class TermParentsTest

class TermParentsTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'taxonomy_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The term storage.
     *
     * @var \Drupal\taxonomy\TermStorageInterface
     */
    protected $termStorage;
    
    /**
     * The state service.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $state;
    
    /**
     * The ID of the vocabulary used in this test.
     *
     * @var string
     */
    protected $vocabularyId = 'test_vocabulary';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        
        /** @var \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager */
        $entity_type_manager = $this->container
            ->get('entity_type.manager');
        $this->termStorage = $entity_type_manager->getStorage('taxonomy_term');
        $this->state = $this->container
            ->get('state');
        Vocabulary::create([
            'vid' => $this->vocabularyId,
            'name' => 'Test',
        ])
            ->save();
        $this->drupalLogin($this->drupalCreateUser([
            'administer taxonomy',
        ]));
    }
    
    /**
     * Tests specifying parents when creating terms.
     */
    public function testAddWithParents() : void {
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add");
        $page = $this->getSession()
            ->getPage();
        // Create a term without any parents.
        $term_1 = $this->submitAddTermForm('Test term 1');
        $expected = [
            [
                'target_id' => 0,
            ],
        ];
        $this->assertEquals($expected, $term_1->get('parent')
            ->getValue());
        // Explicitly selecting <root> should have the same effect as not selecting
        // anything.
        $page->selectFieldOption('Parent terms', '<root>');
        $term_2 = $this->submitAddTermForm('Test term 2');
        $this->assertEquals($expected, $term_2->get('parent')
            ->getValue());
        // Create two terms with the previously created ones as parents,
        // respectively.
        $page->selectFieldOption('Parent terms', 'Test term 1');
        $term_3 = $this->submitAddTermForm('Test term 3');
        $expected = [
            [
                'target_id' => $term_1->id(),
            ],
        ];
        $this->assertEquals($expected, $term_3->get('parent')
            ->getValue());
        $page->selectFieldOption('Parent terms', 'Test term 2');
        $term_4 = $this->submitAddTermForm('Test term 4');
        $expected = [
            [
                'target_id' => $term_2->id(),
            ],
        ];
        $this->assertEquals($expected, $term_4->get('parent')
            ->getValue());
        // Create a term with term 3 as parent.
        $page->selectFieldOption('Parent terms', '-Test term 3');
        $term_5 = $this->submitAddTermForm('Test term 5');
        $expected = [
            [
                'target_id' => $term_3->id(),
            ],
        ];
        $this->assertEquals($expected, $term_5->get('parent')
            ->getValue());
        // Create a term with multiple parents.
        $page->selectFieldOption('Parent terms', '--Test term 5');
        $page->selectFieldOption('Parent terms', '-Test term 4', TRUE);
        $term_6 = $this->submitAddTermForm('Test term 6');
        $expected = [
            [
                'target_id' => $term_5->id(),
            ],
            [
                'target_id' => $term_4->id(),
            ],
        ];
        $this->assertEquals($expected, $term_6->get('parent')
            ->getValue());
    }
    
    /**
     * Creates a term through the user interface and returns it.
     *
     * @param string $name
     *   The name of the term to create.
     *
     * @return \Drupal\taxonomy\TermInterface
     *   The newly created taxonomy term.
     */
    protected function submitAddTermForm($name) {
        $this->getSession()
            ->getPage()
            ->fillField('Name', $name);
        $this->submitForm([], 'Save');
        $result = $this->termStorage
            ->getQuery()
            ->accessCheck(FALSE)
            ->condition('name', $name)
            ->execute();
        
        /** @var \Drupal\taxonomy\TermInterface $term_1 */
        $term_1 = $this->termStorage
            ->load(reset($result));
        $this->assertInstanceOf(TermInterface::class, $term_1);
        return $term_1;
    }
    
