Remove old forms tables

Signed-off-by: Jonas Rittershofer <jotoeri@users.noreply.github.com>

lib/Migration/Version030000Date20220402151229.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Jonas Rittershofer <jotoeri@users.noreply.github.com>
+ *
+ * @author Jonas Rittershofer <jotoeri@users.noreply.github.com>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * 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 OCA\Forms\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version030000Date20220402151229 extends SimpleMigrationStep {
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		$update_necessary = false;
+
+		/*
+		 * Remove old (Forms < v2) DB-Tables
+		 */
+		if ($schema->hasTable('forms_events')) {
+			$schema->dropTable('forms_events');
+			$update_necessary = true;
+		}
+		if ($schema->hasTable('forms_questions')) {
+			$schema->dropTable('forms_questions');
+			$update_necessary = true;
+		}
+		if ($schema->hasTable('forms_answers')) {
+			$schema->dropTable('forms_answers');
+			$update_necessary = true;
+		}
+		if ($schema->hasTable('forms_votes')) {
+			$schema->dropTable('forms_votes');
+			$update_necessary = true;
+		}
+
+		return $update_necesssary ? $schema : null;
+	}
+}