class MigrateUpgradeTestBase

abstract class MigrateUpgradeTestBase extends BrowserTestBase {
    use MigrationConfigurationTrait;
    
    /**
     * Use the Standard profile to test help implementations of many core modules.
     *
     * @var string
     */
    protected $profile = 'standard';
    
    /**
     * The source database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $sourceDatabase;
    
    /**
     * The destination site major version.
     *
     * @var string
     */
    protected $destinationSiteVersion;
    
    /**
     * Input data for the credential form.
     *
     * @var array
     */
    protected $edits;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->createMigrationConnection();
        $this->sourceDatabase = Database::getConnection('default', 'migrate_drupal_ui');
        // Get the current major version.
        [
            $this->destinationSiteVersion,
        ] = explode('.', \Drupal::VERSION, 2);
        // Log in as user 1. Migrations in the UI can only be performed as user 1.
        $this->drupalLogin($this->rootUser);
    }
    
    /**
     * Navigates to the credential form and submits valid credentials.
     */
    public function submitCredentialForm() {
        $this->drupalGet('/upgrade');
        $this->submitForm([], 'Continue');
        // Get valid credentials.
        $this->edits = $this->translatePostValues($this->getCredentials());
        // When the Credential form is submitted the migrate map tables are created.
        $this->submitForm($this->edits, 'Review upgrade');
    }
    
    /**
     * Loads a database fixture into the source database connection.
     *
     * @param string $path
     *   Path to the dump file.
     */
    protected function loadFixture($path) {
        $default_db = Database::getConnection()->getKey();
        Database::setActiveConnection($this->sourceDatabase
            ->getKey());
        if (substr($path, -3) == '.gz') {
            $path = 'compress.zlib://' . $path;
        }
        require $path;
        Database::setActiveConnection($default_db);
    }
    
    /**
     * Changes the database connection to the prefixed one.
     *
     * @todo Remove when we don't use global. https://www.drupal.org/node/2552791
     */
    protected function createMigrationConnection() {
        $connection_info = Database::getConnectionInfo('default')['default'];
        if ($connection_info['driver'] === 'sqlite') {
            // Create database file in the test site's public file directory so that
            // \Drupal\simpletest\TestBase::restoreEnvironment() will delete this once
            // the test is complete.
            $file = $this->publicFilesDirectory . '/' . $this->testId . '-migrate.db.sqlite';
            touch($file);
            $connection_info['database'] = $file;
            $connection_info['prefix'] = '';
        }
        else {
            $prefix = $connection_info['prefix'];
            // Simpletest uses fixed length prefixes. Create a new prefix for the
            // source database. Adding to the end of the prefix ensures that
            // \Drupal\simpletest\TestBase::restoreEnvironment() will remove the
            // additional tables.
            $connection_info['prefix'] = $prefix . '0';
        }
        Database::addConnectionInfo('migrate_drupal_ui', 'default', $connection_info);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function tearDown() {
        Database::removeConnection('migrate_drupal_ui');
        parent::tearDown();
    }
    
    /**
     * Gets the source base path for the concrete test.
     *
     * @return string
     *   The source base path.
     */
    protected abstract function getSourceBasePath();
    
    /**
     * Gets the expected number of entities per entity type after migration.
     *
     * @return int[]
     *   An array of expected counts keyed by entity type ID.
     */
    protected abstract function getEntityCounts();
    
    /**
     * Gets the available upgrade paths.
     *
     * @return string[]
     *   An array of available upgrade paths.
     */
    protected abstract function getAvailablePaths();
    
    /**
     * Gets the missing upgrade paths.
     *
     * @return string[]
     *   An array of missing upgrade paths.
     */
    protected abstract function getMissingPaths();
    
    /**
     * Gets expected number of entities per entity after incremental migration.
     *
     * @return int[]
     *   An array of expected counts keyed by entity type ID.
     */
    protected abstract function getEntityCountsIncremental();
    
