/**
 * Copyright 2018 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

function dimensions() {
  const rect = document.querySelector('textarea').getBoundingClientRect();
  return {
    x: rect.left,
    y: rect.top,
    width: rect.width,
    height: rect.height
  };
}

module.exports.addTests = function({testRunner, expect}) {
  const {describe, xdescribe, fdescribe} = testRunner;
  const {it, fit, xit} = testRunner;
  const {beforeAll, beforeEach, afterAll, afterEach} = testRunner;

  describe('Mouse', function() {
    it('should resize the textarea', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      const {x, y, width, height} = await page.evaluate(dimensions);
      const mouse = page.mouse;
      await mouse.move(x + width - 4, y + height - 4);
      await mouse.down();
      await mouse.move(x + width + 100, y + height + 100);
      await mouse.up();
      const newDimensions = await page.evaluate(dimensions);
      expect(newDimensions.width).toBe(width + 104);
      expect(newDimensions.height).toBe(height + 104);
    });
    it('should select the text with mouse', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.focus('textarea');
      const text = 'This is the text that we are going to try to select. Let\'s see how it goes.';
      await page.keyboard.type(text);
      await page.evaluate(() => document.querySelector('textarea').scrollTop = 0);
      const {x, y} = await page.evaluate(dimensions);
      await page.mouse.move(x + 2,y + 2);
      await page.mouse.down();
      await page.mouse.move(100,100);
      await page.mouse.up();
      expect(await page.evaluate(() => window.getSelection().toString())).toBe(text);
    });
    it('should trigger hover state', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/scrollable.html');
      await page.hover('#button-6');
      expect(await page.evaluate(() => document.querySelector('button:hover').id)).toBe('button-6');
      await page.hover('#button-2');
      expect(await page.evaluate(() => document.querySelector('button:hover').id)).toBe('button-2');
      await page.hover('#button-91');
      expect(await page.evaluate(() => document.querySelector('button:hover').id)).toBe('button-91');
    });
    it('should set modifier keys on click', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/scrollable.html');
      await page.evaluate(() => document.querySelector('#button-3').addEventListener('mousedown', e => window.lastEvent = e, true));
      const modifiers = {'Shift': 'shiftKey', 'Control': 'ctrlKey', 'Alt': 'altKey', 'Meta': 'metaKey'};
      for (const modifier in modifiers) {
        await page.keyboard.down(modifier);
        await page.click('#button-3');
        if (!(await page.evaluate(mod => window.lastEvent[mod], modifiers[modifier])))
          fail(modifiers[modifier] + ' should be true');
        await page.keyboard.up(modifier);
      }
      await page.click('#button-3');
      for (const modifier in modifiers) {
        if ((await page.evaluate(mod => window.lastEvent[mod], modifiers[modifier])))
          fail(modifiers[modifier] + ' should be false');
      }
    });
    it('should tween mouse movement', async({page, server}) => {
      await page.mouse.move(100, 100);
      await page.evaluate(() => {
        window.result = [];
        document.addEventListener('mousemove', event => {
          window.result.push([event.clientX, event.clientY]);
        });
      });
      await page.mouse.move(200, 300, {steps: 5});
      expect(await page.evaluate('result')).toEqual([
        [120, 140],
        [140, 180],
        [160, 220],
        [180, 260],
        [200, 300]
      ]);
    });
  });
};