/* eslint-disable func-names, no-underscore-dangle, space-before-function-paren, no-var, one-var, one-var-declaration-per-line, prefer-rest-params, max-len, vars-on-top, wrap-iife, no-unused-vars, quotes, no-shadow, no-cond-assign, prefer-arrow-callback, no-return-assign, no-else-return, camelcase, comma-dangle, no-lonely-if, guard-for-in, no-restricted-syntax, consistent-return, prefer-template, no-param-reassign, no-loop-func, no-mixed-operators */
/* global fuzzaldrinPlus */
import _ from 'underscore';
import { isObject } from './lib/utils/type_utility';

var GitLabDropdown, GitLabDropdownFilter, GitLabDropdownRemote, GitLabDropdownInput;

GitLabDropdownInput = (function() {
  function GitLabDropdownInput(input, options) {
    var $inputContainer, $clearButton;
    var _this = this;
    this.input = input;
    this.options = options;
    this.fieldName = this.options.fieldName || 'field-name';
    $inputContainer = this.input.parent();
    $clearButton = $inputContainer.find('.js-dropdown-input-clear');
    $clearButton.on('click', (function(_this) {
      // Clear click
      return function(e) {
        e.preventDefault();
        e.stopPropagation();
        return _this.input.val('').trigger('input').focus();
      };
    })(this));

    this.input
    .on('keydown', function (e) {
      var keyCode = e.which;
      if (keyCode === 13 && !options.elIsInput) {
        e.preventDefault();
      }
    })
    .on('input', function(e) {
      var val = e.currentTarget.value || _this.options.inputFieldName;
      val = val.split(' ').join('-') // replaces space with dash
        .replace(/[^a-zA-Z0-9 -]/g, '').toLowerCase() // replace non alphanumeric
        .replace(/(-)\1+/g, '-'); // replace repeated dashes
      _this.cb(_this.options.fieldName, val, {}, true);
      _this.input.closest('.dropdown')
        .find('.dropdown-toggle-text')
        .text(val);
    });
  }

  GitLabDropdownInput.prototype.onInput = function(cb) {
    this.cb = cb;
  };

  return GitLabDropdownInput;
})();

GitLabDropdownFilter = (function() {
  var ARROW_KEY_CODES, BLUR_KEYCODES, HAS_VALUE_CLASS;

  BLUR_KEYCODES = [27, 40];

  ARROW_KEY_CODES = [38, 40];

  HAS_VALUE_CLASS = "has-value";

  function GitLabDropdownFilter(input, options) {
    var $clearButton, $inputContainer, ref, timeout;
    this.input = input;
    this.options = options;
    this.filterInputBlur = (ref = this.options.filterInputBlur) != null ? ref : true;
    $inputContainer = this.input.parent();
    $clearButton = $inputContainer.find('.js-dropdown-input-clear');
    $clearButton.on('click', (function(_this) {
      // Clear click
      return function(e) {
        e.preventDefault();
        e.stopPropagation();
        return _this.input.val('').trigger('input').focus();
      };
    })(this));
    // Key events
    timeout = "";
    this.input
      .on('keydown', function (e) {
        var keyCode = e.which;
        if (keyCode === 13 && !options.elIsInput) {
          e.preventDefault();
        }
      })
      .on('input', function() {
        if (this.input.val() !== "" && !$inputContainer.hasClass(HAS_VALUE_CLASS)) {
          $inputContainer.addClass(HAS_VALUE_CLASS);
        } else if (this.input.val() === "" && $inputContainer.hasClass(HAS_VALUE_CLASS)) {
          $inputContainer.removeClass(HAS_VALUE_CLASS);
        }
        // Only filter asynchronously only if option remote is set
        if (this.options.remote) {
          clearTimeout(timeout);
          return timeout = setTimeout(function() {
            $inputContainer.parent().addClass('is-loading');

            return this.options.query(this.input.val(), function(data) {
              $inputContainer.parent().removeClass('is-loading');
              return this.options.callback(data);
            }.bind(this));
          }.bind(this), 250);
        } else {
          return this.filter(this.input.val());
        }
      }.bind(this));
  }

