‘use strict’;

!function($) {

/**

* Drilldown module.
* @module foundation.drilldown
* @requires foundation.util.keyboard
* @requires foundation.util.motion
* @requires foundation.util.nest
*/

class Drilldown {

/**
 * Creates a new instance of a drilldown menu.
 * @class
 * @param {jQuery} element - jQuery object to make into an accordion menu.
 * @param {Object} options - Overrides to the default plugin settings.
 */
constructor(element, options) {
  this.$element = element;
  this.options = $.extend({}, Drilldown.defaults, this.$element.data(), options);

  Foundation.Nest.Feather(this.$element, 'drilldown');

  this._init();

  Foundation.registerPlugin(this, 'Drilldown');
  Foundation.Keyboard.register('Drilldown', {
    'ENTER': 'open',
    'SPACE': 'open',
    'ARROW_RIGHT': 'next',
    'ARROW_UP': 'up',
    'ARROW_DOWN': 'down',
    'ARROW_LEFT': 'previous',
    'ESCAPE': 'close',
    'TAB': 'down',
    'SHIFT_TAB': 'up'
  });
}

/**
 * Initializes the drilldown by creating jQuery collections of elements
 * @private
 */
_init() {
  this.$submenuAnchors = this.$element.find('li.is-drilldown-submenu-parent').children('a');
  this.$submenus = this.$submenuAnchors.parent('li').children('[data-submenu]');
  this.$menuItems = this.$element.find('li').not('.js-drilldown-back').attr('role', 'menuitem').find('a');
  this.$element.attr('data-mutate', (this.$element.attr('data-drilldown') || Foundation.GetYoDigits(6, 'drilldown')));

  this._prepareMenu();
  this._registerEvents();

  this._keyboardEvents();
}

/**
 * prepares drilldown menu by setting attributes to links and elements
 * sets a min height to prevent content jumping
 * wraps the element if not already wrapped
 * @private
 * @function
 */
_prepareMenu() {
  var _this = this;
  // if(!this.options.holdOpen){
  //   this._menuLinkEvents();
  // }
  this.$submenuAnchors.each(function(){
    var $link = $(this);
    var $sub = $link.parent();
    if(_this.options.parentLink){
      $link.clone().prependTo($sub.children('[data-submenu]')).wrap('<li class="is-submenu-parent-item is-submenu-item is-drilldown-submenu-item" role="menu-item"></li>');
    }
    $link.data('savedHref', $link.attr('href')).removeAttr('href').attr('tabindex', 0);
    $link.children('[data-submenu]')
        .attr({
          'aria-hidden': true,
          'tabindex': 0,
          'role': 'menu'
        });
    _this._events($link);
  });
  this.$submenus.each(function(){
    var $menu = $(this),
        $back = $menu.find('.js-drilldown-back');
    if(!$back.length){
      switch (_this.options.backButtonPosition) {
        case "bottom":
          $menu.append(_this.options.backButton);
          break;
        case "top":
          $menu.prepend(_this.options.backButton);
          break;
        default:
          console.error("Unsupported backButtonPosition value '" + _this.options.backButtonPosition + "'");
      }
    }
    _this._back($menu);
  });

  this.$submenus.addClass('invisible');
  if(!this.options.autoHeight) {
    this.$submenus.addClass('drilldown-submenu-cover-previous');
  }

  // create a wrapper on element if it doesn't exist.
  if(!this.$element.parent().hasClass('is-drilldown')){
    this.$wrapper = $(this.options.wrapper).addClass('is-drilldown');
    if(this.options.animateHeight) this.$wrapper.addClass('animate-height');
    this.$element.wrap(this.$wrapper);
  }
  // set wrapper
  this.$wrapper = this.$element.parent();
  this.$wrapper.css(this._getMaxDims());
}

_resize() {
  this.$wrapper.css({'max-width': 'none', 'min-height': 'none'});
  // _getMaxDims has side effects (boo) but calling it should update all other necessary heights & widths
  this.$wrapper.css(this._getMaxDims());
}

/**
 * Adds event handlers to elements in the menu.
 * @function
 * @private
 * @param {jQuery} $elem - the current menu item to add handlers to.
 */
_events($elem) {
  var _this = this;

