/*
 * 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 static org.apache.geode.distributed.ConfigurationProperties.*;

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

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Logger;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionContext;
import org.apache.geode.distributed.internal.DistributionConfig;
import org.apache.geode.internal.InternalEntity;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.logging.log4j.LogLevel;
import org.apache.geode.internal.logging.log4j.LogMarker;
import org.apache.geode.internal.logging.log4j.LogWriterLogger;


/**
 *
 * Class for change log level function
 *
 * since 8.0
 *
 */

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

  public static final String ID = ChangeLogLevelFunction.class.getName();
  private static final long serialVersionUID = 1L;

  @Override
  public void execute(FunctionContext context) {
    Cache cache = context.getCache();
    Map<String, String> result = new HashMap<String, String>();
    try {
      LogWriterLogger logwriterLogger = (LogWriterLogger) cache.getLogger();
      Object[] args = (Object[]) context.getArguments();
      final String logLevel = (String) args[0];
      Level log4jLevel = LogLevel.getLevel(logLevel);
      logwriterLogger.setLevel(log4jLevel);
      System.setProperty(DistributionConfig.GEMFIRE_PREFIX + LOG_LEVEL, logLevel);
      // LOG:CONFIG:
      logger.info(LogMarker.CONFIG, "GFSH Changed log level to {}", log4jLevel);
      result.put(cache.getDistributedSystem().getDistributedMember().getId(),
          "New log level is " + log4jLevel);
      context.getResultSender().lastResult(result);
    } catch (Exception ex) {
      // LOG:CONFIG:
      logger.info(LogMarker.CONFIG, "GFSH Changing log level exception {}", ex.getMessage(), ex);
      result.put(cache.getDistributedSystem().getDistributedMember().getId(),
          "ChangeLogLevelFunction exception " + ex.getMessage());
      context.getResultSender().lastResult(result);
    }
  }

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

  }

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

  @Override
  public boolean optimizeForWrite() {
    // no need of optimization since read-only.
    return false;
  }

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

}
