fix: reconcile tags when changes occur

package.json

@@ -22,7 +22,8 @@
   "dependencies": {
     "@uwu/configmasher": "latest",
     "discord.js": "^14.15.3",
-    "ofetch": "^1.4.1"
+    "ofetch": "^1.4.1",
+    "throttle-debounce": "^5.0.2"
   },
   "trustedDependencies": [
     "@biomejs/biome"

src/commands/util/close.ts

@@ -17,6 +17,17 @@ import {
 const getStateWord = (close) => (close ? "closed" : "reopened");
 const getStateVerb = (close) => (close ? "close" : "reopen");
 
+export function getTagsForCloseState(close: boolean) {
+  return {
+    tagToAdd: close
+      ? config.helpChannel.closedTag
+      : config.helpChannel.openedTag,
+    tagToRemove: close
+      ? config.helpChannel.openedTag
+      : config.helpChannel.closedTag,
+  };
+}
+
 export async function handleIssueState(
   interaction: ChatInputCommandInteraction,
   close = true,
@@ -29,12 +40,7 @@ export async function handleIssueState(
   const stateWord = getStateWord(close);
   const stateVerb = getStateVerb(close);
 
-  const tagToAdd = close
-    ? config.helpChannel.closedTag
-    : config.helpChannel.openedTag;
-  const tagToRemove = close
-    ? config.helpChannel.openedTag
-    : config.helpChannel.closedTag;
+  const { tagToAdd, tagToRemove } = getTagsForCloseState(close);
 
   const postTags = threadChannel.appliedTags;
 

src/events/channels.ts

@@ -0,0 +1,80 @@
+import { config } from "../lib/config.js";
+import { getTagsForCloseState } from "../commands/util/close.js";
+import { isHelpPost } from "../lib/discord/channels.js";
+
+import { debounce } from "throttle-debounce";
+
+import { type Client, Events, type ThreadChannel } from "discord.js";
+
+// Map to store initial thread states
+const threadUpdateMap = new Map<string, ThreadChannel>();
+
+// Create a debounced handler for processing thread updates
+const handleEvent = debounce(
+  1000,
+  async (threadId: string, newThread: ThreadChannel) => {
+    const initialThread = threadUpdateMap.get(threadId);
+    if (!initialThread) return;
+
+    // Remove from map
+    threadUpdateMap.delete(threadId);
+
+    // Handle tag additions
+    const addedTags = newThread.appliedTags.filter(
+      (t) => !initialThread.appliedTags.includes(t),
+    );
+    if (addedTags.length > 0) {
+      for (const tag of addedTags) {
+        // If closed/opened tag is added, remove the opposite tag
+        if (
+          tag === config.helpChannel.closedTag ||
+          tag === config.helpChannel.openedTag
+        ) {
+          const isClose = tag === config.helpChannel.closedTag;
+          const { tagToRemove } = getTagsForCloseState(isClose);
+          if (newThread.appliedTags.includes(tagToRemove)) {
+            await newThread.setAppliedTags(
+              newThread.appliedTags.filter((t) => t !== tagToRemove),
+            );
+          }
+        }
+      }
+    }
+
+    // Handle tag removals
+    const removedTags = initialThread.appliedTags.filter(
+      (t) => !newThread.appliedTags.includes(t),
+    );
+    if (removedTags.length > 0) {
+      for (const tag of removedTags) {
+        // If closed or opened tag is removed, add it back only if its opposite isn't present
+        if (
+          tag === config.helpChannel.closedTag ||
+          tag === config.helpChannel.openedTag
+        ) {
+          const isClose = tag === config.helpChannel.closedTag;
+          const { tagToRemove } = getTagsForCloseState(isClose);
+          if (!newThread.appliedTags.includes(tagToRemove)) {
+            await newThread.setAppliedTags([...newThread.appliedTags, tag]);
+          }
+        }
+      }
+    }
+  },
+);
+
+export default function registerEvents(client: Client) {
+  client.on(Events.ThreadUpdate, async (oldThread, newThread) => {
+    if (!(await isHelpPost(newThread))) {
+      return;
+    }
+
+    // Store the initial state if this is the first update
+    if (!threadUpdateMap.has(newThread.id)) {
+      threadUpdateMap.set(newThread.id, oldThread);
+    }
+
+    // Trigger the debounced handler
+    handleEvent(newThread.id, newThread);
+  });
+}

src/index.ts

@@ -3,6 +3,7 @@ import { config } from "./lib/config.js";
 import registerCommandEvents from "./events/commands.js";
 import registerWalkthroughEvents from "./events/walkthrough.js";
 import registerMessageEvents from "./events/messages.js";
+import registerChannelEvents from "./events/channels.js";
 
 import { Client, Events, GatewayIntentBits, ActivityType } from "discord.js";
 
@@ -37,6 +38,7 @@ client.once(Events.ClientReady, () => {
   registerCommandEvents(client);
   registerWalkthroughEvents(client);
   registerMessageEvents(client);
+  registerChannelEvents(client);
 
   shufflePresence();
   setInterval(shufflePresence, config.presenceDelay);