/*

 * Copyright (c) 2018, 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.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.net.http.HttpResponse.BodySubscriber;

import java.net.http.HttpResponse.BodySubscribers;

import java.nio.ByteBuffer;

import java.nio.charset.Charset;

import java.nio.charset.MalformedInputException;

import java.util.Arrays;

import java.util.List;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.SubmissionPublisher;

import java.util.concurrent.atomic.AtomicReference;

import java.util.stream.Collectors;

import java.util.stream.Stream;

import org.testng.annotations.Test;

import static java.nio.charset.StandardCharsets.UTF_8;

import static java.nio.charset.StandardCharsets.UTF_16;

import static org.testng.Assert.assertEquals;

/*

 * @test

 * @summary tests for BodySubscribers returned by asLines.

 *       In particular tests that surrogate characters are handled

 *       correctly.

 * @modules java.net.http java.logging

 * @run testng/othervm LineStreamsAndSurrogatesTest

 */

public class LineStreamsAndSurrogatesTest {

    static final Class<NullPointerException> NPE = NullPointerException.class;

    private static final List<String> lines(String text) {

        return new BufferedReader(new StringReader(text)).lines().collect(Collectors.toList());

    }

    @Test

    void testUncomplete() throws Exception {

        // Uses U+10400 which is encoded as the surrogate pair U+D801 U+DC00

        String text = "Bient\u00f4t\r\n nous plongerons\r\n dans\r les\n\n" +

                " fr\u00f4\ud801\udc00des\r\n t\u00e9n\u00e8bres\ud801\udc00";

        Charset charset = UTF_8;

        BodySubscriber<Stream<String>> bodySubscriber = BodySubscribers.ofLines(charset);

        AtomicReference<Throwable> errorRef = new AtomicReference<>();

        Runnable run = () -> {

            try {

                SubmissionPublisher<List<ByteBuffer>> publisher = new SubmissionPublisher<>();

                byte[] sbytes = text.getBytes(charset);

                byte[] bytes = Arrays.copyOfRange(sbytes, 0, sbytes.length - 1);

                publisher.subscribe(bodySubscriber);

                System.out.println("Publishing " + bytes.length + " bytes");

                for (int i = 0; i < bytes.length; i++) {

                    // ensure that surrogates are split over several buffers.

                    publisher.submit(List.of(ByteBuffer.wrap(bytes, i, 1)));

                }

                publisher.close();

            } catch(Throwable t) {

                errorRef.set(t);

            }

        };

        Thread thread = new Thread(run,"Publishing");

        thread.start();

        try {

            Stream<String> stream = bodySubscriber.getBody().toCompletableFuture().get();

            List<String> list = stream.collect(Collectors.toList());

            String resp = list.stream().collect(Collectors.joining(""));

            System.out.println("***** Got: " + resp);

            byte[] sbytes = text.getBytes(UTF_8);

            byte[] bytes = Arrays.copyOfRange(sbytes, 0, sbytes.length - 1);

            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);

            BufferedReader reader = new BufferedReader(new InputStreamReader(bais, charset));

            String resp2 = reader.lines().collect(Collectors.joining(""));

            System.out.println("***** Got2: " + resp2);

            assertEquals(resp, resp2);

            assertEquals(list, List.of("Bient\u00f4t",

                                       " nous plongerons",

                                       " dans",

                                       " les",

                                       "",

                                       " fr\u00f4\ud801\udc00des",

                                       " t\u00e9n\u00e8bres\ufffd"));

        } catch (ExecutionException x) {

            Throwable cause = x.getCause();

            if (cause instanceof MalformedInputException) {

                throw new RuntimeException("Unexpected MalformedInputException", cause);

            }

            throw x;

        }

        if (errorRef.get() != null) {

            throw new RuntimeException("Unexpected exception", errorRef.get());

        }

    }

    @Test

    void testStream1() throws Exception {

        // Uses U+10400 which is encoded as the surrogate pair U+D801 U+DC00

        String text = "Bient\u00f4t\r\n nous plongerons\r\n dans\r\r les\n\n" +

                " fr\u00f4\ud801\udc00des\r\n t\u00e9n\u00e8bres";

        Charset charset = UTF_8;

        BodySubscriber<Stream<String>> bodySubscriber = BodySubscribers.ofLines(charset);

        SubmissionPublisher<List<ByteBuffer>> publisher = new SubmissionPublisher<>();

        byte[] bytes = text.getBytes(charset);

        AtomicReference<Throwable> errorRef = new AtomicReference<>();

        Runnable run = () -> {

            try {

                publisher.subscribe(bodySubscriber);

                System.out.println("Publishing " + bytes.length + " bytes");

                for (int i = 0; i < bytes.length; i++) {

                    // ensure that surrogates are split over several buffers.

                    publisher.submit(List.of(ByteBuffer.wrap(bytes, i, 1)));

                }

                publisher.close();

            } catch(Throwable t) {

                errorRef.set(t);

            }

        };

        Stream<String> stream = bodySubscriber.getBody().toCompletableFuture().get();

        Thread thread = new Thread(run,"Publishing");

        thread.start();

        List<String> list = stream.collect(Collectors.toList());

        String resp = list.stream().collect(Collectors.joining("|"));

        System.out.println("***** Got: " + resp);

        assertEquals(resp, text.replace("\r\n", "|")

                               .replace("\n","|")

                               .replace("\r","|"));

        assertEquals(list, List.of("Bient\u00f4t",

                " nous plongerons",

                " dans",

                "",

                " les",

                "",

                " fr\u00f4\ud801\udc00des",

                " t\u00e9n\u00e8bres"));

        assertEquals(list, lines(text));

        if (errorRef.get() != null) {

            throw new RuntimeException("Unexpected exception", errorRef.get());

