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;
    
    /**
     * Module handler.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * Source system data set in buildForm().
     *
     * @var array
     */
    protected $systemData;
    
    /**
     * 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.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler service.
     */
    public function __construct(StateInterface $state, MigrationPluginManagerInterface $migration_plugin_manager, PrivateTempStoreFactory $tempstore_private, MigrationState $migrationState, ConfigFactoryInterface $config_factory, ModuleHandlerInterface $module_handler = NULL) {
        parent::__construct($config_factory, $migration_plugin_manager, $state, $tempstore_private);
        $this->migrationState = $migrationState;
        if (!$module_handler) {
            @trigger_error('Calling ' . __METHOD__ . ' without the $module_handler argument is deprecated in drupal:9.1.0 and will be required in drupal:10.0.0. See https://www.drupal.org/node/3136769', E_USER_DEPRECATED);
            $module_handler = \Drupal::service('module_handler');
        }
        $this->moduleHandler = $module_handler;
    }
    
    /**
     * {@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'), $container->get('module_handler'));
    }
    
    /**
     * {@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.
        $this->systemData = $this->store
            ->get('system_data');
        // If data is missing or this is the wrong step, start over.
        if (!$version || !$this->migrations || !$this->systemData || $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, $this->systemData, $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 module name', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version machine name', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version', [
                    '@version' => $this->destinationSiteVersion,
                ]),
            ],
        ];
        $missing_count = 0;
        if (isset($display[MigrationState::NOT_FINISHED])) {
            $output = $this->prepareOutput($display[MigrationState::NOT_FINISHED]);
            foreach ($output as $data) {
                $missing_count++;
                // Get the migration status for each source module, if a module of the
                // same name exists on the destination site.
                $missing_module_list['module_list']['#rows'][] = [
                    [
                        'data' => $data['source_module_name'],
                        'class' => [
                            'upgrade-analysis-report__status-icon',
                            'upgrade-analysis-report__status-icon--error',
                        ],
                    ],
                    $data['source_machine_name'],
                    $data['destination'],
                ];
            }
        }
        // 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 module name', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version machine name', [
                    '@version' => $version,
                ]),
                $this->t('Drupal @version', [
                    '@version' => $this->destinationSiteVersion,
                ]),
            ],
        ];
        $available_count = 0;
        if (isset($display[MigrationState::FINISHED])) {
            $output = $this->prepareOutput($display[MigrationState::FINISHED]);
            foreach ($output as $data) {
                $available_count++;
                $available_module_list['module_list']['#rows'][] = [
                    [
                        'data' => $data['source_module_name'],
                        'class' => [
                            'upgrade-analysis-report__status-icon',
                            'upgrade-analysis-report__status-icon--checked',
                        ],
                    ],
                    $data['source_machine_name'],
                    $data['destination'],
                ];
            }
        }
        $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');
        $config['source_private_file_path'] = $this->store
            ->get('source_private_file_path');
        $batch_builder = (new BatchBuilder())->setTitle($this->t('Running upgrade'))
            ->setProgressMessage('')
            ->addOperation([
            MigrateUpgradeImportBatch::class,
            'run',
        ], [
            array_keys($this->migrations),
            $config,
        ])
            ->setFinishCallback([
            MigrateUpgradeImportBatch::class,
            'finished',
        ]);
        batch_set($batch_builder->toArray());
        $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');
    }
    
    /**
     * Prepare the migration state data for output.
     *
     * Each source and destination module_name is changed to the human-readable
     * name, the destination modules are put into a CSV format, and everything is
     * sorted.
     *
     * @param string[] $migration_state
     *   An array where the keys are machine names of modules on
     *   the source site. Values are lists of machine names of modules on the
     *   destination site, in CSV format.
     *
     * @return string[][]
     *   An indexed array of arrays that contain module data, sorted by the source
     *   module name. Each sub-array contains the source module name, the source
     *   module machine name, and the destination module names in a sorted CSV
     *   format.
     */
    protected function prepareOutput(array $migration_state) {
        $output = [];
        foreach ($migration_state as $source_machine_name => $destination_modules) {
            $data = NULL;
            if (isset($this->systemData['module'][$source_machine_name]['info'])) {
                $data = unserialize($this->systemData['module'][$source_machine_name]['info']);
            }
            $source_module_name = $data['name'] ?? $source_machine_name;
            // Get the names of all the destination modules.
            $destination_module_names = [];
            if (!empty($destination_modules)) {
                $destination_modules = explode(', ', $destination_modules);
                foreach ($destination_modules as $destination_module) {
                    if ($destination_module === 'core') {
                        $destination_module_names[] = 'Core';
                    }
                    else {
                        try {
                            $destination_module_names[] = $this->moduleHandler
                                ->getName($destination_module);
                        } catch (UnknownExtensionException $e) {
                            $destination_module_names[] = $destination_module;
                        }
                    }
                }
            }
            sort($destination_module_names);
            $output[$source_machine_name] = [
                'source_module_name' => $source_module_name,
                'source_machine_name' => $source_machine_name,
                'destination' => implode(', ', $destination_module_names),
            ];
        }
        usort($output, function ($a, $b) {
            return strcmp($a['source_module_name'], $b['source_module_name']);
        });
        return $output;
    }

}