refactor: consolidate reply/media helpers

src/telegram/voice.ts

@@ -1,4 +1,4 @@
-import path from "node:path";
+import { getFileExtension } from "../media/mime.js";
 
 export function isTelegramVoiceCompatible(opts: {
   contentType?: string | null;
@@ -10,7 +10,8 @@ export function isTelegramVoiceCompatible(opts: {
   }
   const fileName = opts.fileName?.trim();
   if (!fileName) return false;
-  const ext = path.extname(fileName).toLowerCase();
+  const ext = getFileExtension(fileName);
+  if (!ext) return false;
   return ext === ".ogg" || ext === ".opus" || ext === ".oga";
 }
 
@@ -28,3 +29,18 @@ export function resolveTelegramVoiceDecision(opts: {
     reason: `media is ${contentType} (${fileName})`,
   };
 }
+
+export function resolveTelegramVoiceSend(opts: {
+  wantsVoice: boolean;
+  contentType?: string | null;
+  fileName?: string | null;
+  logFallback?: (message: string) => void;
+}): { useVoice: boolean } {
+  const decision = resolveTelegramVoiceDecision(opts);
+  if (decision.reason && opts.logFallback) {
+    opts.logFallback(
+      `Telegram voice requested but ${decision.reason}; sending as audio file instead.`,
+    );
+  }
+  return { useVoice: decision.useVoice };
+}