/*
 * 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.it.utils.TsFileGenerator;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;
import org.apache.iotdb.jdbc.IoTDBSQLException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.nio.file.Files;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class, ClusterIT.class})
public class IOTDBLoadTsFileIT {
  private static final Logger LOGGER = LoggerFactory.getLogger(IOTDBLoadTsFileIT.class);
  private static final long PARTITION_INTERVAL = 10 * 1000L;

  private File tmpDir;

  @Before
  public void setUp() throws Exception {
    tmpDir = new File(Files.createTempDirectory("load").toUri());
    EnvFactory.getEnv().getConfig().getCommonConfig().setTimePartitionInterval(PARTITION_INTERVAL);
    EnvFactory.getEnv().initClusterEnvironment();
  }

  @After
  public void tearDown() throws Exception {
    deleteSG();
    EnvFactory.getEnv().cleanClusterEnvironment();

    if (!deleteDir()) {
      LOGGER.error("Can not delete tmp dir for loading tsfile.");
    }
  }

  private void registerSchema() throws SQLException {
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute("CREATE DATABASE " + SchemaConfig.STORAGE_GROUP_0);
      statement.execute("CREATE DATABASE " + SchemaConfig.STORAGE_GROUP_1);

      statement.execute(convert2SQL(SchemaConfig.DEVICE_0, SchemaConfig.MEASUREMENT_00));
      statement.execute(convert2SQL(SchemaConfig.DEVICE_0, SchemaConfig.MEASUREMENT_01));
      statement.execute(convert2SQL(SchemaConfig.DEVICE_0, SchemaConfig.MEASUREMENT_02));
      statement.execute(convert2SQL(SchemaConfig.DEVICE_0, SchemaConfig.MEASUREMENT_03));

      statement.execute(
          convert2AlignedSQL(
              SchemaConfig.DEVICE_1,
              Arrays.asList(
                  SchemaConfig.MEASUREMENT_10,
                  SchemaConfig.MEASUREMENT_11,
                  SchemaConfig.MEASUREMENT_12,
                  SchemaConfig.MEASUREMENT_13)));

      statement.execute(convert2SQL(SchemaConfig.DEVICE_2, SchemaConfig.MEASUREMENT_20));

      statement.execute(convert2SQL(SchemaConfig.DEVICE_3, SchemaConfig.MEASUREMENT_30));

      statement.execute(
          convert2AlignedSQL(SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40)));
    }
  }

  private String convert2SQL(String device, MeasurementSchema schema) {
    String sql =
        String.format(
            "create timeseries %s %s",
            new Path(device, schema.getMeasurementId(), true).getFullPath(),
            schema.getType().name());
    LOGGER.info(String.format("schema execute: %s.", sql));
    return sql;
  }

  private String convert2AlignedSQL(String device, List<MeasurementSchema> schemas) {
    String sql = String.format("create aligned timeseries %s(", device);
    for (int i = 0; i < schemas.size(); i++) {
      MeasurementSchema schema = schemas.get(i);
      sql += (String.format("%s %s", schema.getMeasurementId(), schema.getType().name()));
      sql += (i == schemas.size() - 1 ? ")" : ",");
    }
    LOGGER.info(String.format("schema execute: %s.", sql));
    return sql;
  }

  private void deleteSG() throws SQLException {
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("delete database %s", SchemaConfig.STORAGE_GROUP_0));
      statement.execute(String.format("delete database %s", SchemaConfig.STORAGE_GROUP_1));
    } catch (IoTDBSQLException e) {
      LOGGER.info(String.format("delete storage group message : %s", e.getMessage()));
    }
  }

  private boolean deleteDir() {
    for (File file : tmpDir.listFiles()) {
      if (!file.delete()) {
        return false;
      }
    }
    return tmpDir.delete();
  }

  @Test
  public void testLoad() throws Exception {
    registerSchema();

    long writtenPoint1 = 0;
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "1-0-0-0.tsfile"))) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 100000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 100000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint1 = generator.getTotalNumber();
    }

    long writtenPoint2 = 0;
    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "2-0-0-0.tsfile"))) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint2 = generator.getTotalNumber();
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\" sglevel=2", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
          long sg2Count = resultSet.getLong("count(root.sg.test_1.*.*)");
          Assert.assertEquals(writtenPoint2, sg2Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
    }
  }

  @Test
  public void testLoadWithAutoRegister() throws Exception {
    long writtenPoint1 = 0;
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "1-0-0-0.tsfile"))) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint1 = generator.getTotalNumber();
    }

    long writtenPoint2 = 0;
    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "2-0-0-0.tsfile"))) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint2 = generator.getTotalNumber();
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\" sglevel=2", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
          long sg2Count = resultSet.getLong("count(root.sg.test_1.*.*)");
          Assert.assertEquals(writtenPoint2, sg2Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }

