/*
 * 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.streampipes.manager.preview;

import org.apache.streampipes.model.base.NamedStreamPipesEntity;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;

public enum ActivePipelinePreviews {

  INSTANCE;

  private Map<String, List<NamedStreamPipesEntity>> activePreviews;

  ActivePipelinePreviews() {
    this.activePreviews = new HashMap<>();
  }

  public void addActivePreview(String previewId,
                               List<NamedStreamPipesEntity> activePreviews) {
    this.activePreviews.put(previewId, activePreviews);
  }

  public void removePreview(String previewId) {
    this.activePreviews.remove(previewId);
  }

  public List<NamedStreamPipesEntity> getInvocationGraphs(String previewId) {
    return this.activePreviews.get(previewId);
  }

  public Optional<NamedStreamPipesEntity> getInvocationGraphForPipelineELement(String previewId,
                                                       String pipelineElementDomId) {
    List<NamedStreamPipesEntity> graphs = this.activePreviews.get(previewId);

    if (graphs == null || graphs.size() == 0) {
      return Optional.empty();
    } else {
      return graphs
              .stream()
              .filter(g -> g.getDOM().equals(pipelineElementDomId))
              .findFirst();
    }
  }
}