  GitLabDropdownFilter.prototype.shouldBlur = function(keyCode) {
    return BLUR_KEYCODES.indexOf(keyCode) !== -1;
  };

  GitLabDropdownFilter.prototype.filter = function(search_text) {
    var data, elements, group, key, results, tmp;
    if (this.options.onFilter) {
      this.options.onFilter(search_text);
    }
    data = this.options.data();
    if ((data != null) && !this.options.filterByText) {
      results = data;
      if (search_text !== '') {
        // When data is an array of objects therefore [object Array] e.g.
        // [
        //   { prop: 'foo' },
        //   { prop: 'baz' }
        // ]
        if (_.isArray(data)) {
          results = fuzzaldrinPlus.filter(data, search_text, {
            key: this.options.keys
          });
        } else {
          // If data is grouped therefore an [object Object]. e.g.
          // {
          //   groupName1: [
          //     { prop: 'foo' },
          //     { prop: 'baz' }
          //   ],
          //   groupName2: [
          //     { prop: 'abc' },
          //     { prop: 'def' }
          //   ]
          // }
          if (isObject(data)) {
            results = {};
            for (key in data) {
              group = data[key];
              tmp = fuzzaldrinPlus.filter(group, search_text, {
                key: this.options.keys
              });
              if (tmp.length) {
                results[key] = tmp.map(function(item) {
                  return item;
                });
              }
            }
          }
        }
      }
      return this.options.callback(results);
    } else {
      elements = this.options.elements();
      if (search_text) {
        elements.each(function() {
          var $el, matches;
          $el = $(this);
          matches = fuzzaldrinPlus.match($el.text().trim(), search_text);
          if (!$el.is('.dropdown-header')) {
            if (matches.length) {
              return $el.show().removeClass('option-hidden');
            } else {
              return $el.hide().addClass('option-hidden');
            }
          }
        });
      } else {
        elements.show().removeClass('option-hidden');
      }

      elements.parent().find('.dropdown-menu-empty-item').toggleClass('hidden', elements.is(':visible'));
    }
  };

  return GitLabDropdownFilter;
})();

GitLabDropdownRemote = (function() {
  function GitLabDropdownRemote(dataEndpoint, options) {
    this.dataEndpoint = dataEndpoint;
    this.options = options;
  }

  GitLabDropdownRemote.prototype.execute = function() {
    if (typeof this.dataEndpoint === "string") {
      return this.fetchData();
    } else if (typeof this.dataEndpoint === "function") {
      if (this.options.beforeSend) {
        this.options.beforeSend();
      }
      return this.dataEndpoint("", (function(_this) {
        // Fetch the data by calling the data funcfion
        return function(data) {
          if (_this.options.success) {
            _this.options.success(data);
          }
          if (_this.options.beforeSend) {
            return _this.options.beforeSend();
          }
        };
      })(this));
    }
  };

  GitLabDropdownRemote.prototype.fetchData = function() {
    return $.ajax({
      url: this.dataEndpoint,
      dataType: this.options.dataType,
      beforeSend: (function(_this) {
        return function() {
          if (_this.options.beforeSend) {
            return _this.options.beforeSend();
          }
        };
      })(this),
      success: (function(_this) {
        return function(data) {
          if (_this.options.success) {
            return _this.options.success(data);
          }
        };
      })(this)
    });
  // Fetch the data through ajax if the data is a string
  };

  return GitLabDropdownRemote;
})();

GitLabDropdown = (function() {
  var ACTIVE_CLASS, FILTER_INPUT, NO_FILTER_INPUT, INDETERMINATE_CLASS, LOADING_CLASS, PAGE_TWO_CLASS, NON_SELECTABLE_CLASSES, SELECTABLE_CLASSES, CURSOR_SELECT_SCROLL_PADDING, currentIndex;

