/*
    * Copyright 2019-2020 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.web.reactive;
  
  import lombok.extern.slf4j.Slf4j;
  import org.bremersee.web.CorsProperties;
  import org.bremersee.web.CorsProperties.CorsConfiguration;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
  import org.springframework.boot.context.event.ApplicationReadyEvent;
  import org.springframework.boot.context.properties.EnableConfigurationProperties;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.event.EventListener;
  import org.springframework.lang.NonNull;
  import org.springframework.util.ClassUtils;
  import org.springframework.web.reactive.config.CorsRegistry;
  import org.springframework.web.reactive.config.WebFluxConfigurer;
  
  /**
   * The cors auto configuration.
   *
   * @author Christian Bremer
   */
  @ConditionalOnWebApplication(type = Type.REACTIVE)
  @EnableConfigurationProperties(CorsProperties.class)
  @Configuration
  @Slf4j
  public class CorsAutoConfiguration implements WebFluxConfigurer {
  
    private final CorsProperties properties;
  
    /**
     * Instantiates a new cors auto configuration.
     *
     * @param properties the cors properties
     */
    public CorsAutoConfiguration(CorsProperties properties) {
      this.properties = properties;
    }
  
    /**
     * Init.
     */
    @EventListener(ApplicationReadyEvent.class)
    public void init() {
      log.info("\n"
              + "*********************************************************************************\n"
              + "* {}\n"
              + "*********************************************************************************\n"
              + "* properties = {}\n"
              + "*********************************************************************************",
          ClassUtils.getUserClass(getClass()).getSimpleName(), properties);
    }
  
    @SuppressWarnings("DuplicatedCode")
    @Override
    public void addCorsMappings(@NonNull CorsRegistry corsRegistry) {
      if (!properties.isEnable()) {
        return;
      }
      for (CorsConfiguration config : properties.getConfigs()) {
        corsRegistry.addMapping(config.getPathPattern())
            .allowedOrigins(config.getAllowedOrigins().toArray(new String[0]))
            .allowedMethods(config.getAllowedMethods().toArray(new String[0]))
            .allowedHeaders(config.getAllowedHeaders().toArray(new String[0]))
            .exposedHeaders(config.getExposedHeaders().toArray(new String[0]))
            .maxAge(config.getMaxAge())
            .allowCredentials(config.isAllowCredentials());
      }
    }
  
  }