/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.beam.sdk.extensions.sql.jdbc;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.Statement;
import java.util.Properties;
import java.util.ServiceLoader;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

/** Test for JDBC via {@link java.net.URLClassLoader}. */
public class JdbcJarTest {
  private static final String DRIVER_URL = "jdbc:beam:";

  @Rule public TemporaryFolder folder = new TemporaryFolder();

  private Connection getConnection() throws Exception {
    ClassLoader classLoader = ClassLoader.getSystemClassLoader();
    String path = System.getProperty("driver.jar");

    if (path != null) {
      URL jdbcUrl = new File(System.getProperty("driver.jar")).toURI().toURL();
      classLoader = new URLClassLoader(new URL[] {jdbcUrl}, ClassLoader.getSystemClassLoader());
    }

    ServiceLoader<Driver> loader = ServiceLoader.load(Driver.class, classLoader);
    Driver driver = loader.iterator().next();
    return driver.connect(DRIVER_URL, new Properties());
  }

  @Test
  public void classLoader_simple() throws Exception {
    Connection connection = getConnection();
    Statement statement = connection.createStatement();
    // SELECT 1 is a special case and does not reach the parser
    assertTrue(statement.execute("SELECT 1"));
  }

  @Test
  public void classLoader_parse() throws Exception {
    Connection connection = getConnection();
    Statement statement = connection.createStatement();
    assertTrue(statement.execute("SELECT 'beam'"));
  }

  @Test
  public void classLoader_ddl() throws Exception {
    Connection connection = getConnection();
    Statement statement = connection.createStatement();
    assertEquals(0, statement.executeUpdate("CREATE EXTERNAL TABLE test (id INTEGER) TYPE 'text'"));
    assertEquals(0, statement.executeUpdate("DROP TABLE test"));
  }

  @Test
  public void classLoader_readFile() throws Exception {
    File simpleTable = folder.newFile();

    Connection connection = getConnection();
    Statement statement = connection.createStatement();
    assertEquals(
        0,
        statement.executeUpdate(
            "CREATE EXTERNAL TABLE test (id INTEGER) TYPE 'text' LOCATION '"
                + simpleTable.getAbsolutePath()
                + "'"));
    assertTrue(statement.execute("SELECT * FROM test"));
    assertEquals(0, statement.executeUpdate("DROP TABLE test"));
  }
}
