/*

 * Copyright (c) 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.

 */

package jdk.incubator.http;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.nio.ByteBuffer;

import java.nio.channels.SocketChannel;

import java.util.Optional;

import java.util.concurrent.CompletableFuture;

import org.testng.annotations.Test;

import jdk.incubator.http.internal.common.ByteBufferReference;

@Test

public class ResponseHeadersTest {

    static final String BODY =

          "This is the body dude,\r\n"

        + "not a header!\r\n";

    static final String MESSAGE_OK =

          "HTTP/1.1 200 OK\r\n"

        + "Content-Length: " + BODY.length() + "\r\n"

        + "MY-Folding-Header: YES\r\n"

        + " OR\r\n"

        + " NO\r\n"

        + "\r\n"

        + BODY;

    static final String MESSAGE_NOK =

          "HTTP/1.1 101 Switching Protocols\r\n"

        + "\r\n";

    //public static void main(String[] args) throws IOException {

    //    new  ResponseHeadersTest().test();

    //}

    @Test

    public void test() throws IOException {

        testResponseHeaders(MESSAGE_OK);

        testResponseHeaders(MESSAGE_NOK);

    }

    /**

     * Verifies that ResponseHeaders behave as we expect.

     * @param msg The response string.

     * @throws IOException should not happen.

     */

    static void testResponseHeaders(String msg) throws IOException {

        byte[] bytes = msg.getBytes("US-ASCII");

        ByteBuffer buffer = ByteBuffer.wrap(bytes);

        // Read status line

        String statusLine = readStatusLine(buffer);

        System.out.println("StatusLine: " + statusLine);

        if (!statusLine.startsWith("HTTP/1.1")) {

            throw new AssertionError("bad status line: " + statusLine);

        }

        // We have two cases:

        //    - MESSAGE_OK: there will be some headers to read,

        //    - MESSAGE_NOK: there will be no headers to read.

        HttpHeaders headers = createResponseHeaders(buffer);

        // Now get the expected length of the body

        Optional<String> contentLengthValue = headers.firstValue("Content-length");

        int contentLength = contentLengthValue.map(Integer::parseInt).orElse(0);

        // We again have two cases:

        //    - MESSAGE_OK:  there should be a Content-length: header

        //    - MESSAGE_NOK: there should be no Content-length: header

        if (contentLengthValue.isPresent()) {

            // MESSAGE_NOK has no headers and no body and therefore

            // no Content-length: header.

            if (MESSAGE_NOK.equals(msg)) {

                throw new AssertionError("Content-length: header found in"

                          + " error 101 message");

            }

        } else {

            if (!MESSAGE_NOK.equals(msg)) {

                throw new AssertionError("Content-length: header not found");

            }

        }

        // Now read the remaining bytes. It should either be

        // the empty string (MESSAGE_NOK) or BODY (MESSAGE_OK),

        // and it should not contains any leading CR or LF"

        String remaining = readRemainingBytes(buffer);

        System.out.println("Body: <<<" + remaining + ">>>");

        if (remaining.length() != contentLength) {

            throw new AssertionError("Unexpected body length: " + remaining.length()

                     + " expected " + contentLengthValue);

        }

        if (contentLengthValue.isPresent()) {

            if (!BODY.equals(remaining)) {

                throw new AssertionError("Body does not match!");

            }

        }

    }

    static String readRemainingBytes(ByteBuffer buffer) throws UnsupportedEncodingException {

        byte[] res = new byte[buffer.limit() - buffer.position()];

        System.arraycopy(buffer.array(), buffer.position(), res, 0, res.length);

        buffer.position(buffer.limit());

        return new String(res, "US-ASCII");

    }

    static String readStatusLine(ByteBuffer buffer) throws IOException {

        buffer.mark();

        int p = buffer.position();

        while(buffer.hasRemaining()) {

            char c = (char)buffer.get();

            if (c == '\r') {

                c = (char)buffer.get();

                if (c == '\n') {

                    byte[] res = new byte[buffer.position() - p -2];

                    System.arraycopy(buffer.array(), p, res, 0, res.length);

                    return new String(res, "US-ASCII");

                }

            }

        }

        throw new IOException("Status line not found");

    }

            throw new AssertionError("Bad test assumption: should not have reached here!");

        }

    }

    public static HttpHeaders createResponseHeaders(ByteBuffer buffer)

        throws IOException{

    }

}