/*
 * 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.mpp.plan.planner.plan.node.write;

import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.exception.metadata.DataTypeMismatchException;
import org.apache.iotdb.db.metadata.idtable.entry.IDeviceID;
import org.apache.iotdb.db.mpp.common.schematree.ISchemaTree;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.WritePlanNode;
import org.apache.iotdb.db.wal.buffer.IWALByteBufferView;
import org.apache.iotdb.db.wal.utils.WALWriteUtils;
import org.apache.iotdb.tsfile.exception.NotImplementedException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

public abstract class InsertNode extends WritePlanNode {

  /** this insert node doesn't need to participate in multi-leader consensus */
  public static final long NO_CONSENSUS_INDEX = ConsensusReqReader.DEFAULT_SEARCH_INDEX;

  /**
   * if use id table, this filed is id form of device path <br>
   * if not, this filed is device path<br>
   */
  protected PartialPath devicePath;

  protected boolean isAligned;
  protected MeasurementSchema[] measurementSchemas;
  protected String[] measurements;
  protected TSDataType[] dataTypes;
  // TODO(INSERT) need to change it to a function handle to update last time value
  //  protected IMeasurementMNode[] measurementMNodes;

  /** index of failed measurements -> info including measurement, data type and value */
  protected Map<Integer, FailedMeasurementInfo> failedMeasurementIndex2Info;

  /**
   * device id reference, for reuse device id in both id table and memtable <br>
   * used in memtable
   */
  protected IDeviceID deviceID;

  /**
   * this index is used by wal search, its order should be protected by the upper layer, and the
   * value should start from 1
   */
  protected long searchIndex = NO_CONSENSUS_INDEX;

  /** Physical address of data region after splitting */
  protected TRegionReplicaSet dataRegionReplicaSet;

  protected InsertNode(PlanNodeId id) {
    super(id);
  }

  protected InsertNode(
      PlanNodeId id,
      PartialPath devicePath,
      boolean isAligned,
      String[] measurements,
      TSDataType[] dataTypes) {
    super(id);
    this.devicePath = devicePath;
    this.isAligned = isAligned;
    this.measurements = measurements;
    this.dataTypes = dataTypes;
  }

  public TRegionReplicaSet getDataRegionReplicaSet() {
    return dataRegionReplicaSet;
  }

  public void setDataRegionReplicaSet(TRegionReplicaSet dataRegionReplicaSet) {
    this.dataRegionReplicaSet = dataRegionReplicaSet;
  }

  public PartialPath getDevicePath() {
    return devicePath;
  }

  public void setDevicePath(PartialPath devicePath) {
    this.devicePath = devicePath;
  }

  public boolean isAligned() {
    return isAligned;
  }

  public void setAligned(boolean aligned) {
    isAligned = aligned;
  }

  public MeasurementSchema[] getMeasurementSchemas() {
    return measurementSchemas;
  }

  public void setMeasurementSchemas(MeasurementSchema[] measurementSchemas) {
    this.measurementSchemas = measurementSchemas;
  }

  public String[] getMeasurements() {
    return measurements;
  }

  public TSDataType[] getDataTypes() {
    return dataTypes;
  }

  public TSDataType getDataType(int index) {
    return dataTypes[index];
  }

  public void setDataTypes(TSDataType[] dataTypes) {
    this.dataTypes = dataTypes;
  }

  public IDeviceID getDeviceID() {
    return deviceID;
  }

  public void setDeviceID(IDeviceID deviceID) {
    this.deviceID = deviceID;
  }

  public long getSearchIndex() {
    return searchIndex;
  }

  /** Search index should start from 1 */
  public void setSearchIndex(long searchIndex) {
    this.searchIndex = searchIndex;
  }

  @Override
  protected void serializeAttributes(ByteBuffer byteBuffer) {
    throw new NotImplementedException("serializeAttributes of InsertNode is not implemented");
  }

  @Override
  protected void serializeAttributes(DataOutputStream stream) throws IOException {
    throw new NotImplementedException("serializeAttributes of InsertNode is not implemented");
  }

  // region Serialization methods for WAL
  /** Serialized size of measurement schemas, ignoring failed time series */
  protected int serializeMeasurementSchemasSize() {
    int byteLen = 0;
    for (int i = 0; i < measurements.length; i++) {
      // ignore failed partial insert
      if (measurements[i] == null) {
        continue;
      }
      byteLen += WALWriteUtils.sizeToWrite(measurementSchemas[i]);
    }
    return byteLen;
  }

  /** Serialize measurement schemas, ignoring failed time series */
  protected void serializeMeasurementSchemasToWAL(IWALByteBufferView buffer) {
    for (int i = 0; i < measurements.length; i++) {
      // ignore failed partial insert
      if (measurements[i] == null) {
        continue;
      }
      WALWriteUtils.write(measurementSchemas[i], buffer);
    }
  }

