/*
 * 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.solr.handler.dataimport;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Properties;

import org.apache.solr.common.cloud.SolrZkClient;
import org.apache.zookeeper.KeeperException.NodeExistsException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ZKPropertiesWriter implements DIHPropertiesWriter {
  
  private static final Logger log = LoggerFactory
      .getLogger(ZKPropertiesWriter.class);
  
  private String path;
  private SolrZkClient zkClient;
  
  @Override
  public void init(DataImporter dataImporter) {
    String collection = dataImporter.getCore().getCoreDescriptor()
        .getCloudDescriptor().getCollectionName();
    String persistFilename;
    if(dataImporter.getHandlerName() != null){
      persistFilename = dataImporter.getHandlerName() + ".properties";
    } else {
      persistFilename = SimplePropertiesWriter.IMPORTER_PROPERTIES;
    }
    path = "/configs/" + collection + "/" + persistFilename;
    zkClient = dataImporter.getCore().getCoreDescriptor().getCoreContainer()
        .getZkController().getZkClient();
  }
  
  @Override
  public boolean isWritable() {
    return true;
  }
  
  @Override
  public void persist(Properties props) {
    Properties existing = readIndexerProperties();
    existing.putAll(props);
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    try {
      existing.store(output, "");
      byte[] bytes = output.toByteArray();
      if (!zkClient.exists(path, false)) {
        try {
          zkClient.makePath(path, false);
        } catch (NodeExistsException e) {}
      }
      zkClient.setData(path, bytes, false);
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      log.warn(
          "Could not persist properties to " + path + " :" + e.getClass(), e);
    } catch (Exception e) {
      log.warn(
          "Could not persist properties to " + path + " :" + e.getClass(), e);
    }
  }
  
  @Override
  public Properties readIndexerProperties() {
    Properties props = new Properties();
    try {
      byte[] data = zkClient.getData(path, null, null, false);
      if (data != null) {
        ByteArrayInputStream input = new ByteArrayInputStream(data);
        props.load(input);
      }
    } catch (Throwable e) {
      log.warn(
          "Could not read DIH properties from " + path + " :" + e.getClass(), e);
    }
    return props;
  }
}