/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.coyote.http2;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

import org.junit.Test;

/**
 * Unit tests for Section 3.2 of <a href="https://tools.ietf.org/html/rfc7540">RFC 7540</a>. <br>
 * The order of tests in this class is aligned with the order of the requirements in the RFC.
 */
public class TestHttp2Section_3_2 extends Http2TestBase {

    // Note: Tests for zero/multiple HTTP2-Settings fields can be found below
    // in the tests for section 3.2.1

    // TODO: Test initial requests with bodies of various sizes

    @Test
    public void testConnectionNoHttp2Support() throws Exception {
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade(DEFAULT_CONNECTION_HEADER_VALUE, "h2c", EMPTY_HTTP2_SETTINGS_HEADER, false);
        parseHttp11Response();
    }


    @Test
    public void testConnectionUpgradeWrongProtocol() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade(DEFAULT_CONNECTION_HEADER_VALUE, "h2", EMPTY_HTTP2_SETTINGS_HEADER, false);
        parseHttp11Response();
    }


    @Test(timeout = 10000)
    public void testConnectionNoPreface() throws Exception {
        setupAsFarAsUpgrade();

        // If we don't send the preface the server should kill the connection.
        try {
            // Make the parser read something.
            parser.readFrame();
        } catch (IOException ioe) {
            // Expected because the server is going to drop the connection.
        }
    }


    @Test(timeout = 10000)
    public void testConnectionIncompletePrefaceStart() throws Exception {
        setupAsFarAsUpgrade();

        // If we send an incomplete preface the server should kill the
        // connection.
        os.write("PRI * HTTP/2.0\r\n\r\n".getBytes(StandardCharsets.ISO_8859_1));
        os.flush();
        try {
            // Make the parser read something.
            parser.readFrame();
        } catch (IOException ioe) {
            // Expected because the server is going to drop the connection.
        }
    }


    @Test(timeout = 10000)
    public void testConnectionInvalidPrefaceStart() throws Exception {
        setupAsFarAsUpgrade();

        // If we send an incomplete preface the server should kill the
        // connection.
        os.write("xxxxxxxxx-xxxxxxxxx-xxxxxxxxx-xxxxxxxxxx".getBytes(StandardCharsets.ISO_8859_1));
        os.flush();
        try {
            // Make the parser read something.
            parser.readFrame();
        } catch (IOException ioe) {
            // Expected because the server is going to drop the connection.
        }
    }


    @Test
    public void testConnectionUpgradeFirstResponse() throws Exception {
        super.http2Connect();
    }


    private void setupAsFarAsUpgrade() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade();
    }


    // ------------------------------------------------------------ Section 3.2.1

    @Test
    public void testZeroHttp2Settings() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade(DEFAULT_CONNECTION_HEADER_VALUE, "h2c", "", false);
        parseHttp11Response();
    }


    @Test
    public void testMultipleHttp2Settings() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade(DEFAULT_CONNECTION_HEADER_VALUE, "h2c", EMPTY_HTTP2_SETTINGS_HEADER + EMPTY_HTTP2_SETTINGS_HEADER,
                false);
        parseHttp11Response();
    }


    @Test
    public void testMissingConnectionValue() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade("Upgrade", "h2c", EMPTY_HTTP2_SETTINGS_HEADER, false);
        parseHttp11Response();
    }


    @Test
    public void testSplitConnectionValue01() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade("Upgrade\r\nConnection: HTTP2-Settings", "h2c", EMPTY_HTTP2_SETTINGS_HEADER, true);
        sendClientPreface();
        validateHttp2InitialResponse();
    }


    @Test
    public void testSplitConnectionValue02() throws Exception {
        enableHttp2();
        configureAndStartWebApplication();
        openClientConnection();
        doHttpUpgrade("HTTP2-Settings\r\nConnection: Upgrade", "h2c", EMPTY_HTTP2_SETTINGS_HEADER, true);
        sendClientPreface();
        validateHttp2InitialResponse();
    }

    // No need to test how trailing '=' are handled here. HTTP2Settings payloads
    // are always a multiple of 6 long which means valid payloads never end in
    // '='. Invalid payloads will be rejected anyway.
}