubtreeInaccessible = isSubtreeInaccessible;
exports.prettyRoles = prettyRoles;
exports.isInaccessible = isInaccessible;
exports.computeAriaSelected = computeAriaSelected;
exports.computeAriaChecked = computeAriaChecked;
exports.computeAriaPressed = computeAriaPressed;
exports.computeAriaExpanded = computeAriaExpanded;
exports.computeHeadingLevel = computeHeadingLevel;
exports.logRoles = void 0;

var _ariaQuery = require("aria-query");

var _domAccessibilityApi = require("dom-accessibility-api");

var _prettyDom = require("./pretty-dom");

var _config = require("./config");

const elementRoleList = buildElementRoleList(_ariaQuery.elementRoles);
/**
 * @param {Element} element -
 * @returns {boolean} - `true` if `element` and its subtree are inaccessible
 */

function isSubtreeInaccessible(element) {
  if (element.hidden === true) {
    return true;
  }

  if (element.getAttribute('aria-hidden') === 'true') {
    return true;
  }

  const window = element.ownerDocument.defaultView;

  if (window.getComputedStyle(element).display === 'none') {
    return true;
  }

  return false;
}
/**
 * Partial implementation https://www.w3.org/TR/wai-aria-1.2/#tree_exclusion
 * which should only be used for elements with a non-presentational role i.e.
 * `role="none"` and `role="presentation"` will not be excluded.
 *
 * Implements aria-hidden semantics (i.e. parent overrides child)
 * Ignores "Child Presentational: True" characteristics
 *
 * @param {Element} element -
 * @param {object} [options] -
 * @param {function (element: Element): boolean} options.isSubtreeInaccessible -
 * can be used to return cached results from previous isSubtreeInaccessible calls
 * @returns {boolean} true if excluded, otherwise false
 */


function isInaccessible(element, options = {}) {
  const {
    isSubtreeInaccessible: isSubtreeInaccessibleImpl = isSubtreeInaccessible
  } = options;
  const window = element.ownerDocument.defaultView; // since visibility is inherited we can exit early

  if (window.getComputedStyle(element).visibility === 'hidden') {
    return true;
  }

  let currentElement = element;

  while (currentElement) {
    if (isSubtreeInaccessibleImpl(currentElement)) {
      return true;
    }

    currentElement = currentElement.parentElement;
  }

  return false;
}

function getImplicitAriaRoles(currentNode) {
  // eslint bug here:
  // eslint-disable-next-line no-unused-vars
  for (const {
    match,
    roles
  } of elementRoleList) {
    if (match(currentNode)) {
      return [...roles];
    }
  }

  return [];
}

function buildElementRoleList(elementRolesMap) {
  function makeElementSelector({
    name,
    attributes
  }) {
    return `${name}${attributes.map(({
      name: attributeName,
      value,
      constraints = []
    }) => {
      const shouldNotExist = constraints.indexOf('undefined') !== -1;

      if (shouldNotExist) {
        return `:not([${attributeName}])`;
      } else if (value) {
        return `[${attributeName}="${value}"]`;
      } else {
        return `[${attributeName}]`;
      }
    }).join('')}`;
  }

  function getSelectorSpecificity({
    attributes = []
  }) {
    return attributes.length;
  }

  function match(element) {
    return node => {
      let {
        attributes = []
      } = element; // https://github.com/testing-library/dom-testing-library/issues/814

      const typeTextIndex = attributes.findIndex(attribute => attribute.value && attribute.name === 'type' && attribute.value === 'text');

      if (typeTextIndex >= 0) {
        // not using splice to not mutate the attributes array
        attributes = [...attributes.slice(0, typeTextIndex), ...attributes.slice(typeTextIndex + 1)];

        if (node.type !== 'text') {
          return false;
        }
      }

      return node.matches(makeElementSelector({ ...element,
        attributes
      }));
    };
  }

  let result = []; // eslint bug here:
  // eslint-disable-next-line no-unused-vars

  for (const [element, roles] of elementRolesMap.entries()) {
    result = [...result, {
      match: match(element),
      roles: Array.from(roles),
      specificity: getSelectorSpecificity(element)
    }];
  }

  return result.sort(function ({
    specificity: leftSpecificity
  }, {
    specificity: rightSpecificity
  }) {
    return rightSpecificity - leftSpecificity;
  });
}

