// @flow
import Metrics from "../logging/metrics";

export default class Tracing {
  onLoadDocument({
    documentName,
    instance,
  }: {
    documentName: string,
    instance: any,
  }) {
    Metrics.increment("collaboration.load_document", { documentName });

    Metrics.gaugePerInstance(
      "collaboration.documents_count",
      instance.getDocumentsCount()
    );
  }

  onAuthenticationFailed({ documentName }: { documentName: string }) {
    Metrics.increment("collaboration.authentication_failed", { documentName });
  }

  onConnect({
    documentName,
    instance,
  }: {
    documentName: string,
    instance: any,
  }) {
    Metrics.increment("collaboration.connect", { documentName });
    Metrics.gaugePerInstance(
      "collaboration.connections_count",
      instance.getConnectionsCount()
    );
  }

  onDisconnect({
    documentName,
    instance,
  }: {
    documentName: string,
    instance: any,
  }) {
    Metrics.increment("collaboration.disconnect", { documentName });
    Metrics.gaugePerInstance(
      "collaboration.connections_count",
      instance.getConnectionsCount()
    );

    Metrics.gaugePerInstance(
      "collaboration.documents_count",
      // -1 adjustment because hook is called before document is removed
      instance.getDocumentsCount() - 1
    );
  }

  onChange({ documentName }: { documentName: string }) {
    Metrics.increment("collaboration.change", { documentName });
  }

  onDestroy() {
    Metrics.gaugePerInstance("collaboration.connections_count", 0);
    Metrics.gaugePerInstance("collaboration.documents_count", 0);
  }
}