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package io.github.sinri.keel.facade.async;

import io.vertx.core.Future;
import io.vertx.core.Promise;

import javax.annotation.Nonnull;
import java.util.function.Function;

import static io.github.sinri.keel.facade.KeelInstance.Keel;


/**
 * @since 2.9.3
 */
public class FutureRepeat {
    private final Function> routineFunction;

    private FutureRepeat(@Nonnull Function> routineFunction) {
        this.routineFunction = routineFunction;
    }

    static Future call(@Nonnull Function> routineFunction) {
        Promise promise = Promise.promise();
        RoutineResult routineResult = new RoutineResult(false);
        new FutureRepeat(routineFunction).routine(routineResult, promise);
        return promise.future();
    }

    private void routine(@Nonnull RoutineResult routineResult, @Nonnull Promise finalPromise) {
        Future.succeededFuture()
                .compose(v -> routineFunction.apply(routineResult))
                .andThen(shouldStopAR -> {
                    if (shouldStopAR.succeeded()) {
                        if (routineResult.isToStop()) {
                            finalPromise.complete();
                        } else {
                            Keel.getVertx().setTimer(1L, x -> routine(routineResult, finalPromise));
                        }
                    } else {
                        finalPromise.fail(shouldStopAR.cause());
                    }
                });
    }

    public static class RoutineResult {
        private boolean toStop;

        public RoutineResult(boolean toStop) {
            this.toStop = toStop;
        }

        public boolean isToStop() {
            return toStop;
        }

        public RoutineResult stop() {
            this.toStop = true;
            return this;
        }
    }
}