Add favorites

frontend/src/utils/favorites.ts

@@ -0,0 +1,82 @@
+/**
+ * localStorage utilities for managing favorite conversations.
+ *
+ * Favorites are stored client-side and displayed in a dedicated section
+ * above channels in the sidebar, always sorted by most recent message.
+ */
+
+const FAVORITES_KEY = 'remoteterm-favorites';
+
+export interface Favorite {
+  type: 'channel' | 'contact';
+  id: string; // channel key or contact public key
+}
+
+/**
+ * Load favorites from localStorage
+ */
+export function loadFavorites(): Favorite[] {
+  try {
+    const stored = localStorage.getItem(FAVORITES_KEY);
+    return stored ? JSON.parse(stored) : [];
+  } catch {
+    return [];
+  }
+}
+
+/**
+ * Save favorites to localStorage
+ */
+function saveFavorites(favorites: Favorite[]): void {
+  try {
+    localStorage.setItem(FAVORITES_KEY, JSON.stringify(favorites));
+  } catch {
+    // localStorage might be full or disabled
+  }
+}
+
+/**
+ * Add a conversation to favorites
+ */
+export function addFavorite(type: 'channel' | 'contact', id: string): Favorite[] {
+  const favorites = loadFavorites();
+  // Check if already favorited
+  if (favorites.some((f) => f.type === type && f.id === id)) {
+    return favorites;
+  }
+  const updated = [...favorites, { type, id }];
+  saveFavorites(updated);
+  return updated;
+}
+
+/**
+ * Remove a conversation from favorites
+ */
+export function removeFavorite(type: 'channel' | 'contact', id: string): Favorite[] {
+  const favorites = loadFavorites();
+  const updated = favorites.filter((f) => !(f.type === type && f.id === id));
+  saveFavorites(updated);
+  return updated;
+}
+
+/**
+ * Check if a conversation is favorited
+ */
+export function isFavorite(
+  favorites: Favorite[],
+  type: 'channel' | 'contact',
+  id: string
+): boolean {
+  return favorites.some((f) => f.type === type && f.id === id);
+}
+
+/**
+ * Toggle a conversation's favorite status
+ */
+export function toggleFavorite(type: 'channel' | 'contact', id: string): Favorite[] {
+  const favorites = loadFavorites();
+  if (favorites.some((f) => f.type === type && f.id === id)) {
+    return removeFavorite(type, id);
+  }
+  return addFavorite(type, id);
+}