/*
    * Copyright 2019-2026 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.comparator.spring.web;
  
  import static java.util.Objects.isNull;
  
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import org.bremersee.comparator.model.SortOrder;
  import org.springframework.core.MethodParameter;
  import org.springframework.lang.NonNull;
  import org.springframework.lang.Nullable;
  import org.springframework.util.StringUtils;
  import org.springframework.web.bind.support.WebDataBinderFactory;
  import org.springframework.web.context.request.NativeWebRequest;
  import org.springframework.web.method.support.HandlerMethodArgumentResolver;
  import org.springframework.web.method.support.ModelAndViewContainer;
  import org.springframework.web.util.UriUtils;
  
  /**
   * The sort order handler method argument resolver.
   *
   * @author Christian Bremer
   */
  public class SortOrderHandlerMethodArgumentResolver
      extends SortOrderHandlerMethodArgumentResolverSupport
      implements HandlerMethodArgumentResolver {
  
    /**
     * Instantiates a new sort order handler method argument resolver.
     */
    public SortOrderHandlerMethodArgumentResolver() {
      super();
    }
  
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
      return SortOrder.class.equals(parameter.getParameterType());
    }
  
    @Nullable
    @Override
    public SortOrder resolveArgument(
        @NonNull MethodParameter parameter,
        @Nullable ModelAndViewContainer mavContainer,
        @NonNull NativeWebRequest webRequest,
        @Nullable WebDataBinderFactory binderFactory) {
  
      String[] rawParameterValues = webRequest.getParameterValues(getParameterName(parameter));
  
      // No parameter
      if (isNull(rawParameterValues) || rawParameterValues.length == 0) {
        return getDefaultFromAnnotationOrFallback(parameter);
      }
  
      // Single empty parameter, e.g "sort="
      if (rawParameterValues.length == 1 && !StringUtils.hasText(rawParameterValues[0])) {
        return getDefaultFromAnnotationOrFallback(parameter);
      }
  
      var decoded = Arrays.stream(rawParameterValues)
          .map(it -> UriUtils.decode(it, StandardCharsets.UTF_8))
          .toList();
  
      return parseParameterValues(decoded);
    }
  }