/**
 * 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.
 */
const os = require('os');
const expect = require('expect');
const {getTestState,setupTestBrowserHooks,setupTestPageAndContextHooks} = require('./mocha-utils');

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

describe('Mouse', function() {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();
  it('should click the document', async() => {
    const {page} = getTestState();

    await page.evaluate(() => {
      window.clickPromise = new Promise(resolve => {
        document.addEventListener('click', event => {
          resolve({
            type: event.type,
            detail: event.detail,
            clientX: event.clientX,
            clientY: event.clientY,
            isTrusted: event.isTrusted,
            button: event.button
          });
        });
      });
    });
    await page.mouse.click(50, 60);
    const event = await page.evaluate(() => window.clickPromise);
    expect(event.type).toBe('click');
    expect(event.detail).toBe(1);
    expect(event.clientX).toBe(50);
    expect(event.clientY).toBe(60);
    expect(event.isTrusted).toBe(true);
    expect(event.button).toBe(0);
  });
  itFailsFirefox('should resize the textarea', async() => {
    const {page, server} = getTestState();

    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(Math.round(width + 104));
    expect(newDimensions.height).toBe(Math.round(height + 104));
  });
  itFailsFirefox('should select the text with mouse', async() => {
    const {page, server} = getTestState();

    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);
    // Firefox needs an extra frame here after typing or it will fail to set the scrollTop
    await page.evaluate(() => new Promise(requestAnimationFrame));
    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(() => {
      const textarea = document.querySelector('textarea');
      return textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);
    })).toBe(text);
  });
  itFailsFirefox('should trigger hover state', async() => {
    const {page, server} = getTestState();

    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');
  });
  itFailsFirefox('should trigger hover state with removed window.Node', async() => {
    const {page, server} = getTestState();

    await page.goto(server.PREFIX + '/input/scrollable.html');
    await page.evaluate(() => delete window.Node);
    await page.hover('#button-6');
    expect(await page.evaluate(() => document.querySelector('button:hover').id)).toBe('button-6');
  });
  it('should set modifier keys on click', async() => {
    const {page, server, isFirefox} = getTestState();

    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'};
    // In Firefox, the Meta modifier only exists on Mac
    if (isFirefox && os.platform() !== 'darwin')
      delete modifiers['Meta'];
    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])))
        throw new Error(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])))
        throw new Error(modifiers[modifier] + ' should be false');
    }
  });
  itFailsFirefox('should tween mouse movement', async() => {
    const {page} = getTestState();

    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]
    ]);
  });
  // @see https://crbug.com/929806
  itFailsFirefox('should work with mobile viewports and cross process navigations', async() => {
    const {page, server} = getTestState();

    await page.goto(server.EMPTY_PAGE);
    await page.setViewport({width: 360, height: 640, isMobile: true});
    await page.goto(server.CROSS_PROCESS_PREFIX + '/mobile.html');
    await page.evaluate(() => {
      document.addEventListener('click', event => {
        window.result = {x: event.clientX, y: event.clientY};
      });
    });

    await page.mouse.click(30, 40);

    expect(await page.evaluate('result')).toEqual({x: 30, y: 40});
  });
});