package ws

func New() EventHandler {
	event := new(event)
	event.event = make(chan EventName)
	event.list = make(eventList)
	return event
}
func runEvents(stack handlerStack, data interface{}) {
	for _, handler := range stack {
		handler(data)
	}
}
func (evn *event) Start() {
	go func() {
		var eName EventName
		for {

			select {
			case eName = <-evn.event:
			case <-evn.destroy:
				break
			}
			stack, ok := evn.list[eName]
			if !ok {
				continue
			}
			runEvents(stack, evn.data)

		}
	}()
}
func (evn *event) On(name EventName, handler HandleFunc) {
	list, ok := evn.list[name]
	if !ok {
		list = make(handlerStack)
	}
	list[&handler] = handler
	evn.list[name] = list
}

func (evn *event) Off(name EventName, handler HandleFunc) {
	delete(evn.list[name], &handler)
}

//TODO: add delEvent function which will accept event Name and delete complete tree for eventlist
func (evn *event) Emit(name EventName, data interface{}) {
	evn.event <- name
	if data != nil {
		evn.data = data
	} else {
		evn.data = nil
	}
}
func (evn *event) Destroy() {
	evn.destroy <- true
	evn.list = nil
	evn.data = nil
}