<?php

namespace Drupal\paragraphs\Tests\Experimental;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Core\Entity\Entity\EntityFormDisplay;
use Drupal\Core\Language\LanguageInterface;
use Drupal\paragraphs\Entity\Paragraph;
use Drupal\node\Entity\Node;

/**
 * Tests the configuration of paragraphs.
 *
 * @group paragraphs
 */
class ParagraphsExperimentalTranslationTest extends ParagraphsExperimentalTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'paragraphs_demo',
    'content_translation',
    'link',
  );

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->loginAsAdmin([
      'administer site configuration',
      'create paragraphed_content_demo content',
      'edit any paragraphed_content_demo content',
      'delete any paragraphed_content_demo content',
      'administer content translation',
      'translate any entity',
      'create content translations',
      'administer languages',
    ]);
    $edit = [
      'settings[paragraph][nested_paragraph][translatable]' => TRUE,
      'settings[paragraph][nested_paragraph][settings][language][language_alterable]' => TRUE,
      'settings[paragraph][images][fields][field_images_demo]' => TRUE,
    ];
    $this->drupalPostForm('admin/config/regional/content-language', $edit, t('Save configuration'));
  }

  /**
   * Tests the paragraph translation.
   */
  public function testParagraphTranslation() {
    $this->drupalGet('admin/config/regional/content-language');

    // Check the settings are saved correctly.
    $this->assertFieldChecked('edit-entity-types-paragraph');
    $this->assertFieldChecked('edit-settings-node-paragraphed-content-demo-translatable');
    $this->assertFieldChecked('edit-settings-paragraph-text-image-translatable');
    $this->assertFieldChecked('edit-settings-paragraph-images-columns-field-images-demo-alt');
    $this->assertFieldChecked('edit-settings-paragraph-images-columns-field-images-demo-title');

    // Check if the publish/unpublish option works.
    $this->drupalGet('admin/structure/paragraphs_type/text_image/form-display');
    $edit = array(
      'fields[status][type]' => 'boolean_checkbox',
      'fields[status][region]' => 'content',
    );
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('node.paragraphed_content_demo.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('paragraph.nested_paragraph.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    $this->drupalPostForm(NULL, $edit, t('Save'));
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, NULL, t('Add Text + Image'));
    $this->assertRaw('edit-field-paragraphs-demo-0-subform-status-value');
    $edit = [
      'title[0][value]' => 'example_publish_unpublish',
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'Example published and unpublished',
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
    $this->assertText(t('Example published and unpublished'));
    $this->clickLink(t('Edit'));

    $this->drupalPostAjaxForm(NULL, NULL, 'field_paragraphs_demo_nested_paragraph_add_more');
    $this->drupalPostAjaxForm(NULL, NULL, 'field_paragraphs_demo_1_subform_field_paragraphs_demo_text_add_more');
    $edit = [
      'field_paragraphs_demo[0][subform][status][value]' => FALSE,
      'field_paragraphs_demo[1][subform][field_paragraphs_demo][0][subform][field_text_demo][0][value]' => 'Dummy text'
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
    $this->assertNoText(t('Example published and unpublished'));

    // Check the parent fields are set properly. Get the node.
    $node = $this->drupalGetNodeByTitle('example_publish_unpublish');
    // Loop over the paragraphs of the node.
    foreach ($node->field_paragraphs_demo->referencedEntities() as $paragraph) {
      $node_paragraph = Paragraph::load($paragraph->id())->toArray();
      // Check if the fields are set properly.
      $this->assertEqual($node_paragraph['parent_id'][0]['value'], $node->id());
      $this->assertEqual($node_paragraph['parent_type'][0]['value'], 'node');
      $this->assertEqual($node_paragraph['parent_field_name'][0]['value'], 'field_paragraphs_demo');
      // If the paragraph is nested type load the child.
      if ($node_paragraph['type'][0]['target_id'] == 'nested_paragraph') {
        $nested_paragraph = Paragraph::load($node_paragraph['field_paragraphs_demo'][0]['target_id'])->toArray();
        // Check if the fields are properly set.
        $this->assertEqual($nested_paragraph['parent_id'][0]['value'], $paragraph->id());
        $this->assertEqual($nested_paragraph['parent_type'][0]['value'], 'paragraph');
        $this->assertEqual($nested_paragraph['parent_field_name'][0]['value'], 'field_paragraphs_demo');
      }
    }

