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/*
 * Copyright 2012-2023 The Feign 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 feign.moshi;

import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.JsonDataException;
import com.squareup.moshi.Moshi;
import feign.Response;
import feign.Util;
import feign.codec.Decoder;
import okio.BufferedSource;
import okio.Okio;
import java.io.IOException;
import java.lang.reflect.Type;

public class MoshiDecoder implements Decoder {
  private final Moshi moshi;

  public MoshiDecoder(Moshi moshi) {
    this.moshi = moshi;
  }

  public MoshiDecoder() {
    this.moshi = new Moshi.Builder().build();
  }

  public MoshiDecoder(Iterable> adapters) {
    this(MoshiFactory.create(adapters));
  }

  @Override
  public Object decode(Response response, Type type) throws IOException {
    JsonAdapter jsonAdapter = moshi.adapter(type);

    if (response.status() == 404 || response.status() == 204)
      return Util.emptyValueOf(type);
    if (response.body() == null)
      return null;

    try (BufferedSource source = Okio.buffer(Okio.source(response.body().asInputStream()))) {
      if (source.exhausted()) {
        return null; // empty body
      }
      return jsonAdapter.fromJson(source);
    } catch (JsonDataException e) {
      if (e.getCause() != null && e.getCause() instanceof IOException) {
        throw (IOException) e.getCause();
      }
      throw e;
    }
  }

}