/*
 * 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.metadata.template;

import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.commons.schema.template.Template;
import org.apache.iotdb.db.queryengine.plan.statement.Statement;
import org.apache.iotdb.db.queryengine.plan.statement.StatementType;
import org.apache.iotdb.db.queryengine.plan.statement.StatementVisitor;
import org.apache.iotdb.db.schemaengine.template.ClusterTemplateManager;

import org.apache.tsfile.utils.Pair;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class BatchActivateTemplateStatement extends Statement {

  private final List<PartialPath> devicePathList;

  public BatchActivateTemplateStatement(List<PartialPath> devicePathList) {
    super();
    this.devicePathList = devicePathList;
    statementType = StatementType.BATCH_ACTIVATE_TEMPLATE;
  }

  @Override
  public List<PartialPath> getPaths() {
    ClusterTemplateManager clusterTemplateManager = ClusterTemplateManager.getInstance();
    List<String> templatePaths = new ArrayList<>();
    for (PartialPath path : devicePathList) {
      Pair<Template, PartialPath> templateSetInfo =
          clusterTemplateManager.checkTemplateSetInfo(path);
      if (templateSetInfo == null) {
        continue;
      }
      templatePaths.addAll(templateSetInfo.left.getSchemaMap().keySet());
    }
    return devicePathList.stream()
        .flatMap(path -> templatePaths.stream().map(path::concatAsMeasurementPath))
        .collect(Collectors.toList());
  }

  public List<PartialPath> getDevicePathList() {
    return devicePathList;
  }

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