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/*
 * Copyright 2013-2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.cloudfoundry.util;

import java.time.Duration;
import java.util.function.Supplier;
import org.cloudfoundry.client.v2.ClientV2Exception;
import org.cloudfoundry.client.v2.serviceinstances.LastOperation;
import reactor.core.publisher.Mono;

/**
 * Utilities for {@link LastOperation}s
 */
public final class LastOperationUtils {

    private static final String IN_PROGRESS = "in progress";

    private LastOperationUtils() {}

    public static Mono waitForCompletion(
            Duration completionTimeout, Supplier> lastOperationSupplier) {
        return lastOperationSupplier
                .get()
                .map(LastOperation::getState)
                .filter(state -> !IN_PROGRESS.equals(state))
                .repeatWhenEmpty(
                        DelayUtils.exponentialBackOff(
                                Duration.ofSeconds(1), Duration.ofSeconds(15), completionTimeout))
                .onErrorResume(
                        t ->
                                t instanceof ClientV2Exception
                                        && ((ClientV2Exception) t).getStatusCode() == 404,
                        t -> Mono.empty())
                .then();
    }
}