/*

 * 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.ByteArrayOutputStream;

import java.io.IOException;

import java.io.PrintStream;

import java.io.StringReader;

import java.io.UncheckedIOException;

import java.math.BigInteger;

import java.net.InetSocketAddress;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import java.net.http.HttpResponse.BodySubscribers;

import java.nio.charset.Charset;

import java.nio.charset.StandardCharsets;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.CopyOnWriteArrayList;

import java.util.concurrent.Flow;

import java.util.function.Function;

import java.util.function.Supplier;

import java.util.stream.Collectors;

import java.util.stream.Stream;

import javax.net.ssl.SSLContext;

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import jdk.testlibrary.SimpleSSLContext;

import org.testng.annotations.AfterTest;

import org.testng.annotations.BeforeTest;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

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

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

import static java.net.http.HttpRequest.BodyPublishers.ofString;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertNotNull;

import static org.testng.Assert.assertThrows;

import static org.testng.Assert.assertTrue;

/*

 * @test

 * @summary Basic tests for line adapter subscribers as created by

 *          the BodyHandlers returned by BodyHandler::fromLineSubscriber

 *          and BodyHandler::asLines

 * @modules java.base/sun.net.www.http

 *          java.net.http/jdk.internal.net.http.common

 *          java.net.http/jdk.internal.net.http.frame

 *          java.net.http/jdk.internal.net.http.hpack

 *          java.logging

 *          jdk.httpserver

 * @library /lib/testlibrary http2/server

 * @build Http2TestServer LineBodyHandlerTest HttpServerAdapters

 * @build jdk.testlibrary.SimpleSSLContext

 * @run testng/othervm LineBodyHandlerTest

 */

public class LineBodyHandlerTest implements HttpServerAdapters {

    SSLContext sslContext;

    HttpTestServer httpTestServer;    // HTTP/1.1    [ 4 servers ]

    HttpTestServer httpsTestServer;   // HTTPS/1.1

    HttpTestServer http2TestServer;   // HTTP/2 ( h2c )

    HttpTestServer https2TestServer;  // HTTP/2 ( h2  )

    String httpURI;

    String httpsURI;

    String http2URI;

    String https2URI;

    @DataProvider(name = "uris")

    public Object[][] variants() {

        return new Object[][]{

                { httpURI   },

                { httpsURI  },

                { http2URI  },

                { https2URI },

        };

    }

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

    static final Class<IllegalArgumentException> IAE = IllegalArgumentException.class;

    @Test

    public void testNull() {

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(null));

        assertNotNull(BodyHandlers.fromLineSubscriber(new StringSubscriber()));

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(null, Function.identity(), "\n"));

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(new StringSubscriber(), null, "\n"));

        assertNotNull(BodyHandlers.fromLineSubscriber(new StringSubscriber(), Function.identity(), null));

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(null, null, "\n"));

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(null, Function.identity(), null));

        assertThrows(NPE, () -> BodyHandlers.fromLineSubscriber(new StringSubscriber(), null, null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, Function.identity(),

                Charset.defaultCharset(), System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), null,

                Charset.defaultCharset(), System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), Function.identity(),

                null, System.lineSeparator()));

        assertNotNull(BodySubscribers.fromLineSubscriber(new StringSubscriber(), Function.identity(),

                Charset.defaultCharset(), null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, null,

                Charset.defaultCharset(), System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, Function.identity(),

                null, System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, Function.identity(),

                Charset.defaultCharset(), null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), null,

                null, System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), null,

                Charset.defaultCharset(), null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), Function.identity(),

                null, null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), null, null, null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, Function.identity(),

                null, null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, null,

                Charset.defaultCharset(), null));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, null,

                null, System.lineSeparator()));

        assertThrows(NPE, () -> BodySubscribers.fromLineSubscriber(null, null, null, null));

    }

    @Test

    public void testIAE() {

        assertThrows(IAE, () -> BodyHandlers.fromLineSubscriber(new StringSubscriber(), Function.identity(),""));

        assertThrows(IAE, () -> BodyHandlers.fromLineSubscriber(new CharSequenceSubscriber(), Function.identity(),""));

        assertThrows(IAE, () -> BodyHandlers.fromLineSubscriber(new ObjectSubscriber(), Function.identity(), ""));

        assertThrows(IAE, () -> BodySubscribers.fromLineSubscriber(new StringSubscriber(), Function.identity(),

                    StandardCharsets.UTF_8, ""));

        assertThrows(IAE, () -> BodySubscribers.fromLineSubscriber(new CharSequenceSubscriber(), Function.identity(),

                    StandardCharsets.UTF_16, ""));

        assertThrows(IAE, () -> BodySubscribers.fromLineSubscriber(new ObjectSubscriber(), Function.identity(),

