/*

 * Copyright (c) 2019, 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

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 */

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import java.io.IOException;

import java.io.InputStream;

import java.nio.ByteBuffer;

import java.util.Arrays;

import java.util.List;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

public class STest {

    @DataProvider(name = "bufferSizes")

    public static Object[][] bufferSizes() {

        return new Object[][]{

                { 1},

                { 2},

                { 3},

                { 4},

                {16},

                {17},

        };

    }

    @DataProvider

    public static Object[][] inputStream() {

        return new Object[][] {

                {  0,   1},

                {  1,   2},

                {  1,   3},

                {  1,   4},

                {  2,   1},

                {  2,   2},

                {  2,   3},

                {  2,   4},

                {  2,  13},

                {  3,   1},

                {  3,   2},

                {  3,   3},

                {  3,   4},

                {  3,  17},

                {  4,   1},

                {  4,   2},

                {  4,   3},

                {  4,   4},

                {  4,   5},

                { 13,   1},

                { 13,   2},

                { 13,  13},

                { 16,  18},

                { 17,   2},

                {255,   1},

                {256, 255},

                {257, 267},

        };

    }

    @Test

    public void testScatter0() {

        List<ByteBuffer> buffers = S.scatterBuffer(

                ByteBuffer.allocate(0));

        assertEquals(buffers.size(), 0);

    }

    @Test(dataProvider = "bufferSizes")

    public void testScatterN(int n) {

        final ByteBuffer src = S.bufferOfNRandomBytes(n);

        final int srcLength = src.remaining();

        ByteBuffer copy = ByteBuffer.wrap(Arrays.copyOf(src.array(),

                                                        src.array().length));

        List<ByteBuffer> buffers = S.scatterBuffer(src);

        int m = 0;

        for (ByteBuffer b : buffers) {

            m += b.remaining();

            while (b.hasRemaining() & copy.hasRemaining()) {

                assertEquals(b.get(), copy.get());

            }

        }

        assertEquals(m, srcLength);

    }

    @Test(dataProvider = "inputStream")

    public void testInputStreamOfNReads(int n, int capacity) throws IOException {

        InputStream s = S.inputStreamOfNReads(n);

        int count = 0;

        byte[] b = new byte[capacity];

        while (s.read(b) != -1) {

            count++;

        }

        assertEquals(count, n);

        assertTrue(s.read() == -1);

        assertTrue(s.read(b) == -1);

    }

}