    // Add paragraphed content.
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, NULL, t('Add Text + Image'));
    $edit = array(
      'title[0][value]' => 'Title in english',
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'Text in english',
    );
    // The button to remove a paragraph is present.
    $this->assertRaw(t('Remove'));
    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
    $node = $this->drupalGetNodeByTitle('Title in english');
    // The text is present when editing again.
    $this->clickLink(t('Edit'));
    $this->assertText('Title in english');
    $this->assertText('Text in english');

    // Add french translation.
    $this->clickLink(t('Translate'));
    $this->clickLink(t('Add'), 1);
    // Make sure the Add / Remove paragraph buttons are hidden.
    $this->assertNoRaw(t('Remove'));
    $this->assertNoRaw(t('Add Text + Image'));
    // Make sure that the original paragraph text is displayed.
    $this->assertText('Text in english');

    $edit = array(
      'title[0][value]' => 'Title in french',
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'Text in french',
      'revision' => TRUE,
      'revision_log[0][value]' => 'french 1',
    );
    $this->drupalPostForm(NULL, $edit, t('Save and keep published (this translation)'));
    $this->assertText('Paragraphed article Title in french has been updated.');

    // Check the english translation.
    $this->drupalGet('node/' . $node->id());
    $this->assertText('Title in english');
    $this->assertText('Text in english');
    $this->assertNoText('Title in french');
    $this->assertNoText('Text in french');

    // Check the french translation.
    $this->drupalGet('fr/node/' . $node->id());
    $this->assertText('Title in french');
    $this->assertText('Text in french');
    $this->assertNoText('Title in english');
    // The translation is still present when editing again.
    $this->clickLink(t('Edit'));
    $this->assertText('Title in french');
    $this->assertText('Text in french');
    $edit = array(
      'title[0][value]' => 'Title Change in french',
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'New text in french',
      'revision' => TRUE,
      'revision_log[0][value]' => 'french 2',
    );
    $this->drupalPostForm(NULL, $edit, t('Save and keep published (this translation)'));
    $this->assertText('Title Change in french');
    $this->assertText('New text in french');

    // Back to the source language.
    $this->drupalGet('node/' . $node->id());
    $this->clickLink(t('Edit'));
    $this->assertText('Title in english');
    $this->assertText('Text in english');
    // Save the original content on second request.
    $this->drupalPostForm(NULL, NULL, t('Save and keep published (this translation)'));
    $this->assertText('Paragraphed article Title in english has been updated.');

    // Test if reverting to old paragraphs revisions works, make sure that
    // the reverted node can be saved again.
    $this->drupalGet('fr/node/' . $node->id() . '/revisions');
    $this->clickLink(t('Revert'));
    $this->drupalPostForm(NULL, ['revert_untranslated_fields' => TRUE], t('Revert'));
    $this->clickLink(t('Edit'));
    $this->assertRaw('Title in french');
    $this->assertText('Text in french');
    $this->drupalPostForm(NULL, [], t('Save and keep published (this translation)'));
    $this->assertNoRaw('The content has either been modified by another user, or you have already submitted modifications');
    $this->assertText('Text in french');

    //Add paragraphed content with untranslatable language
    $this->drupalGet('node/add/paragraphed_content_demo');
    $edit = array('langcode[0][value]' => LanguageInterface::LANGCODE_NOT_SPECIFIED);
    $this->drupalPostForm(NULL, $edit, t('Add Text + Image'));
    $this->assertResponse(200);

    // Make 'Images' paragraph field translatable, enable alt and title fields.
    $this->drupalGet('admin/structure/paragraphs_type/images/fields');
    $this->clickLink('Edit');
    $edit = [
      'translatable' => 1,
      'settings[alt_field]' => 1,
      'settings[title_field]' => 1,
    ];
    $this->drupalPostForm(NULL, $edit, t('Save settings'));

    // Create a node with an image paragraph, its alt and title text.
    $text = 'Trust me I\'m an image';
    file_put_contents('temporary://Image.jpg', $text);
    $file_path = $this->container->get('file_system')->realpath('temporary://Image.jpg');
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, [], t('Add Images'));
    $this->drupalPostForm(NULL, ['files[field_paragraphs_demo_0_subform_field_images_demo_0][]' => $file_path], t('Upload'));
    $edit = [
      'title[0][value]' => 'Title EN',
      'field_paragraphs_demo[0][subform][field_images_demo][0][alt]' => 'Image alt',
      'field_paragraphs_demo[0][subform][field_images_demo][0][title]' => 'Image title',
      'field_paragraphs_demo[0][subform][field_images_demo][0][width]' => 100,
      'field_paragraphs_demo[0][subform][field_images_demo][0][height]' => 100,
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and publish'));

