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/*
 * Copyright 2015-2019 The OpenZipkin 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 zipkin2.server.internal;

import brave.Tracing;
import io.micrometer.core.instrument.MeterRegistry;
import java.util.List;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
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.server.internal.brave.TracingStorageComponent;
import zipkin2.server.internal.throttle.ThrottledStorageComponent;
import zipkin2.server.internal.throttle.ZipkinStorageThrottleProperties;
import zipkin2.storage.InMemoryStorage;
import zipkin2.storage.StorageComponent;

/** Base collector and storage configurations needed for higher-level integrations */
@Configuration
public class ZipkinConfiguration {

  @Bean CollectorSampler traceIdSampler(@Value("${zipkin.collector.sample-rate:1.0}") float rate) {
    return CollectorSampler.create(rate);
  }

  @Bean CollectorMetrics metrics(MeterRegistry registry) {
    return new MicrometerCollectorMetrics(registry);
  }

  @Configuration
  @EnableConfigurationProperties(ZipkinStorageThrottleProperties.class)
  @ConditionalOnThrottledStorage
  static class ThrottledStorageComponentEnhancer implements BeanPostProcessor, BeanFactoryAware {
    @Autowired(required = false)
    Tracing tracing;

    /**
     * Need this to resolve cyclic instantiation issue with spring.  Mostly, this is for
     * MeterRegistry as really bad things happen if you try to Autowire it (loss of JVM metrics) but
     * also using it for properties just to make sure no cycles exist at all as a result of turning
     * throttling on.
     *
     * Ref: Tracking down cause of Spring's "not
     * eligible for auto-proxying"
     */
    private BeanFactory beanFactory;

    @Override public Object postProcessAfterInitialization(Object bean, String beanName) {
      if (bean instanceof StorageComponent) {
        ZipkinStorageThrottleProperties throttleProperties =
          beanFactory.getBean(ZipkinStorageThrottleProperties.class);
        return new ThrottledStorageComponent((StorageComponent) bean,
          beanFactory.getBean(MeterRegistry.class),
          tracing,
          throttleProperties.getMinConcurrency(),
          throttleProperties.getMaxConcurrency(),
          throttleProperties.getMaxQueueSize());
      }
      return bean;
    }

    @Override public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
      this.beanFactory = beanFactory;
    }
  }

  @Configuration
  @ConditionalOnSelfTracing
  static class TracingStorageComponentEnhancer implements BeanPostProcessor {

    @Autowired(required = false)
    Tracing tracing;

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) {
      return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) {
      if (tracing == null) return bean;
      if (bean instanceof StorageComponent) {
        return new TracingStorageComponent(tracing, (StorageComponent) bean);
      }
      return bean;
    }
  }

  /**
   * This is a special-case configuration if there's no StorageComponent of any kind. In-Mem can
   * supply both read apis, so we add two beans here.
   */
  @Configuration
  @Conditional(StorageTypeMemAbsentOrEmpty.class)
  @ConditionalOnMissingBean(StorageComponent.class)
  static class InMemoryConfiguration {
    @Bean
    StorageComponent storage(
      @Value("${zipkin.storage.strict-trace-id:true}") boolean strictTraceId,
      @Value("${zipkin.storage.search-enabled:true}") boolean searchEnabled,
      @Value("${zipkin.storage.mem.max-spans:500000}") int maxSpans,
      @Value("${zipkin.storage.autocomplete-keys:}") List autocompleteKeys) {
      return InMemoryStorage.newBuilder()
        .strictTraceId(strictTraceId)
        .searchEnabled(searchEnabled)
        .maxSpanCount(maxSpans)
        .autocompleteKeys(autocompleteKeys)
        .build();
    }
  }

  static final class StorageTypeMemAbsentOrEmpty implements Condition {
    @Override
    public boolean matches(ConditionContext condition, AnnotatedTypeMetadata ignored) {
      String storageType = condition.getEnvironment().getProperty("zipkin.storage.type");
      if (storageType == null) return true;
      storageType = storageType.trim();
      if (storageType.isEmpty()) return true;
      return storageType.equals("mem");
    }
  }
}