/*
 * 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.samza.util;

import java.io.IOException;
import org.apache.beam.model.pipeline.v1.RunnerApi;
import org.apache.beam.runners.core.construction.RehydratedComponents;
import org.apache.beam.runners.core.construction.WindowingStrategyTranslation;
import org.apache.beam.runners.core.construction.graph.PipelineNode;
import org.apache.beam.runners.core.construction.graph.QueryablePipeline;
import org.apache.beam.runners.fnexecution.wire.WireCoders;
import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
import org.apache.beam.sdk.util.WindowedValue;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.WindowingStrategy;
import org.apache.beam.vendor.grpc.v1p13p1.com.google.protobuf.InvalidProtocolBufferException;
import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterables;

/** Utilities for pipeline translation. */
public final class SamzaPipelineTranslatorUtils {
  private SamzaPipelineTranslatorUtils() {}

  public static WindowedValue.WindowedValueCoder instantiateCoder(
      String collectionId, RunnerApi.Components components) {
    PipelineNode.PCollectionNode collectionNode =
        PipelineNode.pCollection(collectionId, components.getPcollectionsOrThrow(collectionId));
    try {
      return (WindowedValue.WindowedValueCoder)
          WireCoders.instantiateRunnerWireCoder(collectionNode, components);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

  public static WindowingStrategy<?, BoundedWindow> getPortableWindowStrategy(
      PipelineNode.PTransformNode transform, QueryablePipeline pipeline) {
    String inputId = Iterables.getOnlyElement(transform.getTransform().getInputsMap().values());
    RehydratedComponents rehydratedComponents =
        RehydratedComponents.forComponents(pipeline.getComponents());

    RunnerApi.WindowingStrategy windowingStrategyProto =
        pipeline
            .getComponents()
            .getWindowingStrategiesOrThrow(
                pipeline.getComponents().getPcollectionsOrThrow(inputId).getWindowingStrategyId());

    WindowingStrategy<?, ?> windowingStrategy;
    try {
      windowingStrategy =
          WindowingStrategyTranslation.fromProto(windowingStrategyProto, rehydratedComponents);
    } catch (InvalidProtocolBufferException e) {
      throw new IllegalStateException(
          String.format(
              "Unable to hydrate GroupByKey windowing strategy %s.", windowingStrategyProto),
          e);
    }

    @SuppressWarnings("unchecked")
    WindowingStrategy<?, BoundedWindow> ret =
        (WindowingStrategy<?, BoundedWindow>) windowingStrategy;
    return ret;
  }

  /**
   * Escape the non-alphabet chars in the name so we can create a physical stream out of it.
   *
   * <p>This escape will replace ".", "(" and "/" as "-", and then remove all the other
   * non-alphabetic characters.
   */
  public static String escape(String name) {
    return name.replaceAll("[\\.(/]", "-").replaceAll("[^A-Za-z0-9-_]", "");
  }

  public static PCollection.IsBounded isBounded(RunnerApi.PCollection pCollection) {
    return pCollection.getIsBounded() == RunnerApi.IsBounded.Enum.BOUNDED
        ? PCollection.IsBounded.BOUNDED
        : PCollection.IsBounded.UNBOUNDED;
  }
}