/*
    * Copyright 2018 LINE Corporation
    *
    * LINE Corporation 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:
    *
    *   https://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 com.linecorp.centraldogma.server.internal.api.converter;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.base.Strings.isNullOrEmpty;
  
  import java.lang.reflect.ParameterizedType;
  
  import javax.annotation.Nullable;
  
  import com.fasterxml.jackson.databind.JsonNode;
  
  import com.linecorp.armeria.common.AggregatedHttpRequest;
  import com.linecorp.armeria.server.ServiceRequestContext;
  import com.linecorp.armeria.server.annotation.JacksonRequestConverterFunction;
  import com.linecorp.armeria.server.annotation.RequestConverterFunction;
  import com.linecorp.centraldogma.internal.Jackson;
  import com.linecorp.centraldogma.internal.api.v1.CommitMessageDto;
  
  /**
   * A request converter that converts to {@link CommitMessageDto}.
   */
  public final class CommitMessageRequestConverter implements RequestConverterFunction {
  
      private final JacksonRequestConverterFunction delegate = new JacksonRequestConverterFunction();
  
      @Override
      public CommitMessageDto convertRequest(
              ServiceRequestContext ctx, AggregatedHttpRequest request, Class<?> expectedResultType,
              @Nullable ParameterizedType expectedParameterizedResultType) throws Exception {
  
          if (expectedResultType == CommitMessageDto.class) {
              final JsonNode node = (JsonNode) delegate.convertRequest(ctx, request, JsonNode.class, null);
              if (node == null || node.get("commitMessage") == null) {
                  throw new IllegalArgumentException("commitMessage should be non-null.");
              }
  
              return convertCommitMessage(node.get("commitMessage"));
          }
          return RequestConverterFunction.fallthrough();
      }
  
      private static CommitMessageDto convertCommitMessage(JsonNode jsonNode) {
          final CommitMessageDto commitMessage = Jackson.convertValue(jsonNode, CommitMessageDto.class);
          checkArgument(!isNullOrEmpty(commitMessage.summary()), "summary should be non-null");
          return commitMessage;
      }
  }