/**
 * Copyright 2017 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 path = require('path');
const expect = require('expect');
const {getTestState,setupTestBrowserHooks,setupTestPageAndContextHooks} = require('./mocha-utils');

const FILE_TO_UPLOAD = path.join(__dirname, '/assets/file-to-upload.txt');

describe('input tests', function() {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();

  describeFailsFirefox('input', function() {
    it('should upload the file', async() => {
      const {page, server} = getTestState();

      await page.goto(server.PREFIX + '/input/fileupload.html');
      const filePath = path.relative(process.cwd(), FILE_TO_UPLOAD);
      const input = await page.$('input');
      await page.evaluate(e => {
        window._inputEvents = [];
        e.addEventListener('change', ev => window._inputEvents.push(ev.type));
        e.addEventListener('input', ev => window._inputEvents.push(ev.type));
      }, input);
      await input.uploadFile(filePath);
      expect(await page.evaluate(e => e.files[0].name, input)).toBe('file-to-upload.txt');
      expect(await page.evaluate(e => e.files[0].type, input)).toBe('text/plain');
      expect(await page.evaluate(() => window._inputEvents)).toEqual(['input', 'change']);
      expect(await page.evaluate(e => {
        const reader = new FileReader();
        const promise = new Promise(fulfill => reader.onload = fulfill);
        reader.readAsText(e.files[0]);
        return promise.then(() => reader.result);
      }, input)).toBe('contents of the file');
    });
  });

  describeFailsFirefox('Page.waitForFileChooser', function() {
    it('should work when file input is attached to DOM', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      expect(chooser).toBeTruthy();
    });
    it('should work when file input is not attached to DOM', async() => {
      const {page} = getTestState();

      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.evaluate(() => {
          const el = document.createElement('input');
          el.type = 'file';
          el.click();
        }),
      ]);
      expect(chooser).toBeTruthy();
    });
    it('should respect timeout', async() => {
      const {page, puppeteer} = getTestState();

      let error = null;
      await page.waitForFileChooser({timeout: 1}).catch(e => error = e);
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should respect default timeout when there is no custom timeout', async() => {
      const {page, puppeteer} = getTestState();

      page.setDefaultTimeout(1);
      let error = null;
      await page.waitForFileChooser().catch(e => error = e);
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should prioritize exact timeout over default timeout', async() => {
      const {page, puppeteer} = getTestState();

      page.setDefaultTimeout(0);
      let error = null;
      await page.waitForFileChooser({timeout: 1}).catch(e => error = e);
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should work with no timeout', async() => {
      const {page} = getTestState();

      const [chooser] = await Promise.all([
        page.waitForFileChooser({timeout: 0}),
        page.evaluate(() => setTimeout(() => {
          const el = document.createElement('input');
          el.type = 'file';
          el.click();
        }, 50))
      ]);
      expect(chooser).toBeTruthy();
    });
    it('should return the same file chooser when there are many watchdogs simultaneously', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [fileChooser1, fileChooser2] = await Promise.all([
        page.waitForFileChooser(),
        page.waitForFileChooser(),
        page.$eval('input', input => input.click()),
      ]);
      expect(fileChooser1 === fileChooser2).toBe(true);
    });
  });

  describeFailsFirefox('FileChooser.accept', function() {
    it('should accept single file', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file oninput='javascript:console.timeStamp()'>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      await Promise.all([
        chooser.accept([FILE_TO_UPLOAD]),
        new Promise(x => page.once('metrics', x)),
      ]);
      expect(await page.$eval('input', input => input.files.length)).toBe(1);
      expect(await page.$eval('input', input => input.files[0].name)).toBe('file-to-upload.txt');
    });
    it('should be able to read selected file', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      page.waitForFileChooser().then(chooser => chooser.accept([FILE_TO_UPLOAD]));
      expect(await page.$eval('input', async picker => {
        picker.click();
        await new Promise(x => picker.oninput = x);
        const reader = new FileReader();
        const promise = new Promise(fulfill => reader.onload = fulfill);
        reader.readAsText(picker.files[0]);
        return promise.then(() => reader.result);
      })).toBe('contents of the file');
    });
    it('should be able to reset selected files with empty file list', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      page.waitForFileChooser().then(chooser => chooser.accept([FILE_TO_UPLOAD]));
      expect(await page.$eval('input', async picker => {
        picker.click();
        await new Promise(x => picker.oninput = x);
        return picker.files.length;
      })).toBe(1);
      page.waitForFileChooser().then(chooser => chooser.accept([]));
      expect(await page.$eval('input', async picker => {
        picker.click();
        await new Promise(x => picker.oninput = x);
        return picker.files.length;
      })).toBe(0);
    });
    it('should not accept multiple files for single-file input', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      let error = null;
      await chooser.accept([
        path.relative(process.cwd(), __dirname + '/assets/file-to-upload.txt'),
        path.relative(process.cwd(), __dirname + '/assets/pptr.png'),
      ]).catch(e => error = e);
      expect(error).not.toBe(null);
    });
    it('should fail for non-existent files', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      let error = null;
      await chooser.accept(['file-does-not-exist.txt']).catch(e => error = e);
      expect(error).not.toBe(null);
    });
    it('should fail when accepting file chooser twice', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [fileChooser] = await Promise.all([
        page.waitForFileChooser(),
        page.$eval('input', input => input.click()),
      ]);
      await fileChooser.accept([]);
      let error = null;
      await fileChooser.accept([]).catch(e => error = e);
      expect(error.message).toBe('Cannot accept FileChooser which is already handled!');
    });
  });

  describeFailsFirefox('FileChooser.cancel', function() {
    it('should cancel dialog', async() => {
      const {page} = getTestState();

      // Consider file chooser canceled if we can summon another one.
      // There's no reliable way in WebPlatform to see that FileChooser was
      // canceled.
      await page.setContent(`<input type=file>`);
      const [fileChooser1] = await Promise.all([
        page.waitForFileChooser(),
        page.$eval('input', input => input.click()),
      ]);
      await fileChooser1.cancel();
      // If this resolves, than we successfully canceled file chooser.
      await Promise.all([
        page.waitForFileChooser(),
        page.$eval('input', input => input.click()),
      ]);
    });
    it('should fail when canceling file chooser twice', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [fileChooser] = await Promise.all([
        page.waitForFileChooser(),
        page.$eval('input', input => input.click()),
      ]);
      await fileChooser.cancel();
      let error = null;
      await fileChooser.cancel().catch(e => error = e);
      expect(error.message).toBe('Cannot cancel FileChooser which is already handled!');
    });
  });

  describeFailsFirefox('FileChooser.isMultiple', () => {
    it('should work for single file pick', async() => {
      const {page} = getTestState();

      await page.setContent(`<input type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      expect(chooser.isMultiple()).toBe(false);
    });
    it('should work for "multiple"', async() => {
      const {page} = getTestState();

      await page.setContent(`<input multiple type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      expect(chooser.isMultiple()).toBe(true);
    });
    it('should work for "webkitdirectory"', async() => {
      const {page} = getTestState();

      await page.setContent(`<input multiple webkitdirectory type=file>`);
      const [chooser] = await Promise.all([
        page.waitForFileChooser(),
        page.click('input'),
      ]);
      expect(chooser.isMultiple()).toBe(true);
    });
  });
});