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/*
 * Copyright 2017-2022 original 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.micronaut.tracing.opentelemetry.processing;

import io.micronaut.aop.InterceptorBinding;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.inject.annotation.TypedAnnotationTransformer;
import io.micronaut.inject.visitor.VisitorContext;
import io.micronaut.tracing.annotation.NewSpan;
import io.opentelemetry.instrumentation.annotations.WithSpan;

import java.util.Collections;
import java.util.List;

/**
 * Adds interceptor binding to {@link WithSpan} and adds {@link NewSpan} to it.
 *
 * @author Nemanja Mikic
 * @since 4.2.0
 */
public class WithSpanAnnotationTransformer implements TypedAnnotationTransformer {

    @Override
    public Class annotationType() {
        return WithSpan.class;
    }

    @Override
    public List> transform(AnnotationValue annotation, VisitorContext visitorContext) {
        AnnotationValue interceptBinding = AnnotationValue.builder(InterceptorBinding.class)
            .build();

        AnnotationValue newSpan = AnnotationValue.builder(NewSpan.class)
            .stereotype(interceptBinding)
            .value(annotation.stringValue().orElse(null))
            .build();

        return Collections.singletonList(newSpan);
    }
}