    // Translate the node with the image paragraph.
    $this->clickLink('Translate');
    $this->clickLink(t('Add'), 1);
    $edit = [
      'title[0][value]' => 'Title FR',
      'field_paragraphs_demo[0][subform][field_images_demo][0][alt]' => 'Image alt FR',
      'field_paragraphs_demo[0][subform][field_images_demo][0][title]' => 'Image title FR',
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and keep published (this translation)'));
    $this->assertRaw('Title FR');

    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, [], t('Add Text'));
    $edit = [
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'texto',
      'title[0][value]' => 'titulo',
      'langcode[0][value]' => 'de',
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
    $node = $this->drupalGetNodeByTitle('titulo');
    $this->assertParagraphsLangcode($node->id(), 'de');

    // Test langcode matching when Paragraphs and node have different language.
    $paragraph_1 = Paragraph::create([
      'title' => 'Paragraph',
      'type' => 'text',
      'langcode' => 'en',
      'field_text_demo' => 'english_text_1',
    ]);
    $paragraph_1->save();

    $paragraph_2 = Paragraph::create([
      'title' => 'Paragraph',
      'type' => 'text',
      'langcode' => 'en',
      'field_text_demo' => 'english_text_2',
    ]);
    $paragraph_2->save();

    $paragraph_data = $paragraph_2->toArray();
    $paragraph_data['field_text_demo'] = 'german_text_2';
    $paragraph_2->addTranslation('de', $paragraph_data);
    $paragraph_2->save();
    $translated_paragraph = $paragraph_2->getTranslation('en');

    $node = $this->createNode([
      'langcode' => 'de',
      'type' => 'paragraphed_content_demo',
      'field_paragraphs_demo' => [$paragraph_1, $translated_paragraph],
    ]);
    $this->drupalGet('node/' . $node->id() . '/edit');
    $this->drupalPostForm(NULL, [], t('Save and keep published'));
    $this->assertText('Paragraphed article ' . $node->label() . ' has been updated.');
    // Check that first paragraph langcode has been updated.
    $paragraph = Paragraph::load($paragraph_1->id());
    $this->assertEqual($paragraph->language()->getId(), 'de');
    $this->assertFalse($paragraph->hasTranslation('en'));
    // Check that second paragraph has two translations.
    $paragraph = Paragraph::load($paragraph_2->id());
    $this->assertTrue($paragraph->hasTranslation('de'));
    $this->assertTrue($paragraph->hasTranslation('en'));
    $this->assertRaw('german_text');

    // Create an english translation of the node.
    $edit = [
      'field_paragraphs_demo[0][subform][field_text_demo][0][value]' => 'english_translation_1',
      'field_paragraphs_demo[1][subform][field_text_demo][0][value]' => 'english_translation_2',
    ];
    $this->drupalPostForm('node/' . $node->id() . '/translations/add/de/en', $edit, t('Save and keep published (this translation)'));
    // Attempt to create a french translation.
    $this->drupalGet('node/' . $node->id() . '/translations/add/de/fr');
    // Check that the german translation of the paragraphs is displayed.
    $this->assertFieldByName('field_paragraphs_demo[0][subform][field_text_demo][0][value]', 'english_text_1');
    $this->assertFieldByName('field_paragraphs_demo[1][subform][field_text_demo][0][value]', 'german_text_2');
    $this->drupalPostForm(NULL, ['source_langcode[source]' => 'en'], t('Change'));
    // Check that the english translation of the paragraphs is displayed.
    $this->assertFieldByName('field_paragraphs_demo[0][subform][field_text_demo][0][value]', 'english_translation_1');
    $this->assertFieldByName('field_paragraphs_demo[1][subform][field_text_demo][0][value]', 'english_translation_2');

    // Create a node with empty Paragraphs.
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, [], t('Add Nested Paragraph'));
    $this->drupalPostForm(NULL, ['title[0][value]' => 'empty_node'], t('Save and publish'));
    // Attempt to translate it.
    $this->clickLink(t('Translate'));
    $this->clickLink(t('Add'));
    // Check the add button is not displayed.
    $this->assertEqual(count($this->xpath('//*[@name="field_paragraphs_demo_0_subform_field_paragraphs_demo_images_add_more"]')), 0);

