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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.firehose.azure;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import io.druid.data.input.impl.prefetch.PrefetchableTextFilesFirehoseFactory;
import io.druid.java.util.common.CompressionUtils;
import io.druid.storage.azure.AzureByteSource;
import io.druid.storage.azure.AzureStorage;

import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.List;
import java.util.Objects;

/**
 * This class is heavily inspired by the StaticS3FirehoseFactory class in the io.druid.firehose.s3 package
 */
public class StaticAzureBlobStoreFirehoseFactory extends PrefetchableTextFilesFirehoseFactory
{
  private final AzureStorage azureStorage;
  private final List blobs;

  @JsonCreator
  public StaticAzureBlobStoreFirehoseFactory(
      @JacksonInject("azureStorage") AzureStorage azureStorage,
      @JsonProperty("blobs") List blobs,
      @JsonProperty("maxCacheCapacityBytes") Long maxCacheCapacityBytes,
      @JsonProperty("maxFetchCapacityBytes") Long maxFetchCapacityBytes,
      @JsonProperty("prefetchTriggerBytes") Long prefetchTriggerBytes,
      @JsonProperty("fetchTimeout") Long fetchTimeout,
      @JsonProperty("maxFetchRetry") Integer maxFetchRetry
  )
  {
    super(maxCacheCapacityBytes, maxFetchCapacityBytes, prefetchTriggerBytes, fetchTimeout, maxFetchRetry);
    this.blobs = blobs;
    this.azureStorage = azureStorage;
  }

  @JsonProperty
  public List getBlobs()
  {
    return blobs;
  }

  @Override
  protected Collection initObjects()
  {
    return blobs;
  }

  @Override
  protected InputStream openObjectStream(AzureBlob object) throws IOException
  {
    return makeByteSource(azureStorage, object).openStream();
  }

  @Override
  protected InputStream wrapObjectStream(AzureBlob object, InputStream stream) throws IOException
  {
    return object.getPath().endsWith(".gz") ? CompressionUtils.gzipInputStream(stream) : stream;
  }

  private static AzureByteSource makeByteSource(AzureStorage azureStorage, AzureBlob object)
  {
    final String container = object.getContainer();
    final String path = object.getPath().startsWith("/")
                        ? object.getPath().substring(1)
                        : object.getPath();

    return new AzureByteSource(azureStorage, container, path);
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }

    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    final StaticAzureBlobStoreFirehoseFactory that = (StaticAzureBlobStoreFirehoseFactory) o;

    return Objects.equals(blobs, that.blobs) &&
           getMaxCacheCapacityBytes() == that.getMaxCacheCapacityBytes() &&
           getMaxFetchCapacityBytes() == that.getMaxFetchCapacityBytes() &&
           getPrefetchTriggerBytes() == that.getPrefetchTriggerBytes() &&
           getFetchTimeout() == that.getFetchTimeout() &&
           getMaxFetchRetry() == that.getMaxFetchRetry();
  }

  @Override
  public int hashCode()
  {
    return Objects.hash(
        blobs,
        getMaxCacheCapacityBytes(),
        getMaxFetchCapacityBytes(),
        getPrefetchTriggerBytes(),
        getFetchTimeout(),
        getMaxFetchRetry()
    );
  }
}