package utils

type ReactiveValue[T any] struct {
	V       T
	subscribers []chan *T
}

func NewReactiveValue[T any](value T) *ReactiveValue[T] {
	return &ReactiveValue[T]{
		V:       value,
		subscribers: make([]chan *T, 0),
	}
}

func (rv *ReactiveValue[T]) Set(value T) {
	rv.V = value
	for _, subscriber := range rv.subscribers {
		subscriber <- &value
	}
}

func (rv *ReactiveValue[T]) Subscribe() chan *T {
	subscriber := make(chan *T)
	rv.subscribers = append(rv.subscribers, subscriber)
	return subscriber
}

func (rv *ReactiveValue[T]) Unsubscribe(subscriber chan *T) {
	for i, s := range rv.subscribers {
		if s == subscriber {
			rv.subscribers = append(rv.subscribers[:i], rv.subscribers[i+1:]...)
			close(subscriber)
			return
		}
	}
}