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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 zipkin2.server.internal.rabbitmq;

import java.net.URISyntaxException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.type.AnnotatedTypeMetadata;
import zipkin2.collector.CollectorMetrics;
import zipkin2.collector.CollectorSampler;
import zipkin2.collector.rabbitmq.RabbitMQCollector;
import zipkin2.storage.StorageComponent;

/** Auto-configuration for {@link RabbitMQCollector}. */
@Configuration
@Conditional(ZipkinRabbitMQCollectorConfiguration.RabbitMQAddressesOrUriSet.class)
@EnableConfigurationProperties(ZipkinRabbitMQCollectorProperties.class)
public class ZipkinRabbitMQCollectorConfiguration {

  @Bean(initMethod = "start")
  RabbitMQCollector rabbitMq(
      ZipkinRabbitMQCollectorProperties properties,
      CollectorSampler sampler,
      CollectorMetrics metrics,
      StorageComponent storage)
      throws NoSuchAlgorithmException, KeyManagementException, URISyntaxException {
    return properties.toBuilder().sampler(sampler).metrics(metrics).storage(storage).build();
  }

  /**
   * This condition passes when {@link ZipkinRabbitMQCollectorProperties#getAddresses()} or {@link
   * ZipkinRabbitMQCollectorProperties#getUri()} is set to a non-empty value.
   *
   * This is here because the yaml defaults this property to empty like this, and Spring Boot
   * doesn't have an option to treat empty properties as unset.
   *
   * 
{@code
   * addresses: ${RABBIT_ADDRESSES:}
   * uri: ${RABBIT_URI:}
   * }
   */
  static final class RabbitMQAddressesOrUriSet implements Condition {
    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata a) {
      return !isEmpty(context.getEnvironment().getProperty("zipkin.collector.rabbitmq.addresses"))
          || !isEmpty(context.getEnvironment().getProperty("zipkin.collector.rabbitmq.uri"));
    }

    private static boolean isEmpty(String s) {
      return s == null || s.isEmpty();
    }
  }
}