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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *     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 zipkin2.codec;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import zipkin2.DependencyLink;
import zipkin2.internal.JsonCodec;
import zipkin2.internal.JsonCodec.JsonReader;
import zipkin2.internal.JsonCodec.JsonReaderAdapter;
import zipkin2.internal.Nullable;
import zipkin2.internal.ReadBuffer;

public enum DependencyLinkBytesDecoder implements BytesDecoder {
  JSON_V1 {
    @Override public Encoding encoding() {
      return Encoding.JSON;
    }

    @Override public boolean decode(byte[] link, Collection out) {
      return JsonCodec.read(READER, ReadBuffer.wrap(link), out);
    }

    @Override @Nullable public DependencyLink decodeOne(byte[] link) {
      return JsonCodec.readOne(READER, ReadBuffer.wrap(link));
    }

    @Override public boolean decodeList(byte[] links, Collection out) {
      return JsonCodec.readList(READER, ReadBuffer.wrap(links), out);
    }

    @Override public List decodeList(byte[] links) {
      List out = new ArrayList<>();
      if (!decodeList(links, out)) return Collections.emptyList();
      return out;
    }
  };

  static final JsonReaderAdapter READER = new JsonReaderAdapter() {
    @Override public DependencyLink fromJson(JsonReader reader) throws IOException {
      DependencyLink.Builder result = DependencyLink.newBuilder();
      reader.beginObject();
      while (reader.hasNext()) {
        String nextName = reader.nextName();
        if (nextName.equals("parent")) {
          result.parent(reader.nextString());
        } else if (nextName.equals("child")) {
          result.child(reader.nextString());
        } else if (nextName.equals("callCount")) {
          result.callCount(reader.nextLong());
        } else if (nextName.equals("errorCount")) {
          result.errorCount(reader.nextLong());
        } else {
          reader.skipValue();
        }
      }
      reader.endObject();
      return result.build();
    }

    @Override public String toString() {
      return "DependencyLink";
    }
  };
}