  /**
   * Deserialize measurement schemas. Make sure the measurement schemas and measurements have been
   * created before calling this
   */
  protected void deserializeMeasurementSchemas(DataInputStream stream) throws IOException {
    for (int i = 0; i < measurementSchemas.length; i++) {
      measurementSchemas[i] = MeasurementSchema.deserializeFrom(stream);
      measurements[i] = measurementSchemas[i].getMeasurementId();
    }
  }

  protected void deserializeMeasurementSchemas(ByteBuffer buffer) {
    for (int i = 0; i < measurementSchemas.length; i++) {
      measurementSchemas[i] = MeasurementSchema.deserializeFrom(buffer);
      measurements[i] = measurementSchemas[i].getMeasurementId();
    }
  }
  // endregion

  public TRegionReplicaSet getRegionReplicaSet() {
    return dataRegionReplicaSet;
  }

  public abstract boolean validateAndSetSchema(ISchemaTree schemaTree);

  /** Check whether data types are matched with measurement schemas */
  protected boolean selfCheckDataTypes() {
    for (int i = 0; i < measurementSchemas.length; i++) {
      if (dataTypes[i] != measurementSchemas[i].getType()) {
        if (!IoTDBDescriptor.getInstance().getConfig().isEnablePartialInsert()) {
          return false;
        } else {
          markFailedMeasurement(
              i,
              new DataTypeMismatchException(
                  devicePath.getFullPath(),
                  measurements[i],
                  measurementSchemas[i].getType(),
                  dataTypes[i],
                  getMinTime(),
                  getFirstValueOfIndex(i)));
        }
      }
    }
    return true;
  }

  public abstract long getMinTime();

  public abstract Object getFirstValueOfIndex(int index);

  // region partial insert
  /**
   * Mark failed measurement, measurements[index], dataTypes[index] and values/columns[index] would
   * be null. We'd better use "measurements[index] == null" to determine if the measurement failed.
   * <br>
   * This method is not concurrency-safe.
   *
   * @param index failed measurement index
   * @param cause cause Exception of failure
   */
  public void markFailedMeasurement(int index, Exception cause) {
    throw new UnsupportedOperationException();
  }

  public boolean hasValidMeasurements() {
    for (Object o : measurements) {
      if (o != null) {
        return true;
      }
    }
    return false;
  }

  public boolean hasFailedMeasurements() {
    return failedMeasurementIndex2Info != null && !failedMeasurementIndex2Info.isEmpty();
  }

  public int getFailedMeasurementNumber() {
    return failedMeasurementIndex2Info == null ? 0 : failedMeasurementIndex2Info.size();
  }

  public List<String> getFailedMeasurements() {
    return failedMeasurementIndex2Info == null
        ? Collections.emptyList()
        : failedMeasurementIndex2Info.values().stream()
            .map(info -> info.measurement)
            .collect(Collectors.toList());
  }

  public List<Exception> getFailedExceptions() {
    return failedMeasurementIndex2Info == null
        ? Collections.emptyList()
        : failedMeasurementIndex2Info.values().stream()
            .map(info -> info.cause)
            .collect(Collectors.toList());
  }

  public List<String> getFailedMessages() {
    return failedMeasurementIndex2Info == null
        ? Collections.emptyList()
        : failedMeasurementIndex2Info.values().stream()
            .map(
                info -> {
                  Throwable cause = info.cause;
                  while (cause.getCause() != null) {
                    cause = cause.getCause();
                  }
                  return cause.getMessage();
                })
            .collect(Collectors.toList());
  }

  protected static class FailedMeasurementInfo {
    protected String measurement;
    protected TSDataType dataType;
    protected Object value;
    protected Exception cause;

    public FailedMeasurementInfo(
        String measurement, TSDataType dataType, Object value, Exception cause) {
      this.measurement = measurement;
      this.dataType = dataType;
      this.value = value;
      this.cause = cause;
    }
  }
  // endregion

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    if (!super.equals(o)) return false;
    InsertNode that = (InsertNode) o;
    return isAligned == that.isAligned
        && Objects.equals(devicePath, that.devicePath)
        && Arrays.equals(measurementSchemas, that.measurementSchemas)
        && Arrays.equals(measurements, that.measurements)
        && Arrays.equals(dataTypes, that.dataTypes)
        && Objects.equals(deviceID, that.deviceID)
        && Objects.equals(dataRegionReplicaSet, that.dataRegionReplicaSet);
  }

  @Override
  public int hashCode() {
    int result =
        Objects.hash(super.hashCode(), devicePath, isAligned, deviceID, dataRegionReplicaSet);
    result = 31 * result + Arrays.hashCode(measurementSchemas);
    result = 31 * result + Arrays.hashCode(measurements);
    result = 31 * result + Arrays.hashCode(dataTypes);
    return result;
  }
}