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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 org.apache.spark.streaming.aliyun.datahub

import com.aliyun.datahub.auth.AliyunAccount
import com.aliyun.datahub.model.RecordEntry
import com.aliyun.datahub.{DatahubClient, DatahubConfiguration}
import org.apache.spark.internal.Logging
import org.apache.spark.storage.StorageLevel
import org.apache.spark.streaming.StreamingContext
import org.apache.spark.streaming.dstream.DStream
import org.apache.spark.streaming.util.WriteAheadLogUtils

import scala.reflect.ClassTag

object DatahubUtils extends Logging {
  def createStream[T: ClassTag](
                    ssc: StreamingContext,
                    projectName: String,
                    topicName: String,
                    subId: String,
                    accessKeyId: String,
                    accessKeySecret: String,
                    endpoint: String,
                    shardId: String,
                    func: RecordEntry => T,
                    storageLevel: StorageLevel): DStream[T] = {
    val walEnabled = WriteAheadLogUtils.enableReceiverLog(ssc.conf)
    logInfo(s"createStream walEnabled: ${walEnabled}")
    createStream[T](
      ssc,
      projectName,
      topicName,
      subId,
      accessKeyId,
      accessKeySecret,
      endpoint,
      shardId,
      func,
      walEnabled,
      storageLevel
    )
  }

  private def createStream[T: ClassTag](
                    ssc: StreamingContext,
                    projectName: String,
                    topicName: String,
                    subId: String,
                    accessKeyId: String,
                    accessKeySecret: String,
                    endpoint: String,
                    shardId: String,
                    func: RecordEntry => T,
                    walEnabled: Boolean,
                    storageLevel: StorageLevel = StorageLevel.MEMORY_AND_DISK_SER_2): DStream[T] = {
    ssc.withNamedScope("datahub sparkstreaming") {
      new DatahubInputDStream[T](
        ssc,
        projectName,
        topicName,
        subId,
        accessKeyId,
        accessKeySecret,
        endpoint,
        shardId,
        func,
        storageLevel,
        walEnabled)
    }
  }

  def createStream[T: ClassTag](
                    ssc: StreamingContext,
                    projectName: String,
                    topicName: String,
                    subId: String,
                    accessKeyId: String,
                    accessKeySecret: String,
                    endpoint: String,
                    func: RecordEntry => T,
                    storageLevel: StorageLevel): DStream[T] = {
    val account = new AliyunAccount(accessKeyId, accessKeySecret)
    val conf = new DatahubConfiguration(account, endpoint)
    val loghubClient = new DatahubClient(conf)
    import scala.collection.JavaConverters._
    // no need to catch exception or retry if datahub-service error
    val shardEntries = loghubClient.listShard(projectName, topicName).getShards.asScala
    var dStream: DStream[T] = null

    for (shardEntry <- shardEntries) {
      if (dStream == null) {
        dStream = createStream(ssc, projectName, topicName, subId, accessKeyId, accessKeySecret, endpoint,
          shardEntry.getShardId, func, storageLevel)
      } else {
        dStream = dStream.union(createStream(ssc, projectName, topicName, subId, accessKeyId, accessKeySecret, endpoint,
          shardEntry.getShardId, func, storageLevel))
      }
    }

    dStream
  }
}