    // Add a non translatable field to Text Paragraph type.
    $edit = [
      'new_storage_type' => 'text_long',
      'label' => 'untranslatable_field',
      'field_name' => 'untranslatable_field',
    ];
    $this->drupalPostForm('admin/structure/paragraphs_type/text/fields/add-field', $edit, t('Save and continue'));
    $this->drupalPostForm(NULL, [], t('Save field settings'));
    $this->drupalPostForm(NULL, [], t('Save settings'));

    // Add a non translatable reference field.
    $edit = [
      'new_storage_type' => 'field_ui:entity_reference:node',
      'label' => 'untranslatable_ref_field',
      'field_name' => 'untranslatable_ref_field',
    ];
    $this->drupalPostForm('admin/structure/paragraphs_type/text/fields/add-field', $edit, t('Save and continue'));
    $this->drupalPostForm(NULL, [], t('Save field settings'));
    $this->drupalPostForm(NULL, ['settings[handler_settings][target_bundles][paragraphed_content_demo]' => TRUE], t('Save settings'));

    // Add a non translatable link field.
    $edit = [
      'new_storage_type' => 'link',
      'label' => 'untranslatable_link_field',
      'field_name' => 'untranslatable_link_field',
    ];
    $this->drupalPostForm('admin/structure/paragraphs_type/text/fields/add-field', $edit, t('Save and continue'));
    $this->drupalPostForm(NULL, [], t('Save field settings'));
    $this->drupalPostForm(NULL, [], t('Save settings'));

    // Attempt to add a translation.
    $this->drupalGet('node/' . $node->id() . '/translations/add/de/fr');
    $this->assertText('untranslatable_field (all languages)');
    $this->assertText('untranslatable_ref_field (all languages)');
    $this->assertText('untranslatable_link_field (all languages)');
    $this->assertNoText('Text (all languages)');

    // Enable translations for the reference and link field.
    $edit = [
      'translatable' => TRUE,
    ];
    $this->drupalPostForm('admin/structure/paragraphs_type/text/fields/paragraph.text.field_untranslatable_ref_field', $edit, t('Save settings'));
    $this->drupalPostForm('admin/structure/paragraphs_type/text/fields/paragraph.text.field_untranslatable_link_field', $edit, t('Save settings'));

    // Attempt to add a translation.
    $this->drupalGet('node/' . $node->id() . '/translations/add/de/fr');
    $this->assertText('untranslatable_field (all languages)');
    $this->assertNoText('untranslatable_link_field (all languages)');
    $this->assertNoText('untranslatable_ref_field (all languages)');
    $this->assertNoText('Text (all languages)');
  }

  /**
   * Tests the paragraph buttons presence in translation multilingual workflow.
   *
   * This test covers the following test cases:
   * 1) original node langcode in EN, translate in FR, change to DE.
   * 2) original node langcode in DE, change site langcode to DE, change node
   *    langcode to EN.
   */
  public function testParagraphTranslationMultilingual() {
    // Case 1: original node langcode in EN, translate in FR, change to DE.

    // Add 'Images' paragraph and check the paragraphs buttons are displayed.
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('node.paragraphed_content_demo.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('paragraph.nested_paragraph.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->drupalPostForm(NULL, NULL, t('Add Images'));
    $this->assertParagraphsButtons(1);
    // Upload an image and check the paragraphs buttons are still displayed.
    $images = $this->drupalGetTestFiles('image')[0];
    $edit = [
      'title[0][value]' => 'Title in english',
      'files[field_paragraphs_demo_0_subform_field_images_demo_0][]' => $images->uri,
    ];
    $this->drupalPostForm(NULL, $edit, t('Upload'));
    $this->assertParagraphsButtons(1);
    $this->drupalPostForm(NULL, NULL, t('Save and publish'));
    $this->assertText('Title in english');
    $node = $this->drupalGetNodeByTitle('Title in english');
    // Check the paragraph langcode is 'en'.
    $this->assertParagraphsLangcode($node->id());

    // Add french translation.
    $this->clickLink(t('Translate'));
    $this->clickLink(t('Add'), 1);
    // Make sure the host entity and its paragraphs have valid source language
    // and check that the paragraphs buttons are hidden.
    $this->assertNoParagraphsButtons(1);
    $edit = [
      'title[0][value]' => 'Title in french',
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and keep published (this translation)'));
    $this->assertParagraphsLangcode($node->id(), 'en', 'fr');
    $this->assertText('Paragraphed article Title in french has been updated.');
    $this->assertText('Title in french');
    $this->assertNoText('Title in english');
    // Check the original node and the paragraph langcode is still 'en'.
    $this->assertParagraphsLangcode($node->id());