                    StandardCharsets.US_ASCII, ""));

    }

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

        if (eol == null) {

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

        } else {

            String replaced = text.replace(eol, "|");

            int i=0;

            while(replaced.endsWith("||")) {

                replaced = replaced.substring(0,replaced.length()-1);

                i++;

            }

            List<String> res = List.of(replaced.split("\\|"));

            if (i > 0) {

                res = new ArrayList<>(res);

                for (int j=0; j<i; j++) res.add("");

            }

            return res;

        }

    }

    @Test(dataProvider = "uris")

    void testStringWithFinisher(String url) {

        String body = "May the luck of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext)

                .build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        StringSubscriber subscriber = new StringSubscriber();

        CompletableFuture<HttpResponse<String>> cf

                = client.sendAsync(request, BodyHandlers.fromLineSubscriber(

                        subscriber, Supplier::get, "\n"));

        assertNoObtrusion(cf);

        HttpResponse<String> response = cf.join();

        String text = response.body();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertEquals(text, body);

        assertEquals(subscriber.list, lines(body, "\n"));

    }

    @Test(dataProvider = "uris")

    void testAsStream(String url) {

        String body = "May the luck of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext)

                .build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        CompletableFuture<HttpResponse<Stream<String>>> cf

                = client.sendAsync(request, BodyHandlers.ofLines());

        assertNoObtrusion(cf);

        HttpResponse<Stream<String>> response = cf.join();

        Stream<String> stream = response.body();

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

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

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertEquals(text, body);

        assertEquals(list, List.of(body));

        assertEquals(list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testStringWithFinisher2(String url) {

        String body = "May the luck\r\n\r\n of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        StringSubscriber subscriber = new StringSubscriber();

        CompletableFuture<HttpResponse<Void>> cf

                = client.sendAsync(request,

                                   BodyHandlers.fromLineSubscriber(subscriber));

        assertNoObtrusion(cf);

        HttpResponse<Void> response = cf.join();

        String text = subscriber.get();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

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

        assertEquals(subscriber.list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testAsStreamWithCRLF(String url) {

        String body = "May the luck\r\n\r\n of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        CompletableFuture<HttpResponse<Stream<String>>> cf

                = client.sendAsync(request, BodyHandlers.ofLines());

        assertNoObtrusion(cf);

        HttpResponse<Stream<String>> response = cf.join();

        Stream<String> stream = response.body();

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

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

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertEquals(text, "May the luck|| of the Irish be with you!");

        assertEquals(list, List.of("May the luck",

                                   "",

                                   " of the Irish be with you!"));

        assertEquals(list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testStringWithFinisherBlocking(String url) throws Exception {

        String body = "May the luck of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body)).build();

        StringSubscriber subscriber = new StringSubscriber();

        HttpResponse<String> response = client.send(request,

                BodyHandlers.fromLineSubscriber(subscriber, Supplier::get, "\n"));

        String text = response.body();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertEquals(text, "May the luck of the Irish be with you!");

        assertEquals(subscriber.list, lines(body, "\n"));

    }

    @Test(dataProvider = "uris")

    void testStringWithoutFinisherBlocking(String url) throws Exception {

        String body = "May the luck of the Irish be with you!";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body)).build();

        StringSubscriber subscriber = new StringSubscriber();

        HttpResponse<Void> response = client.send(request,

                BodyHandlers.fromLineSubscriber(subscriber));

        String text = subscriber.get();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertEquals(text, "May the luck of the Irish be with you!");

        assertEquals(subscriber.list, lines(body, null));

    }

    // Subscriber<Object>

    @Test(dataProvider = "uris")

    void testAsStreamWithMixedCRLF(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.\r\r";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        CompletableFuture<HttpResponse<Stream<String>>> cf

                = client.sendAsync(request, BodyHandlers.ofLines());

        assertNoObtrusion(cf);

        HttpResponse<Stream<String>> response = cf.join();

        Stream<String> stream = response.body();

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

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

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May| the wind| always be|at your back.|");

        assertEquals(list, List.of("May",

                                   " the wind",

                                   " always be",

                                   "at your back.",

                                   ""));

        assertEquals(list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testAsStreamWithMixedCRLF_UTF8(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.\r\r";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .header("Content-type", "text/text; charset=UTF-8")

                .POST(BodyPublishers.ofString(body, UTF_8)).build();

        CompletableFuture<HttpResponse<Stream<String>>> cf

                = client.sendAsync(request, BodyHandlers.ofLines());

        assertNoObtrusion(cf);

        HttpResponse<Stream<String>> response = cf.join();

