/*
 *  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 org.junit.Assert;
import org.junit.Test;

/**
 * Unit tests for Section 6.5 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_6_5 extends Http2TestBase {


    @Test
    public void testSettingsFrameNonEmptAck() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendSettings(0, true, new SettingValue(1, 1));

        handleGoAwayResponse(1, Http2Error.FRAME_SIZE_ERROR);
    }


    @Test
    public void testSettingsFrameNonZeroStream() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendPriority(3, 0, 15);
        sendSettings(3, true, new SettingValue(1, 1));

        handleGoAwayResponse(1);
    }


    @Test
    public void testSettingsFrameWrongLength() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        byte[] resetFrame = new byte[10];
        // length
        ByteUtil.setThreeBytes(resetFrame, 0, 1);
        // type
        resetFrame[3] = FrameType.SETTINGS.getIdByte();
        // No flags
        // Stream ID 0

        // Payload - left as zero

        os.write(resetFrame);
        os.flush();

        handleGoAwayResponse(1, Http2Error.FRAME_SIZE_ERROR);
    }


    @Test
    public void testSettingsFrameInvalidPushSetting() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendSettings(0, false, new SettingValue(0x2, 0x2));

        handleGoAwayResponse(1);
    }


    @Test
    public void testSettingsFrameInvalidWindowSizeSetting() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendSettings(0, false, new SettingValue(0x4, 1 << 31));

        handleGoAwayResponse(1, Http2Error.FLOW_CONTROL_ERROR);
    }


    @Test
    public void testSettingsFrameInvalidMaxFrameSizeSetting() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendSettings(0, false, new SettingValue(0x5, 1 << 31));

        handleGoAwayResponse(1);
    }


    @Test
    public void testSettingsUnknownSetting() throws Exception {
        // HTTP2 upgrade
        http2Connect();

        sendSettings(0, false, new SettingValue(0xFF, 0xFF));

        // Ack
        parser.readFrame();

        Assert.assertTrue(output.getTrace(), output.getTrace().startsWith("0-Settings-Ack"));
    }

    // delayed ACKs. Requires an API (TBD) for applications to send settings.
}
