/*
 * Copyright 2017-2020 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 org.springframework.cloud.stream.config;

import java.util.List;
import java.util.stream.Collectors;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.cloud.stream.converter.CompositeMessageConverterFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Role;
import org.springframework.integration.context.IntegrationContextUtils;
import org.springframework.messaging.converter.CompositeMessageConverter;
import org.springframework.messaging.converter.MessageConverter;

/**
 * @author Vinicius Carvalho
 * @author Artem Bilan
 * @author Oleg Zhurakousky
 */
@Configuration(proxyBeanMethods = false)
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
class ContentTypeConfiguration {

	@Bean(name = IntegrationContextUtils.ARGUMENT_RESOLVER_MESSAGE_CONVERTER_BEAN_NAME)
	public CompositeMessageConverter configurableCompositeMessageConverter(
			ObjectProvider<ObjectMapper> objectMapperObjectProvider,
			List<MessageConverter> customMessageConverters) {

		customMessageConverters = customMessageConverters.stream()
				.filter(c -> isConverterEligible(c)).collect(Collectors.toList());

		CompositeMessageConverterFactory factory =
				new CompositeMessageConverterFactory(customMessageConverters, objectMapperObjectProvider.getIfAvailable(ObjectMapper::new));

		return factory.getMessageConverterForAllRegistered();
	}

	/*
	 * We want to filter out all non-stream MessageConverters, given that other
	 * auto-configurations may interfere with their MessageConverters.
	 */
	private boolean isConverterEligible(Object messageConverter) {
		String messageConverterName = messageConverter.getClass().getName();
		if (messageConverterName.startsWith("org.springframework.cloud.")) {
			return true;
		}
		else if (!messageConverterName.startsWith("org.springframework.")) {
			return true;
		}
		return false;
	}
}
