/*
 * 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.execution.status;

import org.apache.streampipes.model.message.PipelineStatusMessage;

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

public class PipelineStatusManager {

  private static final Map<String, List<PipelineStatusMessage>> pipelineStatusMessages = new HashMap<>();

  public static void addPipelineStatus(String pipelineId, PipelineStatusMessage message) {
    if (isInitialized(pipelineId)) {
      pipelineStatusMessages.get(pipelineId).add(message);
    } else {
      List<PipelineStatusMessage> statusMessageList = new ArrayList<>();
      statusMessageList.add(message);
      pipelineStatusMessages.put(pipelineId, statusMessageList);
    }

  }

  private static boolean isInitialized(String pipelineId) {
    return pipelineStatusMessages.containsKey(pipelineId);
  }

  public static List<PipelineStatusMessage> getPipelineStatus(String pipelineId) {
    if (!isInitialized(pipelineId)) {
      return new ArrayList<>();
    } else {
      return pipelineStatusMessages.get(pipelineId);
    }
  }

  public static List<PipelineStatusMessage> getPipelineStatus(String pipelineId, int numberOfLatestEntries) {
    List<PipelineStatusMessage> messages = getPipelineStatus(pipelineId);
    int statusMessageCount = messages.size();
    if (statusMessageCount <= numberOfLatestEntries) {
      return messages;
    } else {
      return messages.subList(messages.size() - numberOfLatestEntries, messages.size());
    }
  }
}