    // Edit the french translation and upload a new image.
    $this->clickLink('Edit');
    $images = $this->drupalGetTestFiles('image')[1];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_0_subform_field_images_demo_1][]' => $images->uri,
    ], t('Upload'));
    // Check editing a translation does not affect the source langcode and
    // check that the paragraphs buttons are still hidden.
    $this->assertParagraphsLangcode($node->id(), 'en', 'fr');
    $this->assertNoParagraphsButtons(1);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published (this translation)'));
    $this->assertText('Title in french');
    $this->assertNoText('Title in english');

    // Back to the original node.
    $this->drupalGet('node/' . $node->id());
    $this->assertText('Title in english');
    $this->assertNoText('Title in french');
    // Check the original node and the paragraph langcode are still 'en' and
    // check that the paragraphs buttons are still displayed.
    $this->clickLink('Edit');
    $this->assertParagraphsLangcode($node->id());
    $this->assertParagraphsButtons(1);
    // Change the node langcode to 'german', add a 'Nested Paragraph', check
    // the paragraphs langcode are still 'en' and their buttons are displayed.
    $edit = [
      'title[0][value]' => 'Title in english (de)',
      'langcode[0][value]' => 'de',
    ];
    $this->drupalPostForm(NULL, $edit, t('Add Nested Paragraph'));
    $this->assertParagraphsLangcode($node->id());
    $this->assertParagraphsButtons(2);
    // Add an 'Images' paragraph inside the nested one, check the paragraphs
    // langcode are still 'en' and the paragraphs buttons are still displayed.
    $this->drupalPostAjaxForm(NULL, NULL, 'field_paragraphs_demo_1_subform_field_paragraphs_demo_images_add_more');
    $this->assertParagraphsLangcode($node->id());
    $this->assertParagraphsButtons(2);
    // Upload a new image, check the paragraphs langcode are still 'en' and the
    // paragraphs buttons are displayed.
    $images = $this->drupalGetTestFiles('image')[2];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_1_subform_field_paragraphs_demo_0_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsLangcode($node->id());
    $this->assertParagraphsButtons(2);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published (this translation)'));
    $this->assertText('Title in english (de)');
    $this->assertNoText('Title in french');
    // Check the original node and the paragraphs langcode are now 'de'.
    $this->assertParagraphsLangcode($node->id(), 'de');

    // Check the french translation.
    $this->drupalGet('fr/node/' . $node->id());
    $this->assertText('Title in french');
    $this->assertNoText('Title in english (de)');
    // Check editing a translation does not affect the source langcode and
    // check that the paragraphs buttons are still hidden.
    $this->clickLink('Edit');
    $this->assertParagraphsLangcode($node->id(), 'de', 'fr');
    $this->assertNoParagraphsButtons(2);

    // Case 2: original node langcode in DE, change site langcode to DE, change
    // node langcode to EN.

    // Change the site langcode to french.
    $this->drupalPostForm('admin/config/regional/language', [
      'site_default_language' => 'fr',
    ], t('Save configuration'));

    // Check the original node and its paragraphs langcode are still 'de'
    // and the paragraphs buttons are still displayed.
    $this->drupalGet('node/' . $node->id() . '/edit');
    $this->assertParagraphsLangcode($node->id(), 'de');
    $this->assertParagraphsButtons(2);

    // Go to the french translation.
    $this->drupalGet('node/' . $node->id() . '/translations');
    $this->clickLink(t('Edit'), 1);
    // Check editing a translation does not affect the source langcode and
    // check that the paragraphs buttons are still hidden.
    $this->assertParagraphsLangcode($node->id(), 'de', 'fr');
    $this->assertNoParagraphsButtons(2);
    // Upload another image.
    $images = $this->drupalGetTestFiles('image')[3];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_1_subform_field_paragraphs_demo_0_subform_field_images_demo_1][]' => $images->uri,
    ], t('Upload'));
    // Check editing a translation does not affect the source langcode and
    // check that the paragraphs buttons are still hidden.
    $this->assertParagraphsLangcode($node->id(), 'de', 'fr');
    $this->assertNoParagraphsButtons(2);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published (this translation)'));
    // Check the paragraphs langcode are still 'de' after saving the translation.
    $this->assertParagraphsLangcode($node->id(), 'de', 'fr');
    $this->assertText('Title in french');
    $this->assertNoText('Title in english (de)');

