/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * license agreements; and to You under the Apache License, version 2.0:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * This file is part of the Apache Pekko project, which was derived from Akka.
 */

/*
 * Copyright (C) since 2016 Lightbend Inc. <https://www.lightbend.com>
 */

package org.apache.pekko.stream.connectors.huawei.pushkit

import org.apache.pekko
import pekko.actor.ClassicActorSystemProvider
import pekko.annotation.InternalApi
import com.typesafe.config.Config

object HmsSettings {

  private val MaxConcurrentConnections = 50
  private val IsTest = false

  val ConfigPath = "pekko.connectors.huawei.pushkit"

  /**
   * Reads from the given config.
   */
  def apply(config: Config): HmsSettings = {
    val maybeForwardProxy =
      if (config.hasPath("forward-proxy"))
        Option(ForwardProxy(config.getConfig("forward-proxy")))
      else
        Option.empty

    val isTest =
      if (config.hasPath("test")) config.getBoolean("test")
      else IsTest
    val maxConcurrentConnections =
      if (config.hasPath("max-concurrent-connections")) config.getInt("max-concurrent-connections")
      else MaxConcurrentConnections
    HmsSettings(
      appId = config.getString("app-id"),
      appSecret = config.getString("app-secret"),
      isTest = isTest,
      maxConcurrentConnections = maxConcurrentConnections,
      maybeForwardProxy)
  }

  /**
   * Java API: Reads from the given config.
   */
  def create(config: Config): HmsSettings = apply(config)

  /**
   * Scala API: Creates [[HmsSettings]] from the [[com.typesafe.config.Config Config]] attached to an [[org.apache.pekko.actor.ActorSystem]].
   */
  def apply(system: ClassicActorSystemProvider): HmsSettings = HmsSettingExt(system.classicSystem).settings

  implicit def settings(implicit system: ClassicActorSystemProvider): HmsSettings = apply(system)

  /**
   * Java API: Creates [[HmsSettings]] from the [[com.typesafe.config.Config Config]] attached to an actor system.
   */
  def create(system: ClassicActorSystemProvider): HmsSettings = apply(system)

  /**
   * Scala API: Creates [[HmsSettings]] from the [[com.typesafe.config.Config Config]] attached to an actor system.
   */
  def apply()(implicit system: ClassicActorSystemProvider, dummy: DummyImplicit): HmsSettings = apply(system)

  def apply(
      appId: String,
      appSecret: String,
      isTest: Boolean = IsTest,
      maxConcurrentConnections: Int = MaxConcurrentConnections,
      forwardProxy: Option[ForwardProxy]): HmsSettings =
    new HmsSettings(appId, appSecret, isTest, maxConcurrentConnections, forwardProxy)

  /**
   * Java API.
   */
  def create(
      appId: String,
      appSecret: String,
      isTest: Boolean,
      maxConcurrentConnections: Int,
      forwardProxy: ForwardProxy): HmsSettings = {
    apply(appId, appSecret, isTest, maxConcurrentConnections, Option(forwardProxy))
  }

  def apply(
      appId: String,
      appSecret: String,
      isTest: Boolean,
      maxConcurrentConnections: Int): HmsSettings =
    apply(appId, appSecret, isTest, maxConcurrentConnections, Option.empty)

  /**
   * Java API.
   */
  def create(
      appId: String,
      appSecret: String,
      isTest: Boolean,
      maxConcurrentConnections: Int) = apply(appId, appSecret, isTest, maxConcurrentConnections)

  def apply(
      appId: String,
      appSecret: String): HmsSettings = apply(appId, appSecret, Option.empty)

  /**
   * Java API.
   */
  def create(
      appId: String,
      appSecret: String) = {
    apply(appId, appSecret)
  }

  def apply(
      appId: String,
      appSecret: String,
      forwardProxy: Option[ForwardProxy]): HmsSettings =
    apply(appId, appSecret, IsTest, MaxConcurrentConnections, forwardProxy)

  /**
   * Java API.
   */
  def create(
      appId: String,
      appSecret: String,
      forwardProxy: ForwardProxy) = apply(appId, appSecret, Option(forwardProxy))

