/*
   * Copyright 2019-2026 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
    *
    *      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 org.bremersee.exception.spring.boot.autoconfigure.reactive;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.bremersee.exception.RestApiExceptionMapper;
  import org.bremersee.exception.spring.boot.autoconfigure.RestApiExceptionMapperBootProperties;
  import org.springframework.beans.factory.ObjectProvider;
  import org.springframework.boot.autoconfigure.AutoConfiguration;
  import org.springframework.boot.autoconfigure.AutoConfigureAfter;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
  import org.springframework.boot.autoconfigure.web.WebProperties;
  import org.springframework.boot.context.event.ApplicationReadyEvent;
  import org.springframework.boot.context.properties.EnableConfigurationProperties;
  import org.springframework.boot.webflux.error.ErrorAttributes;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.event.EventListener;
  import org.springframework.core.annotation.Order;
  import org.springframework.http.codec.ServerCodecConfigurer;
  import org.springframework.util.Assert;
  import org.springframework.util.ClassUtils;
  
  /**
   * The api exception handler autoconfiguration.
   *
   * @author Christian Bremer
   */
  @ConditionalOnWebApplication(type = Type.REACTIVE)
  @ConditionalOnClass(name = {
      "tools.jackson.databind.ObjectMapper",
      "org.bremersee.exception.RestApiExceptionMapper"
  })
  @ConditionalOnBean({
      ErrorAttributes.class,
      WebProperties.class,
      ServerCodecConfigurer.class
  })
  @AutoConfigureAfter({
      RestApiExceptionMapperForWebFluxAutoConfiguration.class
  })
  @AutoConfiguration
  @EnableConfigurationProperties({RestApiExceptionMapperBootProperties.class})
  public class ApiExceptionHandlerAutoConfiguration {
  
    private static final Log log = LogFactory.getLog(ApiExceptionHandlerAutoConfiguration.class);
  
    private final RestApiExceptionMapperBootProperties properties;
  
    /**
     * Instantiates a new api exception handler autoconfiguration.
     *
     * @param properties the properties
     */
    public ApiExceptionHandlerAutoConfiguration(
        RestApiExceptionMapperBootProperties properties) {
      this.properties = properties;
    }
  
    /**
     * Init.
     */
    @EventListener(ApplicationReadyEvent.class)
    public void init() {
      log.info(String.format("""
              
              *********************************************************************************
              * %s
              *********************************************************************************
              * apiPaths = %s
              *********************************************************************************""",
          ClassUtils.getUserClass(getClass()).getSimpleName(),
          properties.getApiPaths()));
    }
  
    /**
     * Builds api exception handler bean.
     *
     * @param errorAttributes the error attributes
     * @param webProperties the web properties
     * @param applicationContext the application context
    * @param serverCodecConfigurer the server codec configurer
    * @param restApiExceptionMapper the rest api exception mapper
    * @return the api exception handler bean
    */
   @Bean
   @Order(-2) // to have a higher priority than DefaultErrorWebExceptionHandler
   public ApiExceptionHandler apiExceptionHandler(
       ObjectProvider<ErrorAttributes> errorAttributes,
       ObjectProvider<WebProperties> webProperties,
       ApplicationContext applicationContext,
       ObjectProvider<ServerCodecConfigurer> serverCodecConfigurer,
       ObjectProvider<RestApiExceptionMapper> restApiExceptionMapper) {
 
     Assert.notNull(
         errorAttributes.getIfAvailable(),
         "Error attributes must be present.");
     Assert.notNull(
         serverCodecConfigurer.getIfAvailable(),
         "Server codec configurer must be present.");
     Assert.notNull(
         restApiExceptionMapper.getIfAvailable(),
         "Rest api exception mapper must be present.");
 
     return new ApiExceptionHandler(
         properties.getApiPaths(),
         errorAttributes.getIfAvailable(),
         webProperties.getIfAvailable(WebProperties::new).getResources(),
         applicationContext,
         serverCodecConfigurer.getIfAvailable(),
         restApiExceptionMapper.getIfAvailable());
   }
 
 }