  $elem.off('click.zf.drilldown')
  .on('click.zf.drilldown', function(e){
    if($(e.target).parentsUntil('ul', 'li').hasClass('is-drilldown-submenu-parent')){
      e.stopImmediatePropagation();
      e.preventDefault();
    }

    // if(e.target !== e.currentTarget.firstElementChild){
    //   return false;
    // }
    _this._show($elem.parent('li'));

    if(_this.options.closeOnClick){
      var $body = $('body');
      $body.off('.zf.drilldown').on('click.zf.drilldown', function(e){
        if (e.target === _this.$element[0] || $.contains(_this.$element[0], e.target)) { return; }
        e.preventDefault();
        _this._hideAll();
        $body.off('.zf.drilldown');
      });
    }
  });
        this.$element.on('mutateme.zf.trigger', this._resize.bind(this));
}

/**
 * Adds event handlers to the menu element.
 * @function
 * @private
 */
_registerEvents() {
  if(this.options.scrollTop){
    this._bindHandler = this._scrollTop.bind(this);
    this.$element.on('open.zf.drilldown hide.zf.drilldown closed.zf.drilldown',this._bindHandler);
  }
}

/**
 * Scroll to Top of Element or data-scroll-top-element
 * @function
 * @fires Drilldown#scrollme
 */
_scrollTop() {
  var _this = this;
  var $scrollTopElement = _this.options.scrollTopElement!=''?$(_this.options.scrollTopElement):_this.$element,
      scrollPos = parseInt($scrollTopElement.offset().top+_this.options.scrollTopOffset);
  $('html, body').stop(true).animate({ scrollTop: scrollPos }, _this.options.animationDuration, _this.options.animationEasing,function(){
    /**
      * Fires after the menu has scrolled
      * @event Drilldown#scrollme
      */
    if(this===$('html')[0])_this.$element.trigger('scrollme.zf.drilldown');
  });
}

/**
 * Adds keydown event listener to `li`'s in the menu.
 * @private
 */
_keyboardEvents() {
  var _this = this;

  this.$menuItems.add(this.$element.find('.js-drilldown-back > a, .is-submenu-parent-item > a')).on('keydown.zf.drilldown', function(e){
    var $element = $(this),
        $elements = $element.parent('li').parent('ul').children('li').children('a'),
        $prevElement,
        $nextElement;

    $elements.each(function(i) {
      if ($(this).is($element)) {
        $prevElement = $elements.eq(Math.max(0, i-1));
        $nextElement = $elements.eq(Math.min(i+1, $elements.length-1));
        return;
      }
    });

    Foundation.Keyboard.handleKey(e, 'Drilldown', {
      next: function() {
        if ($element.is(_this.$submenuAnchors)) {
          _this._show($element.parent('li'));
          $element.parent('li').one(Foundation.transitionend($element), function(){
            $element.parent('li').find('ul li a').filter(_this.$menuItems).first().focus();
          });
          return true;
        }
      },
      previous: function() {
        _this._hide($element.parent('li').parent('ul'));
        $element.parent('li').parent('ul').one(Foundation.transitionend($element), function(){
          setTimeout(function() {
            $element.parent('li').parent('ul').parent('li').children('a').first().focus();
          }, 1);
        });
        return true;
      },
      up: function() {
        $prevElement.focus();
        // Don't tap focus on first element in root ul
        return !$element.is(_this.$element.find('> li:first-child > a'));
      },
      down: function() {
        $nextElement.focus();
        // Don't tap focus on last element in root ul
        return !$element.is(_this.$element.find('> li:last-child > a'));
      },
      close: function() {
        // Don't close on element in root ul
        if (!$element.is(_this.$element.find('> li > a'))) {
          _this._hide($element.parent().parent());
          $element.parent().parent().siblings('a').focus();
        }
      },
      open: function() {
        if (!$element.is(_this.$menuItems)) { // not menu item means back button
          _this._hide($element.parent('li').parent('ul'));
          $element.parent('li').parent('ul').one(Foundation.transitionend($element), function(){
            setTimeout(function() {
              $element.parent('li').parent('ul').parent('li').children('a').first().focus();
            }, 1);
          });
          return true;
        } else if ($element.is(_this.$submenuAnchors)) {
          _this._show($element.parent('li'));
          $element.parent('li').one(Foundation.transitionend($element), function(){
            $element.parent('li').find('ul li a').filter(_this.$menuItems).first().focus();
          });
          return true;
        }
      },
      handled: function(preventDefault) {
        if (preventDefault) {
          e.preventDefault();
        }
        e.stopImmediatePropagation();
      }
    });
  }); // end keyboardAccess
}

