/*
 * 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.kafka;

import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.rpc.StatementExecutionException;
import org.apache.iotdb.session.pool.SessionPool;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/** The class is Thread class of Consumer. ConsumerThread. */
@SuppressWarnings({"squid:S1144"})
public class ConsumerThread implements Runnable {

  private static final Logger logger = LoggerFactory.getLogger(ConsumerThread.class);
  private KafkaConsumer<String, String> consumer;
  private SessionPool pool;

  public ConsumerThread(KafkaConsumer<String, String> consumer, SessionPool pool) {
    this.consumer = consumer;
    this.pool = pool;
  }

  /** insert data to IoTDB */
  private void insert(String data) throws IoTDBConnectionException, StatementExecutionException {
    String[] dataArray = data.split(",");
    String device = dataArray[0];
    long time = Long.parseLong(dataArray[1]);
    List<String> measurements = Arrays.asList(dataArray[2].split(":"));
    List<TSDataType> types = new ArrayList<>();
    for (String type : dataArray[3].split(":")) {
      types.add(TSDataType.valueOf(type));
    }

    List<Object> values = new ArrayList<>();
    String[] valuesStr = dataArray[4].split(":");
    for (int i = 0; i < valuesStr.length; i++) {
      switch (types.get(i)) {
        case INT64:
          values.add(Long.parseLong(valuesStr[i]));
          break;
        case DOUBLE:
          values.add(Double.parseDouble(valuesStr[i]));
          break;
        case INT32:
          values.add(Integer.parseInt(valuesStr[i]));
          break;
        case TEXT:
          values.add(valuesStr[i]);
          break;
        case FLOAT:
          values.add(Float.parseFloat(valuesStr[i]));
          break;
        case BOOLEAN:
          values.add(Boolean.parseBoolean(valuesStr[i]));
          break;
        default:
      }
    }

    pool.insertRecord(device, time, measurements, types, values);
  }

  /** insert data to IoTDB */
  private void insertDatas(List<String> datas)
      throws IoTDBConnectionException, StatementExecutionException {
    int size = datas.size();
    List<String> deviceIds = new ArrayList<>(size);
    List<Long> times = new ArrayList<>(size);

    List<List<String>> measurementsList = new ArrayList<>(size);

    List<List<TSDataType>> typesList = new ArrayList<>(size);

    List<List<Object>> valuesList = new ArrayList<>(size);

    for (String data : datas) {
      String[] dataArray = data.split(",");
      String device = dataArray[0];
      long time = Long.parseLong(dataArray[1]);
      List<String> measurements = Arrays.asList(dataArray[2].split(":"));
      List<TSDataType> types = new ArrayList<>();
      for (String type : dataArray[3].split(":")) {
        types.add(TSDataType.valueOf(type));
      }

      List<Object> values = new ArrayList<>();
      String[] valuesStr = dataArray[4].split(":");
      for (int i = 0; i < valuesStr.length; i++) {
        switch (types.get(i)) {
          case INT64:
            values.add(Long.parseLong(valuesStr[i]));
            break;
          case DOUBLE:
            values.add(Double.parseDouble(valuesStr[i]));
            break;
          case INT32:
            values.add(Integer.parseInt(valuesStr[i]));
            break;
          case TEXT:
            values.add(valuesStr[i]);
            break;
          case FLOAT:
            values.add(Float.parseFloat(valuesStr[i]));
            break;
          case BOOLEAN:
            values.add(Boolean.parseBoolean(valuesStr[i]));
            break;
          default:
        }
      }
      deviceIds.add(device);
      times.add(time);
      measurementsList.add(measurements);
      typesList.add(types);
      valuesList.add(values);
    }

    pool.insertRecords(deviceIds, times, measurementsList, typesList, valuesList);
  }

  @Override
  public void run() {
    try {
      do {
        ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(1));
        List<String> datas = new ArrayList<>(records.count());
        for (ConsumerRecord<String, String> consumerRecord : records) {
          datas.add(consumerRecord.value());
        }
        insertDatas(datas);
      } while (true);
    } catch (Exception e) {
      logger.error(e.getMessage());
    }
  }
}
