function _typeof(obj) {
  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    _typeof = function _typeof(obj) {
      return typeof obj;
    };
  } else {
    _typeof = function _typeof(obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof(obj);
}

function _toConsumableArray(arr) {
  return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
}

function _nonIterableSpread() {
  throw new TypeError("Invalid attempt to spread non-iterable instance");
}

function _iterableToArray(iter) {
  if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
}

function _arrayWithoutHoles(arr) {
  if (Array.isArray(arr)) {
    for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) {
      arr2[i] = arr[i];
    }

    return arr2;
  }
}

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof(call) === "object" || typeof call === "function")) {
    return call;
  }

  return _assertThisInitialized(self);
}

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

function _getPrototypeOf(o) {
  _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

function _inherits(subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function");
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      writable: true,
      configurable: true
    }
  });
  if (superClass) _setPrototypeOf(subClass, superClass);
}

function _setPrototypeOf(o, p) {
  _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}
/**
 * Copyright IBM Corp. 2016, 2018
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */


import NavigationMenuPanel from './navigation-menu-panel';
import on from '../../globals/js/misc/on';
import eventMatches from '../../globals/js/misc/event-matches';
import settings from '../../globals/js/settings';

var NavigationMenu =
/*#__PURE__*/
function (_NavigationMenuPanel) {
  _inherits(NavigationMenu, _NavigationMenuPanel);
  /**
   * A navigation menu
   * @extends NavigationMenuPanel
   * @param {HTMLElement} element The element working as a selector.
   * @param {object} [options] The component options.
   * @param {string} [options.selectorInit] The CSS class to find navigation
   * menus.
   * @param {string} [options.attribInitTarget] The attribute name in the
   * launcher buttons to find target navigation menu.
   * @param {string} [options.selectorShellNavSubmenu] The CSS selector for a
   * nav submenu
   * @param {string} [options.selectorShellNavLink] The CSS selector for a nav
   * link
   * @param {string} [options.selectorShellNavLinkCurrent] The CSS selector for
   * the current nav link
   * @param {string} [options.selectorShellNavItem] The CSS selector for a nav
   * item
   * @param {string} [options.selectorShellNavCategory] The CSS selector for a
   * nav category
   * @param {string} [options.classShellNavItemActive] The CSS class for the
   * active nav item
   * @param {string} [options.classShellNavLinkCurrent] The CSS class for the
   * current lav link
   * @param {string} [options.classShellNavCategoryExpanded] The CSS class
   * for an expanded nav category
   */


  function NavigationMenu(element, options) {
    var _this;

    _classCallCheck(this, NavigationMenu);

    _this = _possibleConstructorReturn(this, _getPrototypeOf(NavigationMenu).call(this, element, options));

    _this.getCurrentNavigation = function () {
      return _this.element.ownerDocument.activeElement;
    };

    _this.navigate = function (direction) {
      var items = _toConsumableArray(_this.element.querySelectorAll(_this.options.selectorFocusableNavItems));

      var start = _this.getCurrentNavigation();

      var getNextItem = function getNextItem(old) {
        var handleUnderflow = function handleUnderflow(index, length) {
          return index + (index >= 0 ? 0 : length);
        };

        var handleOverflow = function handleOverflow(index, length) {
          return index - (index < length ? 0 : length);
        }; // `items.indexOf(old)` may be -1 (Scenario of no previous focus)


        var index = Math.max(items.indexOf(old) + direction, -1);
        return items[handleUnderflow(handleOverflow(index, items.length), items.length)];
      };

      getNextItem(start).focus();
    };

    _this._handleKeyDown = function (event) {
      // handle Esc
      var isExpanded = !_this.element.hasAttribute('hidden');

      if (event.which === 27 && isExpanded) {
        _this.changeState('collapsed');

        if (_this.triggerButton) {
          _this.triggerButton.focus();
        }

        return;
      } // handle up/down arrow keys


      var matchesNavSubmenu = eventMatches(event, _this.options.selectorShellNavSubmenu);
      var matchesShellNavLink = eventMatches(event, _this.options.selectorShellNavLink);

      if (!matchesNavSubmenu && !matchesShellNavLink) {
        return;
      }

      var navigationKeyCodes = {
        38: _this.constructor.NAVIGATE.BACKWARD,
        // up arrow
        40: _this.constructor.NAVIGATE.FORWARD // down arrow

      };
      var navigationKeyCodeMatches = navigationKeyCodes[event.which];

      if (navigationKeyCodeMatches) {
        event.preventDefault(); // prevent arrow keys from scrolling

        _this.navigate(navigationKeyCodeMatches);
      }
    };

    _this._handleFocusOut = function (event) {
      var nextTargetIsOfSelf = _this.element.contains(event.relatedTarget) || event.relatedTarget === _this.triggerButton || !event.relatedTarget;

      var oldTargetIsOfSelf = _this.element.contains(event.target);

      if (oldTargetIsOfSelf && !nextTargetIsOfSelf) {
        _this.changeState('collapsed');

        _this.triggerButton.focus();
      }
    };

