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// Copyright (C) 2015 The Android Open Source Project
//
// 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.google.gerrit.metrics.dropwizard;

import com.codahale.metrics.Counter;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.Meter;
import com.codahale.metrics.Metric;
import com.codahale.metrics.Snapshot;
import com.codahale.metrics.Timer;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.gerrit.metrics.Description;
import com.google.gerrit.metrics.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

class MetricJson {
  String description;
  String unit;
  Boolean constant;
  Boolean rate;
  Boolean gauge;
  Boolean cumulative;

  Long count;
  Object value;

  Double rate_1m;
  Double rate_5m;
  Double rate_15m;
  Double rate_mean;

  Double p50;
  Double p75;
  Double p95;
  Double p98;
  Double p99;
  Double p99_9;

  Double min;
  Double avg;
  Double max;
  Double sum;
  Double std_dev;

  List fields;
  Map buckets;

  MetricJson(Metric metric, ImmutableMap atts, boolean dataOnly) {
    if (!dataOnly) {
      description = atts.get(Description.DESCRIPTION);
      unit = atts.get(Description.UNIT);
      constant = toBool(atts, Description.CONSTANT);
      rate = toBool(atts, Description.RATE);
      gauge = toBool(atts, Description.GAUGE);
      cumulative = toBool(atts, Description.CUMULATIVE);
    }
    init(metric, atts);
  }

  private void init(Metric metric, ImmutableMap atts) {
    if (metric instanceof BucketedMetric) {
      BucketedMetric m = (BucketedMetric) metric;
      if (m.getTotal() != null) {
        init(m.getTotal(), atts);
      }

      Field[] fieldList = m.getFields();
      fields = new ArrayList<>(fieldList.length);
      for (Field f : fieldList) {
        fields.add(new FieldJson(f));
      }
      buckets = makeBuckets(fieldList, m.getCells(), atts);

    } else if (metric instanceof Counter) {
      Counter c = (Counter) metric;
      count = c.getCount();

    } else if (metric instanceof Gauge) {
      Gauge g = (Gauge) metric;
      value = g.getValue();

    } else if (metric instanceof Meter) {
      Meter m = (Meter) metric;
      count = m.getCount();
      rate_1m = m.getOneMinuteRate();
      rate_5m = m.getFiveMinuteRate();
      rate_15m = m.getFifteenMinuteRate();

    } else if (metric instanceof Timer) {
      Timer m = (Timer) metric;
      Snapshot s = m.getSnapshot();
      count = m.getCount();
      rate_1m = m.getOneMinuteRate();
      rate_5m = m.getFiveMinuteRate();
      rate_15m = m.getFifteenMinuteRate();

      double div = Description.getTimeUnit(atts.get(Description.UNIT)).toNanos(1);
      p50 = s.getMedian() / div;
      p75 = s.get75thPercentile() / div;
      p95 = s.get95thPercentile() / div;
      p98 = s.get98thPercentile() / div;
      p99 = s.get99thPercentile() / div;
      p99_9 = s.get999thPercentile() / div;

      min = s.getMin() / div;
      max = s.getMax() / div;
      std_dev = s.getStdDev() / div;

    } else if (metric instanceof Histogram) {
      Histogram m = (Histogram) metric;
      Snapshot s = m.getSnapshot();
      count = m.getCount();

      p50 = s.getMedian();
      p75 = s.get75thPercentile();
      p95 = s.get95thPercentile();
      p98 = s.get98thPercentile();
      p99 = s.get99thPercentile();
      p99_9 = s.get999thPercentile();

      min = (double) s.getMin();
      avg = (double) s.getMean();
      max = (double) s.getMax();
      sum = s.getMean() * m.getCount();
      std_dev = s.getStdDev();
    }
  }

  private static Boolean toBool(ImmutableMap atts, String key) {
    return Description.TRUE_VALUE.equals(atts.get(key)) ? true : null;
  }

  @SuppressWarnings("unchecked")
  private static Map makeBuckets(
      Field[] fields, Map metrics, ImmutableMap atts) {
    if (fields.length == 1) {
      Function fmt = (Function) fields[0].formatter();
      Map out = new TreeMap<>();
      for (Map.Entry e : metrics.entrySet()) {
        out.put(fmt.apply(e.getKey()), new MetricJson(e.getValue(), atts, true));
      }
      return out;
    }

    Map out = new TreeMap<>();
    for (Map.Entry e : metrics.entrySet()) {
      ImmutableList