    // Back to the original node.
    $this->drupalGet('node/' . $node->id());
    $this->assertText('Title in english (de)');
    $this->assertNoText('Title in french');
    // Check the original node and the paragraphs langcode are still 'de' and
    // check that the paragraphs buttons are still displayed.
    $this->clickLink('Edit');
    $this->assertParagraphsLangcode($node->id(), 'de');
    $this->assertParagraphsButtons(2);
    // Change the node langcode back to 'english', add an 'Images' paragraph,
    // check the paragraphs langcode are still 'de' and their buttons are shown.
    $edit = [
      'title[0][value]' => 'Title in english',
      'langcode[0][value]' => 'en',
    ];
    $this->drupalPostForm(NULL, $edit, t('Add Images'));
    $this->assertParagraphsLangcode($node->id(), 'de');
    $this->assertParagraphsButtons(3);
    // Upload a new image, check the paragraphs langcode are still 'de' and the
    // paragraphs buttons are displayed.
    $images = $this->drupalGetTestFiles('image')[4];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_2_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsLangcode($node->id(), 'de');
    $this->assertParagraphsButtons(3);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published (this translation)'));
    // Check the original node and the paragraphs langcode are now 'en'.
    $this->assertParagraphsLangcode($node->id());
  }

  /**
   * Tests the paragraphs buttons presence in multilingual workflow.
   *
   * This test covers the following test cases:
   * 1) original node langcode in german, change to english.
   * 2) original node langcode in english, change to german.
   * 3) original node langcode in english, change site langcode to german,
   *   change node langcode to german.
   */
  public function testParagraphsMultilingualWorkflow() {
    // Case 1: Check the paragraphs buttons after changing the NODE language
    // (original node langcode in GERMAN, default site langcode in english).
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('node.paragraphed_content_demo.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    // Use the experimental widget.
    $form_display = EntityFormDisplay::load('paragraph.nested_paragraph.default')
      ->setComponent('field_paragraphs_demo', [
        'type' => 'paragraphs',
      ]);
    $form_display->save();
    // Create a node and check that the node langcode is 'english'.
    $this->drupalGet('node/add/paragraphed_content_demo');
    $this->assertOptionSelected('edit-langcode-0-value', 'en');
    // Change the node langcode to 'german' and add a 'Nested Paragraph'.
    $edit = [
      'title[0][value]' => 'Title in german',
      'langcode[0][value]' => 'de',
    ];
    $this->drupalPostForm(NULL, $edit, t('Add Nested Paragraph'));
    // Check that the paragraphs buttons are displayed and add an 'Images'
    // paragraph inside the nested paragraph.
    $this->assertParagraphsButtons(1);
    $this->drupalPostAjaxForm(NULL, NULL, 'field_paragraphs_demo_0_subform_field_paragraphs_demo_images_add_more');
    // Upload an image and check the paragraphs buttons are still displayed.
    $images = $this->drupalGetTestFiles('image')[0];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_0_subform_field_paragraphs_demo_0_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsButtons(1);
    $this->drupalPostForm(NULL, NULL, t('Save and publish'));
    $this->assertText('Title in german');
    $node1 = $this->getNodeByTitle('Title in german');

    // Check the paragraph langcode is 'de' and its buttons are displayed.
    // @todo check for the nested children paragraphs buttons and langcode
    // when it's supported.
    $this->clickLink(t('Edit'));
    $this->assertParagraphsLangcode($node1->id(), 'de');
    $this->assertParagraphsButtons(1);
    // Change the node langcode to 'english' and upload another image.
    $images = $this->drupalGetTestFiles('image')[1];
    $edit = [
      'title[0][value]' => 'Title in german (en)',
      'langcode[0][value]' => 'en',
      'files[field_paragraphs_demo_0_subform_field_paragraphs_demo_0_subform_field_images_demo_1][]' => $images->uri,
    ];
    $this->drupalPostForm(NULL, $edit, t('Upload'));
    // Check the paragraph langcode is still 'de' and its buttons are shown.
    $this->assertParagraphsLangcode($node1->id(), 'de');
    $this->assertParagraphsButtons(1);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published'));
    // Check the paragraph langcode is now 'en' after saving.
    $this->assertParagraphsLangcode($node1->id());

    // Check the paragraph langcode is 'en' and its buttons are still shown.
    $this->clickLink(t('Edit'));
    $this->assertParagraphsLangcode($node1->id());
    $this->assertParagraphsButtons(1);

    // Case 2: Check the paragraphs buttons after changing the NODE language
    // (original node langcode in ENGLISH, default site langcode in english).

