/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.*;

import java.nio.file.*;

import java.util.Arrays;

public class TestUtil {

    final static String fileContent = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // repeated

    public static Path getAFile(int size) throws IOException {

        Path p = tempFile();

        BufferedWriter writer = Files.newBufferedWriter(p);

        int len = fileContent.length();

        int iterations = size / len;

        int remainder = size - (iterations * len);

        for (int i=0; i<iterations; i++)

            writer.write(fileContent, 0, len);

        writer.write(fileContent, 0, remainder);

        writer.close();

        return p;

    }

    public static Path tempFile() {

        try {

            Path p = Files.createTempFile("foo", "test");

            return p;

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    public static Void compareFiles(Path path1, Path path2) {

        //System.err.printf("Comparing %s and %s\n", path1.toString(), path2.toString());

        try {

            long size1 = Files.size(path1);

            long size2 = Files.size(path2);

            if (size1 != size2) {

                String msg = "File sizes do not match " +

                        Long.toString(size1) + "/" + Long.toString(size2);

                throw new RuntimeException(msg);

            }

            compareContents(path1, path2);

            return null;

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    static void compareContents(Path path1, Path path2) {

        try {

            byte[] b1 = Files.readAllBytes(path1);

            byte[] b2 = Files.readAllBytes(path2);

            if (!Arrays.equals(b1, b2))

                throw new RuntimeException ("Files do not match");

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

}