/**
 * 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 kafka.server

import java.util.Properties

import DynamicConfig.Broker._
import kafka.api.ApiVersion
import kafka.controller.KafkaController
import kafka.log.{LogConfig, LogManager}
import kafka.security.CredentialProvider
import kafka.server.Constants._
import kafka.server.QuotaFactory.QuotaManagers
import kafka.utils.Logging
import org.apache.kafka.common.config.ConfigDef.Validator
import org.apache.kafka.common.config.ConfigException
import org.apache.kafka.common.metrics.Quota
import org.apache.kafka.common.metrics.Quota._
import org.apache.kafka.common.utils.Sanitizer

import scala.collection.JavaConverters._
import scala.util.Try

/**
  * The ConfigHandler is used to process config change notifications received by the DynamicConfigManager
  */
trait ConfigHandler {
  def processConfigChanges(entityName: String, value: Properties)
}

/**
  * The TopicConfigHandler will process topic config changes in ZK.
  * The callback provides the topic name and the full properties set read from ZK
  */
class TopicConfigHandler(private val logManager: LogManager, kafkaConfig: KafkaConfig, val quotas: QuotaManagers, kafkaController: KafkaController) extends ConfigHandler with Logging  {

  def processConfigChanges(topic: String, topicConfig: Properties) {
    // Validate the configurations.
    val configNamesToExclude = excludedConfigs(topic, topicConfig)

    val logs = logManager.logsByTopic(topic).toBuffer
    if (logs.nonEmpty) {
      /* combine the default properties with the overrides in zk to create the new LogConfig */
      val props = new Properties()
      topicConfig.asScala.foreach { case (key, value) =>
        if (!configNamesToExclude.contains(key)) props.put(key, value)
      }
      val logConfig = LogConfig.fromProps(logManager.currentDefaultConfig.originals, props)
      logs.foreach(_.updateConfig(topicConfig.asScala.keySet, logConfig))
    }

    def updateThrottledList(prop: String, quotaManager: ReplicationQuotaManager) = {
      if (topicConfig.containsKey(prop) && topicConfig.getProperty(prop).length > 0) {
        val partitions = parseThrottledPartitions(topicConfig, kafkaConfig.brokerId, prop)
        quotaManager.markThrottled(topic, partitions)
        debug(s"Setting $prop on broker ${kafkaConfig.brokerId} for topic: $topic and partitions $partitions")
      } else {
        quotaManager.removeThrottle(topic)
        debug(s"Removing $prop from broker ${kafkaConfig.brokerId} for topic $topic")
      }
    }
    updateThrottledList(LogConfig.LeaderReplicationThrottledReplicasProp, quotas.leader)
    updateThrottledList(LogConfig.FollowerReplicationThrottledReplicasProp, quotas.follower)

    if (Try(topicConfig.getProperty(KafkaConfig.UncleanLeaderElectionEnableProp).toBoolean).getOrElse(false)) {
      kafkaController.enableTopicUncleanLeaderElection(topic)
    }
  }

  def parseThrottledPartitions(topicConfig: Properties, brokerId: Int, prop: String): Seq[Int] = {
    val configValue = topicConfig.get(prop).toString.trim
    ThrottledReplicaListValidator.ensureValidString(prop, configValue)
    configValue match {
      case "" => Seq()
      case "*" => AllReplicas
      case _ => configValue.trim
        .split(",")
        .map(_.split(":"))
        .filter(_ (1).toInt == brokerId) //Filter this replica
        .map(_ (0).toInt).toSeq //convert to list of partition ids
    }
  }

  def excludedConfigs(topic: String, topicConfig: Properties): Set[String] = {
    // Verify message format version
    Option(topicConfig.getProperty(LogConfig.MessageFormatVersionProp)).flatMap { versionString =>
      if (kafkaConfig.interBrokerProtocolVersion < ApiVersion(versionString)) {
        warn(s"Log configuration ${LogConfig.MessageFormatVersionProp} is ignored for `$topic` because `$versionString` " +
          s"is not compatible with Kafka inter-broker protocol version `${kafkaConfig.interBrokerProtocolVersionString}`")
        Some(LogConfig.MessageFormatVersionProp)
      } else
        None
    }.toSet
  }
}