  LOADING_CLASS = "is-loading";

  PAGE_TWO_CLASS = "is-page-two";

  ACTIVE_CLASS = "is-active";

  INDETERMINATE_CLASS = "is-indeterminate";

  currentIndex = -1;

  NON_SELECTABLE_CLASSES = '.divider, .separator, .dropdown-header, .dropdown-menu-empty-item';

  SELECTABLE_CLASSES = ".dropdown-content li:not(" + NON_SELECTABLE_CLASSES + ", .option-hidden)";

  CURSOR_SELECT_SCROLL_PADDING = 5;

  FILTER_INPUT = '.dropdown-input .dropdown-input-field:not(.dropdown-no-filter)';

  NO_FILTER_INPUT = '.dropdown-input .dropdown-input-field.dropdown-no-filter';

  function GitLabDropdown(el1, options) {
    var searchFields, selector, self;
    this.el = el1;
    this.options = options;
    this.updateLabel = this.updateLabel.bind(this);
    this.hidden = this.hidden.bind(this);
    this.opened = this.opened.bind(this);
    this.shouldPropagate = this.shouldPropagate.bind(this);
    self = this;
    selector = $(this.el).data("target");
    this.dropdown = selector != null ? $(selector) : $(this.el).parent();
    // Set Defaults
    this.filterInput = this.options.filterInput || this.getElement(FILTER_INPUT);
    this.noFilterInput = this.options.noFilterInput || this.getElement(NO_FILTER_INPUT);
    this.highlight = !!this.options.highlight;
    this.filterInputBlur = this.options.filterInputBlur != null
      ? this.options.filterInputBlur
      : true;
    // If no input is passed create a default one
    self = this;
    // If selector was passed
    if (_.isString(this.filterInput)) {
      this.filterInput = this.getElement(this.filterInput);
    }
    searchFields = this.options.search ? this.options.search.fields : [];
    if (this.options.data) {
      // If we provided data
      // data could be an array of objects or a group of arrays
      if (_.isObject(this.options.data) && !_.isFunction(this.options.data)) {
        this.fullData = this.options.data;
        currentIndex = -1;
        this.parseData(this.options.data);
        this.focusTextInput();
      } else {
        this.remote = new GitLabDropdownRemote(this.options.data, {
          dataType: this.options.dataType,
          beforeSend: this.toggleLoading.bind(this),
          success: (function(_this) {
            return function(data) {
              _this.fullData = data;
              _this.parseData(_this.fullData);
              _this.focusTextInput(true);
              if (_this.options.filterable && _this.filter && _this.filter.input && _this.filter.input.val() && _this.filter.input.val().trim() !== '') {
                return _this.filter.input.trigger('input');
              }
            };
          // Remote data
          })(this),
          instance: this,
        });
      }
    }
    if (this.noFilterInput.length) {
      this.plainInput = new GitLabDropdownInput(this.noFilterInput, this.options);
      this.plainInput.onInput(this.addInput.bind(this));
    }
    // Init filterable
    if (this.options.filterable) {
      this.filter = new GitLabDropdownFilter(this.filterInput, {
        elIsInput: $(this.el).is('input'),
        filterInputBlur: this.filterInputBlur,
        filterByText: this.options.filterByText,
        onFilter: this.options.onFilter,
        remote: this.options.filterRemote,
        query: this.options.data,
        keys: searchFields,
        instance: this,
        elements: (function(_this) {
          return function() {
            selector = '.dropdown-content li:not(' + NON_SELECTABLE_CLASSES + ')';
            if (_this.dropdown.find('.dropdown-toggle-page').length) {
              selector = ".dropdown-page-one " + selector;
            }
            return $(selector);
          };
        })(this),
        data: (function(_this) {
          return function() {
            return _this.fullData;
          };
        })(this),
        callback: (function(_this) {
          return function(data) {
            _this.parseData(data);
            if (_this.filterInput.val() !== '') {
              selector = SELECTABLE_CLASSES;
              if (_this.dropdown.find('.dropdown-toggle-page').length) {
                selector = ".dropdown-page-one " + selector;
              }
              if ($(_this.el).is('input')) {
                currentIndex = -1;
              } else {
                $(selector, _this.dropdown).first().find('a').addClass('is-focused');
                currentIndex = 0;
              }
            }
          };
        })(this)
      });
    }
    // Event listeners
    this.dropdown.on("shown.bs.dropdown", this.opened);
    this.dropdown.on("hidden.bs.dropdown", this.hidden);
    $(this.el).on("update.label", this.updateLabel);
    this.dropdown.on("click", ".dropdown-menu, .dropdown-menu-close", this.shouldPropagate);
    this.dropdown.on('keyup', (function(_this) {
      return function(e) {
        // Escape key
        if (e.which === 27) {
          return $('.dropdown-menu-close', _this.dropdown).trigger('click');
        }
      };
    })(this));
    this.dropdown.on('blur', 'a', (function(_this) {
      return function(e) {
        var $dropdownMenu, $relatedTarget;
        if (e.relatedTarget != null) {
          $relatedTarget = $(e.relatedTarget);
          $dropdownMenu = $relatedTarget.closest('.dropdown-menu');
          if ($dropdownMenu.length === 0) {
            return _this.dropdown.removeClass('open');
          }
        }
      };
    })(this));
    if (this.dropdown.find(".dropdown-toggle-page").length) {
      this.dropdown.find(".dropdown-toggle-page, .dropdown-menu-back").on("click", (function(_this) {
        return function(e) {
          e.preventDefault();
          e.stopPropagation();
          return _this.togglePage();
        };
      })(this));
    }
    if (this.options.selectable) {
      selector = ".dropdown-content a";
      if (this.dropdown.find(".dropdown-toggle-page").length) {
        selector = ".dropdown-page-one .dropdown-content a";
      }
      this.dropdown.on("click", selector, function(e) {
        var $el, selected, selectedObj, isMarking;
        $el = $(e.currentTarget);
        selected = self.rowClicked($el);
        selectedObj = selected ? selected[0] : null;
        isMarking = selected ? selected[1] : null;
        if (this.options.clicked) {
          this.options.clicked.call(this, {
            selectedObj,
            $el,
            e,
            isMarking,
          });
        }

