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/**
 * Copyright 2017-2019 The OpenTracing 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.opentracing.contrib.spring.rabbitmq;

import io.opentracing.Tracer;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.context.annotation.Lazy;
import org.springframework.util.Assert;

/**
 * Auto-configuration for RabbitMq tracing.
 *
 * @author Gilles Robert
 */
@Configuration
@AutoConfigureAfter(RabbitAutoConfiguration.class)
@ConditionalOnClass({Message.class, RabbitTemplate.class})
@ConditionalOnBean(Tracer.class)
@ConditionalOnProperty(name = "opentracing.spring.rabbitmq.enabled", havingValue = "true", matchIfMissing = true)
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class RabbitMqTracingAutoConfiguration {

  @Autowired @Lazy private Tracer tracer;

  @Bean
  /**
   * If RabbitTemplate bean isn't defined, tracing outgoing AMQP messages isn't done automatically,
   * but incoming AMQP messages are still traced automatically via {@link #rabbitMqBeanPostProcessor(RabbitMqReceiveTracingInterceptor)}
   */
  @ConditionalOnBean(RabbitTemplate.class)
  public RabbitMqSendTracingAspect rabbitMqSendTracingAspect(
      RabbitTemplate rabbitTemplate, RabbitMqSpanDecorator spanDecorator) {
    Assert.notNull(
        rabbitTemplate.getMessageConverter(), "RabbitTemplate has no message converter configured");
    return new RabbitMqSendTracingAspect(tracer, rabbitTemplate.getExchange(), rabbitTemplate.getMessageConverter(), spanDecorator);
  }

  @Bean
  public RabbitMqReceiveTracingInterceptor rabbitMqReceiveTracingInterceptor(RabbitMqSpanDecorator spanDecorator) {
    return new RabbitMqReceiveTracingInterceptor(tracer, spanDecorator);
  }

  @Bean
  public RabbitMqBeanPostProcessor rabbitMqBeanPostProcessor(RabbitMqReceiveTracingInterceptor interceptor) {
    return new RabbitMqBeanPostProcessor(interceptor);
  }

  @Bean
  @ConditionalOnMissingBean(RabbitMqSpanDecorator.class)
  public RabbitMqSpanDecorator rabbitMqSpanDecorator() {
    return new RabbitMqSpanDecorator();
  }

}