src/main/scala/xyz/driver/core/app/Module.scala


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package xyz.driver.core.app

import akka.http.scaladsl.model.StatusCodes
import akka.http.scaladsl.server.Directives.complete
import akka.http.scaladsl.server.{Route, RouteConcatenation}
import xyz.driver.core.rest.ServiceDiscovery
import xyz.driver.core.rest.ServiceDiscovery.{NoServiceDiscovery, SavingUsedServiceDiscovery}

import scala.reflect.runtime.universe._

trait Module {
  val name: String
  def route: Route
  def routeTypes: Seq[Type]

  val serviceDiscovery: ServiceDiscovery with SavingUsedServiceDiscovery = new NoServiceDiscovery()

  def activate(): Unit   = {}
  def deactivate(): Unit = {}
}

object Module {

  class EmptyModule extends Module {
    override val name: String = "Nothing"

    override def route: Route = complete(StatusCodes.OK)

    override def routeTypes: Seq[Type] = Seq.empty[Type]
  }

  class SimpleModule(override val name: String, override val route: Route, routeType: Type) extends Module {
    def routeTypes: Seq[Type] = Seq(routeType)
  }

  /**
    * Module implementation which may be used to composed a few
    *
    * @param name    more general name of the composite module,
    *                must be provided as there is no good way to automatically
    *                generalize the name from the composed modules' names
    * @param modules modules to compose into a single one
    */
  class CompositeModule(override val name: String, modules: Seq[Module]) extends Module with RouteConcatenation {

    override def route: Route = RouteConcatenation.concat(modules.map(_.route): _*)

    override def routeTypes: Seq[Type] = modules.flatMap(_.routeTypes)

    override def activate(): Unit = modules.foreach(_.activate())

    override def deactivate(): Unit = modules.reverse.foreach(_.deactivate())
  }
}