/*
 * 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;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.iotdb.rpc.BatchExecutionException;
import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.rpc.StatementExecutionException;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.session.Session;
import org.apache.iotdb.session.SessionDataSet;
import org.apache.iotdb.session.SessionDataSet.DataIterator;
import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.write.record.Tablet;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;

public class SessionExample {

  private static Session session;

  public static void main(String[] args)
      throws IoTDBConnectionException, StatementExecutionException, BatchExecutionException {
    session = new Session("127.0.0.1", 6667, "root", "root");
    session.open(false);

    try {
      session.setStorageGroup("root.sg1");
    } catch (StatementExecutionException e) {
      if (e.getStatusCode() != TSStatusCode.PATH_ALREADY_EXIST_ERROR.getStatusCode())
        throw e;
    }

    createTimeseries();
    createMultiTimeseries();
    insertRecord();
    insertTablet();
    insertTablets();
    insertRecords();
    nonQuery();
    query();
    queryByIterator();
    deleteData();
    deleteTimeseries();
    session.close();
  }

  private static void createTimeseries()
      throws IoTDBConnectionException, StatementExecutionException {

    if (!session.checkTimeseriesExists("root.sg1.d1.s1")) {
      session.createTimeseries("root.sg1.d1.s1", TSDataType.INT64, TSEncoding.RLE,
          CompressionType.SNAPPY);
    }
    if (!session.checkTimeseriesExists("root.sg1.d1.s2")) {
      session.createTimeseries("root.sg1.d1.s2", TSDataType.INT64, TSEncoding.RLE,
          CompressionType.SNAPPY);
    }
    if (!session.checkTimeseriesExists("root.sg1.d1.s3")) {
      session.createTimeseries("root.sg1.d1.s3", TSDataType.INT64, TSEncoding.RLE,
          CompressionType.SNAPPY);
    }

    // create timeseries with tags and attributes
    if (!session.checkTimeseriesExists("root.sg1.d1.s4")) {
      Map<String, String> tags = new HashMap<>();
      tags.put("tag1", "v1");
      Map<String, String> attributes = new HashMap<>();
      tags.put("description", "v1");
      session.createTimeseries("root.sg1.d1.s4", TSDataType.INT64, TSEncoding.RLE,
          CompressionType.SNAPPY, null, tags, attributes, "temperature");
    }
  }

  private static void createMultiTimeseries()
      throws IoTDBConnectionException, BatchExecutionException, StatementExecutionException {

    if (!session.checkTimeseriesExists("root.sg1.d2.s1") && !session
        .checkTimeseriesExists("root.sg1.d2.s2")) {
      List<String> paths = new ArrayList<>();
      paths.add("root.sg1.d2.s1");
      paths.add("root.sg1.d2.s2");
      List<TSDataType> tsDataTypes = new ArrayList<>();
      tsDataTypes.add(TSDataType.INT64);
      tsDataTypes.add(TSDataType.INT64);
      List<TSEncoding> tsEncodings = new ArrayList<>();
      tsEncodings.add(TSEncoding.RLE);
      tsEncodings.add(TSEncoding.RLE);
      List<CompressionType> compressionTypes = new ArrayList<>();
      compressionTypes.add(CompressionType.SNAPPY);
      compressionTypes.add(CompressionType.SNAPPY);

      List<Map<String, String>> tagsList = new ArrayList<>();
      Map<String, String> tags = new HashMap<>();
      tags.put("unit", "kg");
      tagsList.add(tags);
      tagsList.add(tags);

      List<Map<String, String>> attributesList = new ArrayList<>();
      Map<String, String> attributes = new HashMap<>();
      attributes.put("minValue", "1");
      attributes.put("maxValue", "100");
      attributesList.add(attributes);
      attributesList.add(attributes);

      List<String> alias = new ArrayList<>();
      alias.add("weight1");
      alias.add("weight2");

      session
          .createMultiTimeseries(paths, tsDataTypes, tsEncodings, compressionTypes, null, tagsList,
              attributesList, alias);
    }
  }

  private static void insertRecord() throws IoTDBConnectionException, StatementExecutionException {
    String deviceId = "root.sg1.d1";
    List<String> measurements = new ArrayList<>();
    List<TSDataType> types = new ArrayList<>();
    measurements.add("s1");
    measurements.add("s2");
    measurements.add("s3");
    types.add(TSDataType.INT64);
    types.add(TSDataType.INT64);
    types.add(TSDataType.INT64);

