/*
    * 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.apiclient.webflux.contract.spring;
  
  import java.util.Arrays;
  import java.util.function.Function;
  import org.bremersee.apiclient.webflux.Invocation;
  import org.springframework.http.MediaType;
  import org.springframework.web.bind.annotation.DeleteMapping;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.PatchMapping;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.PutMapping;
  import org.springframework.web.bind.annotation.RequestMapping;
  
  /**
   * The accept resolver.
   *
   * @author Christian Bremer
   */
  public class AcceptResolver implements Function<Invocation, MediaType> {
  
    @Override
    public MediaType apply(Invocation invocation) {
      return Arrays.stream(
              invocation.findAnnotationValueOnMethod(
                      RequestMapping.class, a -> a.produces().length > 0, RequestMapping::produces)
                  .or(() -> invocation.findAnnotationValueOnMethod(
                      GetMapping.class, a -> a.produces().length > 0, GetMapping::produces))
                  .or(() -> invocation.findAnnotationValueOnMethod(
                      PostMapping.class, a -> a.produces().length > 0, PostMapping::produces))
                  .or(() -> invocation.findAnnotationValueOnMethod(
                      PutMapping.class, a -> a.produces().length > 0, PutMapping::produces))
                  .or(() -> invocation.findAnnotationValueOnMethod(
                      PatchMapping.class, a -> a.produces().length > 0, PatchMapping::produces))
                  .or(() -> invocation.findAnnotationValueOnMethod(
                      DeleteMapping.class, a -> a.produces().length > 0, DeleteMapping::produces))
                  .orElse(new String[0]))
          .map(this::parseMediaType)
          .findFirst()
          .orElse(MediaType.ALL);
    }
  
    /**
     * Parse media type.
     *
     * @param mediaType the media type
     * @return the media type (can be {@code null}
     */
    protected MediaType parseMediaType(String mediaType) {
      try {
        return MediaType.parseMediaType(mediaType);
      } catch (RuntimeException ignored) {
        return null;
      }
    }
  }