/**
  * {@inheritdoc}
  */
 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $generatorConfig = $this->getGeneratorConfig(array('propel.platform.class' => $input->getOption('platform'), 'propel.reverse.parser.class' => $this->getReverseClass($input), 'propel.migration.table' => $input->getOption('migration-table')), $input);
     $this->createDirectory($input->getOption('output-dir'));
     $manager = new MigrationManager();
     $manager->setGeneratorConfig($generatorConfig);
     $manager->setSchemas($this->getSchemas($input->getOption('input-dir')));
     $connections = array();
     $optionConnections = $input->getOption('connection');
     if (!$optionConnections) {
         $connections = $generatorConfig->getBuildConnections($input->getOption('input-dir'));
     } else {
         foreach ($optionConnections as $connection) {
             list($name, $dsn, $infos) = $this->parseConnection($connection);
             $connections[$name] = array_merge(array('dsn' => $dsn), $infos);
         }
     }
     $manager->setConnections($connections);
     $manager->setMigrationTable($input->getOption('migration-table'));
     $manager->setWorkingDirectory($input->getOption('output-dir'));
     if ($manager->hasPendingMigrations()) {
         throw new RuntimeException('Uncommitted migrations have been found ; you should either execute or delete them before rerunning the \'diff\' task');
     }
     $totalNbTables = 0;
     $schema = new Schema();
     foreach ($connections as $name => $params) {
         if ($input->getOption('verbose')) {
             $output->writeln(sprintf('Connecting to database "%s" using DSN "%s"', $name, $params['dsn']));
         }
         $conn = $manager->getAdapterConnection($name);
         $platform = $generatorConfig->getConfiguredPlatform($conn, $name);
         if (!$platform->supportsMigrations()) {
             $output->writeln(sprintf('Skipping database "%s" since vendor "%s" does not support migrations', $name, $platform->getDatabaseType()));
             continue;
         }
         $database = new Database($name);
         $database->setPlatform($platform);
         $database->setDefaultIdMethod(IdMethod::NATIVE);
         $parser = $generatorConfig->getConfiguredSchemaParser($conn);
         $nbTables = $parser->parse($database, $this);
         $schema->addDatabase($database);
         $totalNbTables += $nbTables;
         if ($input->getOption('verbose')) {
             $output->writeln(sprintf('%d tables found in database "%s"', $nbTables, $name), Output::VERBOSITY_VERBOSE);
         }
     }
     if ($totalNbTables) {
         $output->writeln(sprintf('%d tables found in all databases.', $totalNbTables));
     } else {
         $output->writeln('No table found in all databases');
     }
     $appDatasFromXml = $manager->getDataModels();
     $appDataFromXml = array_pop($appDatasFromXml);
     // comparing models
     $output->writeln('Comparing models...');
     $migrationsUp = array();
     $migrationsDown = array();
     foreach ($schema->getDatabases() as $database) {
         $name = $database->getName();
         if ($input->getOption('verbose')) {
             $output->writeln(sprintf('Comparing database "%s"', $name));
         }
         if (!$appDataFromXml->hasDatabase($name)) {
             // FIXME: tables present in database but not in XML
             continue;
         }
         $databaseDiff = DatabaseComparator::computeDiff($database, $appDataFromXml->getDatabase($name));
         if (!$databaseDiff) {
             if ($input->getOption('verbose')) {
                 $output->writeln(sprintf('Same XML and database structures for datasource "%s" - no diff to generate', $name));
             }
             continue;
         }
         $output->writeln(sprintf('Structure of database was modified in datasource "%s": %s', $name, $databaseDiff->getDescription()));
         $platform = $generatorConfig->getConfiguredPlatform(null, $name);
         $migrationsUp[$name] = $platform->getModifyDatabaseDDL($databaseDiff);
         $migrationsDown[$name] = $platform->getModifyDatabaseDDL($databaseDiff->getReverseDiff());
     }
     if (!$migrationsUp) {
         $output->writeln('Same XML and database structures for all datasource - no diff to generate');
         return;
     }
     $timestamp = time();
     $migrationFileName = $manager->getMigrationFileName($timestamp);
     $migrationClassBody = $manager->getMigrationClassBody($migrationsUp, $migrationsDown, $timestamp);
     $file = $input->getOption('output-dir') . DIRECTORY_SEPARATOR . $migrationFileName;
     file_put_contents($file, $migrationClassBody);
     $output->writeln(sprintf('"%s" file successfully created.', $file));
     if (null !== ($editorCmd = $input->getOption('editor'))) {
         $output->writeln(sprintf('Using "%s" as text editor', $editorCmd));
         shell_exec($editorCmd . ' ' . escapeshellarg($file));
     } else {
         $output->writeln('Please review the generated SQL statements, and add data migration code if necessary.');
         $output->writeln('Once the migration class is valid, call the "migrate" task to execute it.');
     }
 }