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/*
 * Copyright Terracotta, Inc.
 *
 * Licensed 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.terracotta.management.stats;

import org.terracotta.management.Objects;
import org.terracotta.management.context.Context;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * This class holds the {@link Statistic} list quered from a specific context
 *
 * @author Mathieu Carbou
 */
public final class ContextualStatistics implements Iterable>, Serializable {

  private final Map> statistics;
  private final String capability;
  private final Context context;

  public ContextualStatistics(String capability, Context context, Map> statistics) {
    this.statistics = new HashMap>(Objects.requireNonNull(statistics));
    this.context = Objects.requireNonNull(context);
    this.capability = Objects.requireNonNull(capability);
  }

  public String getCapability() {
    return capability;
  }

  public int size() {return statistics.size();}

  public boolean isEmpty() {return statistics.isEmpty();}

  @Override
  public Iterator> iterator() {
    return statistics.values().iterator();
  }

  public Map> getStatistics() {
    return statistics;
  }

  /**
   * Returns the only possible statistic for a specific type
   *
   * @param type The type of the statistic to return
   * @param   The {@link Statistic} type
   * @return The statistic found
   * @throws NoSuchElementException If there is 0 or more than 1 statistic for given type
   */
  public > T getStatistic(Class type) throws NoSuchElementException {
    Map filtered = getStatistics(type);
    if (filtered.size() != 1) {
      throw new NoSuchElementException(type.getName());
    }
    return filtered.values().iterator().next();
  }

  /**
   * Returns the only possible statistic for a specific type and name
   *
   * @param type The type of the statistic to return
   * @param name The name of the statistic to return
   * @param   The {@link Statistic} type
   * @return The statistic found
   * @throws NoSuchElementException If there is 0 or more than 1 statistic for given type
   */
  public > T getStatistic(Class type, String name) throws NoSuchElementException {
    Map filtered = getStatistics(type);
    T stat = filtered.get(name);
    if (stat == null) {
      throw new NoSuchElementException(name + ":" + type.getName());
    }
    return stat;
  }

  public > Map getStatistics(Class type) {
    Map filtered = new LinkedHashMap();
    for (Map.Entry> entry : statistics.entrySet()) {
      if (type.isInstance(entry.getValue())) {
        filtered.put(entry.getKey(), type.cast(entry.getValue()));
      }
    }
    return filtered;
  }

  public Context getContext() {
    return context;
  }

  @Override
  public String toString() {
    return "ContextualStatistics{" + "capability='" + capability + '\'' +
        ", context=" + context +
        ", statistics=" + statistics +
        '}';
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    ContextualStatistics that = (ContextualStatistics) o;

    if (!statistics.equals(that.statistics)) return false;
    if (!capability.equals(that.capability)) return false;
    return context.equals(that.context);

  }

  @Override
  public int hashCode() {
    int result = statistics.hashCode();
    result = 31 * result + capability.hashCode();
    result = 31 * result + context.hashCode();
    return result;
  }

}