    for (long time = 0; time < 100; time++) {
      List<Object> values = new ArrayList<>();
      values.add(1L);
      values.add(2L);
      values.add(3L);
      session.insertRecord(deviceId, time, measurements, types, values);
    }
  }

  private static void insertStrRecord() throws IoTDBConnectionException, StatementExecutionException {
    String deviceId = "root.sg1.d1";
    List<String> measurements = new ArrayList<>();
    measurements.add("s1");
    measurements.add("s2");
    measurements.add("s3");

    for (long time = 0; time < 10; time++) {
      List<String> values = new ArrayList<>();
      values.add("1");
      values.add("2");
      values.add("3");
      session.insertRecord(deviceId, time, measurements, values);
    }
  }

  private static void insertRecordInObject()
      throws IoTDBConnectionException, StatementExecutionException {
    String deviceId = "root.sg1.d1";
    List<String> measurements = new ArrayList<>();
    List<TSDataType> types = new ArrayList<>();
    measurements.add("s1");
    measurements.add("s2");
    measurements.add("s3");
    types.add(TSDataType.INT64);
    types.add(TSDataType.INT64);
    types.add(TSDataType.INT64);

    for (long time = 0; time < 100; time++) {
      session.insertRecord(deviceId, time, measurements, types, 1L, 1L, 1L);
    }
  }

  private static void insertRecords() throws IoTDBConnectionException, BatchExecutionException {
    String deviceId = "root.sg1.d1";
    List<String> measurements = new ArrayList<>();
    measurements.add("s1");
    measurements.add("s2");
    measurements.add("s3");
    List<String> deviceIds = new ArrayList<>();
    List<List<String>> measurementsList = new ArrayList<>();
    List<List<Object>> valuesList = new ArrayList<>();
    List<Long> timestamps = new ArrayList<>();
    List<List<TSDataType>> typesList = new ArrayList<>();

    for (long time = 0; time < 500; time++) {
      List<Object> values = new ArrayList<>();
      List<TSDataType> types = new ArrayList<>();
      values.add(1L);
      values.add(2L);
      values.add(3L);
      types.add(TSDataType.INT64);
      types.add(TSDataType.INT64);
      types.add(TSDataType.INT64);

      deviceIds.add(deviceId);
      measurementsList.add(measurements);
      valuesList.add(values);
      typesList.add(types);
      timestamps.add(time);
      if (time != 0 && time % 100 == 0) {
        session.insertRecords(deviceIds, timestamps, measurementsList, typesList, valuesList);
        deviceIds.clear();
        measurementsList.clear();
        valuesList.clear();
        timestamps.clear();
      }
    }

    session.insertRecords(deviceIds, timestamps, measurementsList, typesList, valuesList);
  }
  /**
   * insert the data of a device. For each timestamp, the number of measurements is the same.
   *
   * a Tablet example:
   *
   *      device1
   * time s1, s2, s3
   * 1,   1,  1,  1
   * 2,   2,  2,  2
   * 3,   3,  3,  3
   *
   * Users need to control the count of Tablet and write a batch when it reaches the maxBatchSize
   */
  private static void insertTablet() throws IoTDBConnectionException, BatchExecutionException {
    // The schema of measurements of one device
    // only measurementId and data type in MeasurementSchema take effects in Tablet
    List<MeasurementSchema> schemaList = new ArrayList<>();
    schemaList.add(new MeasurementSchema("s1", TSDataType.INT64));
    schemaList.add(new MeasurementSchema("s2", TSDataType.INT64));
    schemaList.add(new MeasurementSchema("s3", TSDataType.INT64));

    Tablet tablet = new Tablet("root.sg1.d1", schemaList, 100);

    long[] timestamps = tablet.timestamps;
    Object[] values = tablet.values;

    for (long time = 0; time < 100; time++) {
      int row = tablet.rowSize++;
      timestamps[row] = time;
      for (int i = 0; i < 3; i++) {
        long[] sensor = (long[]) values[i];
        sensor[row] = i;
      }
      if (tablet.rowSize == tablet.getMaxRowNumber()) {
        session.insertTablet(tablet, true);
        tablet.reset();
      }
    }

    if (tablet.rowSize != 0) {
      session.insertTablet(tablet);
      tablet.reset();
    }
  }

  private static void insertTablets() throws IoTDBConnectionException, BatchExecutionException {
    // The schema of measurements of one device
    // only measurementId and data type in MeasurementSchema take effects in Tablet
    List<MeasurementSchema> schemaList = new ArrayList<>();
    schemaList.add(new MeasurementSchema("s1", TSDataType.INT64));
    schemaList.add(new MeasurementSchema("s2", TSDataType.INT64));
    schemaList.add(new MeasurementSchema("s3", TSDataType.INT64));