/**
 * Handles <client-id>, <user> or <user, client-id> quota config updates in ZK.
 * This implementation reports the overrides to the respective ClientQuotaManager objects
 */
class QuotaConfigHandler(private val quotaManagers: QuotaManagers) {

  def updateQuotaConfig(sanitizedUser: Option[String], sanitizedClientId: Option[String], config: Properties) {
    val clientId = sanitizedClientId.map(Sanitizer.desanitize)
    val producerQuota =
      if (config.containsKey(DynamicConfig.Client.ProducerByteRateOverrideProp))
        Some(new Quota(config.getProperty(DynamicConfig.Client.ProducerByteRateOverrideProp).toLong, true))
      else
        None
    quotaManagers.produce.updateQuota(sanitizedUser, clientId, sanitizedClientId, producerQuota)
    val consumerQuota =
      if (config.containsKey(DynamicConfig.Client.ConsumerByteRateOverrideProp))
        Some(new Quota(config.getProperty(DynamicConfig.Client.ConsumerByteRateOverrideProp).toLong, true))
      else
        None
    quotaManagers.fetch.updateQuota(sanitizedUser, clientId, sanitizedClientId, consumerQuota)
    val requestQuota =
      if (config.containsKey(DynamicConfig.Client.RequestPercentageOverrideProp))
        Some(new Quota(config.getProperty(DynamicConfig.Client.RequestPercentageOverrideProp).toDouble, true))
      else
        None
    quotaManagers.request.updateQuota(sanitizedUser, clientId, sanitizedClientId, requestQuota)
  }
}

/**
 * The ClientIdConfigHandler will process clientId config changes in ZK.
 * The callback provides the clientId and the full properties set read from ZK.
 */
class ClientIdConfigHandler(private val quotaManagers: QuotaManagers) extends QuotaConfigHandler(quotaManagers) with ConfigHandler {

  def processConfigChanges(sanitizedClientId: String, clientConfig: Properties) {
    updateQuotaConfig(None, Some(sanitizedClientId), clientConfig)
  }
}

/**
 * The UserConfigHandler will process <user> and <user, client-id> quota changes in ZK.
 * The callback provides the node name containing sanitized user principal, sanitized client-id if this is
 * a <user, client-id> update and the full properties set read from ZK.
 */
class UserConfigHandler(private val quotaManagers: QuotaManagers, val credentialProvider: CredentialProvider) extends QuotaConfigHandler(quotaManagers) with ConfigHandler {

  def processConfigChanges(quotaEntityPath: String, config: Properties) {
    // Entity path is <user> or <user>/clients/<client>
    val entities = quotaEntityPath.split("/")
    if (entities.length != 1 && entities.length != 3)
      throw new IllegalArgumentException("Invalid quota entity path: " + quotaEntityPath)
    val sanitizedUser = entities(0)
    val sanitizedClientId = if (entities.length == 3) Some(entities(2)) else None
    updateQuotaConfig(Some(sanitizedUser), sanitizedClientId, config)
    if (!sanitizedClientId.isDefined && sanitizedUser != ConfigEntityName.Default)
      credentialProvider.updateCredentials(Sanitizer.desanitize(sanitizedUser), config)
  }
}

/**
  * The BrokerConfigHandler will process individual broker config changes in ZK.
  * The callback provides the brokerId and the full properties set read from ZK.
  * This implementation reports the overrides to the respective ReplicationQuotaManager objects
  */
class BrokerConfigHandler(private val brokerConfig: KafkaConfig,
                          private val quotaManagers: QuotaManagers) extends ConfigHandler with Logging {

  def processConfigChanges(brokerId: String, properties: Properties) {
    def getOrDefault(prop: String): Long = {
      if (properties.containsKey(prop))
        properties.getProperty(prop).toLong
      else
        DefaultReplicationThrottledRate
    }
    if (brokerId == ConfigEntityName.Default)
      brokerConfig.dynamicConfig.updateDefaultConfig(properties)
    else if (brokerConfig.brokerId == brokerId.trim.toInt) {
      brokerConfig.dynamicConfig.updateBrokerConfig(brokerConfig.brokerId, properties)
      quotaManagers.leader.updateQuota(upperBound(getOrDefault(LeaderReplicationThrottledRateProp)))
      quotaManagers.follower.updateQuota(upperBound(getOrDefault(FollowerReplicationThrottledRateProp)))
      quotaManagers.alterLogDirs.updateQuota(upperBound(getOrDefault(ReplicaAlterLogDirsIoMaxBytesPerSecondProp)))
    }
  }
}

object ThrottledReplicaListValidator extends Validator {
  def ensureValidString(name: String, value: String): Unit =
    ensureValid(name, value.split(",").map(_.trim).toSeq)

  override def ensureValid(name: String, value: Any): Unit = {
    def check(proposed: Seq[Any]): Unit = {
      if (!(proposed.forall(_.toString.trim.matches("([0-9]+:[0-9]+)?"))
        || proposed.headOption.exists(_.toString.trim.equals("*"))))
        throw new ConfigException(name, value,
          s"$name must be the literal '*' or a list of replicas in the following format: [partitionId],[brokerId]:[partitionId],[brokerId]:...")
    }
    value match {
      case scalaSeq: Seq[_] => check(scalaSeq)
      case javaList: java.util.List[_] => check(javaList.asScala)
      case _ => throw new ConfigException(name, value, s"$name must be a List but was ${value.getClass.getName}")
    }
  }

  override def toString: String = "[partitionId],[brokerId]:[partitionId],[brokerId]:..."

}