    /**
     * Tests editing the parents of existing terms.
     */
    public function testEditingParents() : void {
        $terms = $this->doTestEditingSingleParent();
        $term_5 = array_pop($terms);
        $term_4 = array_pop($terms);
        // Create a term with multiple parents.
        $term_6 = $this->createTerm('Test term 6', [
            // Term 5 comes before term 4 in the user interface, so add the parents in
            // the matching order.
$term_5->id(),
            $term_4->id(),
        ]);
        $this->drupalGet($term_6->toUrl('edit-form'));
        $this->assertParentOption('<root>');
        $this->assertParentOption('Test term 1');
        $this->assertParentOption('-Test term 3');
        $this->assertParentOption('--Test term 5', TRUE);
        $this->assertParentOption('Test term 2');
        $this->assertParentOption('-Test term 4', TRUE);
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_6);
    }
    
    /**
     * Tests specifying parents when creating terms and a disabled parent form.
     */
    public function testEditingParentsWithDisabledFormElement() : void {
        // Disable the parent form element.
        $this->state
            ->set('taxonomy_test.disable_parent_form_element', TRUE);
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add");
        $this->assertSession()
            ->fieldDisabled('Parent terms');
        $terms = $this->doTestEditingSingleParent();
        $term_5 = array_pop($terms);
        $term_4 = array_pop($terms);
        // Create a term with multiple parents.
        $term_6 = $this->createTerm('Test term 6', [
            // When the parent form element is disabled, its default value is used as
            // the value which gets populated in ascending order of term IDs.
$term_4->id(),
            $term_5->id(),
        ]);
        $this->drupalGet($term_6->toUrl('edit-form'));
        $this->assertParentOption('<root>');
        $this->assertParentOption('Test term 1');
        $this->assertParentOption('-Test term 3');
        $this->assertParentOption('--Test term 5', TRUE);
        $this->assertParentOption('Test term 2');
        $this->assertParentOption('-Test term 4', TRUE);
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_6);
    }
    
    /**
     * Performs tests that edit terms with a single parent.
     *
     * @return \Drupal\taxonomy\TermInterface[]
     *   A list of terms created for testing.
     */
    protected function doTestEditingSingleParent() {
        $terms = [];
        // Create two terms without any parents.
        $term_1 = $this->createTerm('Test term 1');
        $this->drupalGet($term_1->toUrl('edit-form'));
        $this->assertParentOption('<root>', TRUE);
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_1);
        $terms[] = $term_1;
        $term_2 = $this->createTerm('Test term 2');
        $this->drupalGet($term_2->toUrl('edit-form'));
        $this->assertParentOption('<root>', TRUE);
        $this->assertParentOption('Test term 1');
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_2);
        $terms[] = $term_2;
        // Create two terms with the previously created terms as parents,
        // respectively.
        $term_3 = $this->createTerm('Test term 3', [
            $term_1->id(),
        ]);
        $this->drupalGet($term_3->toUrl('edit-form'));
        $this->assertParentOption('<root>');
        $this->assertParentOption('Test term 1', TRUE);
        $this->assertParentOption('Test term 2');
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_3);
        $terms[] = $term_3;
        $term_4 = $this->createTerm('Test term 4', [
            $term_2->id(),
        ]);
        $this->drupalGet($term_4->toUrl('edit-form'));
        $this->assertParentOption('<root>');
        $this->assertParentOption('Test term 1');
        $this->assertParentOption('-Test term 3');
        $this->assertParentOption('Test term 2', TRUE);
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_4);
        $terms[] = $term_4;
        // Create a term with term 3 as parent.
        $term_5 = $this->createTerm('Test term 5', [
            $term_3->id(),
        ]);
        $this->drupalGet($term_5->toUrl('edit-form'));
        $this->assertParentOption('<root>');
        $this->assertParentOption('Test term 1');
        $this->assertParentOption('-Test term 3', TRUE);
        $this->assertParentOption('Test term 2');
        $this->assertParentOption('-Test term 4');
        $this->submitForm([], 'Save');
        $this->assertParentsUnchanged($term_5);
        $terms[] = $term_5;
        return $terms;
    }
    
