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/*
 * 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.servicecomb.config.zookeeper;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.servicecomb.config.ConfigurationChangedEvent;
import org.apache.servicecomb.config.DynamicPropertiesSource;
import org.apache.servicecomb.foundation.common.event.EventManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MapPropertySource;

public class ZookeeperDynamicPropertiesSource implements DynamicPropertiesSource {
  public static final String SOURCE_NAME = "zookeeper";

  private static final Logger LOGGER = LoggerFactory.getLogger(ZookeeperDynamicPropertiesSource.class);

  private final Map valueCache = new ConcurrentHashMap<>();

  public ZookeeperDynamicPropertiesSource() {
  }

  private final UpdateHandler updateHandler = new UpdateHandler();

  private void init(Environment environment) {
    ZookeeperClient zookeeperClient = new ZookeeperClient(updateHandler, environment);
    try {
      zookeeperClient.refreshZookeeperConfig();
    } catch (Exception e) {
      throw new IllegalStateException("Set up zookeeper config failed.", e);
    }
  }

  public class UpdateHandler {
    public void handle(Map current, Map last) {
      ConfigurationChangedEvent event = ConfigurationChangedEvent.createIncremental(current, last);
      LOGGER.info("Dynamic configuration changed: {}", event.getChanged());
      valueCache.putAll(event.getAdded());
      valueCache.putAll(event.getUpdated());
      event.getDeleted().forEach((k, v) -> valueCache.remove(k));
      EventManager.post(event);
    }
  }

  @Override
  public MapPropertySource create(Environment environment) {
    init(environment);
    return new MapPropertySource(SOURCE_NAME, valueCache);
  }

  @Override
  public int getOrder() {
    return 0;
  }
}