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/*

 * @test

 * @summary Tests response body subscribers's onComplete is not invoked before onSubscribe

 * @library /lib/testlibrary http2/server

 * @build jdk.testlibrary.SimpleSSLContext

 * @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

 * @run testng/othervm CustomResponseSubscriber

 */

import java.io.IOException;

import java.io.InputStream;

import java.net.InetSocketAddress;

import java.net.URI;

import java.nio.ByteBuffer;

import java.util.List;

import java.util.concurrent.CompletionStage;

import java.util.concurrent.Executor;

import java.util.concurrent.Executors;

import java.util.concurrent.Flow;

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import java.net.http.HttpClient;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandler;

import java.net.http.HttpResponse.BodySubscriber;

import java.net.http.HttpResponse.BodySubscribers;

import javax.net.ssl.SSLContext;

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.lang.System.out;

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

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

public class CustomResponseSubscriber {

    SSLContext sslContext;

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

    HttpsServer httpsTestServer;       // HTTPS/1.1

    Http2TestServer http2TestServer;   // HTTP/2 ( h2c )

    Http2TestServer https2TestServer;  // HTTP/2 ( h2  )

    String httpURI_fixed;

    String httpURI_chunk;

    String httpsURI_fixed;

    String httpsURI_chunk;

    String http2URI_fixed;

    String http2URI_chunk;

    String https2URI_fixed;

    String https2URI_chunk;

    static final int ITERATION_COUNT = 10;

    // a shared executor helps reduce the amount of threads created by the test

    static final Executor executor = Executors.newCachedThreadPool();

    @DataProvider(name = "variants")

    public Object[][] variants() {

        return new Object[][]{

                { httpURI_fixed,    false },

                { httpURI_chunk,    false },

                { httpsURI_fixed,   false },

                { httpsURI_chunk,   false },

                { http2URI_fixed,   false },

                { http2URI_chunk,   false },

                { https2URI_fixed,  false,},

                { https2URI_chunk,  false },

                { httpURI_fixed,    true },

                { httpURI_chunk,    true },

                { httpsURI_fixed,   true },

                { httpsURI_chunk,   true },

                { http2URI_fixed,   true },

                { http2URI_chunk,   true },

                { https2URI_fixed,  true,},

                { https2URI_chunk,  true },

        };

    }

    HttpClient newHttpClient() {

        return HttpClient.newBuilder()

                         .executor(executor)

                         .sslContext(sslContext)

                         .build();

    }

    @Test(dataProvider = "variants")

    public void testAsString(String uri, boolean sameClient) throws Exception {

        HttpClient client = null;

        for (int i=0; i< ITERATION_COUNT; i++) {

            if (!sameClient || client == null)

                client = newHttpClient();

            HttpRequest req = HttpRequest.newBuilder(URI.create(uri))

                                         .build();

            BodyHandler<String> handler = new CRSBodyHandler();

            HttpResponse<String> response = client.send(req, handler);

            String body = response.body();

            assertEquals(body, "");

        }

    }

    static class CRSBodyHandler implements BodyHandler<String> {

        @Override

        public BodySubscriber<String> apply(int statusCode, HttpHeaders responseHeaders) {

            assertEquals(statusCode, 200);

            return new CRSBodySubscriber();

        }

    }

    static class CRSBodySubscriber implements BodySubscriber<String> {

        private final BodySubscriber<String> ofString = BodySubscribers.ofString(UTF_8);

        volatile boolean onSubscribeCalled;

        @Override

        public void onSubscribe(Flow.Subscription subscription) {

            //out.println("onSubscribe ");

            onSubscribeCalled = true;

            ofString.onSubscribe(subscription);

        }

        @Override

        public void onNext(List<ByteBuffer> item) {

           // out.println("onNext " + item);

            assertTrue(onSubscribeCalled);

            ofString.onNext(item);

        }

        @Override

        public void onError(Throwable throwable) {

            //out.println("onError");

            assertTrue(onSubscribeCalled);

            ofString.onError(throwable);

        }

        @Override

        public void onComplete() {

            //out.println("onComplete");

            assertTrue(onSubscribeCalled, "onComplete called before onSubscribe");

            ofString.onComplete();

        }

        @Override

        public CompletionStage<String> getBody() {

            return ofString.getBody();

        }

    }

    @BeforeTest

    public void setup() throws Exception {

        sslContext = new SimpleSSLContext().get();

        if (sslContext == null)

            throw new AssertionError("Unexpected null sslContext");

        // HTTP/1.1

        HttpHandler h1_fixedLengthHandler = new HTTP1_FixedLengthHandler();

        HttpHandler h1_chunkHandler = new HTTP1_ChunkedHandler();

        httpTestServer = HttpServer.create(sa, 0);

        httpTestServer.createContext("/http1/fixed", h1_fixedLengthHandler);

        httpTestServer.createContext("/http1/chunk", h1_chunkHandler);

        httpsTestServer = HttpsServer.create(sa, 0);

        httpsTestServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));

        httpsTestServer.createContext("/https1/fixed", h1_fixedLengthHandler);

        httpsTestServer.createContext("/https1/chunk", h1_chunkHandler);

        // HTTP/2

        Http2Handler h2_fixedLengthHandler = new HTTP2_FixedLengthHandler();

        Http2Handler h2_chunkedHandler = new HTTP2_VariableHandler();

        http2TestServer.addHandler(h2_fixedLengthHandler, "/http2/fixed");

        http2TestServer.addHandler(h2_chunkedHandler, "/http2/chunk");

        https2TestServer.addHandler(h2_fixedLengthHandler, "/https2/fixed");

        https2TestServer.addHandler(h2_chunkedHandler, "/https2/chunk");

        httpTestServer.start();

        httpsTestServer.start();

        http2TestServer.start();

        https2TestServer.start();

    }

    @AfterTest

    public void teardown() throws Exception {

        httpTestServer.stop(0);

        httpsTestServer.stop(0);

        http2TestServer.stop();

        https2TestServer.stop();

    }

    static class HTTP1_FixedLengthHandler implements HttpHandler {

        @Override

        public void handle(HttpExchange t) throws IOException {

            out.println("HTTP1_FixedLengthHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody()) {

                is.readAllBytes();

            }

            t.sendResponseHeaders(200, -1);  //no body

        }

    }

    static class HTTP1_ChunkedHandler implements HttpHandler {

        @Override

        public void handle(HttpExchange t) throws IOException {

            out.println("HTTP1_ChunkedHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody()) {

                is.readAllBytes();

            }

            t.sendResponseHeaders(200, 0); // chunked

            t.getResponseBody().close();   // no body

        }

    }

    static class HTTP2_FixedLengthHandler implements Http2Handler {

        @Override

        public void handle(Http2TestExchange t) throws IOException {

            out.println("HTTP2_FixedLengthHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody()) {

                is.readAllBytes();

            }

            t.sendResponseHeaders(200, 0);

            t.getResponseBody().close();

        }

    }

    static class HTTP2_VariableHandler implements Http2Handler {

        @Override

        public void handle(Http2TestExchange t) throws IOException {

            out.println("HTTP2_VariableHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody()) {

                is.readAllBytes();

            }

            t.sendResponseHeaders(200, -1); // variable

            t.getResponseBody().close();  //no body

        }

    }

}