/*
    * 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.gbif.ws.client;
  
  import org.gbif.api.exception.ServiceUnavailableException;
  import org.gbif.ws.MethodNotAllowedException;
  import org.gbif.ws.NotFoundException;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.net.URI;
  import java.nio.charset.StandardCharsets;
  
  import javax.validation.ValidationException;
  
  import org.apache.commons.io.IOUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.security.access.AccessDeniedException;
  
  import feign.Response;
  import feign.codec.ErrorDecoder;
  
  public class ClientErrorDecoder implements ErrorDecoder {
  
    private static final Logger LOG = LoggerFactory.getLogger(ClientErrorDecoder.class);
  
    @Override
    public Exception decode(String methodKey, Response response) {
      String message = null;
  
      if (response.body() != null) {
        try (Reader reader = response.body().asReader(StandardCharsets.UTF_8)) {
          // Easy way to read the stream and get a String object
          message = IOUtils.toString(reader);
          LOG.error("Client exception: {}", message);
        } catch (IOException e) {
          LOG.error("Exception during reading client error response", e);
        }
      }
  
      switch (response.status()) {
        case 400:
          return new IllegalArgumentException("A bad request received");
        case 401:
          return new AccessDeniedException("Unauthorized request received");
        case 403:
          return new AccessDeniedException("Forbidden request received");
        case 404:
          return new NotFoundException("Resource not found", URI.create(response.request().url()));
        case 405:
          return new MethodNotAllowedException("Method not allowed to user");
        case 422:
          return message != null
              ? new ValidationException(extractValidationErrorMessage(message))
              : new ValidationException();
        case 500:
          return new ServiceUnavailableException(
              "An internal server error occurred, please try again later");
        case 501:
          return new UnsupportedOperationException(
              message != null ? message : "Method not implement yet");
        default:
          return new RuntimeException(message != null ? message : "Unexpected exception");
      }
    }
  
    private String extractValidationErrorMessage(String message) {
      return message.replace("<ul><li>", "").replace("</li></ul>", "").replace("<li></li>", ", ");
    }
  }