/*
 * 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.mqtt;

import org.apache.iotdb.db.conf.IoTDBConfig;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.exception.StorageEngineException;
import org.apache.iotdb.db.exception.metadata.StorageGroupNotSetException;
import org.apache.iotdb.db.exception.query.QueryProcessException;
import org.apache.iotdb.db.metadata.PartialPath;
import org.apache.iotdb.db.qp.executor.IPlanExecutor;
import org.apache.iotdb.db.qp.executor.PlanExecutor;
import org.apache.iotdb.db.qp.physical.PhysicalPlan;
import org.apache.iotdb.db.qp.physical.crud.InsertRowPlan;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;

import io.moquette.interception.AbstractInterceptHandler;
import io.moquette.interception.messages.InterceptPublishMessage;
import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.mqtt.MqttQoS;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;

/** PublishHandler handle the messages from MQTT clients. */
public class PublishHandler extends AbstractInterceptHandler {

  private static final Logger LOG = LoggerFactory.getLogger(PublishHandler.class);

  private IPlanExecutor executor;
  private PayloadFormatter payloadFormat;

  public PublishHandler(IoTDBConfig config) {
    this.payloadFormat = PayloadFormatManager.getPayloadFormat(config.getMqttPayloadFormatter());
    try {
      this.executor = new PlanExecutor();
    } catch (QueryProcessException e) {
      throw new RuntimeException(e);
    }
  }

  protected PublishHandler(IPlanExecutor executor, PayloadFormatter payloadFormat) {
    this.executor = executor;
    this.payloadFormat = payloadFormat;
  }

  @Override
  public String getID() {
    return "iotdb-mqtt-broker-listener";
  }

  @Override
  public void onPublish(InterceptPublishMessage msg) {
    String clientId = msg.getClientID();
    ByteBuf payload = msg.getPayload();
    String topic = msg.getTopicName();
    String username = msg.getUsername();
    MqttQoS qos = msg.getQos();

    LOG.debug(
        "Receive publish message. clientId: {}, username: {}, qos: {}, topic: {}, payload: {}",
        clientId,
        username,
        qos,
        topic,
        payload);

    List<Message> events = payloadFormat.format(payload);
    if (events == null) {
      return;
    }

    // since device ids from messages maybe different, so we use the InsertPlan not
    // InsertTabletPlan.
    for (Message event : events) {
      if (event == null) {
        continue;
      }

      InsertRowPlan plan = new InsertRowPlan();
      plan.setTime(event.getTimestamp());
      plan.setMeasurements(event.getMeasurements().toArray(new String[0]));
      plan.setValues(event.getValues().toArray(new Object[0]));
      plan.setDataTypes(new TSDataType[event.getValues().size()]);
      plan.setNeedInferType(true);

      boolean status = false;
      try {
        plan.setDeviceId(new PartialPath(event.getDevice()));
        status = executeNonQuery(plan);
      } catch (Exception e) {
        LOG.warn(
            "meet error when inserting device {}, measurements {}, at time {}, because ",
            event.getDevice(),
            event.getMeasurements(),
            event.getTimestamp(),
            e);
      }

      LOG.debug("event process result: {}", status);
    }
  }

  private boolean executeNonQuery(PhysicalPlan plan)
      throws QueryProcessException, StorageGroupNotSetException, StorageEngineException {
    if (IoTDBDescriptor.getInstance().getConfig().isReadOnly()) {
      throw new QueryProcessException(
          "Current system mode is read-only, does not support non-query operation");
    }
    return executor.processNonQuery(plan);
  }
}