/*
 * 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.apache.ignite.internal.processors.cache.persistence.file;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.nio.channels.SocketChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import org.apache.ignite.internal.util.future.GridFutureAdapter;
import org.apache.ignite.internal.util.typedef.internal.U;
import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
import org.junit.Test;

import static org.apache.ignite.testframework.GridTestUtils.runAsync;
import static org.junit.Assert.assertArrayEquals;

/**
 * FileDownloader test
 */
public class FileDownloaderTest extends GridCommonAbstractTest {
    /** */
    private static final Path DOWNLOADER_PATH = new File("download").toPath();

    /** */
    private static final Path UPLOADER_PATH = new File("upload").toPath();

    /** {@inheritDoc} */
    @Override protected void beforeTest() throws Exception {
        super.beforeTest();

        if (DOWNLOADER_PATH.toFile().exists())
            DOWNLOADER_PATH.toFile().delete();

        if (UPLOADER_PATH.toFile().exists())
            UPLOADER_PATH.toFile().delete();
    }

    /** {@inheritDoc} */
    @Override protected void afterTest() throws Exception {
        super.afterTest();

        if (DOWNLOADER_PATH.toFile().exists())
            DOWNLOADER_PATH.toFile().delete();

        if (UPLOADER_PATH.toFile().exists())
            UPLOADER_PATH.toFile().delete();
    }

    /***
     *
     * @throws Exception If failed.
     */
    @Test
    public void test() throws Exception {
        assertTrue(UPLOADER_PATH.toFile().createNewFile());
        assertTrue(!DOWNLOADER_PATH.toFile().exists());

        PrintWriter writer = new PrintWriter(UPLOADER_PATH.toFile());

        for (int i = 0; i < 1_000_000; i++)
            writer.write("HELLO WORLD");

        writer.close();

        FileDownloader downloader = new FileDownloader(log, DOWNLOADER_PATH);

        InetSocketAddress address = downloader.start();

        GridFutureAdapter<Long> finishFut = new GridFutureAdapter<>();

        FileUploader uploader = new FileUploader(UPLOADER_PATH, log);

        SocketChannel sc = null;

        try {
            sc = SocketChannel.open(address);
        }
        catch (IOException e) {
            U.warn(log, "Fail connect to " + address, e);
        }

        runAsync(downloader::download);

        SocketChannel finalSc = sc;

        runAsync(() -> uploader.upload(finalSc, finishFut));

        finishFut.get();

        downloader.onResult(finishFut.get(), null);

        downloader.finishFuture().get();

        assertTrue(DOWNLOADER_PATH.toFile().exists());

        assertEquals(UPLOADER_PATH.toFile().length(), DOWNLOADER_PATH.toFile().length());

        assertArrayEquals(Files.readAllBytes(UPLOADER_PATH), Files.readAllBytes(DOWNLOADER_PATH));
    }
}