/**
 * Closes all open elements, and returns to root menu.
 * @function
 * @fires Drilldown#closed
 */
_hideAll() {
  var $elem = this.$element.find('.is-drilldown-submenu.is-active').addClass('is-closing');
  if(this.options.autoHeight) this.$wrapper.css({height:$elem.parent().closest('ul').data('calcHeight')});
  $elem.one(Foundation.transitionend($elem), function(e){
    $elem.removeClass('is-active is-closing');
  });
      /**
       * Fires when the menu is fully closed.
       * @event Drilldown#closed
       */
  this.$element.trigger('closed.zf.drilldown');
}

/**
 * Adds event listener for each `back` button, and closes open menus.
 * @function
 * @fires Drilldown#back
 * @param {jQuery} $elem - the current sub-menu to add `back` event.
 */
_back($elem) {
  var _this = this;
  $elem.off('click.zf.drilldown');
  $elem.children('.js-drilldown-back')
    .on('click.zf.drilldown', function(e){
      e.stopImmediatePropagation();
      // console.log('mouseup on back');
      _this._hide($elem);

      // If there is a parent submenu, call show
      let parentSubMenu = $elem.parent('li').parent('ul').parent('li');
      if (parentSubMenu.length) {
        _this._show(parentSubMenu);
      }
    });
}

/**
 * Adds event listener to menu items w/o submenus to close open menus on click.
 * @function
 * @private
 */
_menuLinkEvents() {
  var _this = this;
  this.$menuItems.not('.is-drilldown-submenu-parent')
      .off('click.zf.drilldown')
      .on('click.zf.drilldown', function(e){
        // e.stopImmediatePropagation();
        setTimeout(function(){
          _this._hideAll();
        }, 0);
    });
}

/**
 * Opens a submenu.
 * @function
 * @fires Drilldown#open
 * @param {jQuery} $elem - the current element with a submenu to open, i.e. the `li` tag.
 */
_show($elem) {
  if(this.options.autoHeight) this.$wrapper.css({height:$elem.children('[data-submenu]').data('calcHeight')});
  $elem.attr('aria-expanded', true);
  $elem.children('[data-submenu]').addClass('is-active').removeClass('invisible').attr('aria-hidden', false);
  /**
   * Fires when the submenu has opened.
   * @event Drilldown#open
   */
  this.$element.trigger('open.zf.drilldown', [$elem]);
};

/**
 * Hides a submenu
 * @function
 * @fires Drilldown#hide
 * @param {jQuery} $elem - the current sub-menu to hide, i.e. the `ul` tag.
 */
_hide($elem) {
  if(this.options.autoHeight) this.$wrapper.css({height:$elem.parent().closest('ul').data('calcHeight')});
  var _this = this;
  $elem.parent('li').attr('aria-expanded', false);
  $elem.attr('aria-hidden', true).addClass('is-closing')
  $elem.addClass('is-closing')
       .one(Foundation.transitionend($elem), function(){
         $elem.removeClass('is-active is-closing');
         $elem.blur().addClass('invisible');
       });
  /**
   * Fires when the submenu has closed.
   * @event Drilldown#hide
   */
  $elem.trigger('hide.zf.drilldown', [$elem]);
}

