/*
 * 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.geode.management.internal.cli.functions;

import java.util.HashMap;
import java.util.Map;

import org.apache.logging.log4j.Logger;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.CacheFactory;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionContext;
import org.apache.geode.internal.InternalEntity;
import org.apache.geode.internal.logging.LogService;

/**
 * 
 * @since GemFire 8.0
 */

public class MembersForRegionFunction implements Function, InternalEntity {
  private static final Logger logger = LogService.getLogger();

  private static final long serialVersionUID = 8746830191680509335L;

  private static final String ID = MembersForRegionFunction.class.getName();

  @Override
  public void execute(FunctionContext context) {
    Map<String, String> resultMap = new HashMap<String, String>();
    try {
      Cache cache = CacheFactory.getAnyInstance();
      String memberNameOrId = cache.getDistributedSystem().getDistributedMember().getId();
      Object args = (Object) context.getArguments();
      String regionName = ((String) args);
      Region<Object, Object> region = cache.getRegion(regionName);

      if (region != null) {
        resultMap.put(memberNameOrId, "" + region.getAttributes().getScope().isLocal());
      } else {
        String regionWithPrefix = Region.SEPARATOR + regionName;
        region = cache.getRegion(regionWithPrefix);
        if (region != null) {
          resultMap.put(memberNameOrId, "" + region.getAttributes().getScope().isLocal());
        } else {
          resultMap.put("", "");
        }
      }
      context.getResultSender().lastResult(resultMap);
    } catch (Exception ex) {
      Cache cache = CacheFactory.getAnyInstance();
      logger.info("MembersForRegionFunction exception {}", ex.getMessage(), ex);
      resultMap.put("", "");
      context.getResultSender().lastResult(resultMap);
    }
  }

  @Override
  public String getId() {
    return MembersForRegionFunction.ID;
  }

  @Override
  public boolean isHA() {
    return false;
  }

  @Override
  public boolean hasResult() {
    return true;
  }

  @Override
  public boolean optimizeForWrite() {
    return false;
  }

}