    Tablet tablet1 = new Tablet("root.sg1.d1", schemaList, 100);
    Tablet tablet2 = new Tablet("root.sg1.d2", schemaList, 100);
    Tablet tablet3 = new Tablet("root.sg1.d3", schemaList, 100);

    Map<String, Tablet> tabletMap = new HashMap<>();
    tabletMap.put("root.sg1.d1", tablet1);
    tabletMap.put("root.sg1.d2", tablet2);
    tabletMap.put("root.sg1.d3", tablet3);

    long[] timestamps1 = tablet1.timestamps;
    Object[] values1 = tablet1.values;
    long[] timestamps2 = tablet2.timestamps;
    Object[] values2 = tablet2.values;
    long[] timestamps3 = tablet3.timestamps;
    Object[] values3 = tablet3.values;

    for (long time = 0; time < 100; time++) {
      int row1 = tablet1.rowSize++;
      int row2 = tablet2.rowSize++;
      int row3 = tablet3.rowSize++;
      timestamps1[row1] = time;
      timestamps2[row2] = time;
      timestamps3[row3] = time;
      for (int i = 0; i < 3; i++) {
        long[] sensor1 = (long[]) values1[i];
        sensor1[row1] = i;
        long[] sensor2 = (long[]) values2[i];
        sensor2[row2] = i;
        long[] sensor3 = (long[]) values3[i];
        sensor3[row3] = i;
      }
      if (tablet1.rowSize == tablet1.getMaxRowNumber()) {
        session.insertTablets(tabletMap, true);

        tablet1.reset();
        tablet2.reset();
        tablet3.reset();
      }
    }

    if (tablet1.rowSize != 0) {
      session.insertTablets(tabletMap, true);
      tablet1.reset();
      tablet2.reset();
      tablet3.reset();
    }
  }

  private static void deleteData() throws IoTDBConnectionException, StatementExecutionException {
    String path = "root.sg1.d1.s1";
    long deleteTime = 99;
    session.deleteData(path, deleteTime);
  }

  private static void deleteTimeseries()
      throws IoTDBConnectionException, StatementExecutionException {
    List<String> paths = new ArrayList<>();
    paths.add("root.sg1.d1.s1");
    paths.add("root.sg1.d1.s2");
    paths.add("root.sg1.d1.s3");
    session.deleteTimeseries(paths);
  }

  private static void query() throws IoTDBConnectionException, StatementExecutionException {
    SessionDataSet dataSet;
    dataSet = session.executeQueryStatement("select * from root.sg1.d1");
    System.out.println(dataSet.getColumnNames());
    dataSet.setFetchSize(1024); // default is 10000
    while (dataSet.hasNext()) {
      System.out.println(dataSet.next());
    }

    dataSet.closeOperationHandle();
  }

  private static void queryByIterator()
      throws IoTDBConnectionException, StatementExecutionException {
    SessionDataSet dataSet;
    dataSet = session.executeQueryStatement("select * from root.sg1.d1");
    DataIterator iterator = dataSet.iterator();
    System.out.println(dataSet.getColumnNames());
    dataSet.setFetchSize(1024); // default is 10000
    while (iterator.next()) {
      StringBuilder builder = new StringBuilder();
      // get time
      builder.append(iterator.getLong(1)).append(",");
      // get second column
      if (!iterator.isNull(2)) {
        builder.append(iterator.getLong(2)).append(",");
      } else {
        builder.append("null").append(",");
      }

      // get third column
      if (!iterator.isNull("root.sg1.d1.s2")) {
        builder.append(iterator.getLong("root.sg1.d1.s2")).append(",");
      } else {
        builder.append("null").append(",");
      }

      // get forth column
      if (!iterator.isNull(4)) {
        builder.append(iterator.getLong(4)).append(",");
      } else {
        builder.append("null").append(",");
      }

      // get fifth column
      if (!iterator.isNull("root.sg1.d1.s4")) {
        builder.append(iterator.getObject("root.sg1.d1.s4"));
      } else {
        builder.append("null");
      }

      System.out.println(builder.toString());
    }

    dataSet.closeOperationHandle();
  }

  private static void nonQuery() throws IoTDBConnectionException, StatementExecutionException {
    session.executeNonQueryStatement("insert into root.sg1.d1(timestamp,s1) values(200, 1);");
  }
}