/**
 * Iterates through the nested menus to calculate the min-height, and max-width for the menu.
 * Prevents content jumping.
 * @function
 * @private
 */
_getMaxDims() {
  var  maxHeight = 0, result = {}, _this = this;
  this.$submenus.add(this.$element).each(function(){
    var numOfElems = $(this).children('li').length;
    var height = Foundation.Box.GetDimensions(this).height;
    maxHeight = height > maxHeight ? height : maxHeight;
    if(_this.options.autoHeight) {
      $(this).data('calcHeight',height);
      if (!$(this).hasClass('is-drilldown-submenu')) result['height'] = height;
    }
  });

  if(!this.options.autoHeight) result['min-height'] = `${maxHeight}px`;

  result['max-width'] = `${this.$element[0].getBoundingClientRect().width}px`;

  return result;
}

/**
 * Destroys the Drilldown Menu
 * @function
 */
destroy() {
  if(this.options.scrollTop) this.$element.off('.zf.drilldown',this._bindHandler);
  this._hideAll();
        this.$element.off('mutateme.zf.trigger');
  Foundation.Nest.Burn(this.$element, 'drilldown');
  this.$element.unwrap()
               .find('.js-drilldown-back, .is-submenu-parent-item').remove()
               .end().find('.is-active, .is-closing, .is-drilldown-submenu').removeClass('is-active is-closing is-drilldown-submenu')
               .end().find('[data-submenu]').removeAttr('aria-hidden tabindex role');
  this.$submenuAnchors.each(function() {
    $(this).off('.zf.drilldown');
  });

  this.$submenus.removeClass('drilldown-submenu-cover-previous');

  this.$element.find('a').each(function(){
    var $link = $(this);
    $link.removeAttr('tabindex');
    if($link.data('savedHref')){
      $link.attr('href', $link.data('savedHref')).removeData('savedHref');
    }else{ return; }
  });
  Foundation.unregisterPlugin(this);
};

}

Drilldown.defaults = {

/**
 * Markup used for JS generated back button. Prepended  or appended (see backButtonPosition) to submenu lists and deleted on `destroy` method, 'js-drilldown-back' class required. Remove the backslash (`\`) if copy and pasting.
 * @option
 * @type {string}
 * @default '<li class="js-drilldown-back"><a tabindex="0">Back</a></li>'
 */
backButton: '<li class="js-drilldown-back"><a tabindex="0">Back</a></li>',
/**
 * Position the back button either at the top or bottom of drilldown submenus. Can be `'left'` or `'bottom'`.
 * @option
 * @type {string}
 * @default top
 */
backButtonPosition: 'top',
/**
 * Markup used to wrap drilldown menu. Use a class name for independent styling; the JS applied class: `is-drilldown` is required. Remove the backslash (`\`) if copy and pasting.
 * @option
 * @type {string}
 * @default '<div></div>'
 */
wrapper: '<div></div>',
/**
 * Adds the parent link to the submenu.
 * @option
 * @type {boolean}
 * @default false
 */
parentLink: false,
/**
 * Allow the menu to return to root list on body click.
 * @option
 * @type {boolean}
 * @default false
 */
closeOnClick: false,
/**
 * Allow the menu to auto adjust height.
 * @option
 * @type {boolean}
 * @default false
 */
autoHeight: false,
/**
 * Animate the auto adjust height.
 * @option
 * @type {boolean}
 * @default false
 */
animateHeight: false,
/**
 * Scroll to the top of the menu after opening a submenu or navigating back using the menu back button
 * @option
 * @type {boolean}
 * @default false
 */
scrollTop: false,
/**
 * String jquery selector (for example 'body') of element to take offset().top from, if empty string the drilldown menu offset().top is taken
 * @option
 * @type {string}
 * @default ''
 */
scrollTopElement: '',
/**
 * ScrollTop offset
 * @option
 * @type {number}
 * @default 0
 */
scrollTopOffset: 0,
/**
 * Scroll animation duration
 * @option
 * @type {number}
 * @default 500
 */
animationDuration: 500,
/**
 * Scroll animation easing. Can be `'swing'` or `'linear'`.
 * @option
 * @type {string}
 * @see {@link https://api.jquery.com/animate|JQuery animate}
 * @default 'swing'
 */
animationEasing: 'swing'
// holdOpen: false

};

// Window exports Foundation.plugin(Drilldown, ‘Drilldown’);

}(jQuery);