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package org.saynotobugs.confidence.rxjava3.function;

import io.reactivex.rxjava3.core.BackpressureStrategy;
import io.reactivex.rxjava3.core.Completable;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Scheduler;
import org.dmfs.jems2.bifunction.DelegatingBiFunction;
import org.dmfs.srcless.annotations.staticfactory.StaticFactories;
import org.saynotobugs.confidence.Quality;
import org.saynotobugs.confidence.rxjava3.RxSubjectAdapter;
import org.saynotobugs.confidence.rxjava3.adapters.EmitterAdapter;

import java.time.Duration;
import java.util.concurrent.TimeUnit;

@StaticFactories(value = "RxJava3", packageName = "org.saynotobugs.confidence.rxjava3")
public final class After extends DelegatingBiFunction, Flowable>
{
    /**
     * Schedules an event with the given {@link Duration} after all the previous events have been executed.
     */
    public After(Duration duration, Quality> delegate)
    {
        super((scheduler, flowable) ->
            flowable.concatWith(Completable.timer(duration.toMillis(), TimeUnit.MILLISECONDS, scheduler)
                .andThen(Flowable.create(emitter -> {
                        delegate.assessmentOf(new EmitterAdapter<>(emitter));
                        emitter.onComplete();
                    },
                    BackpressureStrategy.BUFFER))));
    }

}