/* eslint-disable comma-dangle, no-param-reassign, no-unused-expressions, max-len */

require('~/gl_dropdown');
require('~/lib/utils/common_utils');
require('~/lib/utils/type_utility');
require('~/lib/utils/url_utility');

(() => {
  const NON_SELECTABLE_CLASSES = '.divider, .separator, .dropdown-header, .dropdown-menu-empty-link';
  const SEARCH_INPUT_SELECTOR = '.dropdown-input-field';
  const ITEM_SELECTOR = `.dropdown-content li:not(${NON_SELECTABLE_CLASSES})`;
  const FOCUSED_ITEM_SELECTOR = `${ITEM_SELECTOR} a.is-focused`;

  const ARROW_KEYS = {
    DOWN: 40,
    UP: 38,
    ENTER: 13,
    ESC: 27
  };

  let remoteCallback;

  const navigateWithKeys = function navigateWithKeys(direction, steps, cb, i) {
    i = i || 0;
    if (!i) direction = direction.toUpperCase();
    $('body').trigger({
      type: 'keydown',
      which: ARROW_KEYS[direction],
      keyCode: ARROW_KEYS[direction]
    });
    i += 1;
    if (i <= steps) {
      navigateWithKeys(direction, steps, cb, i);
    } else {
      cb();
    }
  };

  const remoteMock = function remoteMock(data, term, callback) {
    remoteCallback = callback.bind({}, data);
  };

  describe('Dropdown', function describeDropdown() {
    preloadFixtures('static/gl_dropdown.html.raw');
    loadJSONFixtures('projects.json');

    function initDropDown(hasRemote, isFilterable) {
      this.dropdownButtonElement = $('#js-project-dropdown', this.dropdownContainerElement).glDropdown({
        selectable: true,
        filterable: isFilterable,
        data: hasRemote ? remoteMock.bind({}, this.projectsData) : this.projectsData,
        search: {
          fields: ['name']
        },
        text: (project) => {
          (project.name_with_namespace || project.name);
        },
        id: (project) => {
          project.id;
        }
      });
    }

    beforeEach(() => {
      loadFixtures('static/gl_dropdown.html.raw');
      this.dropdownContainerElement = $('.dropdown.inline');
      this.$dropdownMenuElement = $('.dropdown-menu', this.dropdownContainerElement);
      this.projectsData = getJSONFixture('projects.json');
    });

    afterEach(() => {
      $('body').unbind('keydown');
      this.dropdownContainerElement.unbind('keyup');
    });

    it('should open on click', () => {
      initDropDown.call(this, false);
      expect(this.dropdownContainerElement).not.toHaveClass('open');
      this.dropdownButtonElement.click();
      expect(this.dropdownContainerElement).toHaveClass('open');
    });

    describe('that is open', () => {
      beforeEach(() => {
        initDropDown.call(this, false, false);
        this.dropdownButtonElement.click();
      });

      it('should select a following item on DOWN keypress', () => {
        expect($(FOCUSED_ITEM_SELECTOR, this.$dropdownMenuElement).length).toBe(0);
        const randomIndex = (Math.floor(Math.random() * (this.projectsData.length - 1)) + 0);
        navigateWithKeys('down', randomIndex, () => {
          expect($(FOCUSED_ITEM_SELECTOR, this.$dropdownMenuElement).length).toBe(1);
          expect($(`${ITEM_SELECTOR}:eq(${randomIndex}) a`, this.$dropdownMenuElement)).toHaveClass('is-focused');
        });
      });

      it('should select a previous item on UP keypress', () => {
        expect($(FOCUSED_ITEM_SELECTOR, this.$dropdownMenuElement).length).toBe(0);
        navigateWithKeys('down', (this.projectsData.length - 1), () => {
          expect($(FOCUSED_ITEM_SELECTOR, this.$dropdownMenuElement).length).toBe(1);
          const randomIndex = (Math.floor(Math.random() * (this.projectsData.length - 2)) + 0);
          navigateWithKeys('up', randomIndex, () => {
            expect($(FOCUSED_ITEM_SELECTOR, this.$dropdownMenuElement).length).toBe(1);
            expect($(`${ITEM_SELECTOR}:eq(${((this.projectsData.length - 2) - randomIndex)}) a`, this.$dropdownMenuElement)).toHaveClass('is-focused');
          });
        });
      });

      it('should click the selected item on ENTER keypress', () => {
        expect(this.dropdownContainerElement).toHaveClass('open');
        const randomIndex = Math.floor(Math.random() * (this.projectsData.length - 1)) + 0;
        navigateWithKeys('down', randomIndex, () => {
          spyOn(gl.utils, 'visitUrl').and.stub();
          navigateWithKeys('enter', null, () => {
            expect(this.dropdownContainerElement).not.toHaveClass('open');
            const link = $(`${ITEM_SELECTOR}:eq(${randomIndex}) a`, this.$dropdownMenuElement);
            expect(link).toHaveClass('is-active');
            const linkedLocation = link.attr('href');
            if (linkedLocation && linkedLocation !== '#') expect(gl.utils.visitUrl).toHaveBeenCalledWith(linkedLocation);
          });
        });
      });

      it('should close on ESC keypress', () => {
        expect(this.dropdownContainerElement).toHaveClass('open');
        this.dropdownContainerElement.trigger({
          type: 'keyup',
          which: ARROW_KEYS.ESC,
          keyCode: ARROW_KEYS.ESC
        });
        expect(this.dropdownContainerElement).not.toHaveClass('open');
      });
    });

    describe('opened and waiting for a remote callback', () => {
      beforeEach(() => {
        initDropDown.call(this, true, true);
        this.dropdownButtonElement.click();
      });

      it('should show loading indicator while search results are being fetched by backend', () => {
        const dropdownMenu = document.querySelector('.dropdown-menu');

        expect(dropdownMenu.className.indexOf('is-loading') !== -1).toEqual(true);
        remoteCallback();
        expect(dropdownMenu.className.indexOf('is-loading') !== -1).toEqual(false);
      });

      it('should not focus search input while remote task is not complete', () => {
        expect($(document.activeElement)).not.toEqual($(SEARCH_INPUT_SELECTOR));
        remoteCallback();
        expect($(document.activeElement)).toEqual($(SEARCH_INPUT_SELECTOR));
      });

      it('should focus search input after remote task is complete', () => {
        remoteCallback();
        expect($(document.activeElement)).toEqual($(SEARCH_INPUT_SELECTOR));
      });

      it('should focus on input when opening for the second time', () => {
        remoteCallback();
        this.dropdownContainerElement.trigger({
          type: 'keyup',
          which: ARROW_KEYS.ESC,
          keyCode: ARROW_KEYS.ESC
        });
        this.dropdownButtonElement.click();
        expect($(document.activeElement)).toEqual($(SEARCH_INPUT_SELECTOR));
      });
    });

    describe('input focus with array data', () => {
      it('should focus input when passing array data to drop down', () => {
        initDropDown.call(this, false, true);
        this.dropdownButtonElement.click();
        expect($(document.activeElement)).toEqual($(SEARCH_INPUT_SELECTOR));
      });
    });

    it('should still have input value on close and restore', () => {
      const $searchInput = $(SEARCH_INPUT_SELECTOR);
      initDropDown.call(this, false, true);
      $searchInput
        .trigger('focus')
        .val('g')
        .trigger('input');
      expect($searchInput.val()).toEqual('g');
      this.dropdownButtonElement.trigger('hidden.bs.dropdown');
      $searchInput
        .trigger('blur')
        .trigger('focus');
      expect($searchInput.val()).toEqual('g');
    });
  });
})();
