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import { MonoTypeOperatorFunction, ObservableInput } from '../types';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { innerFrom } from '../observable/innerFrom';
import { noop } from '../util/noop';
/**
* Returns an Observable that skips items emitted by the source Observable until a second Observable emits an item.
*
* The `skipUntil` operator causes the observable stream to skip the emission of values until the passed in observable
* emits the first value. This can be particularly useful in combination with user interactions, responses of HTTP
* requests or waiting for specific times to pass by.
*
* 
*
* Internally, the `skipUntil` operator subscribes to the passed in `notifier` `ObservableInput` (which gets converted
* to an Observable) in order to recognize the emission of its first value. When `notifier` emits next, the operator
* unsubscribes from it and starts emitting the values of the *source* observable until it completes or errors. It
* will never let the *source* observable emit any values if the `notifier` completes or throws an error without
* emitting a value before.
*
* ## Example
*
* In the following example, all emitted values of the interval observable are skipped until the user clicks anywhere
* within the page
*
* ```ts
* import { interval, fromEvent, skipUntil } from 'rxjs';
*
* const intervalObservable = interval(1000);
* const click = fromEvent(document, 'click');
*
* const emitAfterClick = intervalObservable.pipe(
* skipUntil(click)
* );
* // clicked at 4.6s. output: 5...6...7...8........ or
* // clicked at 7.3s. output: 8...9...10..11.......
* emitAfterClick.subscribe(value => console.log(value));
* ```
*
* @see {@link last}
* @see {@link skip}
* @see {@link skipWhile}
* @see {@link skipLast}
*
* @param notifier An `ObservableInput` that has to emit an item before the source Observable elements begin to
* be mirrored by the resulting Observable.
* @return A function that returns an Observable that skips items from the
* source Observable until the `notifier` Observable emits an item, then emits the
* remaining items.
*/
export function skipUntil<T>(notifier: ObservableInput<any>): MonoTypeOperatorFunction<T> {
return operate((source, subscriber) => {
let taking = false;
const skipSubscriber = createOperatorSubscriber(
subscriber,
() => {
skipSubscriber?.unsubscribe();
taking = true;
},
noop
);
innerFrom(notifier).subscribe(skipSubscriber);
source.subscribe(createOperatorSubscriber(subscriber, (value) => taking && subscriber.next(value)));
});
}