package reactive

import "context"

func BlockingLoop[T any](gen func() (T, error)) Observable[T] {
	return &blockingLoop[T]{gen}
}

type blockingLoop[T any] struct {
	gen func() (T, error)
}

func (b *blockingLoop[T]) Observe(ctx context.Context) <-chan Notification[T] {
	ch := make(chan Notification[T])

	go func() {
		defer close(ch)
		for {
			v, err := b.gen()
			if err != nil {
				ch <- MakeError[T](err)
			} else {
				ch <- MakeNext[T](v)
			}
		}
	}()

	return ch
}