    // Create another node.
    $this->drupalGet('node/add/paragraphed_content_demo');
    // Check that the node langcode is 'english' and add a 'Nested Paragraph'.
    $this->assertOptionSelected('edit-langcode-0-value', 'en');
    $this->drupalPostForm(NULL, NULL, t('Add Nested Paragraph'));
    // Check that the paragraphs buttons are displayed and add an 'Images'
    // paragraph inside the nested paragraph.
    $this->assertParagraphsButtons(1);
    $this->drupalPostAjaxForm(NULL, NULL, 'field_paragraphs_demo_0_subform_field_paragraphs_demo_images_add_more');
    // Upload an image and check the paragraphs buttons are still displayed.
    $images = $this->drupalGetTestFiles('image')[0];
    $edit = [
      'title[0][value]' => 'Title in english',
      'files[field_paragraphs_demo_0_subform_field_paragraphs_demo_0_subform_field_images_demo_0][]' => $images->uri,
    ];
    $this->drupalPostForm(NULL, $edit, t('Upload'));
    $this->assertParagraphsButtons(1);
    $this->drupalPostForm(NULL, NULL, t('Save and publish'));
    $this->assertText('Title in english');
    $node2 = $this->drupalGetNodeByTitle('Title in english');

    // Check the paragraph langcode is 'en' and its buttons are displayed.
    // @todo check for the nested children paragraphs buttons and langcode
    // when it's supported.
    $this->clickLink(t('Edit'));
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(1);
    // Change the node langcode to 'german' and add another 'Images' paragraph.
    $edit = [
      'title[0][value]' => 'Title in english (de)',
      'langcode[0][value]' => 'de',
    ];
    $this->drupalPostForm(NULL, $edit, t('Add Images'));
    // Check the paragraphs langcode are still 'en' and their buttons are shown.
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(2);
    // Upload an image, check the paragraphs langcode are still 'en' and their
    // buttons are displayed.
    $images = $this->drupalGetTestFiles('image')[1];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_1_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(2);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published'));
    // Check the paragraphs langcode are now 'de' after saving.
    $this->assertParagraphsLangcode($node2->id(), 'de');

    // Change node langcode back to 'english' and save.
    $this->clickLink(t('Edit'));
    $edit = [
      'title[0][value]' => 'Title in english',
      'langcode[0][value]' => 'en',
    ];
    $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
    // Check the paragraphs langcode are now 'en' after saving.
    $this->assertParagraphsLangcode($node2->id());

    // Case 3: Check the paragraphs buttons after changing the SITE language.

    // Change the site langcode to german.
    $edit = [
      'site_default_language' => 'de',
    ];
    $this->drupalPostForm('admin/config/regional/language', $edit, t('Save configuration'));

    // Check the original node and the paragraphs langcode are still 'en' and
    // check that the paragraphs buttons are still displayed.
    $this->drupalGet('node/' . $node2->id() . '/edit');
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(2);
    // Add another 'Images' paragraph with node langcode as 'english'.
    $this->drupalPostForm(NULL, NULL, t('Add Images'));
    // Check the paragraph langcode are still 'en' and their buttons are shown.
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(3);
    // Upload an image, check the paragraphs langcode are still 'en' and their
    // buttons are displayed.
    $images = $this->drupalGetTestFiles('image')[2];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_2_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(3);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published'));
    // Check the paragraphs langcode are still 'en' after saving.
    $this->assertParagraphsLangcode($node2->id());

    // Check the paragraphs langcode are still 'en' and their buttons are shown.
    $this->clickLink(t('Edit'));
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(3);
    // Change node langcode to 'german' and add another 'Images' paragraph.
    $edit = [
      'title[0][value]' => 'Title in english (de)',
      'langcode[0][value]' => 'de',
    ];
    $this->drupalPostForm(NULL, $edit, t('Add Images'));
    // Check the paragraphs langcode are still 'en' and their buttons are shown.
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(4);
    // Upload an image, check the paragraphs langcode are still 'en' and their
    // buttons are displayed.
    $images = $this->drupalGetTestFiles('image')[3];
    $this->drupalPostForm(NULL, [
      'files[field_paragraphs_demo_3_subform_field_images_demo_0][]' => $images->uri,
    ], t('Upload'));
    $this->assertParagraphsLangcode($node2->id());
    $this->assertParagraphsButtons(4);
    $this->drupalPostForm(NULL, NULL, t('Save and keep published'));
    // Check the paragraphs langcode are now 'de' after saving.
    $this->assertParagraphsLangcode($node2->id(), 'de');
  }

