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/*
 * Copyright 2017-2019 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 com.google.cloud.spring.autoconfigure.logging;

import com.google.cloud.logging.logback.LoggingAppender;
import com.google.cloud.spring.autoconfigure.trace.StackdriverTraceAutoConfiguration;
import com.google.cloud.spring.logging.LoggingWebMvcConfigurer;
import com.google.cloud.spring.logging.TraceIdLoggingWebMvcInterceptor;
import com.google.cloud.spring.logging.extractors.CloudTraceIdExtractor;
import com.google.cloud.spring.logging.extractors.TraceIdExtractor;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * This class configures a Web MVC interceptor to capture trace IDs for log correlation. This
 * configuration is turned on only if Trace support is not used and Web MVC is used. Otherwise, the
 * MDC context will be used by the Logback appenders.
 */
@AutoConfiguration
@ConditionalOnClass({HandlerInterceptor.class, LoggingAppender.class, TraceIdExtractor.class})
@ConditionalOnMissingBean(name = "stackdriverTracingCustomizer")
@AutoConfigureAfter(StackdriverTraceAutoConfiguration.class)
@ConditionalOnWebApplication(type = Type.SERVLET)
@ConditionalOnProperty(value = "spring.cloud.gcp.logging.enabled", matchIfMissing = true)
@Import(LoggingWebMvcConfigurer.class)
public class StackdriverLoggingAutoConfiguration {

  @Bean
  @ConditionalOnMissingBean
  public TraceIdLoggingWebMvcInterceptor loggingWebMvcInterceptor(TraceIdExtractor extractor) {
    return new TraceIdLoggingWebMvcInterceptor(extractor);
  }

  @Bean
  @ConditionalOnMissingBean
  public TraceIdExtractor traceIdExtractor() {
    return new CloudTraceIdExtractor();
  }
}