/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */
package org.elasticsearch.transport;

import org.apache.logging.log4j.Level;
import org.elasticsearch.TransportVersion;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.RecyclerBytesStreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.PageCacheRecycler;
import org.elasticsearch.common.util.concurrent.ThreadContext;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.MockLog;
import org.elasticsearch.test.junit.annotations.TestLogging;

import java.io.IOException;

import static org.mockito.Mockito.mock;

@TestLogging(value = "org.elasticsearch.transport.TransportLogger:trace", reason = "to ensure we log network events on TRACE level")
public class TransportLoggerTests extends ESTestCase {

    public void testLoggingHandler() throws IOException {
        final String writePattern = ".*\\[length: \\d+"
            + ", request id: \\d+"
            + ", type: request"
            + ", version: .*"
            + ", header size: \\d+B"
            + ", action: internal:test]"
            + " WRITE: \\d+B";
        final MockLog.LoggingExpectation writeExpectation = new MockLog.PatternSeenEventExpectation(
            "hot threads request",
            TransportLogger.class.getCanonicalName(),
            Level.TRACE,
            writePattern
        );

        final String readPattern = ".*\\[length: \\d+"
            + ", request id: \\d+"
            + ", type: request"
            + ", version: .*"
            + ", header size: \\d+B"
            + ", action: internal:test]"
            + " READ: \\d+B";

        final MockLog.LoggingExpectation readExpectation = new MockLog.PatternSeenEventExpectation(
            "cluster state request",
            TransportLogger.class.getCanonicalName(),
            Level.TRACE,
            readPattern
        );

        try (var mockLog = MockLog.capture(TransportLogger.class)) {
            mockLog.addExpectation(writeExpectation);
            mockLog.addExpectation(readExpectation);
            BytesReference bytesReference = buildRequest();
            TransportLogger.logInboundMessage(mock(TcpChannel.class), bytesReference.slice(6, bytesReference.length() - 6));
            TransportLogger.logOutboundMessage(mock(TcpChannel.class), bytesReference);
            mockLog.assertAllExpectationsMatched();
        }
    }

    private BytesReference buildRequest() throws IOException {
        BytesRefRecycler recycler = new BytesRefRecycler(PageCacheRecycler.NON_RECYCLING_INSTANCE);
        Compression.Scheme compress = randomFrom(Compression.Scheme.DEFLATE, Compression.Scheme.LZ4, null);
        try (RecyclerBytesStreamOutput bytesStreamOutput = new RecyclerBytesStreamOutput(recycler)) {
            return OutboundHandler.serialize(
                OutboundHandler.MessageDirection.REQUEST,
                "internal:test",
                randomInt(30),
                false,
                TransportVersion.current(),
                compress,
                new EmptyRequest(),
                new ThreadContext(Settings.EMPTY),
                bytesStreamOutput
            );
        }
    }
}