    /**
     * Test the term add/edit form with parent query parameter.
     */
    public function testParentFromQuery() : void {
        // Create three terms without any parents.
        $term_1 = $this->createTerm('Test term 1');
        $term_2 = $this->createTerm('Test term 2');
        $term_3 = $this->createTerm('Test term 3');
        // Add term form with one parent.
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add", [
            'query' => [
                'parent' => $term_1->id(),
            ],
        ]);
        $this->assertParentOption('Test term 1', TRUE);
        $this->assertParentOption('Test term 2', FALSE);
        $this->assertParentOption('Test term 3', FALSE);
        // Add term form with two parents.
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add", [
            'query' => [
                'parent[0]' => $term_1->id(),
                'parent[1]' => $term_2->id(),
            ],
        ]);
        $this->assertParentOption('Test term 1', TRUE);
        $this->assertParentOption('Test term 2', TRUE);
        $this->assertParentOption('Test term 3', FALSE);
        // Add term form with no parents.
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add", [
            'query' => [
                'parent' => '',
            ],
        ]);
        $this->assertParentOption('Test term 1', FALSE);
        $this->assertParentOption('Test term 2', FALSE);
        $this->assertParentOption('Test term 3', FALSE);
        // Add term form with invalid parent.
        $this->drupalGet("/admin/structure/taxonomy/manage/{$this->vocabularyId}/add", [
            'query' => [
                'parent' => -1,
            ],
        ]);
        $this->assertParentOption('Test term 1', FALSE);
        $this->assertParentOption('Test term 2', FALSE);
        $this->assertParentOption('Test term 3', FALSE);
        // Edit term form with one parent.
        $this->drupalGet($term_1->toUrl('edit-form'), [
            'query' => [
                'parent' => $term_2->id(),
            ],
        ]);
        $this->assertParentOption('Test term 2', TRUE);
        $this->assertParentOption('Test term 3', FALSE);
        // Edit term form with two parents.
        $this->drupalGet($term_1->toUrl('edit-form'), [
            'query' => [
                'parent[0]' => $term_2->id(),
                'parent[1]' => $term_3->id(),
            ],
        ]);
        $this->assertParentOption('Test term 2', TRUE);
        $this->assertParentOption('Test term 3', TRUE);
        // Edit term form with no parents.
        $this->drupalGet($term_1->toUrl('edit-form'), [
            'query' => [
                'parent' => '',
            ],
        ]);
        $this->assertParentOption('Test term 2', FALSE);
        $this->assertParentOption('Test term 3', FALSE);
        // Edit term form with invalid parent.
        $this->drupalGet($term_1->toUrl('edit-form'), [
            'query' => [
                'parent' => -1,
            ],
        ]);
        $this->assertParentOption('Test term 2', FALSE);
        $this->assertParentOption('Test term 3', FALSE);
    }
    
    /**
     * Creates a term, saves it and returns it.
     *
     * @param string $name
     *   The name of the term to create
     * @param int[] $parent_ids
     *   (optional) A list of parent term IDs.
     *
     * @return \Drupal\taxonomy\TermInterface
     *   The created term.
     */
    protected function createTerm($name, array $parent_ids = []) {
        
        /** @var \Drupal\taxonomy\TermInterface $term */
        $term = $this->termStorage
            ->create([
            'name' => $name,
            'vid' => $this->vocabularyId,
        ]);
        foreach ($parent_ids as $delta => $parent_id) {
            $term->get('parent')
                ->set($delta, [
                'target_id' => $parent_id,
            ]);
        }
        $term->save();
        return $term;
    }
    
    /**
     * Asserts that an option in the parent form element of terms exists.
     *
     * @param string $option
     *   The label of the parent option.
     * @param bool $selected
     *   (optional) Whether or not the option should be selected. Defaults to
     *   FALSE.
     *
     * @internal
     */
    protected function assertParentOption(string $option, bool $selected = FALSE) : void {
        $option = $this->assertSession()
            ->optionExists('Parent terms', $option);
        if ($selected) {
            $this->assertTrue($option->hasAttribute('selected'));
        }
        else {
            $this->assertFalse($option->hasAttribute('selected'));
        }
    }
    
    /**
     * Asserts that the parents of the term have not changed after saving.
     *
     * @param \Drupal\taxonomy\TermInterface $term
     *   The term to check.
     *
     * @internal
     */
    protected function assertParentsUnchanged(TermInterface $term) : void {
        $saved_term = $this->termStorage
            ->load($term->id());
        $expected = $term->get('parent')
            ->getValue();
        $this->assertEquals($expected, $saved_term->get('parent')
            ->getValue());
    }

}