        // Update label right after all modifications in dropdown has been done
        if (this.options.toggleLabel) {
          this.updateLabel(selectedObj, $el, this);
        }

        $el.trigger('blur');
      }.bind(this));
    }
  }

  // Finds an element inside wrapper element
  GitLabDropdown.prototype.getElement = function(selector) {
    return this.dropdown.find(selector);
  };

  GitLabDropdown.prototype.toggleLoading = function() {
    return $('.dropdown-menu', this.dropdown).toggleClass(LOADING_CLASS);
  };

  GitLabDropdown.prototype.togglePage = function() {
    var menu;
    menu = $('.dropdown-menu', this.dropdown);
    if (menu.hasClass(PAGE_TWO_CLASS)) {
      if (this.remote) {
        this.remote.execute();
      }
    }
    menu.toggleClass(PAGE_TWO_CLASS);
    // Focus first visible input on active page
    return this.dropdown.find('[class^="dropdown-page-"]:visible :text:visible:first').focus();
  };

  GitLabDropdown.prototype.parseData = function(data) {
    var full_html, groupData, html, name;
    this.renderedData = data;
    if (this.options.filterable && data.length === 0) {
      // render no matching results
      html = [this.noResults()];
    } else {
      // Handle array groups
      if (isObject(data)) {
        html = [];
        for (name in data) {
          groupData = data[name];
          html.push(this.renderItem({
            header: name
          // Add header for each group
          }, name));
          this.renderData(groupData, name).map(function(item) {
            return html.push(item);
          });
        }
      } else {
        // Render each row
        html = this.renderData(data);
      }
    }
    // Render the full menu
    full_html = this.renderMenu(html);
    return this.appendMenu(full_html);
  };

