import { expect } from 'chai';
import { stub } from 'sinon';
import Input from './input';
import { DEFAULT_CLASSNAMES } from '../constants';

describe('components/input', () => {
  let instance;
  let choicesElement;

  beforeEach(() => {
    choicesElement = document.createElement('input');
    instance = new Input({
      element: choicesElement,
      type: 'text',
      classNames: DEFAULT_CLASSNAMES,
      placeholderValue: null,
      preventPaste: false,
    });
  });

  afterEach(() => {
    document.body.innerHTML = '';
    instance = null;
  });

  describe('constructor', () => {
    it('assigns choices element to class', () => {
      expect(instance.element).to.eql(choicesElement);
    });

    it('assigns classnames to class', () => {
      expect(instance.classNames).to.eql(DEFAULT_CLASSNAMES);
    });
  });

  describe('addEventListeners', () => {
    let addEventListenerStub;

    beforeEach(() => {
      addEventListenerStub = stub(instance.element, 'addEventListener');
    });

    afterEach(() => {
      addEventListenerStub.restore();
    });

    it('adds event listeners', () => {
      instance.addEventListeners();
      expect(['input', 'paste', 'focus', 'blur']).to.have.members(
        Array.from(
          { length: addEventListenerStub.callCount },
          (v, i) => addEventListenerStub.getCall(i).args[0],
        ),
      );
    });
  });

  describe('removeEventListeners', () => {
    let removeEventListenerStub;

    beforeEach(() => {
      removeEventListenerStub = stub(instance.element, 'removeEventListener');
    });

    afterEach(() => {
      removeEventListenerStub.restore();
    });

    it('removes event listeners', () => {
      instance.removeEventListeners();
      expect(removeEventListenerStub.callCount).to.equal(4);
      expect(removeEventListenerStub.getCall(0).args[0]).to.equal('input');
      expect(removeEventListenerStub.getCall(1).args[0]).to.equal('paste');
      expect(removeEventListenerStub.getCall(2).args[0]).to.equal('focus');
      expect(removeEventListenerStub.getCall(3).args[0]).to.equal('blur');
    });
  });

  describe('_onInput', () => {
    let setWidthStub;

    beforeEach(() => {
      setWidthStub = stub(instance, 'setWidth');
    });

    afterEach(() => {
      setWidthStub.restore();
    });

    describe('when element is select one', () => {
      it('does not set input width', () => {
        instance.type = 'select-one';
        instance._onInput();
        expect(setWidthStub.callCount).to.equal(0);
      });
    });

    describe('when element is not a select one', () => {
      it('sets input width', () => {
        instance.type = 'text';
        instance._onInput();
        expect(setWidthStub.callCount).to.equal(1);
      });
    });
  });

  describe('_onPaste', () => {
    let eventMock;

    beforeEach(() => {
      eventMock = {
        preventDefault: stub(),
        target: instance.element,
      };
    });

    describe('when pasting is disabled and target is the element', () => {
      it('prevents default pasting behaviour', () => {
        instance.preventPaste = true;
        instance._onPaste(eventMock);
        expect(eventMock.preventDefault.callCount).to.equal(1);
      });
    });

    describe('when pasting is enabled', () => {
      it('does not prevent default pasting behaviour', () => {
        instance.preventPaste = false;
        instance._onPaste(eventMock);
        expect(eventMock.preventDefault.callCount).to.equal(0);
      });
    });
  });

  describe('_onFocus', () => {
    it('sets isFocussed flag to true', () => {
      expect(instance.isFocussed).to.equal(false);
      instance._onFocus();
      expect(instance.isFocussed).to.equal(true);
    });
  });

  describe('_onBlur', () => {
    it('sets isFocussed flag to false', () => {
      instance.isFocussed = true;
      instance._onBlur();
      expect(instance.isFocussed).to.equal(false);
    });
  });

  describe('enable', () => {
    beforeEach(() => {
      instance.element.setAttribute('disabled', '');
      instance.isDisabled = true;
      instance.enable();
    });

    it('removes disabled attribute', () => {
      expect(instance.element.getAttribute('disabled')).to.equal(null);
    });

    it('sets isDisabled flag to false', () => {
      expect(instance.isDisabled).to.equal(false);
    });
  });

  describe('disable', () => {
    beforeEach(() => {
      instance.element.removeAttribute('disabled', '');
      instance.isDisabled = false;
      instance.disable();
    });

    it('removes disabled attribute', () => {
      expect(instance.element.getAttribute('disabled')).to.equal('');
    });

    it('sets isDisabled flag to false', () => {
      expect(instance.isDisabled).to.equal(true);
    });
  });

