/*
 * Copyright 2013 Google Inc.
 *
 * 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.bitcoinj.utils;

import org.bitcoinj.base.internal.TimeUtils;
import org.junit.Before;
import org.junit.Test;

import java.util.PriorityQueue;

import static org.junit.Assert.assertEquals;

public class ExponentialBackoffTest {
    private ExponentialBackoff.Params params;
    private ExponentialBackoff backoff;

    @Before
    public void setUp() {
        TimeUtils.setMockClock();
        params = new ExponentialBackoff.Params();
        backoff = new ExponentialBackoff(params);
    }

    @Test
    public void testSuccess() {
        assertEquals(TimeUtils.currentTime(), backoff.retryTime());

        backoff.trackFailure();
        backoff.trackFailure();
        backoff.trackSuccess();

        assertEquals(TimeUtils.currentTime(), backoff.retryTime());
    }

    @Test
    public void testFailure() {
        assertEquals(TimeUtils.currentTime(), backoff.retryTime());

        backoff.trackFailure();
        backoff.trackFailure();
        backoff.trackFailure();

        assertEquals(TimeUtils.currentTime().plusMillis(121), backoff.retryTime());
    }

    @Test
    public void testInQueue() {
        PriorityQueue<ExponentialBackoff> queue = new PriorityQueue<>();
        ExponentialBackoff backoff1 = new ExponentialBackoff(params);
        backoff.trackFailure();
        backoff.trackFailure();
        backoff1.trackFailure();
        backoff1.trackFailure();
        backoff1.trackFailure();
        queue.offer(backoff);
        queue.offer(backoff1);

        assertEquals(queue.poll(), backoff); // The one with soonest retry time
        assertEquals(queue.peek(), backoff1);

        queue.offer(backoff);
        assertEquals(queue.poll(), backoff); // Still the same one
    }
}
