checkpoint

src/utils/cache.ts

@@ -0,0 +1,57 @@
+type CacheEntry<T> = {
+  value: T
+  timestamp: number
+}
+
+const CACHE_KEY = "podtui_cache"
+const DEFAULT_TTL = 1000 * 60 * 60
+
+const loadCache = (): Record<string, CacheEntry<unknown>> => {
+  if (typeof localStorage === "undefined") return {}
+  try {
+    const raw = localStorage.getItem(CACHE_KEY)
+    return raw ? (JSON.parse(raw) as Record<string, CacheEntry<unknown>>) : {}
+  } catch {
+    return {}
+  }
+}
+
+const saveCache = (cache: Record<string, CacheEntry<unknown>>) => {
+  if (typeof localStorage === "undefined") return
+  try {
+    localStorage.setItem(CACHE_KEY, JSON.stringify(cache))
+  } catch {
+    // ignore
+  }
+}
+
+const cache = loadCache()
+
+export const cacheValue = <T,>(key: string, value: T) => {
+  cache[key] = { value, timestamp: Date.now() }
+  saveCache(cache)
+}
+
+export const getCachedValue = <T,>(key: string, ttl = DEFAULT_TTL): T | null => {
+  const entry = cache[key] as CacheEntry<T> | undefined
+  if (!entry) return null
+  if (Date.now() - entry.timestamp > ttl) {
+    delete cache[key]
+    saveCache(cache)
+    return null
+  }
+  return entry.value
+}
+
+export const invalidateCache = (prefix?: string) => {
+  if (!prefix) {
+    Object.keys(cache).forEach((key) => delete cache[key])
+    saveCache(cache)
+    return
+  }
+
+  Object.keys(cache)
+    .filter((key) => key.startsWith(prefix))
+    .forEach((key) => delete cache[key])
+  saveCache(cache)
+}