feat: enhance podcast generation with duplicate request prevention and improved UI feedback

surfsense_web/lib/chat/podcast-state.ts

@@ -0,0 +1,74 @@
+/**
+ * Module-level state for tracking active podcast generation.
+ * Used by the new-chat adapter to prevent duplicate podcast requests.
+ */
+
+type PodcastStateListener = (isGenerating: boolean) => void;
+
+let _activePodcastTaskId: string | null = null;
+const _listeners: Set<PodcastStateListener> = new Set();
+
+/**
+ * Check if a podcast is currently being generated
+ */
+export function isPodcastGenerating(): boolean {
+	return _activePodcastTaskId !== null;
+}
+
+/**
+ * Get the active podcast task ID
+ */
+export function getActivePodcastTaskId(): string | null {
+	return _activePodcastTaskId;
+}
+
+/**
+ * Set the active podcast task ID (when podcast generation starts)
+ */
+export function setActivePodcastTaskId(taskId: string): void {
+	_activePodcastTaskId = taskId;
+	notifyListeners();
+}
+
+/**
+ * Clear the active podcast task ID (when podcast generation completes or errors)
+ */
+export function clearActivePodcastTaskId(): void {
+	_activePodcastTaskId = null;
+	notifyListeners();
+}
+
+/**
+ * Subscribe to podcast state changes
+ */
+export function subscribeToPodcastState(listener: PodcastStateListener): () => void {
+	_listeners.add(listener);
+	return () => {
+		_listeners.delete(listener);
+	};
+}
+
+function notifyListeners(): void {
+	const isGenerating = _activePodcastTaskId !== null;
+	for (const listener of _listeners) {
+		listener(isGenerating);
+	}
+}
+
+/**
+ * Check if a message looks like a podcast request
+ */
+export function looksLikePodcastRequest(message: string): boolean {
+	const podcastPatterns = [
+		/\bpodcast\b/i,
+		/\bcreate.*podcast\b/i,
+		/\bgenerate.*podcast\b/i,
+		/\bmake.*podcast\b/i,
+		/\bturn.*into.*podcast\b/i,
+		/\bpodcast.*about\b/i,
+		/\bgive.*podcast\b/i,
+	];
+
+	return podcastPatterns.some((pattern) => pattern.test(message));
+}
+