  GitLabDropdown.prototype.renderData = function(data, group) {
    if (group == null) {
      group = false;
    }
    return data.map((function(_this) {
      return function(obj, index) {
        return _this.renderItem(obj, group, index);
      };
    })(this));
  };

  GitLabDropdown.prototype.shouldPropagate = function(e) {
    var $target;
    if (this.options.multiSelect || this.options.shouldPropagate === false) {
      $target = $(e.target);
      if ($target && !$target.hasClass('dropdown-menu-close') &&
                     !$target.hasClass('dropdown-menu-close-icon') &&
                     !$target.data('is-link')) {
        e.stopPropagation();
        return false;
      } else {
        return true;
      }
    }
  };

  GitLabDropdown.prototype.filteredFullData = function() {
    return this.fullData.filter(r => typeof r === 'object'
      && !Object.prototype.hasOwnProperty.call(r, 'beforeDivider')
      && !Object.prototype.hasOwnProperty.call(r, 'header')
    );
  };

  GitLabDropdown.prototype.opened = function(e) {
    var contentHtml;
    this.resetRows();
    this.addArrowKeyEvent();

    const dropdownToggle = this.dropdown.find('.dropdown-menu-toggle');
    const hasFilterBulkUpdate = dropdownToggle.hasClass('js-filter-bulk-update');
    const hasMultiSelect = dropdownToggle.hasClass('js-multiselect');

    // Makes indeterminate items effective
    if (this.fullData && hasFilterBulkUpdate) {
      this.parseData(this.fullData);
    }

    // Process the data to make sure rendered data
    // matches the correct layout
    const inputValue = this.filterInput.val();
    if (this.fullData && hasMultiSelect && this.options.processData && inputValue.length === 0) {
      this.options.processData.call(this.options, inputValue, this.filteredFullData(), this.parseData.bind(this));
    }

    contentHtml = $('.dropdown-content', this.dropdown).html();
    if (this.remote && contentHtml === "") {
      this.remote.execute();
    } else {
      this.focusTextInput();
    }

    if (this.options.showMenuAbove) {
      this.positionMenuAbove();
    }

    if (this.options.opened) {
      this.options.opened.call(this, e);
    }

    return this.dropdown.trigger('shown.gl.dropdown');
  };

  GitLabDropdown.prototype.positionMenuAbove = function() {
    var $menu = this.dropdown.find('.dropdown-menu');

    $menu.css('top', 'initial');
    $menu.css('bottom', '100%');
  };

  GitLabDropdown.prototype.hidden = function(e) {
    var $input;
    this.resetRows();
    this.removeArrayKeyEvent();
    $input = this.dropdown.find(".dropdown-input-field");
    if (this.options.filterable) {
      $input.blur();
    }
    if (this.dropdown.find(".dropdown-toggle-page").length) {
      $('.dropdown-menu', this.dropdown).removeClass(PAGE_TWO_CLASS);
    }
    if (this.options.hidden) {
      this.options.hidden.call(this, e);
    }
    return this.dropdown.trigger('hidden.gl.dropdown');
  };

  // Render the full menu
  GitLabDropdown.prototype.renderMenu = function(html) {
    if (this.options.renderMenu) {
      return this.options.renderMenu(html);
    } else {
      var ul = document.createElement('ul');

      for (var i = 0; i < html.length; i += 1) {
        var el = html[i];

        if (el instanceof jQuery) {
          el = el.get(0);
        }

        if (typeof el === 'string') {
          ul.innerHTML += el;
        } else {
          ul.appendChild(el);
        }
      }

      return ul;
    }
  };

  // Append the menu into the dropdown
  GitLabDropdown.prototype.appendMenu = function(html) {
    return this.clearMenu().append(html);
  };

