class ReviewForm

class ReviewForm extends MigrateUpgradeFormBase {
    
    /**
     * The migrations.
     *
     * @var \Drupal\migrate\Plugin\MigrationInterface[]
     */
    protected $migrations;
    
    /**
     * Migration state service.
     *
     * @var \Drupal\migrate_drupal\MigrationState
     */
    protected $migrationState;
    
    /**
     * ReviewForm constructor.
     *
     * @param \Drupal\Core\State\StateInterface $state
     *   The state service.
     * @param \Drupal\migrate\Plugin\MigrationPluginManagerInterface $migration_plugin_manager
     *   The migration plugin manager service.
     * @param \Drupal\Core\TempStore\PrivateTempStoreFactory $tempstore_private
     *   The private tempstore factory service.
     * @param \Drupal\migrate_drupal\MigrationState $migrationState
     *   Migration state service.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory service.
     */
    public function __construct(StateInterface $state, MigrationPluginManagerInterface $migration_plugin_manager, PrivateTempStoreFactory $tempstore_private, MigrationState $migrationState, ConfigFactoryInterface $config_factory) {
        parent::__construct($config_factory, $migration_plugin_manager, $state, $tempstore_private);
        $this->migrationState = $migrationState;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('state'), $container->get('plugin.manager.migration'), $container->get('tempstore.private'), $container->get('migrate_drupal.migration_state'), $container->get('config.factory'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'migrate_drupal_ui_review_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        // Get all the data needed for this form.
        $version = $this->store
            ->get('version');
        $this->migrations = $this->store
            ->get('migrations');
        // Fetch the source system data at the first opportunity.
        $system_data = $this->store
            ->get('system_data');
        // If data is missing or this is the wrong step, start over.
        if (!$version || !$this->migrations || !$system_data || $this->store
            ->get('step') != 'review') {
            return $this->restartUpgradeForm();
        }
        $form = parent::buildForm($form, $form_state);
        $form['#title'] = $this->t('What will be upgraded?');
        $migrations = $this->migrationPluginManager
            ->createInstances(array_keys($this->store
            ->get('migrations')));
        // Get the upgrade states for the source modules.
        $display = $this->migrationState
            ->getUpgradeStates($version, $system_data, $migrations);
        // Missing migrations.
        $missing_module_list = [
            '#type' => 'details',
            '#open' => TRUE,
            '#title' => $this->t('Modules that will not be upgraded'),
            '#summary_attributes' => [
                'id' => [
                    'error',
                ],
            ],
            '#description' => $this->t("The new site is missing modules corresponding to the old site's modules. Unless they are installed prior to the upgrade, configuration and/or content needed by them will not be available on your new site. <a href=':review'>Read the checklist</a> to help decide what to do.", [
                ':review' => 'https://www.drupal.org/docs/8/upgrade/upgrade-using-web-browser#pre-upgrade-analysis',
            ]),
            '#weight' => 2,
        ];
        $missing_module_list['module_list'] = [
            '#type' => 'table',
            '#header' => [
                $this->t('Drupal @version', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version', [
                    '@version' => $this->destinationSiteVersion,
                ]),
            ],
        ];
        $missing_count = 0;
        if (isset($display[MigrationState::NOT_FINISHED])) {
            foreach ($display[MigrationState::NOT_FINISHED] as $source_module => $destination_modules) {
                $missing_count++;
                // Get the migration status for this $source_module, if a module of the
                // same name exists on the destination site.
                $missing_module_list['module_list'][] = [
                    'source_module' => [
                        '#type' => 'html_tag',
                        '#tag' => 'span',
                        '#value' => $source_module,
                        '#attributes' => [
                            'class' => [
                                'upgrade-analysis-report__status-icon',
                                'upgrade-analysis-report__status-icon--error',
                            ],
                        ],
                    ],
                    'destination_module' => [
                        '#plain_text' => $destination_modules,
                    ],
                ];
            }
        }
        // Available migrations.
        $available_module_list = [
            '#type' => 'details',
            '#title' => $this->t('Modules that will be upgraded'),
            '#summary_attributes' => [
                'id' => [
                    'checked',
                ],
            ],
            '#weight' => 4,
        ];
        $available_module_list['module_list'] = [
            '#type' => 'table',
            '#header' => [
                $this->t('Drupal @version', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version', [
                    '@version' => $this->destinationSiteVersion,
                ]),
            ],
        ];
        $available_count = 0;
        if (isset($display[MigrationState::FINISHED])) {
            foreach ($display[MigrationState::FINISHED] as $source_module => $destination_modules) {
                $available_count++;
                $available_module_list['module_list'][] = [
                    'source_module' => [
                        '#type' => 'html_tag',
                        '#tag' => 'span',
                        '#value' => $source_module,
                        '#attributes' => [
                            'class' => [
                                'upgrade-analysis-report__status-icon',
                                'upgrade-analysis-report__status-icon--checked',
                            ],
                        ],
                    ],
                    'destination_module' => [
                        '#plain_text' => $destination_modules,
                    ],
                ];
            }
        }
        $counters = [];
        $general_info = [];
        if ($missing_count) {
            $counters[] = [
                '#theme' => 'status_report_counter',
                '#amount' => $missing_count,
                '#text' => $this->formatPlural($missing_count, 'Module will not be upgraded', 'Modules will not be upgraded'),
                '#severity' => 'error',
                '#weight' => 0,
            ];
            $general_info[] = $missing_module_list;
        }
        if ($available_count) {
            $counters[] = [
                '#theme' => 'status_report_counter',
                '#amount' => $available_count,
                '#text' => $this->formatPlural($available_count, 'Module will be upgraded', 'Modules will be upgraded'),
                '#severity' => 'checked',
                '#weight' => 1,
            ];
            $general_info[] = $available_module_list;
        }
        $form['status_report_page'] = [
            '#theme' => 'status_report_page',
            '#counters' => $counters,
            '#general_info' => $general_info,
        ];
        $form['#attached']['library'][] = 'migrate_drupal_ui/base';
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $config['source_base_path'] = $this->store
            ->get('source_base_path');
        $batch = [
            'title' => $this->t('Running upgrade'),
            'progress_message' => '',
            'operations' => [
                [
                    [
                        MigrateUpgradeImportBatch::class,
                        'run',
                    ],
                    [
                        array_keys($this->migrations),
                        $config,
                    ],
                ],
            ],
            'finished' => [
                MigrateUpgradeImportBatch::class,
                'finished',
            ],
        ];
        batch_set($batch);
        $form_state->setRedirect('<front>');
        $this->store
            ->set('step', 'overview');
        $this->state
            ->set('migrate_drupal_ui.performed', REQUEST_TIME);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Perform upgrade');
    }

}