    /**
     * Helper method that asserts text on the ID conflict form.
     *
     * @param array $entity_types
     *   An array of entity types.
     *
     * @throws \Behat\Mink\Exception\ResponseTextException
     * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
     */
    protected function assertIdConflictForm(array $entity_types) {
        $session = $this->assertSession();
        
        /** @var \Drupal\Core\Entity\EntityTypeManager $entity_type_manager */
        $entity_type_manager = \Drupal::service('entity_type.manager');
        $session->pageTextContains('WARNING: Content may be overwritten on your new site.');
        $session->pageTextContains('There is conflicting content of these types:');
        $this->assertNotEmpty($entity_types);
        foreach ($entity_types as $entity_type) {
            $label = $entity_type_manager->getDefinition($entity_type)
                ->getPluralLabel();
            $session->pageTextContains($label);
        }
        $session->pageTextContainsOnce('content items');
        $session->pageTextContains('There is translated content of these types:');
    }
    
    /**
     * Helper to assert content on the Review form.
     *
     * @param array|null $available_paths
     *   An array of modules that will be upgraded. Defaults to
     *   $this->getAvailablePaths().
     * @param array|null $missing_paths
     *   An array of modules that will not be upgraded. Defaults to
     *   $this->getMissingPaths().
     *
     * @throws \Behat\Mink\Exception\ExpectationException
     */
    protected function assertReviewForm(array $available_paths = NULL, array $missing_paths = NULL) {
        $session = $this->assertSession();
        $session->pageTextContains('What will be upgraded?');
        $available_paths = $available_paths ?? $this->getAvailablePaths();
        $missing_paths = $missing_paths ?? $this->getMissingPaths();
        // Test the available migration paths.
        foreach ($available_paths as $available) {
            $session->elementExists('xpath', "//td[contains(@class, 'checked') and text() = '{$available}']");
            $session->elementNotExists('xpath', "//td[contains(@class, 'error') and text() = '{$available}']");
        }
        // Test the missing migration paths.
        foreach ($missing_paths as $missing) {
            $session->elementExists('xpath', "//td[contains(@class, 'error') and text() = '{$missing}']");
            $session->elementNotExists('xpath', "//td[contains(@class, 'checked') and text() = '{$missing}']");
        }
        // Test the total count of missing and available paths.
        $session->elementsCount('xpath', "//td[contains(@class, 'upgrade-analysis-report__status-icon--error')]", count($missing_paths));
        $session->elementsCount('xpath', "//td[contains(@class, 'upgrade-analysis-report__status-icon--checked')]", count($available_paths));
    }
    
    /**
     * Asserts the upgrade completed successfully.
     *
     * @param array $entity_counts
     *   An array of entity count, where the key is the entity type and the value
     *   is the number of the entities that should exist post migration.
     *
     * @throws \Behat\Mink\Exception\ExpectationException
     */
    protected function assertUpgrade(array $entity_counts) {
        $session = $this->assertSession();
        $session->pageTextContains(t('Congratulations, you upgraded Drupal!'));
        // Assert the count of entities after the upgrade. First, reset all the
        // statics after migration to ensure entities are loadable.
        $this->resetAll();
        // Check that the expected number of entities is the same as the actual
        // number of entities.
        $entity_definitions = array_keys(\Drupal::entityTypeManager()->getDefinitions());
        ksort($entity_counts);
        $expected_count_keys = array_keys($entity_counts);
        sort($entity_definitions);
        $this->assertSame($expected_count_keys, $entity_definitions);
        // Assert the correct number of entities exists.
        $actual_entity_counts = [];
        foreach ($entity_definitions as $entity_type) {
            $actual_entity_counts[$entity_type] = (int) \Drupal::entityQuery($entity_type)->accessCheck(FALSE)
                ->count()
                ->execute();
        }
        $this->assertSame($entity_counts, $actual_entity_counts);
        $plugin_manager = \Drupal::service('plugin.manager.migration');
        $version = $this->getLegacyDrupalVersion($this->sourceDatabase);
        