      Map<String, String> isAligned = new HashMap<>();
      isAligned.put(SchemaConfig.DEVICE_0, "false");
      isAligned.put(SchemaConfig.DEVICE_1, "true");
      isAligned.put(SchemaConfig.DEVICE_2, "false");
      isAligned.put(SchemaConfig.DEVICE_3, "false");
      isAligned.put(SchemaConfig.DEVICE_4, "true");
      try (ResultSet resultSet = statement.executeQuery("show devices")) {
        int size = 0;
        while (resultSet.next()) {
          size += 1;
          String device = resultSet.getString(ColumnHeaderConstant.DEVICE);
          Assert.assertEquals(
              isAligned.get(device), resultSet.getString(ColumnHeaderConstant.IS_ALIGNED));
        }
        Assert.assertEquals(isAligned.size(), size);
      } catch (Exception e) {
        e.printStackTrace();
        Assert.fail("Parse result set error.");
      }
    }
  }

  @Test
  public void testLoadWithOnSuccess() throws Exception {
    File file1 = new File(tmpDir, "1-0-0-0.tsfile");
    File file2 = new File(tmpDir, "2-0-0-0.tsfile");
    long writtenPoint1 = 0;
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(file1)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint1 = generator.getTotalNumber();
    }

    long writtenPoint2 = 0;
    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(file2)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint2 = generator.getTotalNumber();
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(
          String.format("load \"%s\" sglevel=2 onSuccess=none", file1.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
      Assert.assertTrue(file1.exists());
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(
          String.format("load \"%s\" sglevel=2 onSuccess=delete", file2.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
          long sg2Count = resultSet.getLong("count(root.sg.test_1.*.*)");
          Assert.assertEquals(writtenPoint2, sg2Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
      Assert.assertFalse(file2.exists());
    }
  }

  @Test
  public void testLoadWithLastCache() throws Exception {
    registerSchema();

    String device = SchemaConfig.DEVICE_0;
    String measurement = SchemaConfig.MEASUREMENT_00.getMeasurementId();

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(
          String.format("insert into %s(timestamp, %s) values(100, 100)", device, measurement));

      try (ResultSet resultSet =
          statement.executeQuery(String.format("select last %s from %s", measurement, device))) {
        if (resultSet.next()) {
          String lastValue = resultSet.getString(ColumnHeaderConstant.VALUE);
          Assert.assertEquals("100", lastValue);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
    }

    File file1 = new File(tmpDir, "1-0-0-0.tsfile");
    File file2 = new File(tmpDir, "2-0-0-0.tsfile");
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(file1)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 10000, PARTITION_INTERVAL / 10_000, true);
    }

    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(file2)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 10000, PARTITION_INTERVAL / 10_000, true);
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\" sglevel=2", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery(String.format("select last %s from %s", measurement, device))) {
        if (resultSet.next()) {
          String lastTime = resultSet.getString(ColumnHeaderConstant.TIME);
          Assert.assertEquals(String.valueOf(PARTITION_INTERVAL), lastTime);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
    }
  }

  @Test
  public void testLoadWithOnNonStandardTsFileName() throws Exception {
    File file1 = new File(tmpDir, "1-0-0-0.tsfile");
    File file2 = new File(tmpDir, "a-1.tsfile");
    long writtenPoint1 = 0;
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(file1)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint1 = generator.getTotalNumber();
    }

    long writtenPoint2 = 0;
    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(file2)) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 10000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 10000, PARTITION_INTERVAL / 10_000, true);
      writtenPoint2 = generator.getTotalNumber();
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\" sglevel=2", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
          long sg2Count = resultSet.getLong("count(root.sg.test_1.*.*)");
          Assert.assertEquals(writtenPoint2, sg2Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
    }
  }

  @Test
  public void testLoadWithMods() throws Exception {
    long writtenPoint1 = 0;
    // device 0, device 1, sg 0
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "1-0-0-0.tsfile"))) {
      generator.registerTimeseries(
          SchemaConfig.DEVICE_0,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_00,
              SchemaConfig.MEASUREMENT_01,
              SchemaConfig.MEASUREMENT_02,
              SchemaConfig.MEASUREMENT_03));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_1,
          Arrays.asList(
              SchemaConfig.MEASUREMENT_10,
              SchemaConfig.MEASUREMENT_11,
              SchemaConfig.MEASUREMENT_12,
              SchemaConfig.MEASUREMENT_13));
      generator.generateData(SchemaConfig.DEVICE_0, 100000, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_1, 100000, PARTITION_INTERVAL / 10_000, true);
      generator.generateDeletion(SchemaConfig.DEVICE_0, 10);
      generator.generateDeletion(SchemaConfig.DEVICE_1, 10);
      writtenPoint1 = generator.getTotalNumber();
    }

