/*
 * Copyright 2019 Mitsunori Komatsu (komamitsu)
 *
 * 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.komamitsu.fluency.fluentd.ingester.sender;

import org.junit.jupiter.api.Test;
import org.komamitsu.fluency.fluentd.ingester.sender.retry.ExponentialBackOffRetryStrategy;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.junit.jupiter.api.Assertions.assertThrows;

class RetryableSenderTest
{
    @Test
    void testSend()
            throws IOException
    {
        ExponentialBackOffRetryStrategy.Config retryStrategyConfig =
                new ExponentialBackOffRetryStrategy.Config();
        retryStrategyConfig.setMaxRetryCount(3);

        RetryableSender.Config senderConfig = new RetryableSender.Config();
        RetryableSender sender = new RetryableSender(senderConfig,
                new FailurableSender(3), new ExponentialBackOffRetryStrategy(retryStrategyConfig));

        FailurableSender baseSender = (FailurableSender) sender.getBaseSender();
        assertThat(baseSender.getRetry(), is(0));
        sender.send(ByteBuffer.allocate(64));
        assertThat(baseSender.getRetry(), is(3));
    }

    @Test
    void testSendRetryOver()
            throws IOException
    {
        ExponentialBackOffRetryStrategy.Config retryStrategyConfig =
                new ExponentialBackOffRetryStrategy.Config();
        retryStrategyConfig.setMaxRetryCount(2);

        RetryableSender.Config senderConfig = new RetryableSender.Config();
        RetryableSender sender = new RetryableSender(senderConfig,
                new FailurableSender(3), new ExponentialBackOffRetryStrategy(retryStrategyConfig));

        FailurableSender baseSender = (FailurableSender) sender.getBaseSender();
        assertThat(baseSender.getRetry(), is(0));
        assertThrows(RetryableSender.RetryOverException.class,
                () -> sender.send(ByteBuffer.allocate(64)));
    }

    static class FailurableSender
            extends FluentdSender
    {
        private final int maxFailures;
        private int retry;

        FailurableSender(int maxFailures)
        {
            super(new FluentdSender.Config());
            this.maxFailures = maxFailures;
        }

        @Override
        public boolean isAvailable()
        {
            return true;
        }

        @Override
        protected void sendInternal(List<ByteBuffer> buffers, String ackToken)
                throws IOException
        {
            if (retry < maxFailures) {
                retry++;
                throw new IOException("Something is wrong...");
            }
        }

        int getRetry()
        {
            return retry;
        }

        @Override
        public void close()
        {
        }
    }
}
