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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.sidecar;

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.Meter;
import com.netflix.spectator.api.Registry;
import com.netflix.spectator.api.Tag;
import com.netflix.spectator.api.TagList;
import com.netflix.spectator.api.Timer;
import com.netflix.spectator.api.patterns.PolledMeter;

import java.io.Closeable;
import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Registry for reporting data to 
 * SpectatorD.
 */
public final class SidecarRegistry implements Registry, Closeable {

  private final Clock clock;
  private final TagList commonTags;
  private final SidecarWriter writer;

  private final ConcurrentHashMap state;

  /** Create a new instance. */
  public SidecarRegistry(Clock clock, SidecarConfig config) {
    this(clock, config, SidecarWriter.create(config.outputLocation()));
  }

  /** Create a new instance. */
  SidecarRegistry(Clock clock, SidecarConfig config, SidecarWriter writer) {
    this.clock = clock;
    this.commonTags = TagList.create(config.commonTags());
    this.writer = writer;
    this.state = new ConcurrentHashMap<>();
  }

  /**
   * Stop the scheduler reporting data.
   */
  @Override public void close() throws IOException {
    writer.close();
    state.clear();
  }

  @Override
  public Clock clock() {
    return clock;
  }

  @Override
  public Id createId(String name) {
    return Id.create(name);
  }

  @Override
  public Id createId(String name, Iterable tags) {
    return Id.create(name).withTags(tags);
  }

  @Deprecated
  @Override
  public void register(Meter meter) {
    PolledMeter.monitorMeter(this, meter);
  }

  @Override
  public ConcurrentMap state() {
    return state;
  }

  private Id mergeCommonTags(Id id) {
    return commonTags.size() == 0 ? id : id.withTags(commonTags);
  }

  @Override
  public Counter counter(Id id) {
    return new SidecarCounter(mergeCommonTags(id), writer);
  }

  @Override
  public DistributionSummary distributionSummary(Id id) {
    return new SidecarDistributionSummary(mergeCommonTags(id), writer);
  }

  @Override
  public Timer timer(Id id) {
    return new SidecarTimer(mergeCommonTags(id), clock, writer);
  }

  @Override
  public Gauge gauge(Id id) {
    return new SidecarGauge(mergeCommonTags(id), writer);
  }

  @Override
  public Gauge maxGauge(Id id) {
    return new SidecarMaxGauge(mergeCommonTags(id), writer);
  }

  @Override
  public Meter get(Id id) {
    return null;
  }

  @Override
  public Iterator iterator() {
    return Collections.emptyIterator();
  }
}