    long writtenPoint2 = 0;
    // device 2, device 3, device4, sg 1
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "2-0-0-0.tsfile"))) {
      generator.resetRandom(1000);
      generator.registerTimeseries(
          SchemaConfig.DEVICE_2, Arrays.asList(SchemaConfig.MEASUREMENT_20));
      generator.registerTimeseries(
          SchemaConfig.DEVICE_3, Arrays.asList(SchemaConfig.MEASUREMENT_30));
      generator.registerAlignedTimeseries(
          SchemaConfig.DEVICE_4, Arrays.asList(SchemaConfig.MEASUREMENT_40));
      generator.generateData(SchemaConfig.DEVICE_2, 100, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_3, 100, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 100, PARTITION_INTERVAL / 10_000, true);
      generator.generateDeletion(SchemaConfig.DEVICE_2, 2);
      generator.generateDeletion(SchemaConfig.DEVICE_4, 2);
      generator.generateData(SchemaConfig.DEVICE_2, 100, PARTITION_INTERVAL / 10_000, false);
      generator.generateData(SchemaConfig.DEVICE_4, 100, PARTITION_INTERVAL / 10_000, true);
      generator.generateDeletion(SchemaConfig.DEVICE_2, 2);
      generator.generateDeletion(SchemaConfig.DEVICE_4, 2);
      writtenPoint2 = generator.getTotalNumber();
    }

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\" sglevel=2", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet =
          statement.executeQuery("select count(*) from root.** group by level=1,2")) {
        if (resultSet.next()) {
          long sg1Count = resultSet.getLong("count(root.sg.test_0.*.*)");
          Assert.assertEquals(writtenPoint1, sg1Count);
          long sg2Count = resultSet.getLong("count(root.sg.test_1.*.*)");
          Assert.assertEquals(writtenPoint2, sg2Count);
        } else {
          Assert.fail("This ResultSet is empty.");
        }
      }
    }
  }

  @Test
  public void testLoadWithEmptyTsFile() throws Exception {
    try (TsFileGenerator generator = new TsFileGenerator(new File(tmpDir, "1-0-0-0.tsfile"))) {}

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      statement.execute(String.format("load \"%s\"", tmpDir.getAbsolutePath()));

      try (ResultSet resultSet = statement.executeQuery("show timeseries")) {
        Assert.assertFalse(resultSet.next());
      }
    }
  }

  private static class SchemaConfig {
    private static final String STORAGE_GROUP_0 = "root.sg.test_0";
    private static final String STORAGE_GROUP_1 = "root.sg.test_1";

    // device 0, nonaligned, sg 0
    private static final String DEVICE_0 = "root.sg.test_0.d_0";
    private static final MeasurementSchema MEASUREMENT_00 =
        new MeasurementSchema("sensor_00", TSDataType.INT32, TSEncoding.RLE);
    private static final MeasurementSchema MEASUREMENT_01 =
        new MeasurementSchema("sensor_01", TSDataType.INT64, TSEncoding.RLE);
    private static final MeasurementSchema MEASUREMENT_02 =
        new MeasurementSchema("sensor_02", TSDataType.DOUBLE, TSEncoding.GORILLA);
    private static final MeasurementSchema MEASUREMENT_03 =
        new MeasurementSchema("sensor_03", TSDataType.TEXT, TSEncoding.PLAIN);

    // device 1, aligned, sg 0
    private static final String DEVICE_1 = "root.sg.test_0.a_1";
    private static final MeasurementSchema MEASUREMENT_10 =
        new MeasurementSchema("sensor_10", TSDataType.INT32, TSEncoding.RLE);
    private static final MeasurementSchema MEASUREMENT_11 =
        new MeasurementSchema("sensor_11", TSDataType.INT64, TSEncoding.RLE);
    private static final MeasurementSchema MEASUREMENT_12 =
        new MeasurementSchema("sensor_12", TSDataType.DOUBLE, TSEncoding.GORILLA);
    private static final MeasurementSchema MEASUREMENT_13 =
        new MeasurementSchema("sensor_13", TSDataType.TEXT, TSEncoding.PLAIN);

    // device 2, non aligned, sg 1
    private static final String DEVICE_2 = "root.sg.test_1.d_2";
    private static final MeasurementSchema MEASUREMENT_20 =
        new MeasurementSchema("sensor_20", TSDataType.INT32, TSEncoding.RLE);

    // device 3, non aligned, sg 1
    private static final String DEVICE_3 = "root.sg.test_1.d_3";
    private static final MeasurementSchema MEASUREMENT_30 =
        new MeasurementSchema("sensor_30", TSDataType.INT32, TSEncoding.RLE);

    // device 4, aligned, sg 1
    private static final String DEVICE_4 = "root.sg.test_1.a_4";
    private static final MeasurementSchema MEASUREMENT_40 =
        new MeasurementSchema("sensor_40", TSDataType.INT32, TSEncoding.RLE);
  }
}
