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/**
 * Copyright 2022 the original author or authors.
 *
 * 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
 *
 * https://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 io.micrometer.tracing.brave.bridge;

import brave.Tracing;
import brave.baggage.BaggageField;
import brave.internal.baggage.BaggageFields;
import brave.propagation.TraceContextOrSamplingFlags;
import io.micrometer.tracing.Span;
import io.micrometer.tracing.TraceContext;
import io.micrometer.tracing.propagation.Propagator;

import java.util.List;

/**
 * Brave implementation of a {@link Propagator}.
 *
 * @author Marcin Grzejszczak
 * @since 1.0.0
 */
public class BravePropagator implements Propagator {

    private final Tracing tracing;

    /**
     * Creates a new instance of {@link BravePropagator}.
     * @param tracing Brave tracing
     */
    public BravePropagator(Tracing tracing) {
        this.tracing = tracing;
    }

    @Override
    public List fields() {
        return this.tracing.propagation().keys();
    }

    @Override
    public  void inject(TraceContext traceContext, C carrier, Setter setter) {
        this.tracing.propagation().injector(setter::set).inject(BraveTraceContext.toBrave(traceContext), carrier);
    }

    @Override
    public  Span.Builder extract(C carrier, Getter getter) {
        TraceContextOrSamplingFlags extract = this.tracing.propagation().extractor(getter::get).extract(carrier);
        updateExistingBaggageFieldsWithUpdatedValues(extract);
        return BraveSpanBuilder.toBuilder(this.tracing.tracer(), extract);
    }

    private void updateExistingBaggageFieldsWithUpdatedValues(TraceContextOrSamplingFlags extract) {
        if (extract.context() == null) {
            return;
        }
        List