/*
    * Copyright 2012-2017 CodeLibs Project and the Others.
    *
    * 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.codelibs.fess.mylasta.direction.sponsor;
  
  import java.util.stream.Collectors;
  
  import org.codelibs.fess.app.web.api.ApiResult;
  import org.codelibs.fess.app.web.api.ApiResult.ApiErrorResponse;
  import org.codelibs.fess.app.web.api.ApiResult.Status;
  import org.dbflute.optional.OptionalThing;
  import org.lastaflute.web.api.ApiFailureHook;
  import org.lastaflute.web.api.ApiFailureResource;
  import org.lastaflute.web.login.exception.LoginUnauthorizedException;
  import org.lastaflute.web.response.ApiResponse;
  import org.lastaflute.web.response.JsonResponse;
  
  /**
   * @author jflute
   */
  public class FessApiFailureHook implements ApiFailureHook { // #change_it for handling API failure
  
      // ===================================================================================
      //                                                                          Definition
      //                                                                          ==========
      protected static final int HTTP_BAD_REQUEST = 400;
      protected static final int HTTP_UNAUTHORIZED = 401;
  
      // ===================================================================================
      //                                                                    Business Failure
      //                                                                    ================
      @Override
      public ApiResponse handleValidationError(final ApiFailureResource resource) {
          return asJson(createFailureBean(Status.BAD_REQUEST, createMessage(resource, null))).httpStatus(HTTP_BAD_REQUEST);
      }
  
      @Override
      public ApiResponse handleApplicationException(final ApiFailureResource resource, final RuntimeException cause) {
          if (cause instanceof LoginUnauthorizedException) {
              return asJson(createFailureBean(Status.UNAUTHORIZED, "Unauthorized request.")).httpStatus(HTTP_UNAUTHORIZED);
          } else {
              return asJson(createFailureBean(Status.BAD_REQUEST, createMessage(resource, cause))).httpStatus(HTTP_BAD_REQUEST);
          }
      }
  
      // ===================================================================================
      //                                                                      System Failure
      //                                                                      ==============
      @Override
      public OptionalThing<ApiResponse> handleClientException(final ApiFailureResource resource, final RuntimeException cause) {
          return OptionalThing.empty(); // means empty body (HTTP status will be automatically sent)
      }
  
      @Override
      public OptionalThing<ApiResponse> handleServerException(final ApiFailureResource resource, final Throwable cause) {
          return OptionalThing.empty(); // means empty body (HTTP status will be automatically sent)
      }
  
      // ===================================================================================
      //                                                                        Assist Logic
      //                                                                        ============
      protected JsonResponse<ApiResult> asJson(final ApiResult bean) {
          return new JsonResponse<>(bean);
      }
  
      protected ApiResult createFailureBean(final Status status, final String message) {
          return new ApiErrorResponse().message(message).status(status).result();
      }
  
      protected String createMessage(final ApiFailureResource resource, final RuntimeException cause) {
          if (!resource.getMessageList().isEmpty()) {
              return resource.getMessageList().stream().collect(Collectors.joining(" "));
          }
          if (cause != null) {
              return cause.getMessage();
          }
          return "Unknown error";
      }
  
  }