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<?php
/**
 * @copyright Copyright (c) 2017 Joas Schilling <coding@schilljs.com>
 *
 * @author Joas Schilling <coding@schilljs.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OC\Core\Command\Db\Migrations;


use Doctrine\DBAL\Schema\Schema;
use OC\DB\MDB2SchemaReader;
use OC\DB\MigrationService;
use OC\Migration\ConsoleOutput;
use OCP\App\IAppManager;
use OCP\IConfig;
use OCP\IDBConnection;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class GenerateFromSchemaFileCommand extends GenerateCommand {

	/** @var IConfig */
	protected $config;

	/** @var IAppManager */
	protected $appManager;

	public function __construct(IConfig $config, IAppManager $appManager, IDBConnection $connection) {
		parent::__construct($connection);
		$this->config = $config;
		$this->appManager = $appManager;
	}


	protected function configure() {
		parent::configure();

		$this->setName('migrations:generate-from-schema');
	}

	public function execute(InputInterface $input, OutputInterface $output) {
		$appName = $input->getArgument('app');
		$version = $input->getArgument('version');

		if (!preg_match('/^\d{1,16}$/',$version)) {
			$output->writeln('<error>The given version is invalid. Only 0-9 are allowed (max. 16 digits)</error>');
			return 1;
		}

		$schemaFile = $this->appManager->getAppPath($appName) . '/appinfo/database.xml';
		if (!file_exists($schemaFile)) {
			$output->writeln('<error>App ' . $appName . ' does not have a database.xml file</error>');
			return 2;
		}

		$reader = new MDB2SchemaReader($this->config, $this->connection->getDatabasePlatform());
		$schema = new Schema();
		$reader->loadSchemaFromFile($schemaFile, $schema);

		$schemaBody = $this->schemaToMigration($schema);

		$ms = new MigrationService($appName, $this->connection, new ConsoleOutput($output));

		$date = date('YmdHis');
		$path = $this->generateMigration($ms, 'Version' . $version . 'Date' . $date, $schemaBody);

		$output->writeln("New migration class has been generated to <info>$path</info>");
		return 0;
	}

	/**
	 * @param Schema $schema
	 * @return string
	 */
	protected function schemaToMigration(Schema $schema) {
		$content = <<<'EOT'
		/** @var ISchemaWrapper $schema */
		$schema = $schemaClosure();

EOT;

		foreach ($schema->getTables() as $table) {
			$content .= str_replace('{{table-name}}', substr($table->getName(), 3), <<<'EOT'

		if (!$schema->hasTable('{{table-name}}')) {
			$table = $schema->createTable('{{table-name}}');

EOT
			);

			foreach ($table->getColumns() as $column) {
				$content .= str_replace(['{{name}}', '{{type}}'], [$column->getName(), $column->getType()->getName()], <<<'EOT'
			$table->addColumn('{{name}}', '{{type}}', [

EOT
				);
				if ($column->getAutoincrement()) {
					$content .= <<<'EOT'
				'autoincrement' => true,

EOT;
				}
				$content .= str_replace('{{notnull}}', $column->getNotnull() ? 'true' : 'false', <<<'EOT'
				'notnull' => {{notnull}},

EOT
				);
				if ($column->getLength() !== null) {
					$content .= str_replace('{{length}}', $column->getLength(), <<<'EOT'
				'length' => {{length}},

EOT
					);
				}
				$default = $column->getDefault();
				if ($default !== null) {
					$default = is_numeric($default) ? $default : "'$default'";
					$content .= str_replace('{{default}}', $default, <<<'EOT'
				'default' => {{default}},

EOT
					);
				}
				if ($column->getUnsigned()) {
					$content .= <<<'EOT'
				'unsigned' => true,

EOT;
				}

				$content .= <<<'EOT'
			]);

EOT;
			}

			$content .= <<<'EOT'

EOT;

			$primaryKey = $table->getPrimaryKey();
			if ($primaryKey !== null) {
				$content .= str_replace('{{columns}}', implode('\', \'', $primaryKey->getUnquotedColumns()), <<<'EOT'
			$table->setPrimaryKey(['{{columns}}']);

EOT
				);
			}

			foreach ($table->getIndexes() as $index) {
				if ($index->isPrimary()) {
					continue;
				}

				if ($index->isUnique()) {
					$content .= str_replace(
						['{{columns}}', '{{name}}'],
						[implode('\', \'', $index->getUnquotedColumns()), $index->getName()],
						<<<'EOT'
			$table->addUniqueIndex(['{{columns}}'], '{{name}}');

EOT
					);
				} else {
					$content .= str_replace(
						['{{columns}}', '{{name}}'],
						[implode('\', \'', $index->getUnquotedColumns()), $index->getName()],
						<<<'EOT'
			$table->addIndex(['{{columns}}'], '{{name}}');

EOT
					);
				}
			}

			$content .= <<<'EOT'
		}

EOT;
		}

		$content .= <<<'EOT'
		return $schema;
EOT;

		return $content;
	}
}