/*
 * 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.accumulo.server.util;

import static java.nio.charset.StandardCharsets.UTF_8;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.conf.PropertyType;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeExistsPolicy;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeMissingPolicy;
import org.apache.accumulo.server.client.HdfsZooInstance;
import org.apache.accumulo.server.zookeeper.ZooReaderWriter;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SystemPropUtil {
  private static final Logger log = LoggerFactory.getLogger(SystemPropUtil.class);

  public static boolean setSystemProperty(String property, String value) throws KeeperException, InterruptedException {
    if (!Property.isValidZooPropertyKey(property)) {
      IllegalArgumentException iae = new IllegalArgumentException("Zookeeper property is not mutable: " + property);
      log.debug("Attempted to set zookeeper property.  It is not mutable", iae);
      throw iae;
    }

    // Find the property taking prefix into account
    Property foundProp = null;
    for (Property prop : Property.values()) {
      if (PropertyType.PREFIX == prop.getType() && property.startsWith(prop.getKey()) || prop.getKey().equals(property)) {
        foundProp = prop;
        break;
      }
    }

    if ((foundProp == null || (foundProp.getType() != PropertyType.PREFIX && !foundProp.getType().isValidFormat(value)))) {
      IllegalArgumentException iae = new IllegalArgumentException("Ignoring property " + property + " it is either null or in an invalid format");
      log.debug("Attempted to set zookeeper property.  Value is either null or invalid", iae);
      throw iae;
    }

    // create the zk node for this property and set it's data to the specified value
    String zPath = ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZCONFIG + "/" + property;
    boolean result = ZooReaderWriter.getInstance().putPersistentData(zPath, value.getBytes(UTF_8), NodeExistsPolicy.OVERWRITE);

    return result;
  }

  public static void removeSystemProperty(String property) throws InterruptedException, KeeperException {
    String zPath = ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZCONFIG + "/" + property;
    ZooReaderWriter.getInstance().recursiveDelete(zPath, NodeMissingPolicy.FAIL);
  }
}