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/*
 * Copyright 2017-2020 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
 *
 * 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 io.micronaut.configuration.rabbitmq.bind;

import io.micronaut.configuration.rabbitmq.serdes.RabbitMessageSerDesRegistry;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.type.Argument;
import io.micronaut.messaging.annotation.Body;

import javax.inject.Singleton;
import java.util.Optional;

/**
 * Binds an argument of with the {@link Body} annotation from the {@link RabbitConsumerState}.
 *
 * @author James Kleeh
 * @since 1.1.0
 */
@Singleton
public class RabbitBodyBinder implements RabbitAnnotatedArgumentBinder {

    private final RabbitMessageSerDesRegistry serDesRegistry;

    /**
     * Default constructor.
     *
     * @param serDesRegistry The registry to get a deserializer
     */
    public RabbitBodyBinder(RabbitMessageSerDesRegistry serDesRegistry) {
        this.serDesRegistry = serDesRegistry;
    }

    @Override
    public Class getAnnotationType() {
        return Body.class;
    }

    @Override
    public BindingResult bind(ArgumentConversionContext context, RabbitConsumerState messageState) {
        Argument bodyType = context.getArgument();
        Optional message = serDesRegistry.findSerdes(bodyType)
                .map(serDes -> serDes.deserialize(messageState, bodyType));

        return () -> message;
    }
}