partial synch with ph2 updates

2025-11-28 08:45:13 +00:00
parent 8f1aede2e3
commit 3f4bd8d52e
54 changed files with 4395 additions and 488 deletions
@@ -0,0 +1,48 @@
+import { useState, useCallback } from "react";
+
+export function useDownloadQueue(maxConcurrent = 3) {
+    const [queue, setQueue] = useState([]); // queued tasks
+    const [activeCount, setActiveCount] = useState(0);
+    const [statuses, setStatuses] = useState({}); // { id: "idle"|"queued"|"downloading"|"done"|"failed" }
+
+    const scheduleNext = useCallback(() => {
+        setQueue((queueCurr) => {
+            if (activeCount >= maxConcurrent || queueCurr.length === 0)
+                return queueCurr;
+
+            const [task, ...rest] = queueCurr;
+
+            setStatuses((s) => ({ ...s, [task.id]: "downloading" }));
+            setActiveCount((c) => c + 1);
+
+            // Run the download fully in async IIFE
+            (async () => {
+                try {
+                    await task.downloadFn(); // triggers fetch + blob + <a> click
+                    setStatuses((s) => ({ ...s, [task.id]: "done" }));
+                } catch (err) {
+                    console.error(err);
+                    setStatuses((s) => ({ ...s, [task.id]: "failed" }));
+                } finally {
+                    setActiveCount((c) => c - 1);
+                    scheduleNext(); // promote next in queue
+                }
+            })();
+
+            return rest;
+        });
+    }, [activeCount, maxConcurrent]);
+
+    const startDownload = useCallback(
+        (id, downloadFn) => {
+            setStatuses((s) => ({ ...s, [id]: "queued" }));
+            setQueue((curr) => [...curr, { id, downloadFn }]);
+            scheduleNext();
+        },
+        [scheduleNext]
+    );
+
+    const getStatus = useCallback((id) => statuses[id] || "idle", [statuses]);
+
+    return { startDownload, getStatus };
+}