/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.eclipse.aether.named;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;

import org.junit.jupiter.api.Test;

import static org.eclipse.aether.named.support.Retry.retry;
import static org.junit.jupiter.api.Assertions.*;

/**
 * UT for {@link org.eclipse.aether.named.support.Retry}.
 */
public class RetryTest {
    private static final long RETRY_SLEEP_MILLIS = 250L;

    @Test
    void happy() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                1L,
                TimeUnit.SECONDS,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return "happy";
                },
                null,
                "notHappy");
        assertEquals(result, "happy");
        assertEquals(retries.sum(), 1);
    }

    @Test
    void notHappy() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                1L,
                TimeUnit.SECONDS,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return null;
                },
                null,
                "notHappy");
        assertEquals(result, "notHappy");
        assertTrue(retries.sum() > 1, retries.sum() + " > 1");
    }

    @Test
    void happyAfterSomeTime() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                1L,
                TimeUnit.SECONDS,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return retries.sum() == 2 ? "got it" : null;
                },
                null,
                "notHappy");
        assertEquals(result, "got it");
        assertEquals(retries.sum(), 2);
    }

    @Test
    void happyFirstAttempt() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                5,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return "happy";
                },
                null,
                "notHappy");
        assertEquals(result, "happy");
        assertEquals(retries.sum(), 1);
    }

    @Test
    void notHappyAnyAttempt() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                5,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return null;
                },
                null,
                "notHappy");
        assertEquals(result, "notHappy");
        assertEquals(retries.sum(), 5);
    }

    @Test
    void happyAfterSomeAttempt() throws InterruptedException {
        LongAdder retries = new LongAdder();
        String result = retry(
                5,
                RETRY_SLEEP_MILLIS,
                () -> {
                    retries.increment();
                    return retries.sum() == 3 ? "got it" : null;
                },
                null,
                "notHappy");
        assertEquals(result, "got it");
        assertEquals(retries.sum(), 3);
    }
}