    _this.changeNavSubmenuState = function (_ref) {
      var matchesNavSubmenu = _ref.matchesNavSubmenu,
          shouldBeCollapsed = _ref.shouldBeCollapsed;
      var shellNavCategory = matchesNavSubmenu.closest(_this.options.selectorShellNavCategory);

      if (!shellNavCategory) {
        return;
      }

      matchesNavSubmenu.setAttribute('aria-expanded', !shouldBeCollapsed);
      shellNavCategory.classList.toggle(_this.options.classShellNavCategoryExpanded);
      Array.prototype.forEach.call(shellNavCategory.querySelectorAll(_this.options.selectorShellNavLink), function (item) {
        item.tabIndex = !shouldBeCollapsed ? 0 : -1;
      });
    };

    _this._handleClick = function (event) {
      var matchesNavSubmenu = eventMatches(event, _this.options.selectorShellNavSubmenu);
      var matchesShellNavLink = eventMatches(event, _this.options.selectorShellNavLink);
      var matchesNestedShellNavLink = eventMatches(event, _this.options.selectorShellNestedNavLink);

      if (!matchesNavSubmenu && !matchesShellNavLink) {
        return;
      }

      if (matchesNestedShellNavLink) {
        _toConsumableArray(_this.element.querySelectorAll(_this.options.selectorShellNavLinkCurrent)).forEach(function (el) {
          el.classList.remove(_this.options.classShellNavItemActive, _this.options.classShellNavLinkCurrent);
        });

        matchesNestedShellNavLink.closest(_this.options.selectorShellNavNestedCategory).classList.add(_this.options.classShellNavItemActive);
        return;
      }

      if (matchesNavSubmenu) {
        var isExpanded = matchesNavSubmenu.getAttribute('aria-expanded') === 'true';

        _this.changeNavSubmenuState({
          matchesNavSubmenu: matchesNavSubmenu,
          isExpanded: isExpanded
        });

        return;
      }

      if (matchesShellNavLink) {
        _toConsumableArray(_this.element.querySelectorAll(_this.options.selectorShellNavLinkCurrent)).forEach(function (el) {
          el.classList.remove(_this.options.classShellNavItemActive, _this.options.classShellNavLinkCurrent);
        });

        matchesShellNavLink.closest(_this.options.selectorShellNavItem).classList.add(_this.options.classShellNavItemActive);
      }
    };

    _this.manage(on(element, 'click', _this._handleClick));

    _this.manage(on(element, 'keydown', _this._handleKeyDown));

    _this.manage(on(_this.element.ownerDocument, 'click', function (event) {
      if (!_this.element.hasAttribute('hidden') && !_this.triggerButton.contains(event.target) && !_this.element.contains(event.target)) {
        _this.changeState('collapsed');
      }
    }));

    var hasFocusOut = 'onfocusout' in window;

    _this.manage(on(_this.element, hasFocusOut ? 'focusout' : 'blur', _this._handleFocusOut, !hasFocusOut));

    return _this;
  }
  /**
   * @returns {Element} Currently highlighted element.
   */


  _createClass(NavigationMenu, null, [{
    key: "options",

    /**
     * The component options.
     * If `options` is specified in the constructor,
     * {@linkcode NavigationMenu.create .create()}, or
     * {@linkcode NavigationMenu.init .init()},
     * properties in this object are overriden for the instance being create and
     * how {@linkcode NavigationMenu.init .init()} works.
     * @member NavigationMenu.options
     * @type {object}
     * @property {string} selectorInit The CSS class to find navigation menus.
     * @property {string} attribInitTarget The attribute name in the
     * launcher buttons to find target navigation menu.
     * @property {string[]} initEventNames The events that the component
     * will handles
     */
    get: function get() {
      var prefix = settings.prefix;
      return Object.assign(Object.create(NavigationMenuPanel.options), {
        selectorInit: '[data-navigation-menu]',
        attribInitTarget: 'data-navigation-menu-target',
        selectorShellNavSubmenu: ".".concat(prefix, "--navigation__category-toggle"),
        selectorShellNavLink: ".".concat(prefix, "--navigation-link"),
        selectorShellNestedNavLink: ".".concat(prefix, "--navigation__category-item > a.").concat(prefix, "--navigation-link"),
        selectorShellNavLinkCurrent: ".".concat(prefix, "--navigation-item--active,.").concat(prefix, "--navigation__category-item--active"),
        selectorFocusableNavItems: "\n        .".concat(prefix, "--navigation__category-toggle,\n        .").concat(prefix, "--navigation-item > .").concat(prefix, "--navigation-link,\n        .").concat(prefix, "--navigation-link[tabindex=\"0\"]\n      "),
        selectorShellNavItem: ".".concat(prefix, "--navigation-item"),
        selectorShellNavCategory: ".".concat(prefix, "--navigation__category"),
        selectorShellNavNestedCategory: ".".concat(prefix, "--navigation__category-item"),
        classShellNavItemActive: "".concat(prefix, "--navigation-item--active"),
        classShellNavLinkCurrent: "".concat(prefix, "--navigation__category-item--active"),
        classShellNavCategoryExpanded: "".concat(prefix, "--navigation__category--expanded")
      });
    }
    /**
     * Enum for navigating backward/forward.
     * @readonly
     * @member NavigationMenuPanel.NAVIGATE
     * @type {object}
     * @property {number} BACKWARD Navigating backward.
     * @property {number} FORWARD Navigating forward.
     */

  }]);

  NavigationMenu.components = new WeakMap();
  NavigationMenu.NAVIGATE = {
    BACKWARD: -1,
    FORWARD: 1
  };
  return NavigationMenu;
}(NavigationMenuPanel);

export { NavigationMenu as default };