const val EVENT_MODEL_UPDATE_LOGGED_IN  : String = "modelUpdate.loggedIn"
const val EVENT_MODEL_UPDATE_LOGGED_OUT : String = "modelUpdate.loggedOut"
const val EVENT_MODEL_UPDATE_ROLES      : String = "modelUpdate.roles"
const val EVENT_MODEL_ERROR_LOGIN       : String = "modelError.login"

const val EVENT_VM_CLOSE_LOGIN          : String = "vm.closeLogin"

const val EVENT_SYSTEM_ERROR            : String = "systemError"

object Notifications {  // make Injectable?

    val subscribers = mutableMapOf<String, MutableList<SubscriberObject>>()

    fun subscribe(event : String, subscriber : Any, cb : (String, Any?) -> Unit) {
        if( !subscribers.containsKey(event) ) {
            val slist = mutableListOf<SubscriberObject>()
            subscribers.put( event, slist )
        }
        val subscriberList = subscribers.get(event)
        subscriberList?.add(SubscriberObject(subscriber, cb))
    }

    fun unsubscribe(event : String, subscriber : Any ) {
        val subscriberList = subscribers.get(event)
        subscriberList?.remove( subscriber as SubscriberObject )
    }

    fun publish(event : String, data : Any? = null) {
        Platform.runLater( {
            val subscriberList = subscribers.get(event)
            subscriberList?.forEach( {
                it -> it.cb(event, data)
            })
        })
    }

    class SubscriberObject( val subscriber : Any, val cb : (String, Any?) -> Unit ) {
        override fun equals(other: Any?): Boolean {
            return subscriber.equals(other)
        }

        override fun hashCode(): Int {
            return subscriber.hashCode()
        }
    }
}