  describe('focus', () => {
    let focusStub;

    beforeEach(() => {
      focusStub = stub(instance.element, 'focus');
    });

    afterEach(() => {
      focusStub.restore();
    });

    describe('when element is not focussed', () => {
      it('focuses element if isFocussed flag is set to false', () => {
        instance.isFocussed = true;
        instance.focus();
        expect(focusStub.callCount).to.equal(0);
      });
    });

    describe('when element is focussed', () => {
      it('focuses element if isFocussed flag is set to false', () => {
        instance.isFocussed = false;
        instance.focus();
        expect(focusStub.callCount).to.equal(1);
      });
    });
  });

  describe('blur', () => {
    let blurStub;

    beforeEach(() => {
      blurStub = stub(instance.element, 'blur');
    });

    afterEach(() => {
      blurStub.restore();
    });

    describe('when element is not focussed', () => {
      it("doesn't blur element", () => {
        instance.isFocussed = false;
        instance.blur();
        expect(blurStub.callCount).to.equal(0);
      });
    });

    describe('when element is focussed', () => {
      it('blurs element', () => {
        instance.isFocussed = true;
        instance.blur();
        expect(blurStub.callCount).to.equal(1);
      });
    });
  });

  describe('clear', () => {
    let setWidthStub;

    beforeEach(() => {
      setWidthStub = stub(instance, 'setWidth');
    });

    afterEach(() => {
      setWidthStub.restore();
    });

    it("removes the element's value if it has one", () => {
      instance.element.value = 'test';
      expect(instance.element.value).to.equal('test');
      instance.clear();
      expect(instance.element.value).to.equal('');
    });

    it("sets the element's width if flag passed", () => {
      expect(setWidthStub.callCount).to.equal(0);
      instance.clear(true);
      expect(setWidthStub.callCount).to.equal(1);
    });

    it('returns instance', () => {
      const response = instance.clear();
      expect(response).to.eql(instance);
    });
  });

  /**
   * Blocked by lack of ch support in JSDOM
   * @see {@link https://github.com/jsdom/cssstyle/pull/107}
   *
  describe('setWidth', () => {
    it('sets the width of the element based on input value and placeholder', () => {
      instance.placeholder = 'This is a placeholder';
      instance.element.value = 'This is a value';
      expect(instance.element.style.width).to.not.equal('16ch');
      instance.setWidth();
      expect(instance.element.style.width).to.equal('16ch');
      expect(instance.element.style.minWidth).to.equal('22ch');
    });
  });
  */

  describe('placeholder setter', () => {
    it('sets value of element to passed placeholder', () => {
      const placeholder = 'test';
      expect(instance.element.placeholder).to.equal('');
      instance.placeholder = placeholder;
      expect(instance.element.placeholder).to.equal(placeholder);
    });
  });

  describe('value setter', () => {
    it('sets value of element to passed value', () => {
      const value = 'test';
      expect(instance.element.value).to.equal('');
      instance.value = value;
      expect(instance.element.value).to.equal(value);
    });

    it('casts value to string', () => {
      const value = 1234;
      instance.value = value;
      expect(instance.element.value).to.equal(`${value}`);
    });
  });

  describe('value getter', () => {
    it('sets value of element to passed value', () => {
      const value = 'test';
      instance.element.value = value;
      expect(instance.value).to.equal(value);
    });

    it('strips HTML from value', () => {
      const value = '<script>somethingMalicious();</script>';
      instance.element.value = value;
      expect(instance.value).to.equal(
        '&lt;script&rt;somethingMalicious();&lt;/script&rt;',
      );
    });
  });

  describe('setActiveDescendant', () => {
    it("sets element's aria-activedescendant attribute with passed descendant ID", () => {
      const activeDescendantID = '1234';
      expect(instance.element.getAttribute('aria-activedescendant')).to.equal(
        null,
      );
      instance.setActiveDescendant(activeDescendantID);
      expect(instance.element.getAttribute('aria-activedescendant')).to.equal(
        activeDescendantID,
      );
    });
  });

  describe('removeActiveDescendant', () => {
    it("remove elememnt's aria-activedescendant attribute", () => {
      const activeDescendantID = '1234';
      instance.element.setAttribute(
        'aria-activedescendant',
        activeDescendantID,
      );
      expect(instance.element.getAttribute('aria-activedescendant')).to.equal(
        activeDescendantID,
      );
      instance.removeActiveDescendant();
      expect(instance.element.getAttribute('aria-activedescendant')).to.equal(
        null,
      );
    });
  });
});