  /**
   * Passes if the paragraphs buttons are present.
   *
   * @param int $count
   *   Number of paragraphs buttons to look for.
   */
  protected function assertParagraphsButtons($count) {
    $this->assertParagraphsButtonsHelper($count, FALSE);
  }

  /**
   * Passes if the paragraphs buttons are NOT present.
   *
   * @param int $count
   *   Number of paragraphs buttons to look for.
   */
  protected function assertNoParagraphsButtons($count) {
    $this->assertParagraphsButtonsHelper($count, TRUE);
  }

  /**
   * Helper for assertParagraphsButtons and assertNoParagraphsButtons.
   *
   * @param int $count
   *   Number of paragraphs buttons to look for.
   * @param bool $hidden
   *   TRUE if these buttons should not be shown, FALSE otherwise.
   *   Defaults to TRUE.
   */
  protected function assertParagraphsButtonsHelper($count, $hidden = TRUE) {
    for ($i = 0; $i < $count; $i++) {
      $remove_button = $this->xpath('//*[@name="field_paragraphs_demo_' . $i . '_remove"]');
      if (!$hidden) {
        $this->assertNotEqual(count($remove_button), 0);
      }
      else {
        $this->assertEqual(count($remove_button), 0);
      }
    }

    // It is enough to check for the specific paragraph type 'Images' to assert
    // the add more buttons presence for this test class.
    $add_button = $this->xpath('//input[@value="Add Images"]');
    if (!$hidden) {
      $this->assertNotEqual(count($add_button), 0);
    }
    else {
      $this->assertEqual(count($add_button), 0);
    }
  }

  /**
   * Assert each paragraph items have the same langcode as the node one.
   *
   * @param string $node_id
   *   The node ID which contains the paragraph items to be checked.
   * @param string $source_lang
   *   The expected node source langcode. Defaults to 'en'.
   * @param string $trans_lang
   *   The expected translated node langcode. Defaults to NULL.
   */
  protected function assertParagraphsLangcode($node_id, $source_lang = 'en', $trans_lang = NULL) {
    // Update the outdated node and check all the paragraph items langcodes.
    \Drupal::entityTypeManager()->getStorage('node')->resetCache([$node_id]);
    /** @var \Drupal\node\NodeInterface $node */
    $node = Node::load($node_id);
    $node_langcode = $node->langcode->value;
    $this->assertEqual($node_langcode, $source_lang, 'Host langcode matches.');

    /** @var \Drupal\Core\Entity\ContentEntityBase $paragraph */
    foreach ($node->field_paragraphs_demo->referencedEntities() as $paragraph) {
      $paragraph_langcode = $paragraph->language()->getId();
      $message = new FormattableMarkup('Node langcode is "@node", paragraph item langcode is "@item".', ['@node' => $source_lang, '@item' => $paragraph_langcode]);
      $this->assertEqual($paragraph_langcode, $source_lang, $message);
    }

    // Check the translation.
    if (!empty($trans_lang)) {
      $this->assertTrue($node->hasTranslation($trans_lang), 'Translation exists.');
    }
    if ($node->hasTranslation($trans_lang)) {
      $trans_node = $node->getTranslation($trans_lang);
      $trans_node_langcode = $trans_node->language()->getId();
      $this->assertEqual($trans_node_langcode, $trans_lang, 'Translated node langcode matches.');

      // Check the paragraph item langcode matching the translated node langcode.
      foreach ($trans_node->field_paragraphs_demo->referencedEntities() as $paragraph) {
        if ($paragraph->hasTranslation($trans_lang)) {
          $trans_item = $paragraph->getTranslation($trans_lang);
          $paragraph_langcode = $trans_item->language()->getId();
          $message = new FormattableMarkup('Translated node langcode is "@node", paragraph item langcode is "@item".', ['@node' => $trans_lang, '@item' => $paragraph_langcode]);
          $this->assertEqual($paragraph_langcode, $trans_lang, $message);
        }
      }
    }
  }
}