feat: add registerable events

src/bot.ts

@@ -1,5 +1,4 @@
 import {
-    BaseInteraction,
     CacheType,
     Client,
     GatewayIntentBits,
@@ -12,6 +11,13 @@ import {
 import { Logger } from './utils/log';
 import { config } from './utils/config';
 
+type BotEventListeners = {
+    'messageCreate': (message: Message) => void;
+    'interactionCreate': (interaction: Interaction) => void;
+    'voiceStateUpdate': (oldState: VoiceState, newState: VoiceState) => void;
+};
+type BotEventListener<K extends keyof BotEventListeners> = BotEventListeners[K];
+
 export class Bot {
     private client: Client | undefined;
 
@@ -20,6 +26,66 @@ export class Bot {
 
     private readonly log: Logger;
 
+    private eventListeners: {
+        [K in keyof BotEventListeners]?: BotEventListener<K>[];
+    } = {};
+
+    /*
+        event methods
+    */
+     public on<K extends keyof BotEventListeners>(
+        event: K, 
+        listener: BotEventListener<K>
+    ): void {
+        if (!this.eventListeners[event]) {
+            this.eventListeners[event] = [];
+        }
+        (this.eventListeners[event] as BotEventListener<K>[]).push(listener);
+    }
+
+    public off<K extends keyof BotEventListeners>(
+        event: K, 
+        listener: BotEventListener<K>
+    ): boolean {
+        const listeners = this.eventListeners[event];
+        if (!listeners) return false;
+
+        const index = (listeners as BotEventListener<K>[]).indexOf(listener);
+        if (index > -1) {
+            (listeners as BotEventListener<K>[]).splice(index, 1);
+            return true;
+        }
+        return false;
+    }
+
+    public once<K extends keyof BotEventListeners>(
+        event: K, 
+        listener: BotEventListener<K>
+    ): void {
+        const onceWrapper = ((...args: Parameters<BotEventListener<K>>) => {
+            this.off(event, onceWrapper as BotEventListener<K>);
+            (listener as (...args: unknown[]) => void)(...args);
+        }) as BotEventListener<K>;
+        
+        this.on(event, onceWrapper);
+    }
+
+    private emit<K extends keyof BotEventListeners>(
+        event: K, 
+        ...args: Parameters<BotEventListener<K>>
+    ): void {
+        const listeners = this.eventListeners[event];
+        if (listeners) {
+            for (const listener of listeners as BotEventListener<K>[]) {
+                try {
+                    (listener as (...args: unknown[]) => void)(...args);
+                } catch (error) {
+                    this.log.error(`Error in event listener for ${String(event)}:`, error);
+                }
+            }
+        }
+    }
+
     /*
         class methods
     */
@@ -100,16 +166,20 @@ export class Bot {
                 error.stack
             );
     }
-    private async onInteraction(interaction: BaseInteraction): Promise<void> {
 
+    /*
+        public event listeners
+    */
+    private async onInteraction(interaction: Interaction): Promise<void> {
+        this.emit('interactionCreate', interaction);
     }
 
-    private async onMessage(message: Message<boolean>): Promise<void> {
-
+    private async onMessage(message: Message): Promise<void> {
+        this.emit('messageCreate', message);
     }
 
     private async onVoiceStateUpdate(oldState: VoiceState, newState: VoiceState): Promise<void> {
-
+        this.emit('voiceStateUpdate', oldState, newState);
     }
 
     /*