/*
 * 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.queryengine.plan.statement.crud;

import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.exception.sql.SemanticException;
import org.apache.iotdb.db.queryengine.common.MPPQueryContext;
import org.apache.iotdb.db.queryengine.plan.analyze.schema.ISchemaValidation;
import org.apache.iotdb.db.queryengine.plan.statement.StatementType;
import org.apache.iotdb.db.queryengine.plan.statement.StatementVisitor;
import org.apache.iotdb.db.schemaengine.schemaregion.attribute.update.UpdateDetailContainer;

import org.apache.tsfile.annotations.TableModel;
import org.apache.tsfile.enums.TSDataType;
import org.apache.tsfile.exception.NotImplementedException;
import org.apache.tsfile.utils.RamUsageEstimator;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

public class InsertMultiTabletsStatement extends InsertBaseStatement {

  private static final long INSTANCE_SIZE =
      RamUsageEstimator.shallowSizeOfInstance(InsertMultiTabletsStatement.class);

  /** The {@link InsertTabletStatement} list */
  List<InsertTabletStatement> insertTabletStatementList;

  public InsertMultiTabletsStatement() {
    super();
    statementType = StatementType.MULTI_BATCH_INSERT;
  }

  public List<InsertTabletStatement> getInsertTabletStatementList() {
    return insertTabletStatementList;
  }

  public void setInsertTabletStatementList(List<InsertTabletStatement> insertTabletStatementList) {
    this.insertTabletStatementList = insertTabletStatementList;
  }

  public List<PartialPath> getDevicePaths() {
    List<PartialPath> partialPaths = new ArrayList<>();
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      partialPaths.add(insertTabletStatement.devicePath);
    }
    return partialPaths;
  }

  public List<String[]> getMeasurementsList() {
    List<String[]> measurementsList = new ArrayList<>();
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      measurementsList.add(insertTabletStatement.measurements);
    }
    return measurementsList;
  }

  @Override
  public boolean isEmpty() {
    return insertTabletStatementList.isEmpty();
  }

  @Override
  public <R, C> R accept(StatementVisitor<R, C> visitor, C context) {
    return visitor.visitInsertMultiTablets(this, context);
  }

  @Override
  public List<PartialPath> getPaths() {
    List<PartialPath> result = new ArrayList<>();
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      result.addAll(insertTabletStatement.getPaths());
    }
    return result;
  }

  @Override
  public ISchemaValidation getSchemaValidation() {
    throw new UnsupportedOperationException();
  }

  @Override
  public List<ISchemaValidation> getSchemaValidationList() {
    return insertTabletStatementList.stream()
        .map(InsertTabletStatement::getSchemaValidation)
        .collect(Collectors.toList());
  }

  @Override
  public void updateAfterSchemaValidation(MPPQueryContext context) {
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      if (!this.hasFailedMeasurements() && insertTabletStatement.hasFailedMeasurements()) {
        this.failedMeasurementIndex2Info = insertTabletStatement.failedMeasurementIndex2Info;
      }
    }
  }

  @Override
  protected boolean checkAndCastDataType(int columnIndex, TSDataType dataType) {
    return false;
  }

  @Override
  public void semanticCheck() {
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      insertTabletStatement.semanticCheck();
    }
  }

  @Override
  public long getMinTime() {
    throw new NotImplementedException();
  }

  @Override
  public Object getFirstValueOfIndex(int index) {
    throw new NotImplementedException();
  }

  @Override
  public InsertBaseStatement removeLogicalView() {
    List<InsertTabletStatement> mergedList = new ArrayList<>();
    boolean needSplit = false;
    for (InsertTabletStatement child : this.insertTabletStatementList) {
      List<InsertTabletStatement> childSplitResult = child.getSplitList();
      needSplit = needSplit || child.isNeedSplit();
      mergedList.addAll(childSplitResult);
    }
    if (!needSplit) {
      return this;
    }
    InsertMultiTabletsStatement splitResult = new InsertMultiTabletsStatement();
    splitResult.setInsertTabletStatementList(mergedList);
    return splitResult;
  }

  @TableModel
  @Override
  public void toLowerCase() {
    insertTabletStatementList.forEach(InsertTabletStatement::toLowerCase);
  }

  @Override
  protected long calculateBytesUsed() {
    return INSTANCE_SIZE
        + (Objects.nonNull(insertTabletStatementList)
            ? UpdateDetailContainer.LIST_SIZE
                + insertTabletStatementList.stream()
                    .mapToLong(InsertTabletStatement::calculateBytesUsed)
                    .reduce(0L, Long::sum)
            : 0);
  }

  @Override
  @TableModel
  public Optional<String> getDatabaseName() {
    Optional<String> database = Optional.empty();
    for (InsertTabletStatement insertTabletStatement : insertTabletStatementList) {
      Optional<String> childDatabaseName = insertTabletStatement.getDatabaseName();
      if (childDatabaseName.isPresent()
          && database.isPresent()
          && !Objects.equals(childDatabaseName.get(), database.get())) {
        throw new SemanticException(
            "Cannot insert into multiple databases within one statement, please split them manually");
      }

      database = childDatabaseName;
    }
    return database;
  }

  @Override
  public void removeAttributeColumns() {
    subRemoveAttributeColumns(Collections.emptyList());
  }

  @Override
  protected void subRemoveAttributeColumns(List<Integer> columnsToKeep) {
    insertTabletStatementList.forEach(InsertBaseStatement::removeAttributeColumns);
  }
}
