/*
 * 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 org.apache.beam.runners.twister2.translators.batch;

import edu.iu.dsc.tws.api.tset.sets.batch.BatchTSet;
import java.io.IOException;
import org.apache.beam.runners.core.construction.CreatePCollectionViewTranslation;
import org.apache.beam.runners.twister2.Twister2BatchTranslationContext;
import org.apache.beam.runners.twister2.translators.BatchTransformTranslator;
import org.apache.beam.runners.twister2.translators.functions.ByteToWindowFunctionPrimitive;
import org.apache.beam.runners.twister2.translators.functions.MapToTupleFunction;
import org.apache.beam.sdk.coders.Coder;
import org.apache.beam.sdk.coders.KvCoder;
import org.apache.beam.sdk.runners.AppliedPTransform;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.transforms.View;
import org.apache.beam.sdk.transforms.windowing.WindowFn;
import org.apache.beam.sdk.util.WindowedValue;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.WindowingStrategy;

/** PCollectionView translator. */
@SuppressWarnings({
  "rawtypes" // TODO(https://issues.apache.org/jira/browse/BEAM-10556)
})
public class PCollectionViewTranslatorBatch<ElemT, ViewT>
    implements BatchTransformTranslator<View.CreatePCollectionView<ElemT, ViewT>> {
  @Override
  public void translateNode(
      View.CreatePCollectionView<ElemT, ViewT> transform, Twister2BatchTranslationContext context) {
    BatchTSet<WindowedValue<ElemT>> inputDataSet =
        context.getInputDataSet(context.getInput(transform));
    @SuppressWarnings("unchecked")
    AppliedPTransform<
            PCollection<ElemT>,
            PCollection<ElemT>,
            PTransform<PCollection<ElemT>, PCollection<ElemT>>>
        application =
            (AppliedPTransform<
                    PCollection<ElemT>,
                    PCollection<ElemT>,
                    PTransform<PCollection<ElemT>, PCollection<ElemT>>>)
                context.getCurrentTransform();
    org.apache.beam.sdk.values.PCollectionView<ViewT> input;
    PCollection<ElemT> inputPCol = context.getInput(transform);
    final KvCoder coder = (KvCoder) inputPCol.getCoder();
    Coder inputKeyCoder = coder.getKeyCoder();
    WindowingStrategy windowingStrategy = inputPCol.getWindowingStrategy();
    WindowFn windowFn = windowingStrategy.getWindowFn();
    final WindowedValue.WindowedValueCoder wvCoder =
        WindowedValue.FullWindowedValueCoder.of(coder.getValueCoder(), windowFn.windowCoder());
    BatchTSet<WindowedValue<ElemT>> inputGathered =
        inputDataSet
            .direct()
            .map(new MapToTupleFunction<>(inputKeyCoder, wvCoder))
            .allGather()
            .map(new ByteToWindowFunctionPrimitive(inputKeyCoder, wvCoder));
    try {
      input = CreatePCollectionViewTranslation.getView(application);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
    context.setSideInputDataSet(input.getTagInternal().getId(), inputGathered);
  }
}