Feat: Downloads Auto-Retry Button & Toast Enhancements

src/features/downloads/lib/autoRetry.ts

@@ -0,0 +1,39 @@
+import type { DownloadQueueItem } from "@types/index";
+
+const RETRY_DELAY_MS = 20_000;
+
+export interface AutoRetryHandle {
+  stop: () => void;
+}
+
+export function startAutoRetry(
+  getQueue:    () => DownloadQueueItem[],
+  isRunning:   () => boolean,
+  retryErrored: () => Promise<void>,
+): AutoRetryHandle {
+  let stopped = false;
+  let timer:   ReturnType<typeof setTimeout> | null = null;
+
+  async function tick() {
+    if (stopped) return;
+
+    const queue   = getQueue();
+    const errored = queue.filter(i => i.state === "ERROR");
+    const active  = queue.filter(i => i.state !== "ERROR");
+
+    if (errored.length > 0 && active.length === 0 && !isRunning()) {
+      await retryErrored().catch(() => {});
+    }
+
+    if (!stopped) timer = setTimeout(tick, RETRY_DELAY_MS);
+  }
+
+  timer = setTimeout(tick, RETRY_DELAY_MS);
+
+  return {
+    stop() {
+      stopped = true;
+      if (timer !== null) { clearTimeout(timer); timer = null; }
+    },
+  };
+}