        Stream<String> stream = response.body();

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

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

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May| the wind| always be|at your back.|");

        assertEquals(list, List.of("May",

                                   " the wind",

                                   " always be",

                                   "at your back.", ""));

        assertEquals(list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testAsStreamWithMixedCRLF_UTF16(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.\r\r";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .header("Content-type", "text/text; charset=UTF-16")

                .POST(BodyPublishers.ofString(body, UTF_16)).build();

        CompletableFuture<HttpResponse<Stream<String>>> cf

                = client.sendAsync(request, BodyHandlers.ofLines());

        assertNoObtrusion(cf);

        HttpResponse<Stream<String>> response = cf.join();

        Stream<String> stream = response.body();

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

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

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May| the wind| always be|at your back.|");

        assertEquals(list, List.of("May",

                                   " the wind",

                                   " always be",

                                   "at your back.",

                                   ""));

        assertEquals(list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testObjectWithFinisher(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        ObjectSubscriber subscriber = new ObjectSubscriber();

        CompletableFuture<HttpResponse<String>> cf

                = client.sendAsync(request, BodyHandlers.fromLineSubscriber(

                        subscriber, ObjectSubscriber::get, "\r\n"));

        assertNoObtrusion(cf);

        HttpResponse<String> response = cf.join();

        String text = response.body();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May\n the wind\n always be\rat your back.");

        assertEquals(subscriber.list, List.of("May",

                                              " the wind",

                                              " always be\rat your back."));

        assertEquals(subscriber.list, lines(body, "\r\n"));

    }

    @Test(dataProvider = "uris")

    void testObjectWithFinisher_UTF16(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.\r\r";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext).build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .header("Content-type", "text/text; charset=UTF-16")

                .POST(BodyPublishers.ofString(body, UTF_16)).build();

        ObjectSubscriber subscriber = new ObjectSubscriber();

        CompletableFuture<HttpResponse<String>> cf

                = client.sendAsync(request, BodyHandlers.fromLineSubscriber(

                        subscriber, ObjectSubscriber::get, null));

        assertNoObtrusion(cf);

        HttpResponse<String> response = cf.join();

        String text = response.body();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May\n the wind\n always be\nat your back.\n");

        assertEquals(subscriber.list, List.of("May",

                                              " the wind",

                                              " always be",

                                              "at your back.",

                                              ""));

        assertEquals(subscriber.list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testObjectWithoutFinisher(String url) {

        String body = "May\r\n the wind\r\n always be\rat your back.";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext)

                .build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        ObjectSubscriber subscriber = new ObjectSubscriber();

        CompletableFuture<HttpResponse<Void>> cf

                = client.sendAsync(request,

                                   BodyHandlers.fromLineSubscriber(subscriber));

        assertNoObtrusion(cf);

        HttpResponse<Void> response = cf.join();

        String text = subscriber.get();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May\n the wind\n always be\nat your back.");

        assertEquals(subscriber.list, List.of("May",

                                              " the wind",

                                              " always be",

                                              "at your back."));

        assertEquals(subscriber.list, lines(body, null));

    }

    @Test(dataProvider = "uris")

    void testObjectWithFinisherBlocking(String url) throws Exception {

        String body = "May\r\n the wind\r\n always be\nat your back.";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext)

                .build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        ObjectSubscriber subscriber = new ObjectSubscriber();

        HttpResponse<String> response = client.send(request,

                BodyHandlers.fromLineSubscriber(subscriber,

                                               ObjectSubscriber::get,

                                   "\r\n"));

        String text = response.body();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May\n the wind\n always be\nat your back.");

        assertEquals(subscriber.list, List.of("May",

                                              " the wind",

                                              " always be\nat your back."));

        assertEquals(subscriber.list, lines(body, "\r\n"));

    }

    @Test(dataProvider = "uris")

    void testObjectWithoutFinisherBlocking(String url) throws Exception {

        String body = "May\r\n the wind\r\n always be\nat your back.";

        HttpClient client = HttpClient.newBuilder().sslContext(sslContext)

                .build();

        HttpRequest request = HttpRequest.newBuilder(URI.create(url))

                .POST(BodyPublishers.ofString(body))

                .build();

        ObjectSubscriber subscriber = new ObjectSubscriber();

        HttpResponse<Void> response = client.send(request,

                BodyHandlers.fromLineSubscriber(subscriber));

        String text = subscriber.get();

        System.out.println(text);

        assertEquals(response.statusCode(), 200);

        assertTrue(text.length() != 0);  // what else can be asserted!

        assertEquals(text, "May\n the wind\n always be\nat your back.");

        assertEquals(subscriber.list, List.of("May",