Pass in dependencies via constructor

package com.fsck.k9.notification

import android.app.NotificationManager

import android.content.Context

import android.support.v4.app.NotificationManagerCompat

import org.koin.dsl.module.applicationContext

import java.util.concurrent.Executors

val coreNotificationModule = applicationContext {

    bean { NotificationController(get(), get(), get(), get(), get()) }

    bean { NotificationManagerCompat.from(get()) }

    bean { NotificationHelper(get(), get(), get()) }

    bean { NotificationChannelManager(get(), get()) }

    bean {

        NotificationChannelManager(

                get(),

                Executors.newSingleThreadExecutor(),

                get<Context>().getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        )

    }

    bean { CertificateErrorNotifications(get(), get(), get()) }

    bean { AuthenticationErrorNotifications(get(), get(), get()) }

    bean { SyncNotifications(get(), get(), get()) }

import android.app.NotificationChannel

import android.app.NotificationChannelGroup

import android.app.NotificationManager

import android.content.Context

import android.os.Build

import android.support.annotation.RequiresApi

import com.fsck.k9.Account

import com.fsck.k9.Preferences

import java.util.concurrent.Executors

import java.util.concurrent.Executor

class NotificationChannelManager(private val context: Context, private val preferences: Preferences) {

class NotificationChannelManager(

        private val preferences: Preferences,

        private val backgroundExecutor: Executor,

        private val notificationManager: NotificationManager

) {

    enum class ChannelType {

        MESSAGES, MISCELLANEOUS

            return

        }

        Executors.newSingleThreadExecutor().execute {

            val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE)

                    as NotificationManager

        backgroundExecutor.execute {

            val accounts = preferences.accounts

            removeChannelsForNonExistingOrChangedAccounts(notificationManager, accounts)