/*
 * Copyright 2023 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.modulith.events.amqp;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.core.RabbitMessageOperations;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.context.expression.BeanFactoryResolver;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.modulith.events.EventExternalizationConfiguration;
import org.springframework.modulith.events.config.EventExternalizationAutoConfiguration;
import org.springframework.modulith.events.support.BrokerRouting;
import org.springframework.modulith.events.support.DelegatingEventExternalizer;

/**
 * Auto-configuration to set up a {@link DelegatingEventExternalizer} to externalize events to RabbitMQ.
 *
 * @author Oliver Drotbohm
 * @since 1.1
 */
@AutoConfiguration
@AutoConfigureAfter(EventExternalizationAutoConfiguration.class)
@ConditionalOnClass(RabbitTemplate.class)
class RabbitEventExternalizerConfiguration {

	private static final Logger logger = LoggerFactory.getLogger(RabbitEventExternalizerConfiguration.class);

	@Bean
	DelegatingEventExternalizer rabbitEventExternalizer(EventExternalizationConfiguration configuration,
			RabbitMessageOperations operations, BeanFactory factory) {

		logger.debug("Registering domain event externalization to RabbitMQ…");

		var context = new StandardEvaluationContext();
		context.setBeanResolver(new BeanFactoryResolver(factory));

		return new DelegatingEventExternalizer(configuration, (target, payload) -> {

			var routing = BrokerRouting.of(target, context);

			operations.convertAndSend(routing.getTarget(), routing.getKey(payload), payload);
		});
	}
}
