class TrackChangesTest

class TrackChangesTest extends MigrateTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'user',
        'taxonomy',
        'migrate',
        'migrate_track_changes_test',
        'text',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create source test table.
        $this->sourceDatabase
            ->schema()
            ->createTable('track_changes_term', [
            'fields' => [
                'tid' => [
                    'description' => 'Serial',
                    'type' => 'serial',
                    'unsigned' => TRUE,
                    'not null' => TRUE,
                ],
                'name' => [
                    'description' => 'Name',
                    'type' => 'varchar',
                    'length' => 128,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'description' => [
                    'description' => 'Name',
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => FALSE,
                    'default' => '',
                ],
            ],
            'primary key' => [
                'tid',
            ],
            'description' => 'Contains taxonomy terms to import',
        ]);
        // Add 4 items to source table.
        $this->sourceDatabase
            ->insert('track_changes_term')
            ->fields([
            'name',
            'description',
        ])
            ->values([
            'name' => 'Item 1',
            'description' => 'Text item 1',
        ])
            ->values([
            'name' => 'Item 2',
            'description' => 'Text item 2',
        ])
            ->values([
            'name' => 'Item 3',
            'description' => 'Text item 3',
        ])
            ->values([
            'name' => 'Item 4',
            'description' => 'Text item 4',
        ])
            ->execute();
        $this->installEntitySchema('taxonomy_term');
        $this->installEntitySchema('user');
        $this->executeMigration('track_changes_test');
    }
    
    /**
     * Tests track changes property of SqlBase.
     */
    public function testTrackChanges() {
        // Assert all of the terms have been imported.
        $this->assertTermExists('name', 'Item 1');
        $this->assertTermExists('name', 'Item 2');
        $this->assertTermExists('description', 'Text item 3');
        $this->assertTermExists('description', 'Text item 4');
        // Save the original hash, rerun the migration and check that the hashes
        // are the same.
        $id_map = $this->migration
            ->getIdMap();
        for ($i = 1; $i < 5; $i++) {
            $row = $id_map->getRowBySource([
                'tid' => $i,
            ]);
            $original_hash[$i] = $row['hash'];
        }
        $this->executeMigration($this->migration);
        for ($i = 1; $i < 5; $i++) {
            $row = $id_map->getRowBySource([
                'tid' => $i,
            ]);
            $new_hash[$i] = $row['hash'];
        }
        $this->assertEquals($original_hash, $new_hash);
        // Update Item 1 triggering its track_changes by name.
        $this->sourceDatabase
            ->update('track_changes_term')
            ->fields([
            'name' => 'Item 1 updated',
        ])
            ->condition('name', 'Item 1')
            ->execute();
        // Update Item 2 keeping it's track_changes name the same.
        $this->sourceDatabase
            ->update('track_changes_term')
            ->fields([
            'name' => 'Item 2',
        ])
            ->condition('name', 'Item 2')
            ->execute();
        // Update Item 3 triggering its track_changes by field.
        $this->sourceDatabase
            ->update('track_changes_term')
            ->fields([
            'description' => 'Text item 3 updated',
        ])
            ->condition('name', 'Item 3')
            ->execute();
        // Update Item 2 keeping it's track_changes field the same.
        $this->sourceDatabase
            ->update('track_changes_term')
            ->fields([
            'description' => 'Text item 4',
        ])
            ->condition('name', 'Item 4')
            ->execute();
        // Execute migration again.
        $this->executeMigration($this->migration);
        // Check that the all the hashes except for 'Item 2'and 'Item 4' have
        // changed.
        for ($i = 1; $i < 5; $i++) {
            $row = $id_map->getRowBySource([
                'tid' => $i,
            ]);
            $new_hash[$i] = $row['hash'];
        }
        $this->assertNotEquals($original_hash[1], $new_hash[1]);
        $this->assertEquals($original_hash[2], $new_hash[2]);
        $this->assertNotEquals($original_hash[3], $new_hash[3]);
        $this->assertEquals($original_hash[4], $new_hash[4]);
        // Item with name changes should be updated.
        $this->assertTermExists('name', 'Item 1 updated');
        $this->assertTermDoesNotExist('name', 'Item 1');
        // Item without name changes should not be updated.
        $this->assertTermExists('name', 'Item 2');
        // Item with field changes should be updated.
        $this->assertTermExists('description', 'Text item 3 updated');
        $this->assertTermDoesNotExist('description', 'Text item 3');
        // Item without field changes should not be updated.
        $this->assertTermExists('description', 'Text item 4');
        // Test hashes again after forcing all rows to be re-imported.
        $id_map->prepareUpdate();
        // Execute migration again.
        $this->executeMigration('track_changes_test');
        for ($i = 1; $i < 5; $i++) {
            $row = $id_map->getRowBySource([
                'tid' => $i,
            ]);
            $newer_hash[$i] = $row['hash'];
        }
        $this->assertEquals($new_hash[1], $newer_hash[1]);
        $this->assertEquals($new_hash[2], $newer_hash[2]);
        $this->assertEquals($new_hash[3], $newer_hash[3]);
        $this->assertEquals($new_hash[4], $newer_hash[4]);
    }
    
    /**
     * Assert that term with given name exists.
     *
     * @param string $property
     *   Property to evaluate.
     * @param string $value
     *   Value to evaluate.
     *
     * @internal
     */
    protected function assertTermExists(string $property, string $value) : void {
        self::assertTrue($this->termExists($property, $value));
    }
    
    /**
     * Assert that term with given title does not exist.
     *
     * @param string $property
     *   Property to evaluate.
     * @param string $value
     *   Value to evaluate.
     *
     * @internal
     */
    protected function assertTermDoesNotExist(string $property, string $value) : void {
        self::assertFalse($this->termExists($property, $value));
    }
    
    /**
     * Checks if term with given name exists.
     *
     * @param string $property
     *   Property to evaluate.
     * @param string $value
     *   Value to evaluate.
     *
     * @return bool
     */
    protected function termExists($property, $value) {
        $property = $property === 'description' ? 'description__value' : $property;
        $query = \Drupal::entityQuery('taxonomy_term')->accessCheck(FALSE);
        $result = $query->condition($property, $value)
            ->range(0, 1)
            ->execute();
        return !empty($result);
    }

}