function getRoles(container, {
  hidden = false
} = {}) {
  function flattenDOM(node) {
    return [node, ...Array.from(node.children).reduce((acc, child) => [...acc, ...flattenDOM(child)], [])];
  }

  return flattenDOM(container).filter(element => {
    return hidden === false ? isInaccessible(element) === false : true;
  }).reduce((acc, node) => {
    let roles = []; // TODO: This violates html-aria which does not allow any role on every element

    if (node.hasAttribute('role')) {
      roles = node.getAttribute('role').split(' ').slice(0, 1);
    } else {
      roles = getImplicitAriaRoles(node);
    }

    return roles.reduce((rolesAcc, role) => Array.isArray(rolesAcc[role]) ? { ...rolesAcc,
      [role]: [...rolesAcc[role], node]
    } : { ...rolesAcc,
      [role]: [node]
    }, acc);
  }, {});
}

function prettyRoles(dom, {
  hidden
}) {
  const roles = getRoles(dom, {
    hidden
  }); // We prefer to skip generic role, we don't recommend it

  return Object.entries(roles).filter(([role]) => role !== 'generic').map(([role, elements]) => {
    const delimiterBar = '-'.repeat(50);
    const elementsString = elements.map(el => {
      const nameString = `Name "${(0, _domAccessibilityApi.computeAccessibleName)(el, {
        computedStyleSupportsPseudoElements: (0, _config.getConfig)().computedStyleSupportsPseudoElements
      })}":\n`;
      const domString = (0, _prettyDom.prettyDOM)(el.cloneNode(false));
      return `${nameString}${domString}`;
    }).join('\n\n');
    return `${role}:\n\n${elementsString}\n\n${delimiterBar}`;
  }).join('\n');
}

const logRoles = (dom, {
  hidden = false
} = {}) => console.log(prettyRoles(dom, {
  hidden
}));
/**
 * @param {Element} element -
 * @returns {boolean | undefined} - false/true if (not)selected, undefined if not selectable
 */


exports.logRoles = logRoles;

function computeAriaSelected(element) {
  // implicit value from html-aam mappings: https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
  // https://www.w3.org/TR/html-aam-1.0/#details-id-97
  if (element.tagName === 'OPTION') {
    return element.selected;
  } // explicit value


  return checkBooleanAttribute(element, 'aria-selected');
}
/**
 * @param {Element} element -
 * @returns {boolean | undefined} - false/true if (not)checked, undefined if not checked-able
 */


function computeAriaChecked(element) {
  // implicit value from html-aam mappings: https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
  // https://www.w3.org/TR/html-aam-1.0/#details-id-56
  // https://www.w3.org/TR/html-aam-1.0/#details-id-67
  if ('indeterminate' in element && element.indeterminate) {
    return undefined;
  }

  if ('checked' in element) {
    return element.checked;
  } // explicit value


  return checkBooleanAttribute(element, 'aria-checked');
}
/**
 * @param {Element} element -
 * @returns {boolean | undefined} - false/true if (not)pressed, undefined if not press-able
 */


function computeAriaPressed(element) {
  // https://www.w3.org/TR/wai-aria-1.1/#aria-pressed
  return checkBooleanAttribute(element, 'aria-pressed');
}
/**
 * @param {Element} element -
 * @returns {boolean | undefined} - false/true if (not)expanded, undefined if not expand-able
 */


function computeAriaExpanded(element) {
  // https://www.w3.org/TR/wai-aria-1.1/#aria-expanded
  return checkBooleanAttribute(element, 'aria-expanded');
}

function checkBooleanAttribute(element, attribute) {
  const attributeValue = element.getAttribute(attribute);

  if (attributeValue === 'true') {
    return true;
  }

  if (attributeValue === 'false') {
    return false;
  }

  return undefined;
}
/**
 * @param {Element} element -
 * @returns {number | undefined} - number if implicit heading or aria-level present, otherwise undefined
 */


function computeHeadingLevel(element) {
  // https://w3c.github.io/html-aam/#el-h1-h6
  // https://w3c.github.io/html-aam/#el-h1-h6
  // explicit aria-level value
  // https://www.w3.org/TR/wai-aria-1.2/#aria-level
  const ariaLevelAttribute = element.getAttribute('aria-level') && Number(element.getAttribute('aria-level'));
  return ariaLevelAttribute || {
    H1: 1,
    H2: 2,
    H3: 3,
    H4: 4,
    H5: 5,
    H6: 6
  }[element.tagName];
}