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package com.redis.spring.batch.reader;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

import io.lettuce.core.RedisFuture;

public class MappingRedisFuture extends CompletableFuture implements RedisFuture {

    private final CountDownLatch latch = new CountDownLatch(1);

    public MappingRedisFuture(CompletionStage completionStage, Function converter) {
        completionStage.thenAccept(v -> complete(converter.apply(v))).exceptionally(throwable -> {
            completeExceptionally(throwable);
            return null;
        });
    }

    @Override
    public boolean complete(T value) {
        boolean result = super.complete(value);
        latch.countDown();
        return result;
    }

    @Override
    public boolean completeExceptionally(Throwable ex) {

        boolean value = super.completeExceptionally(ex);
        latch.countDown();
        return value;
    }

    @Override
    public String getError() {
        return null;
    }

    @Override
    public boolean await(long timeout, TimeUnit unit) throws InterruptedException {
        return latch.await(timeout, unit);
    }

}