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/**
 * Copyright 2015-2016 The OpenZipkin 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 zipkin.collector.scribe;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.List;
import java.util.stream.Collectors;
import zipkin.Codec;
import zipkin.collector.Collector;
import zipkin.collector.CollectorMetrics;
import zipkin.internal.Nullable;
import zipkin.storage.Callback;

final class ScribeSpanConsumer implements Scribe {
  final Collector collector;
  final CollectorMetrics metrics;
  final String category;

  public ScribeSpanConsumer(ScribeCollector.Builder builder) {
    this.collector = builder.delegate.build();
    this.metrics = builder.metrics;
    this.category = builder.category;
  }

  @Override
  public ListenableFuture log(List messages) {
    metrics.incrementMessages();
    List thrifts;
    try {
      thrifts = messages.stream()
          .filter(m -> m.category.equals(category))
          .map(m -> m.message.getBytes(StandardCharsets.ISO_8859_1))
          .map(b -> Base64.getMimeDecoder().decode(b)) // finagle-zipkin uses mime encoding
          .collect(Collectors.toList());
    } catch (RuntimeException e) {
      metrics.incrementMessagesDropped();
      return Futures.immediateFailedFuture(e);
    }

    SettableFuture result = SettableFuture.create();
    collector.acceptSpans(thrifts, Codec.THRIFT, new Callback() {
      @Override public void onSuccess(@Nullable Void value) {
        result.set(ResultCode.OK);
      }

      @Override public void onError(Throwable t) {
        result.setException(t);
      }
    });
    return result;
  }
}