refactor: rename controllers to handlers and handlers to helpers (#660)

* refactor: rename controllers to handlers and handlers to helpers

* fmt

src/handlers/channels/CHANNEL_DELETE.ts

@@ -0,0 +1,40 @@
+import { eventHandlers } from "../../bot.ts";
+import {
+  ChannelCreatePayload,
+  ChannelTypes,
+  DiscordPayload,
+} from "../../types/mod.ts";
+import { cacheHandlers } from "../../cache.ts";
+
+export async function handleChannelDelete(data: DiscordPayload) {
+  const payload = data.d as ChannelCreatePayload;
+
+  const cachedChannel = await cacheHandlers.get("channels", payload.id);
+  if (!cachedChannel) return;
+
+  if (cachedChannel.type === ChannelTypes.GUILD_VOICE && payload.guild_id) {
+    const guild = await cacheHandlers.get("guilds", payload.guild_id);
+
+    if (guild) {
+      return Promise.all(guild.voiceStates.map(async (vs, key) => {
+        if (vs.channelID !== payload.id) return;
+
+        // Since this channel was deleted all voice states for this channel should be deleted
+        guild.voiceStates.delete(key);
+
+        const member = await cacheHandlers.get("members", vs.userID);
+        if (!member) return;
+
+        eventHandlers.voiceChannelLeave?.(member, vs.channelID);
+      }));
+    }
+  }
+
+  await cacheHandlers.delete("channels", payload.id);
+  cacheHandlers.forEach("messages", (message) => {
+    if (message.channelID === payload.id) {
+      cacheHandlers.delete("messages", message.id);
+    }
+  });
+  eventHandlers.channelDelete?.(cachedChannel);
+}