/*
 * =========================================================================================
 * Copyright © 2013 the kamon project <http://kamon.io/>
 *
 * 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 kamon.newrelic

import kamon.metric.UserMetrics.UserMetricGroup
import kamon.metric._
import kamon.newrelic.Agent.Settings

object CustomMetricExtractor extends MetricExtractor {

  def extract(settings: Settings, collectionContext: CollectionContext, metrics: Map[MetricGroupIdentity, MetricGroupSnapshot]): Map[MetricID, MetricData] = {
    metrics.collect {
      case (mg: UserMetricGroup, groupSnapshot) ⇒
        groupSnapshot.metrics collect {
          case (name, snapshot) ⇒ Metric.fromKamonMetricSnapshot(snapshot, s"Custom/${mg.name}", None, Scale.Unit)
        }
    }.flatten.toMap
  }
}