slap__many_levels.kt

class CreateTask(
    private val clock: Clock,
    private val localStorage: LocalStorage,
    private val observers: List<TaskObserver>
) {

    fun invoke(description: String) {
        // normalize description
        val normalizedDescription = if (description.length > MAX_DESCRIPTION_LENGTH)
            description.substring(0, MAX_DESCRIPTION_LENGTH - 1) else
            description

        // create task
        val currentTime = clock.now()
        val initialStatus = Status.NotStarted
        val newTask = Task(normalizedDescription, initialStatus, currentTime)

        // save task
        localStorage.save(newTask)

        // notify
        val observingNotStarting = mutableListOf<TaskObserver>()
        for (i in 0..observers.size) {
            val taskObserver = observers[i]
            if (taskObserver.observedStatus == Status.NotStarted) {
                observingNotStarting.add(taskObserver)
            }
        }
        for (i in 0..observingNotStarting.size) {
            observingNotStarting[i].notify(newTask)
        }
    }
}