package i_love_companion_objects

import kotlinx.coroutines.*

// Extension function on the companion object, easy to discover. Can be suspending.
suspend fun SomeInterface.Companion.createWithDefaults(): SomeInterface {
    return SomeInterfaceOtherImpl(
        someParameter = pretendToDoSomeWorkAndReturnIt()
    )
}

// Looks like a constructor, but suspends. Could take any parameters, can have overloads.
suspend operator fun SomeInterface.Companion.invoke(): SomeInterface {
    return createWithDefaults()
}


private suspend fun pretendToDoSomeWorkAndReturnIt(): Any {
    return delay(timeMillis = 10)
}

// Implementation is hidden, no need to guess its name.
private class SomeInterfaceOtherImpl(
    private val someParameter: Any
) : SomeInterface {

    override suspend fun someFunction() {
        println("FYI: someFunction called in $javaClass having someParameter set to $someParameter")
    }
}