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<?php

namespace Drush\Drupal\Commands\config;

use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Drupal\Core\Config\ImportStorageTransformer;
use Drupal\Core\Config\StorageTransformerException;
use Consolidation\AnnotatedCommand\CommandData;
use Consolidation\AnnotatedCommand\CommandError;
use Drupal\config\StorageReplaceDataWrapper;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Config\ConfigException;
use Drupal\Core\Config\ConfigImporter;
use Drupal\Core\Config\ConfigManagerInterface;
use Drupal\Core\Config\FileStorage;
use Drupal\Core\Config\StorageComparer;
use Drupal\Core\Config\StorageInterface;
use Drupal\Core\Config\TypedConfigManagerInterface;
use Drupal\Core\Extension\ModuleExtensionList;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Extension\ModuleInstallerInterface;
use Drupal\Core\Extension\ThemeHandlerInterface;
use Drupal\Core\Lock\LockBackendInterface;
use Drupal\Core\Site\Settings;
use Drupal\Core\StringTranslation\TranslationInterface;
use Drush\Commands\DrushCommands;
use Drush\Exceptions\UserAbortException;
use Symfony\Component\Filesystem\Path;

class ConfigImportCommands extends DrushCommands
{
    /**
     * @var ConfigManagerInterface
     */
    protected $configManager;

    protected $configStorage;

    protected $configStorageSync;

    protected $configCache;

    protected $eventDispatcher;

    protected $lock;

    protected $configTyped;

    protected $moduleInstaller;

    protected $themeHandler;

    protected $stringTranslation;

    protected $importStorageTransformer;

    /**
     * @var ModuleHandlerInterface
     */
    protected $moduleHandler;

    /**
     * The module extension list.
     *
     * @var ModuleExtensionList
     */
    protected $moduleExtensionList;

    public function getConfigManager(): ConfigManagerInterface
    {
        return $this->configManager;
    }

    public function getConfigStorage(): StorageInterface
    {
        return $this->configStorage;
    }

    public function getConfigStorageSync(): StorageInterface
    {
        return $this->configStorageSync;
    }

    /**
     * @param StorageInterface|null $syncStorage
     */
    public function setConfigStorageSync($syncStorage): void
    {
        $this->configStorageSync = $syncStorage;
    }

    public function getConfigCache(): CacheBackendInterface
    {
        return $this->configCache;
    }

    public function getModuleHandler(): ModuleHandlerInterface
    {
        return $this->moduleHandler;
    }

    /**
     * Note that type hint is changing https://www.drupal.org/project/drupal/issues/3161983
     */
    public function getEventDispatcher(): EventDispatcherInterface
    {
        return $this->eventDispatcher;
    }

    public function getLock(): LockBackendInterface
    {
        return $this->lock;
    }

    public function getConfigTyped(): TypedConfigManagerInterface
    {
        return $this->configTyped;
    }

    public function getModuleInstaller(): ModuleInstallerInterface
    {
        return $this->moduleInstaller;
    }

    public function getThemeHandler(): ThemeHandlerInterface
    {
        return $this->themeHandler;
    }

    public function getStringTranslation(): TranslationInterface
    {
        return $this->stringTranslation;
    }

    public function setImportTransformer(ImportStorageTransformer $importStorageTransformer): void
    {
        $this->importStorageTransformer = $importStorageTransformer;
    }

    public function hasImportTransformer(): bool
    {
        return isset($this->importStorageTransformer);
    }

    public function getImportTransformer(): ?ImportStorageTransformer
    {
        return $this->importStorageTransformer;
    }

    /**
     * @return ModuleExtensionList
     */
    public function getModuleExtensionList(): ModuleExtensionList
    {
        return $this->moduleExtensionList;
    }

    /**
     * @param ConfigManagerInterface $configManager
     * @param StorageInterface $configStorage
     * @param StorageInterface $configStorageSync
     * @param CacheBackendInterface $configCache
     * @param ModuleHandlerInterface $moduleHandler
     * @param $eventDispatcher
     * @param LockBackendInterface $lock
     * @param TypedConfigManagerInterface $configTyped
     * @param ModuleInstallerInterface $moduleInstaller
     * @param ThemeHandlerInterface $themeHandler
     * @param TranslationInterface $stringTranslation
     * @param ModuleExtensionList $moduleExtensionList
     */
    public function __construct(
        ConfigManagerInterface $configManager,
        StorageInterface $configStorage,
        CacheBackendInterface $configCache,
        ModuleHandlerInterface $moduleHandler,
        // Omit type hint as it changed in https://www.drupal.org/project/drupal/issues/3161983
        $eventDispatcher,
        LockBackendInterface $lock,
        TypedConfigManagerInterface $configTyped,
        ModuleInstallerInterface $moduleInstaller,
        ThemeHandlerInterface $themeHandler,
        TranslationInterface $stringTranslation,
        ModuleExtensionList $moduleExtensionList
    ) {
        parent::__construct();
        $this->configManager = $configManager;
        $this->configStorage = $configStorage;
        $this->configCache = $configCache;
        $this->moduleHandler = $moduleHandler;
        $this->eventDispatcher = $eventDispatcher;
        $this->lock = $lock;
        $this->configTyped = $configTyped;
        $this->moduleInstaller = $moduleInstaller;
        $this->themeHandler = $themeHandler;
        $this->stringTranslation = $stringTranslation;
        $this->moduleExtensionList = $moduleExtensionList;
    }

