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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.center.client;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

/**
 * This event is fired when configuration changed of config center.
 */
public class ConfigCenterConfigurationChangedEvent {
  private final Map added;

  private final Map deleted;

  private final Map updated;

  private Set changed;

  private ConfigCenterConfigurationChangedEvent(Map added, Map updated,
      Map deleted) {
    this.added = added;
    this.deleted = deleted;
    this.updated = updated;
    this.changed = new HashSet<>();
    this.changed.addAll(added.keySet());
    this.changed.addAll(updated.keySet());
    this.changed.addAll(deleted.keySet());
  }

  public static ConfigCenterConfigurationChangedEvent createIncremental(Map latest,
      Map last) {
    Map itemsCreated = new HashMap<>();
    Map itemsDeleted = new HashMap<>();
    Map itemsModified = new HashMap<>();

    for (Map.Entry entry : latest.entrySet()) {
      String itemKey = entry.getKey();
      if (!last.containsKey(itemKey)) {
        itemsCreated.put(itemKey, entry.getValue());
      } else if (!Objects.equals(last.get(itemKey), latest.get(itemKey))) {
        itemsModified.put(itemKey, entry.getValue());
      }
    }
    for (String itemKey : last.keySet()) {
      if (!latest.containsKey(itemKey)) {
        itemsDeleted.put(itemKey, null);
      }
    }
    ConfigCenterConfigurationChangedEvent event = ConfigCenterConfigurationChangedEvent
        .createIncremental(itemsCreated, itemsModified, itemsDeleted);
    return event;
  }

  public static ConfigCenterConfigurationChangedEvent createIncremental(Map added,
      Map updated,
      Map deleted) {
    return new ConfigCenterConfigurationChangedEvent(added, updated, deleted);
  }

  public static ConfigCenterConfigurationChangedEvent createIncremental(Map updated) {
    return new ConfigCenterConfigurationChangedEvent(new HashMap<>(), updated, new HashMap<>());
  }

  public final Map getAdded() {
    return added;
  }


  public final Map getUpdated() {
    return updated;
  }


  public final Map getDeleted() {
    return deleted;
  }

  public final Set getChanged() {
    return changed;
  }
}