        }

    }

    @Test

    void testStream2() throws Exception {

        String text = "Bient\u00f4t\r\n nous plongerons\r\n dans\r\r" +

                " les fr\u00f4\ud801\udc00des\r\n t\u00e9n\u00e8bres\r\r";

        Charset charset = UTF_8;

        BodySubscriber<Stream<String>> bodySubscriber = BodySubscribers.ofLines(charset);

        SubmissionPublisher<List<ByteBuffer>> publisher = new SubmissionPublisher<>();

        byte[] bytes = text.getBytes(charset);

        AtomicReference<Throwable> errorRef = new AtomicReference<>();

        Runnable run = () -> {

            try {

                publisher.subscribe(bodySubscriber);

                System.out.println("Publishing " + bytes.length + " bytes");

                for (int i = 0; i < bytes.length; i++) {

                    // ensure that surrogates are split over several buffers.

                    publisher.submit(List.of(ByteBuffer.wrap(bytes, i, 1)));

                }

                publisher.close();

            } catch(Throwable t) {

                errorRef.set(t);

            }

        };

        Stream<String> stream = bodySubscriber.getBody().toCompletableFuture().get();

        Thread thread = new Thread(run,"Publishing");

        thread.start();

        List<String> list = stream.collect(Collectors.toList());

        String resp = list.stream().collect(Collectors.joining(""));

        System.out.println("***** Got: " + resp);

        String expected = Stream.of(text.split("\r\n|\r|\n"))

                .collect(Collectors.joining(""));

        assertEquals(resp, expected);

        assertEquals(list, List.of("Bient\u00f4t",

                " nous plongerons",

                " dans",

                "",

                " les fr\u00f4\ud801\udc00des",

                " t\u00e9n\u00e8bres",

                ""));

        assertEquals(list, lines(text));

        if (errorRef.get() != null) {

            throw new RuntimeException("Unexpected exception", errorRef.get());

        }

    }

    @Test

    void testStream3_UTF16() throws Exception {

        // Uses U+10400 which is encoded as the surrogate pair U+D801 U+DC00

        String text = "Bient\u00f4t\r\n nous plongerons\r\n dans\r\r" +

                " les\n\n fr\u00f4\ud801\udc00des\r\n t\u00e9n\u00e8bres";

        Charset charset = UTF_16;

        BodySubscriber<Stream<String>> bodySubscriber = BodySubscribers.ofLines(charset);

        SubmissionPublisher<List<ByteBuffer>> publisher = new SubmissionPublisher<>();

        byte[] bytes = text.getBytes(charset);

        AtomicReference<Throwable> errorRef = new AtomicReference<>();

        Runnable run = () -> {

            try {

                publisher.subscribe(bodySubscriber);

                System.out.println("Publishing " + bytes.length + " bytes");

                for (int i = 0; i < bytes.length; i++) {

                    // ensure that surrogates are split over several buffers.

                    publisher.submit(List.of(ByteBuffer.wrap(bytes, i, 1)));

                }

                publisher.close();

            } catch(Throwable t) {

                errorRef.set(t);

            }

        };

        Stream<String> stream = bodySubscriber.getBody().toCompletableFuture().get();

        Thread thread = new Thread(run,"Publishing");

        thread.start();

        List<String> list = stream.collect(Collectors.toList());

        String resp = list.stream().collect(Collectors.joining(""));

        System.out.println("***** Got: " + resp);

        assertEquals(resp, text.replace("\n","").replace("\r",""));

        assertEquals(list, List.of("Bient\u00f4t",

                " nous plongerons",

                " dans",

                "",

                " les",

                "",

                " fr\u00f4\ud801\udc00des",

                " t\u00e9n\u00e8bres"));

        assertEquals(list, lines(text));

        if (errorRef.get() != null) {

            throw new RuntimeException("Unexpected exception", errorRef.get());

        }

    }

    @Test

    void testStream4_UTF16() throws Exception {

        String text = "Bient\u00f4t\r\n nous plongerons\r\n dans\r\r" +

                " les fr\u00f4\ud801\udc00des\r\n t\u00e9n\u00e8bres\r\r";

        Charset charset = UTF_16;

        BodySubscriber<Stream<String>> bodySubscriber = BodySubscribers.ofLines(charset);

        SubmissionPublisher<List<ByteBuffer>> publisher = new SubmissionPublisher<>();

        byte[] bytes = text.getBytes(charset);

        AtomicReference<Throwable> errorRef = new AtomicReference<>();

        Runnable run = () -> {

            try {

                publisher.subscribe(bodySubscriber);

                System.out.println("Publishing " + bytes.length + " bytes");

                for (int i = 0; i < bytes.length; i++) {

                    // ensure that surrogates are split over several buffers.

                    publisher.submit(List.of(ByteBuffer.wrap(bytes, i, 1)));

                }

                publisher.close();

            } catch(Throwable t) {

                errorRef.set(t);

            }

        };

        Stream<String> stream = bodySubscriber.getBody().toCompletableFuture().get();

        Thread thread = new Thread(run,"Publishing");

        thread.start();

        List<String> list = stream.collect(Collectors.toList());

        String resp = list.stream().collect(Collectors.joining(""));

        System.out.println("***** Got: " + resp);

        String expected = Stream.of(text.split("\r\n|\r|\n"))

                .collect(Collectors.joining(""));

        assertEquals(resp, expected);

        assertEquals(list, List.of("Bient\u00f4t",

                " nous plongerons",

                " dans",

                "",

                " les fr\u00f4\ud801\udc00des",

                " t\u00e9n\u00e8bres",

                ""));

        assertEquals(list, lines(text));

        if (errorRef.get() != null) {

            throw new RuntimeException("Unexpected exception", errorRef.get());

        }

    }

}