  GitLabDropdown.prototype.clearMenu = function() {
    var selector;
    selector = '.dropdown-content';
    if (this.dropdown.find(".dropdown-toggle-page").length) {
      selector = ".dropdown-page-one .dropdown-content";
    }

    return $(selector, this.dropdown).empty();
  };

  GitLabDropdown.prototype.renderItem = function(data, group, index) {
    var field, fieldName, html, selected, text, url, value;
    if (group == null) {
      group = false;
    }
    if (index == null) {
      // Render the row
      index = false;
    }
    html = document.createElement('li');
    if (data === 'divider' || data === 'separator') {
      html.className = data;
      return html;
    }
    // Header
    if (data.header != null) {
      html.className = 'dropdown-header';
      html.innerHTML = data.header;
      return html;
    }
    if (this.options.renderRow) {
      // Call the render function
      html = this.options.renderRow.call(this.options, data, this);
    } else {
      if (!selected) {
        value = this.options.id ? this.options.id(data) : data.id;
        fieldName = this.options.fieldName;

        if (value) {
          value = value.toString().replace(/'/g, '\\\'');
          field = this.dropdown.parent().find(`input[name='${fieldName}'][value='${value}']`);
          if (field.length) {
            selected = true;
          }
        } else {
          field = this.dropdown.parent().find(`input[name='${fieldName}']`);
          selected = !field.length;
        }
      }
      // Set URL
      if (this.options.url != null) {
        url = this.options.url(data);
      } else {
        url = data.url != null ? data.url : '#';
      }
      // Set Text
      if (this.options.text != null) {
        text = this.options.text(data);
      } else {
        text = data.text != null ? data.text : '';
      }
      if (this.highlight) {
        text = this.highlightTextMatches(text, this.filterInput.val());
      }
      // Create the list item & the link
      var link = document.createElement('a');

      link.href = url;

      if (this.highlight) {
        link.innerHTML = text;
      } else {
        link.textContent = text;
      }

      if (selected) {
        link.className = 'is-active';
      }

      if (group) {
        link.dataset.group = group;
        link.dataset.index = index;
      }

      html.appendChild(link);
    }
    return html;
  };

  GitLabDropdown.prototype.highlightTextMatches = function(text, term) {
    const occurrences = fuzzaldrinPlus.match(text, term);
    const indexOf = [].indexOf;
    return text.split('').map(function(character, i) {
      if (indexOf.call(occurrences, i) !== -1) {
        return "<b>" + character + "</b>";
      } else {
        return character;
      }
    }).join('');
  };

  GitLabDropdown.prototype.noResults = function() {
    var html;
    return '<li class="dropdown-menu-empty-item"><a>No matching results</a></li>';
  };

  GitLabDropdown.prototype.rowClicked = function(el) {
    var field, fieldName, groupName, isInput, selectedIndex, selectedObject, value, isMarking;

    fieldName = this.options.fieldName;
    isInput = $(this.el).is('input');
    if (this.renderedData) {
      groupName = el.data('group');
      if (groupName) {
        selectedIndex = el.data('index');
        selectedObject = this.renderedData[groupName][selectedIndex];
      } else {
        selectedIndex = el.closest('li').index();
        selectedObject = this.renderedData[selectedIndex];
      }
    }

    if (this.options.vue) {
      if (el.hasClass(ACTIVE_CLASS)) {
        el.removeClass(ACTIVE_CLASS);
      } else {
        el.addClass(ACTIVE_CLASS);
      }

      return [selectedObject];
    }

    field = [];
    value = this.options.id
      ? this.options.id(selectedObject, el)
      : selectedObject.id;
    if (isInput) {
      field = $(this.el);
    } else if (value) {
      field = this.dropdown.parent().find("input[name='" + fieldName + "'][value='" + value.toString().replace(/'/g, '\\\'') + "']");
    }

    if (this.options.isSelectable && !this.options.isSelectable(selectedObject, el)) {
      return;
    }

