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/*
 * Copyright 2014-2022 Netflix, 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 com.netflix.spectator.metrics5;

import com.netflix.spectator.api.AbstractRegistry;
import com.netflix.spectator.api.Clock;
import com.netflix.spectator.api.Counter;
import com.netflix.spectator.api.DistributionSummary;
import com.netflix.spectator.api.Gauge;
import com.netflix.spectator.api.Id;
import com.netflix.spectator.api.Tag;
import com.netflix.spectator.api.Timer;

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

import io.dropwizard.metrics5.MetricName;

/** Registry implementation that maps spectator types to the metrics5 library. */
public class MetricsRegistry extends AbstractRegistry {

  private final io.dropwizard.metrics5.MetricRegistry impl;
  private final Map registeredGauges;

  /** Create a new instance. */
  public MetricsRegistry() {
    this(Clock.SYSTEM, new io.dropwizard.metrics5.MetricRegistry());
  }

  /** Create a new instance. */
  public MetricsRegistry(Clock clock, io.dropwizard.metrics5.MetricRegistry impl) {
    super(clock);
    this.impl = impl;
    this.registeredGauges = new ConcurrentHashMap<>();
  }

  @Override protected Counter newCounter(Id id) {
    return new MetricsCounter(clock(), id, impl.meter(toMetricName(id)));
  }

  @Override protected DistributionSummary newDistributionSummary(Id id) {
    return new MetricsDistributionSummary(clock(), id, impl.histogram(toMetricName(id)));
  }

  @Override protected Timer newTimer(Id id) {
    return new MetricsTimer(clock(), id, impl.timer(toMetricName(id)));
  }

  @Override protected Gauge newGauge(Id id) {
    final MetricName name = toMetricName(id);
    DoubleGauge gauge = registeredGauges.computeIfAbsent(name, n -> {
      DoubleGauge g = new DoubleGauge();
      impl.register(name, g);
      return g;
    });
    return new MetricsGauge(clock(), id, gauge);
  }

  @Override protected Gauge newMaxGauge(Id id) {
    final MetricName name = toMetricName(id);
    DoubleGauge gauge = registeredGauges.computeIfAbsent(name, n -> {
      DoubleMaxGauge g = new DoubleMaxGauge();
      impl.register(name, g);
      return g;
    });
    return new MetricsGauge(clock(), id, gauge);
  }

  private static MetricName toMetricName(final Id id) {
    return new MetricName(id.name(), buildTagMap(id));
  }

  private static Map buildTagMap(final Id id) {
    Map result = new HashMap<>();
    for (Tag tag : id.tags()) {
      result.put(tag.key(), tag.value());
    }
    return result;
  }

}