/*
    * Copyright 2022 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;
  
  import static java.util.Objects.nonNull;
  import static org.springframework.http.MediaType.APPLICATION_JSON;
  import static org.springframework.http.MediaType.APPLICATION_XML;
  import static org.springframework.http.MediaType.TEXT_PLAIN;
  import static org.springframework.http.MediaType.TEXT_XML;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.Optional;
  import lombok.Getter;
  import org.springframework.http.MediaType;
  
  /**
   * The rest api response type.
   *
   * @author Christian Bremer
   */
  @Getter
  public enum RestApiResponseType {
  
    /**
     * Json rest api response type.
     */
    JSON(APPLICATION_JSON, MediaType.APPLICATION_JSON_VALUE),
  
    /**
     * Xml rest api response type.
     */
    XML(APPLICATION_XML, MediaType.APPLICATION_XML_VALUE),
  
    /**
     * Header rest api response type.
     */
    HEADER(TEXT_PLAIN, MediaType.TEXT_PLAIN_VALUE);
  
    private static final MediaType APPLICATION_PLUS_JSON = new MediaType("application", "*+json");
  
    private static final MediaType APPLICATION_PLUS_XML = new MediaType("application", "*+xml");
  
    private final MediaType contentType;
  
    private final String contentTypeValue;
  
    RestApiResponseType(MediaType contentType, String contentTypeValue) {
      this.contentType = contentType;
      this.contentTypeValue = contentTypeValue;
    }
  
    /**
     * Detect rest api response type by accept header.
     *
     * @param accepted the accepted
     * @return the rest api response content type
     */
    public static RestApiResponseType detectByAccepted(List<MediaType> accepted) {
      RestApiResponseType contentType;
      if (isJsonAccepted(accepted)) {
        contentType = JSON;
      } else if (isXmlAccepted(accepted)) {
        contentType = XML;
      } else {
        contentType = HEADER;
      }
      return contentType;
    }
  
    /**
     * Detect rest api response type by content type.
     *
     * @param contentType the content type
     * @return the rest api response type
     */
    public static RestApiResponseType detectByContentType(MediaType contentType) {
      if (isJson(contentType)) {
        return JSON;
      }
      if (isXml(contentType)) {
        return XML;
      }
      return HEADER;
    }
 
   private static boolean isJson(MediaType contentType) {
     return nonNull(contentType)
         && (contentType.isCompatibleWith(APPLICATION_JSON)
         || contentType.isCompatibleWith(APPLICATION_PLUS_JSON));
   }
 
   private static boolean isJsonAccepted(List<MediaType> accepted) {
     return Optional.ofNullable(accepted)
         .stream()
         .flatMap(Collection::stream)
         .anyMatch(mediaType -> mediaType.includes(APPLICATION_JSON)
             || APPLICATION_PLUS_JSON.includes(mediaType)
             || mediaType.includes(TEXT_PLAIN));
   }
 
   private static boolean isXml(MediaType contentType) {
     return nonNull(contentType)
         && (contentType.isCompatibleWith(APPLICATION_XML)
         || contentType.isCompatibleWith(APPLICATION_PLUS_XML)
         || TEXT_XML.isCompatibleWith(contentType));
   }
 
   private static boolean isXmlAccepted(List<MediaType> accepted) {
     return Optional.ofNullable(accepted)
         .stream()
         .flatMap(Collection::stream)
         .anyMatch(mediaType -> mediaType.includes(APPLICATION_XML)
             || APPLICATION_PLUS_XML.includes(mediaType)
             || mediaType.includes(TEXT_XML));
   }
 
 }