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src/lib/youtubeLinks.ts

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+/**
+ * YouTube channel linking helpers.
+ * Stores a mapping of Twitch channel ID -> YouTube channel URL in localStorage.
+ */
+
+const STORAGE_KEY = "mixchat_youtube_links";
+
+export interface YouTubeLink {
+  twitchChannelId: string;
+  twitchDisplayName: string;
+  youtubeUrl: string;
+}
+
+export function getYoutubeLinks(): YouTubeLink[] {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    return raw ? JSON.parse(raw) : [];
+  } catch {
+    return [];
+  }
+}
+
+export function addYoutubeLink(link: YouTubeLink): void {
+  const links = getYoutubeLinks();
+  // Replace if already exists for this twitch channel
+  const idx = links.findIndex(
+    (l) => l.twitchChannelId === link.twitchChannelId,
+  );
+  if (idx >= 0) {
+    links[idx] = link;
+  } else {
+    links.push(link);
+  }
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(links));
+}
+
+export function removeYoutubeLink(twitchChannelId: string): void {
+  const links = getYoutubeLinks().filter(
+    (l) => l.twitchChannelId !== twitchChannelId,
+  );
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(links));
+}
+
+export function getYoutubeLinkForChannel(
+  twitchChannelId: string,
+): string | null {
+  const links = getYoutubeLinks();
+  const found = links.find((l) => l.twitchChannelId === twitchChannelId);
+  return found?.youtubeUrl ?? null;
+}