Implement command registry

src/main/java/com/aizistral/infmachine/commands/Command.java

@@ -0,0 +1,16 @@
+package com.aizistral.infmachine.commands;
+
+import java.util.List;
+
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.build.SlashCommandData;
+
+public interface Command {
+
+    public String getName();
+
+    public SlashCommandData getData();
+
+    public void onEvent(SlashCommandInteractionEvent event);
+
+}

src/main/java/com/aizistral/infmachine/commands/CommandOption.java

@@ -0,0 +1,11 @@
+package com.aizistral.infmachine.commands;
+
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+
+public record CommandOption(OptionType type, String name, String description, boolean required) {
+
+    public CommandOption(OptionType type, String name, String description) {
+        this(type, name, description, true);
+    }
+
+}

src/main/java/com/aizistral/infmachine/commands/CommandRegistry.java

@@ -0,0 +1,65 @@
+package com.aizistral.infmachine.commands;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.aizistral.infmachine.Bootstrap;
+import com.aizistral.infmachine.config.Localization;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.RequiredArgsConstructor;
+import net.dv8tion.jda.api.events.GenericEvent;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.hooks.EventListener;
+import net.dv8tion.jda.api.interactions.commands.build.SlashCommandData;
+
+public class CommandRegistry implements EventListener {
+    @Getter
+    private static CommandRegistry instance;
+    private final Map<String, Command> commands = new HashMap<>();
+
+    private CommandRegistry() {
+        // NO-OP
+    }
+
+    private void populate() {
+        this.register(new PingCommand());
+    }
+
+    private void register(Command command) {
+        this.commands.put(command.getData().getName(), command);
+    }
+
+    private void sendUpdate() {
+        Bootstrap.JDA.updateCommands().addCommands(this.commands.values().stream().map(Command::getData).toList()).queue();
+    }
+
+    @Override
+    public void onEvent(GenericEvent event) {
+        if (event instanceof SlashCommandInteractionEvent slashEvent) {
+            Command command = this.commands.get(slashEvent.getName());
+
+            if (command != null) {
+                command.onEvent(slashEvent);
+            } else {
+                slashEvent.reply(Localization.get("msg.commandNotFound")).queue();
+            }
+        }
+    }
+
+    public static void bootstrap() {
+        Preconditions.checkArgument(instance == null, "CommandRegistry already bootstrapped!");
+
+        instance = new CommandRegistry();
+        instance.populate();
+        instance.sendUpdate();
+        Bootstrap.JDA.addEventListener(instance);
+    }
+
+}

src/main/java/com/aizistral/infmachine/commands/PingCommand.java

@@ -0,0 +1,28 @@
+package com.aizistral.infmachine.commands;
+
+import com.aizistral.infmachine.config.Localization;
+
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
+import net.dv8tion.jda.api.interactions.commands.build.SlashCommandData;
+
+public class PingCommand implements Command {
+
+    @Override
+    public String getName() {
+        return "ping";
+    }
+
+    @Override
+    public SlashCommandData getData() {
+        return Commands.slash("ping", Localization.get("cmd.ping.desc"));
+    }
+
+    @Override
+    public void onEvent(SlashCommandInteractionEvent event) {
+        long time = System.currentTimeMillis();
+        event.reply("Pong!").setEphemeral(false).flatMap(v -> event.getHook().editOriginalFormat(
+                "Pong: %d ms", System.currentTimeMillis() - time)).queue();
+    }
+
+}

src/main/resources/lang/local.lang

@@ -67,3 +67,4 @@ msg.openVotingSuccess=Succesfully opened voting for user <@%s>!
 msg.openVotingFail=Failed to open a new voting for user <@%s>. Is there one already?
 msg.ratingOwn=## Your Rating Stats:\n\nLeaderboard position (by rating): **#%s**\nTotal rating acquired: **%s points**\n\nLeaderboard position (by messages): **#%s**\nTotal messages sent: **%s messages**
 msg.rating=## <@%s>'s Rating Stats:\n\nLeaderboard position (by rating): **#%s**\nTotal rating acquired: **%s points**\n\nLeaderboard position (by messages): **#%s**\nTotal messages sent: **%s messages**
+msg.commandNotFound=I know no such command...