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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.Span;
import io.opentracing.log.Fields;
import io.opentracing.tag.Tag;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.Map;

class ApmSpan implements Span {

    private final TraceContextSpanContext spanContext;

    @Nullable
    // co.elastic.apm.agent.impl.transaction.AbstractSpan in case of unfinished spans
    private volatile Object dispatcher;

    ApmSpan(@Nullable Object dispatcher) {
        this.dispatcher = dispatcher;
        this.spanContext = new TraceContextSpanContext(getTraceContext(dispatcher));
    }

    ApmSpan(@Nonnull TraceContextSpanContext spanContext) {
        this.spanContext = spanContext;
    }

    @Nullable
    private Object getTraceContext(@Nullable Object dispatcher) {
        // co.elastic.apm.agent.opentracingimpl.ApmSpanInstrumentation$GetTraceContextInstrumentation
        return null;
    }

    @Override
    public TraceContextSpanContext context() {
        return spanContext;
    }

    @Override
    public ApmSpan setTag(String key, String value) {
        handleTag(key, value);
        return this;
    }

    @Override
    public ApmSpan setTag(String key, boolean value) {
        handleTag(key, value);
        return this;
    }

    @Override
    public ApmSpan setTag(String key, Number value) {
        handleTag(key, value);
        return this;
    }

    @Override
    public  Span setTag(Tag tag, T value) {
        handleTag(tag.getKey(), value);
        return this;
    }

    @Override
    public ApmSpan setOperationName(String operationName) {
        // co.elastic.apm.agent.opentracingimpl.ApmSpanInstrumentation$SetOperationName
        return this;
    }

    @Override
    public void finish() {
        finish(-1);
    }

    @Override
    public void finish(long finishMicros) {
        if (spanContext != null) {
            final Object traceContext = spanContext.getTraceContext();
            if (traceContext != null) {
                // prevents race conditions with ScopeManager#activate(Span)
                synchronized (traceContext) {
                    finishInternal(finishMicros, traceContext);
                }
            }
        }
    }

    private void finishInternal(long finishMicros, Object traceContext) {
        // implementation injected at runtime by co.elastic.apm.agent.opentracingimpl.ApmSpanInstrumentation.FinishInstrumentation.finishInternal
    }

    @Nullable
    Object getSpan() {
        return dispatcher;
    }

    @Override
    public ApmSpan log(String event) {
        log(Collections.singletonMap(Fields.EVENT, event));
        return this;
    }

    @Override
    public ApmSpan log(Map fields) {
        return log(-1, fields);
    }

    @Override
    public ApmSpan log(long timestampMicroseconds, String event) {
        log(timestampMicroseconds, Collections.singletonMap(Fields.EVENT, event));
        return this;
    }

    @Override
    public ApmSpan log(long timestampMicroseconds, Map fields) {
        // co.elastic.apm.agent.opentracingimpl.ApmSpanInstrumentation.LogInstrumentation
        return this;
    }

    @Override
    public ApmSpan setBaggageItem(String key, String value) {
        return this;
    }

    @Override
    @Nullable
    public String getBaggageItem(String key) {
        for (Map.Entry baggage : context().baggageItems()) {
            if (baggage.getKey().equals(key)) {
                return baggage.getValue();
            }
        }
        return null;
    }

    private void handleTag(String key, @Nullable Object value) {
        // implementation injected at runtime by co.elastic.apm.agent.opentracingimpl.ApmSpanInstrumentation.TagInstrumentation.handleTag
    }

    @Override
    public String toString() {
        return String.valueOf(dispatcher);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ApmSpan otherSpan = (ApmSpan) o;
        return otherSpan.context().toSpanId().equals(spanContext.toSpanId());
    }

    @Override
    public int hashCode() {
        return spanContext.toSpanId().hashCode();
    }
}