feat: add IRC

1 files changed, 199 insertions, 0 deletions

diff --git a/src/main/java/dev/plutorocks/IrcClient.java b/src/main/java/dev/plutorocks/IrcClient.java
new file mode 100644
index 0000000..f3abd40
--- /dev/null
+++ b/src/main/java/dev/plutorocks/IrcClient.java
@@ -0,0 +1,199 @@
+package dev.plutorocks;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.text.MutableText;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+
+import java.io.*;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+
+public class IrcClient {
+
+    private final String host;
+    private final int port;
+    private final String channel;
+    private final String nick;
+
+    private volatile boolean running = false;
+    private volatile boolean connected = false;
+
+    private Socket socket;
+    private BufferedWriter writer;
+
+    public IrcClient(String host, int port, String channel, String nick) {
+        this.host = host;
+        this.port = port;
+        this.channel = channel.startsWith("#") ? channel : "#" + channel;
+        this.nick = nick;
+    }
+
+    /**
+     * start the IRC thread.
+     */
+    public void connect() {
+        if (running) return;
+        running = true;
+
+        Thread thread = new Thread(this::runLoop, "MinecraftIRC-Thread");
+        thread.setDaemon(true);
+        thread.start();
+    }
+
+    public boolean isConnected() {
+        return connected;
+    }
+
+    public void disconnect() {
+        running = false;
+        try {
+            if (socket != null && !socket.isClosed()) {
+                socket.close();
+            }
+        } catch (IOException ignored) {}
+        connected = false;
+    }
+
+    private void runLoop() {
+        try (Socket sock = new Socket(host, port);
+             BufferedReader reader = new BufferedReader(
+                     new InputStreamReader(sock.getInputStream(), StandardCharsets.UTF_8));
+             BufferedWriter writer = new BufferedWriter(
+                     new OutputStreamWriter(sock.getOutputStream(), StandardCharsets.UTF_8))) {
+
+            this.socket = sock;
+            this.writer = writer;
+            this.connected = true;
+
+            sendRaw("NICK " + nick);
+            sendRaw("USER " + nick + " 0 * :" + nick);
+
+            sendRaw("JOIN " + channel);
+
+            sendClientChat(
+                    Text.literal("[IRC] ").formatted(Formatting.AQUA)
+                            .append(Text.literal("Connected to " + host + " " + channel + " as " + nick)
+                                    .formatted(Formatting.GRAY))
+            );
+
+            String line;
+            while (running && (line = reader.readLine()) != null) {
+                handleLine(line);
+            }
+
+            if (running) {
+                sendClientChat(
+                        Text.literal("[IRC] ").formatted(Formatting.AQUA)
+                                .append(Text.literal("Disconnected from server. Use /irc connect to reconnect.")
+                                        .formatted(Formatting.GRAY))
+                );
+            }
+
+        } catch (IOException e) {
+            sendClientChat(
+                    Text.literal("[IRC] ").formatted(Formatting.AQUA)
+                            .append(Text.literal("Connection error: " + e.getMessage()
+                                            + " (use /irc connect to try again)")
+                                    .formatted(Formatting.GRAY))
+            );
+        } finally {
+            connected = false;
+            running = false;
+        }
+    }
+
+    private void handleLine(String line) {
+        // respond to server PINGs
+        if (line.startsWith("PING")) {
+            String payload = line.length() > 5 ? line.substring(5) : "";
+            sendRaw("PONG " + payload);
+            return;
+        }
+
+        // only care about PRIVMSG
+        if (!line.contains(" PRIVMSG ")) {
+            return;
+        }
+
+        int prefixEnd = line.indexOf(' ');
+        if (!line.startsWith(":") || prefixEnd <= 1) {
+            return;
+        }
+
+        String prefix = line.substring(1, prefixEnd);
+
+        String nick = prefix;
+        int bang = prefix.indexOf('!');
+        if (bang != -1) {
+            nick = prefix.substring(0, bang);
+        }
+
+        String[] split = line.split(" :", 2);
+        if (split.length < 2) {
+            return;
+        }
+
+        String trailing = split[1];
+        String commandPart = split[0];
+
+        String[] cmdParts = commandPart.split(" ");
+        if (cmdParts.length < 3) {
+            return;
+        }
+
+        String target = cmdParts[2];
+
+        if (!target.equalsIgnoreCase(this.channel)
+                && !target.equalsIgnoreCase(this.nick)) {
+            return;
+        }
+
+        MutableText prefixText = Text.literal("[IRC] ")
+                .formatted(Formatting.AQUA);
+        MutableText nickText = Text.literal("<" + nick + "> ")
+                .formatted(Formatting.WHITE);
+        MutableText msgText = Text.literal(trailing)
+                .formatted(Formatting.WHITE);
+
+        sendClientChat(prefixText.append(nickText).append(msgText));
+    }
+
+    /**
+     * sends a message to the configured channel
+     */
+    public void sendChannelMessage(String message) {
+        if (!connected) return;
+        sendRaw("PRIVMSG " + channel + " :" + message);
+    }
+
+    /**
+     * low-level raw IRC send
+     */
+    private synchronized void sendRaw(String line) {
+        if (writer == null) return;
+        try {
+            writer.write(line);
+            writer.write("\r\n");
+            writer.flush();
+        } catch (IOException e) {
+            sendClientChat(
+                    Text.literal("[IRC] ").formatted(Formatting.AQUA)
+                            .append(Text.literal("Send error: " + e.getMessage())
+                                    .formatted(Formatting.GRAY))
+            );
+            disconnect();
+        }
+    }
+
+    private void sendClientChat(Text text) {
+        MinecraftClient client = MinecraftClient.getInstance();
+        if (client == null) return;
+
+        client.execute(() -> {
+            if (client.inGameHud != null) {
+                client.inGameHud.getChatHud().addMessage(text);
+            }
+        });
+    }
+}
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