    if (el.hasClass(ACTIVE_CLASS)) {
      isMarking = false;
      el.removeClass(ACTIVE_CLASS);
      if (field && field.length) {
        this.clearField(field, isInput);
      }
    } else if (el.hasClass(INDETERMINATE_CLASS)) {
      isMarking = true;
      el.addClass(ACTIVE_CLASS);
      el.removeClass(INDETERMINATE_CLASS);
      if (field && field.length && value == null) {
        this.clearField(field, isInput);
      }
      if ((!field || !field.length) && fieldName) {
        this.addInput(fieldName, value, selectedObject);
      }
    } else {
      isMarking = true;
      if (!this.options.multiSelect || el.hasClass('dropdown-clear-active')) {
        this.dropdown.find("." + ACTIVE_CLASS).removeClass(ACTIVE_CLASS);
        if (!isInput) {
          this.dropdown.parent().find("input[name='" + fieldName + "']").remove();
        }
      }
      if (field && field.length && value == null) {
        this.clearField(field, isInput);
      }
      // Toggle active class for the tick mark
      el.addClass(ACTIVE_CLASS);
      if (value != null) {
        if ((!field || !field.length) && fieldName) {
          this.addInput(fieldName, value, selectedObject);
        } else if (field && field.length) {
          field.val(value).trigger('change');
        }
      }
    }

    return [selectedObject, isMarking];
  };

  GitLabDropdown.prototype.focusTextInput = function(triggerFocus = false) {
    if (this.options.filterable) {
      this.dropdown.one('transitionend', () => {
        const initialScrollTop = $(window).scrollTop();

        if (this.dropdown.is('.open')) {
          this.filterInput.focus();
        }

        if ($(window).scrollTop() < initialScrollTop) {
          $(window).scrollTop(initialScrollTop);
        }
      });

      if (triggerFocus) {
        // This triggers after a ajax request
        // in case of slow requests, the dropdown transition could already be finished
        this.dropdown.trigger('transitionend');
      }
    }
  };

  GitLabDropdown.prototype.addInput = function(fieldName, value, selectedObject, single) {
    var $input;
    // Create hidden input for form
    if (single) {
      $('input[name="' + fieldName + '"]').remove();
    }

    $input = $('<input>').attr('type', 'hidden').attr('name', fieldName).val(value);
    if (this.options.inputId != null) {
      $input.attr('id', this.options.inputId);
    }

    if (this.options.multiSelect) {
      Object.keys(selectedObject).forEach((attribute) => {
        $input.attr(`data-${attribute}`, selectedObject[attribute]);
      });
    }

    if (this.options.inputMeta) {
      $input.attr('data-meta', selectedObject[this.options.inputMeta]);
    }

    this.dropdown.before($input).trigger('change');
  };

  GitLabDropdown.prototype.selectRowAtIndex = function(index) {
    var $el, selector;
    // If we pass an option index
    if (typeof index !== "undefined") {
      selector = SELECTABLE_CLASSES + ":eq(" + index + ") a";
    } else {
      selector = ".dropdown-content .is-focused";
    }
    if (this.dropdown.find(".dropdown-toggle-page").length) {
      selector = ".dropdown-page-one " + selector;
    }
    // simulate a click on the first link
    $el = $(selector, this.dropdown);
    if ($el.length) {
      var href = $el.attr('href');
      if (href && href !== '#') {
        gl.utils.visitUrl(href);
      } else {
        $el.first().trigger('click');
      }
    }
  };

