/*
 * 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.iotdb.db.it;

import org.apache.iotdb.db.queryengine.common.header.ColumnHeaderConstant;
import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

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

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class, ClusterIT.class})
public class IoTDBFilterNullIT {

  private static final String[] createSqls =
      new String[] {
        "CREATE DATABASE root.testNullFilter",
        "CREATE TIMESERIES root.testNullFilter.d1.s1 WITH DATATYPE=INT32, ENCODING=PLAIN",
        "CREATE TIMESERIES root.testNullFilter.d1.s2 WITH DATATYPE=BOOLEAN, ENCODING=PLAIN",
        "CREATE TIMESERIES root.testNullFilter.d1.s3 WITH DATATYPE=DOUBLE, ENCODING=PLAIN"
      };

  private static final String[] insertSqls =
      new String[] {
        "INSERT INTO root.testNullFilter.d1(timestamp,s2,s3) " + "values(1, false, 11.1)",
        "INSERT INTO root.testNullFilter.d1(timestamp,s1,s2) " + "values(2, 22, true)",
        "INSERT INTO root.testNullFilter.d1(timestamp,s1,s3) " + "values(3, 23, 33.3)",
      };

  private static void prepareData() {
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      for (String createSql : createSqls) {
        statement.execute(createSql);
      }

      for (String insertSql : insertSqls) {
        statement.addBatch(insertSql);
      }
      statement.executeBatch();

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  @BeforeClass
  public static void setUp() throws Exception {
    EnvFactory.getEnv().initClusterEnvironment();
    prepareData();
  }

  @AfterClass
  public static void tearDown() throws Exception {
    EnvFactory.getEnv().cleanClusterEnvironment();
  }

  @Test
  public void nullFilterTest() {
    String[] retArray = new String[] {"1,null,false,11.1", "2,22,true,null", "3,23,null,33.3"};
    try (Connection connectionIsNull = EnvFactory.getEnv().getConnection();
        Statement statementIsNull = connectionIsNull.createStatement()) {
      int count = 0;
      try (ResultSet resultSet =
          statementIsNull.executeQuery("select * from root.testNullFilter.d1 where s1 is null")) {
        while (resultSet.next()) {
          String ans =
              resultSet.getString(ColumnHeaderConstant.TIME)
                  + ","
                  + resultSet.getString("root.testNullFilter.d1.s1")
                  + ","
                  + resultSet.getString("root.testNullFilter.d1.s2")
                  + ","
                  + resultSet.getString("root.testNullFilter.d1.s3");
          assertEquals(retArray[count], ans);
          count++;
        }
      }

      try (Connection connectionIsNotNull = EnvFactory.getEnv().getConnection();
          Statement statementIsNotNull = connectionIsNotNull.createStatement()) {
        try (ResultSet resultSet =
            statementIsNotNull.executeQuery(
                "select * from root.testNullFilter.d1 where s1 is not null")) {
          while (resultSet.next()) {
            String ans =
                resultSet.getString(ColumnHeaderConstant.TIME)
                    + ","
                    + resultSet.getString("root.testNullFilter.d1.s1")
                    + ","
                    + resultSet.getString("root.testNullFilter.d1.s2")
                    + ","
                    + resultSet.getString("root.testNullFilter.d1.s3");
            assertEquals(retArray[count], ans);
            count++;
          }
        }
        assertEquals(retArray.length, count);
      }
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    }
  }
}
