class Sentry::Metrics::LocalAggregator

def add(key, value)
  if @buckets[key]
    @buckets[key].add(value)
  else
    @buckets[key] = GaugeMetric.new(value)
  end
end

def deserialize_tags(tags)
  tags.inject({}) do |h, tag|
    k, v = tag
    old = h[k]
    # make it an array if key repeats
    h[k] = old ? (old.is_a?(Array) ? old << v : [old, v]) : v
    h
  end
end

def initialize
  @buckets = {}
end

def to_hash
  return nil if @buckets.empty?
  @buckets.map do |bucket_key, metric|
    type, key, unit, tags = bucket_key
    payload_key = "#{type}:#{key}@#{unit}"
    payload_value = {
      tags: deserialize_tags(tags),
      min: metric.min,
      max: metric.max,
      count: metric.count,
      sum: metric.sum
    }
    [payload_key, payload_value]
  end.to_h
end