  GitLabDropdown.prototype.addArrowKeyEvent = function() {
    var $input, ARROW_KEY_CODES, selector;
    ARROW_KEY_CODES = [38, 40];
    $input = this.dropdown.find(".dropdown-input-field");
    selector = SELECTABLE_CLASSES;
    if (this.dropdown.find(".dropdown-toggle-page").length) {
      selector = ".dropdown-page-one " + selector;
    }
    return $('body').on('keydown', (function(_this) {
      return function(e) {
        var $listItems, PREV_INDEX, currentKeyCode;
        currentKeyCode = e.which;
        if (ARROW_KEY_CODES.indexOf(currentKeyCode) !== -1) {
          e.preventDefault();
          e.stopImmediatePropagation();
          PREV_INDEX = currentIndex;
          $listItems = $(selector, _this.dropdown);
          // if @options.filterable
          //   $input.blur()
          if (currentKeyCode === 40) {
            // Move down
            if (currentIndex < ($listItems.length - 1)) {
              currentIndex += 1;
            }
          } else if (currentKeyCode === 38) {
            // Move up
            if (currentIndex > 0) {
              currentIndex -= 1;
            }
          }
          if (currentIndex !== PREV_INDEX) {
            _this.highlightRowAtIndex($listItems, currentIndex);
          }
          return false;
        }
        if (currentKeyCode === 13 && currentIndex !== -1) {
          e.preventDefault();
          _this.selectRowAtIndex();
        }
      };
    })(this));
  };

  GitLabDropdown.prototype.removeArrayKeyEvent = function() {
    return $('body').off('keydown');
  };

  GitLabDropdown.prototype.resetRows = function resetRows() {
    currentIndex = -1;
    $('.is-focused', this.dropdown).removeClass('is-focused');
  };

  GitLabDropdown.prototype.highlightRowAtIndex = function($listItems, index) {
    var $dropdownContent, $listItem, dropdownContentBottom, dropdownContentHeight, dropdownContentTop, dropdownScrollTop, listItemBottom, listItemHeight, listItemTop;
    // Remove the class for the previously focused row
    $('.is-focused', this.dropdown).removeClass('is-focused');
    // Update the class for the row at the specific index
    $listItem = $listItems.eq(index);
    $listItem.find('a:first-child').addClass("is-focused");
    // Dropdown content scroll area
    $dropdownContent = $listItem.closest('.dropdown-content');
    dropdownScrollTop = $dropdownContent.scrollTop();
    dropdownContentHeight = $dropdownContent.outerHeight();
    dropdownContentTop = $dropdownContent.prop('offsetTop');
    dropdownContentBottom = dropdownContentTop + dropdownContentHeight;
    // Get the offset bottom of the list item
    listItemHeight = $listItem.outerHeight();
    listItemTop = $listItem.prop('offsetTop');
    listItemBottom = listItemTop + listItemHeight;
    if (!index) {
      // Scroll the dropdown content to the top
      $dropdownContent.scrollTop(0);
    } else if (index === ($listItems.length - 1)) {
      // Scroll the dropdown content to the bottom
      $dropdownContent.scrollTop($dropdownContent.prop('scrollHeight'));
    } else if (listItemBottom > (dropdownContentBottom + dropdownScrollTop)) {
      // Scroll the dropdown content down
      $dropdownContent.scrollTop(listItemBottom - dropdownContentBottom + CURSOR_SELECT_SCROLL_PADDING);
    } else if (listItemTop < (dropdownContentTop + dropdownScrollTop)) {
      // Scroll the dropdown content up
      return $dropdownContent.scrollTop(listItemTop - dropdownContentTop - CURSOR_SELECT_SCROLL_PADDING);
    }
  };

  GitLabDropdown.prototype.updateLabel = function(selected, el, instance) {
    if (selected == null) {
      selected = null;
    }
    if (el == null) {
      el = null;
    }
    if (instance == null) {
      instance = null;
    }

    let toggleText = this.options.toggleLabel(selected, el, instance);
    if (this.options.updateLabel) {
      // Option to override the dropdown label text
      toggleText = this.options.updateLabel;
    }

    return $(this.el).find(".dropdown-toggle-text").text(toggleText);
  };

  GitLabDropdown.prototype.clearField = function(field, isInput) {
    return isInput ? field.val('') : field.remove();
  };

  return GitLabDropdown;
})();

$.fn.glDropdown = function(opts) {
  return this.each(function() {
    if (!$.data(this, 'glDropdown')) {
      return $.data(this, 'glDropdown', new GitLabDropdown(this, opts));
    }
  });
};