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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.instrumentation.test.server.http;

import io.opentelemetry.context.propagation.TextMapGetter;
import io.opentelemetry.testing.internal.armeria.server.ServiceRequestContext;
import io.opentelemetry.testing.internal.io.netty.util.AsciiString;
import java.util.Collections;
import java.util.stream.Collectors;
import javax.annotation.Nullable;

public enum RequestContextGetter implements TextMapGetter {
  INSTANCE;

  @Override
  public Iterable keys(@Nullable ServiceRequestContext carrier) {
    if (carrier == null) {
      return Collections.emptyList();
    }
    return carrier.request().headers().names().stream()
        .map(AsciiString::toString)
        .collect(Collectors.toList());
  }

  @Override
  @Nullable
  public String get(@Nullable ServiceRequestContext carrier, String key) {
    if (carrier == null) {
      return null;
    }
    return carrier.request().headers().get(key);
  }
}