        /** @var \Drupal\migrate\Plugin\Migration[] $all_migrations */
        $all_migrations = $plugin_manager->createInstancesByTag('Drupal ' . $version);
        foreach ($all_migrations as $migration) {
            $id_map = $migration->getIdMap();
            foreach ($id_map as $source_id => $map) {
                // Convert $source_id into a keyless array so that
                // \Drupal\migrate\Plugin\migrate\id_map\Sql::getSourceHash() works as
                // expected.
                $source_id_values = array_values(unserialize($source_id));
                $row = $id_map->getRowBySource($source_id_values);
                $destination = serialize($id_map->currentDestination());
                $message = "Migration of {$source_id} to {$destination} as part of the {$migration->id()} migration. The source row status is " . $row['source_row_status'];
                // A completed migration should have maps with
                // MigrateIdMapInterface::STATUS_IGNORED or
                // MigrateIdMapInterface::STATUS_IMPORTED.
                $this->assertNotSame(MigrateIdMapInterface::STATUS_FAILED, $row['source_row_status'], $message);
                $this->assertNotSame(MigrateIdMapInterface::STATUS_NEEDS_UPDATE, $row['source_row_status'], $message);
            }
        }
    }
    
    /**
     * Creates an array of credentials for the Credential form.
     *
     * Before submitting to the Credential form the array must be processed by
     * BrowserTestBase::translatePostValues() before submitting.
     *
     * @return array
     *   An array of values suitable for BrowserTestBase::translatePostValues().
     *
     * @see \Drupal\migrate_drupal_ui\Form\CredentialForm
     */
    protected function getCredentials() {
        $connection_options = $this->sourceDatabase
            ->getConnectionOptions();
        $version = $this->getLegacyDrupalVersion($this->sourceDatabase);
        $driver = $connection_options['driver'];
        // Use the driver connection form to get the correct options out of the
        // database settings. This supports all of the databases we test against.
        $drivers = drupal_get_database_types();
        $form = $drivers[$driver]->getFormOptions($connection_options);
        $connection_options = array_intersect_key($connection_options, $form + $form['advanced_options']);
        $edit = [
            $driver => $connection_options,
            'source_private_file_path' => $this->getSourceBasePath(),
            'version' => $version,
        ];
        if ($version == 6) {
            $edit['d6_source_base_path'] = $this->getSourceBasePath();
        }
        else {
            $edit['source_base_path'] = $this->getSourceBasePath();
            $edit['source_private_file_path'] = $this->getSourcePrivateBasePath();
        }
        if (count($drivers) !== 1) {
            $edit['driver'] = $driver;
        }
        return $edit;
    }
    
    /**
     * Asserts that a migrated user can login.
     */
    public function assertUserLogIn($uid, $pass) {
        $user = User::load($uid);
        $user->passRaw = $pass;
        $this->drupalLogin($user);
    }
    
    /**
     * Provides the source base path for private files for the credential form.
     *
     * @return string|null
     *   The source base path.
     */
    protected function getSourcePrivateBasePath() {
        return NULL;
    }
    
    /**
     * Checks public and private files are copied but not temporary files.
     */
    protected function assertFileMigrations() {
        $fs = \Drupal::service('file_system');
        $files = $this->getManagedFiles();
        foreach ($files as $file) {
            preg_match('/^(private|public|temporary):/', $file['uri'], $matches);
            $scheme = $matches[1];
            $filepath = $fs->realpath($file['uri']);
            if ($scheme === 'temporary') {
                $this->assertFileDoesNotExist($filepath);
            }
            else {
                $this->assertFileExists($filepath);
            }
        }
    }
    
    /**
     * Confirm emails were sent.
     */
    protected function assertEmailsSent() {
        // There should be one user activation email.
        $captured_emails = \Drupal::state()->get('system.test_mail_collector', []);
        $this->assertCount(1, $captured_emails);
        $this->assertEquals('user_status_activated', $captured_emails[0]['id']);
    }

}