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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you 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 co.elastic.apm.opentracing;

import io.opentracing.Scope;
import io.opentracing.ScopeManager;
import io.opentracing.Span;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

class ApmScopeManager implements ScopeManager {

    @Deprecated
    public ApmScope activate(@Nonnull Span span, boolean finishSpanOnClose) {
        final ApmSpan apmSpan = (ApmSpan) span;
        final Object traceContext = apmSpan.context().getTraceContext();
        if (traceContext != null) {
            // prevents other threads from concurrently setting ApmSpan.dispatcher to null
            // we can't synchronize on the internal span object, as it might be finished already
            // we can't synchronize on the ApmSpan, as ApmScopeManager.active() returns a different instance than ApmScopeManager.activate(Span)
            synchronized (traceContext) {
                // apmSpan.getSpan() has to be called within the synchronized block to avoid race conditions,
                // so we can't do the synchronization in ScopeManagerInstrumentation
                doActivate(apmSpan.getSpan(), traceContext);
            }
        }
        return new ApmScope(finishSpanOnClose, apmSpan);
    }

    private void doActivate(@Nullable Object span, Object traceContext) {
        // implementation is injected at runtime via co.elastic.apm.agent.opentracingimpl.ScopeManagerInstrumentation
    }

    @Override
    public Scope activate(Span span) {
        return activate(span, false);
    }

    @Deprecated
    @Nullable
    public ApmScope active() {
        final ApmSpan apmSpan = activeApmSpan();
        if (apmSpan != null) {
            return new ApmScope(false, apmSpan);
        }
        return null;
    }

    @Override
    public Span activeSpan() {
        return activeApmSpan();
    }

    private ApmSpan activeApmSpan() {
        final Object span = getCurrentSpan();
        ApmSpan apmSpan = null;
        if (span != null) {
            apmSpan = new ApmSpan(span);
        } else {
            final Object traceContext = getCurrentTraceContext();
            if (traceContext != null) {
                apmSpan = new ApmSpan(new TraceContextSpanContext(traceContext));
            }
        }

        return apmSpan;
    }

    @Nullable
    private Object getCurrentSpan() {
        // implementation is injected at runtime via co.elastic.apm.agent.opentracingimpl.ScopeManagerInstrumentation
        return null;
    }

    @Nullable
    private Object getCurrentTraceContext() {
        // implementation is injected at runtime via co.elastic.apm.agent.opentracingimpl.ScopeManagerInstrumentation
        return null;
    }
}