}

final case class HmsSettings @InternalApi private (
    appId: String,
    appSecret: String,
    test: Boolean,
    maxConcurrentConnections: Int,
    forwardProxy: Option[ForwardProxy]) {

  override def toString: String =
    "HmsSettings(" +
    s"appId=$appId," +
    s"appSecret=*****," +
    s"test=$test," +
    s"maxConcurrentConnections=$maxConcurrentConnections," +
    s"forwardProxy=$forwardProxy)"

  def getAppId = appId
  def getAppSecret = appSecret
  def isTest = test
  def getMaxConcurrentConnections = maxConcurrentConnections
  def getForwardProxy = forwardProxy

  def withAppId(value: String): HmsSettings = copy(appId = value)
  def withAppSecret(value: String): HmsSettings = copy(appSecret = value)
  def withIsTest(value: Boolean): HmsSettings = if (test == value) this else copy(test = value)
  def withMaxConcurrentConnections(value: Int): HmsSettings = copy(maxConcurrentConnections = value)
  def withForwardProxy(value: ForwardProxy): HmsSettings = copy(forwardProxy = Option(value))
}

object ForwardProxy {

  /**
   * Reads from the given config.
   */
  def apply(c: Config): ForwardProxy = {
    val maybeCredentials =
      if (c.hasPath("credentials"))
        Some(ForwardProxyCredentials(c.getString("credentials.username"), c.getString("credentials.password")))
      else None
    val maybeTrustPem =
      if (c.hasPath("trust-pem"))
        Some(ForwardProxyTrustPem(c.getString("trust-pem")))
      else
        None
    val minTlsVersion =
      if (c.hasPath("min-tls-version")) c.getString("min-tls-version")
      else "TLSv1.2"
    ForwardProxy(c.getString("host"), c.getInt("port"), maybeCredentials, maybeTrustPem, minTlsVersion)
  }

  /**
   * Java API: Reads from the given config.
   */
  def create(config: Config): ForwardProxy = apply(config)

  def apply(host: String,
      port: Int,
      credentials: Option[ForwardProxyCredentials],
      trustPem: Option[ForwardProxyTrustPem],
      minTlsVersion: String = "TLSv1.2") =
    new ForwardProxy(host, port, credentials, trustPem, minTlsVersion)

  /**
   * Java API.
   */
  def create(host: String,
      port: Int,
      credentials: Option[ForwardProxyCredentials],
      trustPem: Option[ForwardProxyTrustPem]) =
    apply(host, port, credentials, trustPem)

  def apply(host: String, port: Int) =
    new ForwardProxy(host, port, Option.empty, Option.empty)

  /**
   * Java API.
   */
  def create(host: String, port: Int) =
    apply(host, port)

  def apply(host: String, port: Int, credentials: Option[ForwardProxyCredentials]) =
    new ForwardProxy(host, port, credentials, Option.empty)

  /**
   * Java API.
   */
  def create(host: String, port: Int, credentials: Option[ForwardProxyCredentials]) =
    apply(host, port, credentials)
}

final case class ForwardProxy @InternalApi private (host: String,
    port: Int,
    credentials: Option[ForwardProxyCredentials],
    trustPem: Option[ForwardProxyTrustPem],
    minTlsVersion: String = "TLSv1.2") {

  def getHost = host
  def getPort = port
  def getCredentials = credentials
  def getForwardProxyTrustPem = trustPem

  /** @since 2.0.0 */
  def getMinTlsVersion = minTlsVersion

  def withHost(host: String) = copy(host = host)
  def withPort(port: Int) = copy(port = port)
  def withCredentials(credentials: ForwardProxyCredentials) = copy(credentials = Option(credentials))
  def withTrustPem(trustPem: ForwardProxyTrustPem) = copy(trustPem = Option(trustPem))

  /** @since 2.0.0 */
  def withMinTlsVersion(minTlsVersion: String) = copy(minTlsVersion = minTlsVersion)
}

object ForwardProxyCredentials {

  /** Scala API */
  def apply(username: String, password: String): ForwardProxyCredentials =
    new ForwardProxyCredentials(username, password)

  /** Java API */
  def create(username: String, password: String): ForwardProxyCredentials =
    apply(username, password)

}

final case class ForwardProxyCredentials @InternalApi private (username: String, password: String) {

  override def toString: String =
    "ForwardProxyCredentials(" +
    s"username=$username," +
    s"password=*****)"

  def getUsername: String = username
  def getPassword: String = password

  def withUsername(username: String) = copy(username = username)
  def withPassword(password: String) = copy(password = password)
}

object ForwardProxyTrustPem {

  /** Scala API */
  def apply(pemPath: String): ForwardProxyTrustPem =
    new ForwardProxyTrustPem(pemPath)

  /** Java API */
  def create(pemPath: String): ForwardProxyTrustPem =
    apply(pemPath)
}

final case class ForwardProxyTrustPem @InternalApi private (pemPath: String) {
  def getPemPath: String = pemPath
}