    /**
     * Import config from a config directory.
     *
     * @command config:import
     *
     *
     * @return bool|void
     * @option diff Show preview as a diff.
     * @option source An arbitrary directory that holds the configuration files.
     * @option partial Allows for partial config imports from the source directory. Only updates and new configs will be processed with this flag (missing configs will not be deleted). No config transformation happens.
     * @aliases cim,config-import
     * @topics docs:deploy
     * @bootstrap full
     *
     * @throws StorageTransformerException
     * @throws UserAbortException
     */
    public function import(array $options = ['source' => self::REQ, 'partial' => false, 'diff' => false])
    {
        // Determine source directory.
        $source_storage_dir = ConfigCommands::getDirectory($options['source']);

        // Prepare the configuration storage for the import.
        if ($source_storage_dir == Path::canonicalize(Settings::get('config_sync_directory'))) {
            $source_storage = $this->getConfigStorageSync();
        } else {
            $source_storage = new FileStorage($source_storage_dir);
        }

        // Determine $source_storage in partial case.
        $active_storage = $this->getConfigStorage();
        if ($options['partial']) {
            $replacement_storage = new StorageReplaceDataWrapper($active_storage);
            foreach ($source_storage->listAll() as $name) {
                $data = $source_storage->read($name);
                $replacement_storage->replaceData($name, $data);
            }
            $source_storage = $replacement_storage;
        } elseif ($this->hasImportTransformer()) {
            // Use the import transformer if it is available. (Drupal ^8.8)
            // Drupal core does not apply transformations for single imports.
            // And in addition the StorageReplaceDataWrapper is not compatible
            // with StorageCopyTrait::replaceStorageContents.
            $source_storage = $this->getImportTransformer()->transform($source_storage);
        }

        $config_manager = $this->getConfigManager();
        $storage_comparer = new StorageComparer($source_storage, $active_storage, $config_manager);


        if (!$storage_comparer->createChangelist()->hasChanges()) {
            $this->logger()->notice(('There are no changes to import.'));
            return;
        }

        if (!$options['diff']) {
            $change_list = [];
            foreach ($storage_comparer->getAllCollectionNames() as $collection) {
                $change_list[$collection] = $storage_comparer->getChangelist(null, $collection);
            }
            $table = ConfigCommands::configChangesTable($change_list, $this->output());
            $table->render();
        } else {
            $output = ConfigCommands::getDiff($active_storage, $source_storage, $this->output());

            $this->output()->writeln($output);
        }

        if (!$this->io()->confirm(dt('Import the listed configuration changes?'))) {
            throw new UserAbortException();
        }
        return drush_op([$this, 'doImport'], $storage_comparer);
    }

    // Copied from submitForm() at /core/modules/config/src/Form/ConfigSync.php
    public function doImport($storage_comparer): void
    {
        $config_importer = new ConfigImporter(
            $storage_comparer,
            $this->getEventDispatcher(),
            $this->getConfigManager(),
            $this->getLock(),
            $this->getConfigTyped(),
            $this->getModuleHandler(),
            $this->getModuleInstaller(),
            $this->getThemeHandler(),
            $this->getStringTranslation(),
            $this->getModuleExtensionList()
        );
        if ($config_importer->alreadyImporting()) {
            $this->logger()->warning('Another request may be synchronizing configuration already.');
        } else {
            try {
                // This is the contents of \Drupal\Core\Config\ConfigImporter::import.
                // Copied here so we can log progress.
                if ($config_importer->hasUnprocessedConfigurationChanges()) {
                    $sync_steps = $config_importer->initialize();
                    foreach ($sync_steps as $step) {
                        $context = [];
                        do {
                            $config_importer->doSyncStep($step, $context);
                            if (isset($context['message'])) {
                                $this->logger()->notice(str_replace('Synchronizing', 'Synchronized', (string)$context['message']));
                            }
                        } while ($context['finished'] < 1);
                    }
                    // Clear the cache of the active config storage.
                    $this->getConfigCache()->deleteAll();
                }
                if ($config_importer->getErrors()) {
                    throw new ConfigException('Errors occurred during import');
                } else {
                    $this->logger()->success('The configuration was imported successfully.');
                }
            } catch (ConfigException $e) {
                // Return a negative result for UI purposes. We do not differentiate
                // between an actual synchronization error and a failed lock, because
                // concurrent synchronizations are an edge-case happening only when
                // multiple developers or site builders attempt to do it without
                // coordinating.
                $message = 'The import failed due to the following reasons:' . "\n";
                $message .= implode("\n", $config_importer->getErrors());

                watchdog_exception('config_import', $e);
                throw new \Exception($message);
            }
        }
    }

    /**
     * @hook validate config:import
     * @param CommandData $commandData
     * @return CommandError|null
     */
    public function validate(CommandData $commandData)
    {
        $msgs = [];
        if ($commandData->input()->getOption('partial') && !\Drupal::moduleHandler()->moduleExists('config')) {
            $msgs[] = 'Enable the config module in order to use the --partial option.';
        }

        if ($source = $commandData->input()->getOption('source')) {
            if (!file_exists($source)) {
                $msgs[] = 'The source directory does not exist.';
            }
            if (!is_dir($source)) {
                $msgs[] = 'The source is not a directory.';
            }
        }

        if ($msgs) {
            return new CommandError(implode(' ', $msgs));
        }
    }
}