/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.apache.logging.log4j.audit.service.controller;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.springframework.data.rest.webmvc.support.ExceptionMessage;
  import org.springframework.http.HttpHeaders;
  import org.springframework.http.HttpStatus;
  import org.springframework.http.ResponseEntity;
  import org.springframework.web.bind.annotation.ControllerAdvice;
  import org.springframework.web.bind.annotation.ExceptionHandler;
  import org.springframework.web.bind.annotation.ResponseBody;
  import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
  
  @ControllerAdvice
  public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
      private static final Logger LOGGER = LogManager.getLogger();
  
      @ExceptionHandler({ Exception.class })
      @ResponseBody
      public ResponseEntity<?> handleAnyException(Exception e) {
          if (e instanceof IllegalArgumentException) {
              return new ResponseEntity(e.getMessage(), HttpStatus.BAD_REQUEST);
          } else if (e instanceof IllegalStateException) {
              return new ResponseEntity(e.getMessage(), HttpStatus.CONFLICT);
          }
          return errorResponse(e, HttpStatus.INTERNAL_SERVER_ERROR);
      }
  
      protected ResponseEntity<ExceptionMessage> errorResponse(Throwable throwable,
                                                               HttpStatus status) {
          if (null != throwable) {
              LOGGER.error("error caught: " + throwable.getMessage(), throwable);
              return response(new ExceptionMessage(throwable), status);
          } else {
              LOGGER.error("unknown error caught in RESTController, {}", status);
              return response(null, status);
          }
      }
  
      protected <T> ResponseEntity<T> response(T body, HttpStatus status) {
          LOGGER.debug("Responding with a status of {}", status);
          return new ResponseEntity<>(body, new HttpHeaders(), status);
      }
  }