/*
 * Decompiled with CFR 0.152.
 * 
 * Could not load the following classes:
 *  com.mojang.logging.LogUtils
 *  org.jspecify.annotations.Nullable
 *  org.slf4j.Logger
 */
package net.minecraft.client.server;

import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.atomic.AtomicInteger;
import net.minecraft.DefaultUncaughtExceptionHandler;
import org.jspecify.annotations.Nullable;
import org.slf4j.Logger;

public class LanServerPinger
extends Thread {
    private static final AtomicInteger UNIQUE_THREAD_ID = new AtomicInteger(0);
    private static final Logger LOGGER = LogUtils.getLogger();
    public static final String MULTICAST_GROUP = "224.0.2.60";
    public static final int PING_PORT = 4445;
    private static final long PING_INTERVAL = 1500L;
    private final String motd;
    private final DatagramSocket socket;
    private boolean isRunning = true;
    private final String serverAddress;

    public LanServerPinger(String motd, String serverAddress) throws IOException {
        super("LanServerPinger #" + UNIQUE_THREAD_ID.incrementAndGet());
        this.motd = motd;
        this.serverAddress = serverAddress;
        this.setDaemon(true);
        this.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(LOGGER));
        this.socket = new DatagramSocket();
    }

    @Override
    public void run() {
        String pingString = LanServerPinger.createPingString(this.motd, this.serverAddress);
        byte[] ping = pingString.getBytes(StandardCharsets.UTF_8);
        while (!this.isInterrupted() && this.isRunning) {
            try {
                InetAddress group = InetAddress.getByName(MULTICAST_GROUP);
                DatagramPacket packet = new DatagramPacket(ping, ping.length, group, 4445);
                this.socket.send(packet);
            }
            catch (IOException e) {
                LOGGER.warn("LanServerPinger: {}", (Object)e.getMessage());
                break;
            }
            try {
                LanServerPinger.sleep(1500L);
            }
            catch (InterruptedException interruptedException) {}
        }
    }

    @Override
    public void interrupt() {
        super.interrupt();
        this.isRunning = false;
    }

    public static String createPingString(String motd, String address) {
        return "[MOTD]" + motd + "[/MOTD][AD]" + address + "[/AD]";
    }

    public static String parseMotd(String pingString) {
        int startIndex = pingString.indexOf("[MOTD]");
        if (startIndex < 0) {
            return "missing no";
        }
        int endIndex = pingString.indexOf("[/MOTD]", startIndex + "[MOTD]".length());
        if (endIndex < startIndex) {
            return "missing no";
        }
        return pingString.substring(startIndex + "[MOTD]".length(), endIndex);
    }

    public static @Nullable String parseAddress(String pingString) {
        int endMotdIndex = pingString.indexOf("[/MOTD]");
        if (endMotdIndex < 0) {
            return null;
        }
        int secondEndMotdIndex = pingString.indexOf("[/MOTD]", endMotdIndex + "[/MOTD]".length());
        if (secondEndMotdIndex >= 0) {
            return null;
        }
        int startIndex = pingString.indexOf("[AD]", endMotdIndex + "[/MOTD]".length());
        if (startIndex < 0) {
            return null;
        }
        int endIndex = pingString.indexOf("[/AD]", startIndex + "[AD]".length());
        if (endIndex < startIndex) {
            return null;
        }
        return pingString.substring(startIndex + "[AD]".length(), endIndex);
    }
}