/*
 * 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.tools;

import static org.junit.Assert.fail;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.exception.query.LogicalOperatorException;
import org.apache.iotdb.db.constant.TestConstant;
import org.apache.iotdb.db.tools.watermark.WatermarkDetector;
import org.apache.iotdb.db.utils.EnvironmentUtils;
import org.apache.iotdb.jdbc.Config;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/**
 * Notice that, all test begins with "IoTDB" is integration test. All test which will start the
 * IoTDB server should be defined as integration test.
 */
public class IoTDBWatermarkTest {

  private static String filePath1 = TestConstant.BASE_OUTPUT_PATH.concat("watermarked_query_result.csv");
  private static String filePath2 = TestConstant.BASE_OUTPUT_PATH.concat("notWatermarked_query_result.csv");
  private static PrintWriter writer1;
  private static PrintWriter writer2;
  private static String secretKey = "ASDFGHJKL";
  private static String watermarkBitString = "10101000100";
  private static int embed_row_cycle = 5;
  private static int embed_lsb_num = 5;

  @Before
  public void setUp() throws Exception {
    EnvironmentUtils.closeStatMonitor();
    IoTDBDescriptor.getInstance().getConfig().setEnableWatermark(true); // default false
    IoTDBDescriptor.getInstance().getConfig().setWatermarkSecretKey(secretKey);
    IoTDBDescriptor.getInstance().getConfig().setWatermarkBitString(watermarkBitString);
    IoTDBDescriptor.getInstance().getConfig().setWatermarkMethod(String.format("GroupBasedLSBMethod"
        + "(embed_row_cycle=%d,embed_lsb_num=%d)", embed_row_cycle, embed_lsb_num));

    EnvironmentUtils.envSetUp();
    insertData();

    File file1 = new File(filePath1);
    if (file1.exists()) {
      file1.delete();
    }
    writer1 = new PrintWriter(file1);
    writer1.println("time,root.vehicle.d0.s0,root.vehicle.d0.s1,root.vehicle.d0.s2");

    File file2 = new File(filePath2);
    if (file2.exists()) {
      file2.delete();
    }
    writer2 = new PrintWriter(file2);
    writer2.println("time,root.vehicle.d0.s0,root.vehicle.d0.s1,root.vehicle.d0.s2");
  }

  @After
  public void tearDown() throws Exception {
    File file1 = new File(filePath1);
    if (file1.exists()) {
      file1.delete();
    }
    File file2 = new File(filePath2);
    if (file2.exists()) {
      file2.delete();
    }
    EnvironmentUtils.cleanEnv();
  }

  private static void insertData()
      throws ClassNotFoundException, SQLException {
    Class.forName(Config.JDBC_DRIVER_NAME);
    Connection connection = null;
    try {
      connection = DriverManager
          .getConnection(Config.IOTDB_URL_PREFIX + "127.0.0.1:6667/", "root", "root");
      Statement statement = connection.createStatement();

      String[] create_sql = new String[]{"SET STORAGE GROUP TO root.vehicle",
          "CREATE TIMESERIES root.vehicle.d0.s0 WITH DATATYPE=INT32, ENCODING=RLE",
          "CREATE TIMESERIES root.vehicle.d0.s1 WITH DATATYPE=INT64, ENCODING=RLE",
          "CREATE TIMESERIES root.vehicle.d0.s2 WITH DATATYPE=FLOAT, ENCODING=RLE"
      };
      for (String sql : create_sql) {
        statement.execute(sql);
      }

      for (int time = 1; time < 1000; time++) {
        String sql = String
            .format("insert into root.vehicle.d0(timestamp,s0,s2) values(%s,%s,%s)", time,
                time % 50, time % 50, time % 50);
        statement.execute(sql);
        if (time % 10 == 0) {
          sql = String
              .format("insert into root.vehicle.d0(timestamp,s1) values(%s,%s)", time, time % 50);
          statement.execute(sql);
        }
      }
      statement.close();
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    } finally {
      if (connection != null) {
        connection.close();
      }
    }
  }

  @Test
  public void EncodeAndDecodeTest1()
      throws IOException, ClassNotFoundException, SQLException, LogicalOperatorException {
    // Watermark Embedding
    Class.forName(Config.JDBC_DRIVER_NAME);
    Connection connection = null;
    try {
      connection = DriverManager
          .getConnection(Config.IOTDB_URL_PREFIX + "127.0.0.1:6667/", "root", "root");
      Statement statement = connection.createStatement();
      statement.execute("GRANT WATERMARK_EMBEDDING TO root");
      boolean hasResultSet = statement.execute("SELECT s0,s1,s2 FROM root.vehicle.d0");
      Assert.assertTrue(hasResultSet);
      ResultSet resultSet = statement.getResultSet();
      while (resultSet.next()) {
        String ans =
            resultSet.getString(TestConstant.TIMESTAMP_STR)
                + "," + resultSet.getString(TestConstant.d0s0)
                + "," + resultSet.getString(TestConstant.d0s1)
                + "," + resultSet.getString(TestConstant.d0s2);
        writer1.println(ans);
      }
      writer1.close();
      statement.close();
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    } finally {
      if (connection != null) {
        connection.close();
      }
    }

    // Watermark Detection
    double alpha = 0.1;
    int columnIndex = 1;
    boolean isWatermarked = WatermarkDetector
        .isWatermarked(filePath1, secretKey, watermarkBitString, embed_row_cycle, embed_lsb_num,
            alpha, columnIndex, "int");
    Assert.assertTrue(isWatermarked);
  }

  @Test
  public void EncodeAndDecodeTest2()
      throws IOException, ClassNotFoundException, SQLException, LogicalOperatorException {
    // No Watermark Embedding
    Class.forName(Config.JDBC_DRIVER_NAME);
    Connection connection = null;
    try {
      connection = DriverManager
          .getConnection(Config.IOTDB_URL_PREFIX + "127.0.0.1:6667/", "root", "root");
      Statement statement = connection.createStatement();
      statement.execute("REVOKE WATERMARK_EMBEDDING FROM root");
      boolean hasResultSet = statement.execute("SELECT s0,s1,s2 FROM root.vehicle.d0");
      Assert.assertTrue(hasResultSet);
      ResultSet resultSet = statement.getResultSet();
      while (resultSet.next()) {
        String ans =
            resultSet.getString(TestConstant.TIMESTAMP_STR)
                + "," + resultSet.getString(TestConstant.d0s0)
                + "," + resultSet.getString(TestConstant.d0s1)
                + "," + resultSet.getString(TestConstant.d0s2);
        writer2.println(ans);
      }
      writer2.close();
      statement.close();
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    } finally {
      if (connection != null) {
        connection.close();
      }
    }

    // Watermark Detection
    double alpha = 0.1;
    int columnIndex = 1;
    boolean isWatermarked = WatermarkDetector
        .isWatermarked(filePath2, secretKey, watermarkBitString, embed_row_cycle, embed_lsb_num,
            alpha, columnIndex, "int");
    Assert.assertFalse(isWatermarked);
  }
}
