// @flow
import metrics from "datadog-metrics";

if (process.env.DD_API_KEY) {
  metrics.init({
    apiKey: process.env.DD_API_KEY,
    prefix: "outline.",
    defaultTags: [`env:${process.env.DD_ENV || process.env.NODE_ENV}`],
  });
}

export function gauge(
  key: string,
  value: number,
  tags?: { [string]: string }
): void {
  if (!process.env.DD_API_KEY) {
    return;
  }

  return metrics.gauge(key, value, tags);
}

export function gaugePerInstance(
  key: string,
  value: number,
  tags?: { [string]: string } = {}
): void {
  if (!process.env.DD_API_KEY) {
    return;
  }

  return metrics.gauge(key, value, {
    ...tags,
    instance: process.env.INSTANCE_ID || process.env.HEROKU_DYNO_ID,
  });
}

export function increment(key: string, tags?: { [string]: string }): void {
  if (!process.env.DD_API_KEY) {
    return;
  }

  return metrics.increment(key, tags);
}