fix: download speed

utils/downloadStats.ts

@@ -0,0 +1,51 @@
+export function formatSpeed(bytesPerSecond: number | undefined): string {
+  if (!bytesPerSecond || bytesPerSecond <= 0) return "N/A";
+
+  const mbps = bytesPerSecond / (1024 * 1024);
+  if (mbps >= 1) {
+    return `${mbps.toFixed(2)} MB/s`;
+  }
+
+  const kbps = bytesPerSecond / 1024;
+  return `${kbps.toFixed(0)} KB/s`;
+}
+
+export function formatETA(
+  bytesDownloaded: number | undefined,
+  totalBytes: number | undefined,
+  speed: number | undefined,
+): string {
+  if (!bytesDownloaded || !totalBytes || !speed || speed <= 0) {
+    return "Calculating...";
+  }
+
+  const remainingBytes = totalBytes - bytesDownloaded;
+  if (remainingBytes <= 0) return "0s";
+
+  const secondsRemaining = remainingBytes / speed;
+
+  if (secondsRemaining < 60) {
+    return `${Math.ceil(secondsRemaining)}s`;
+  }
+  if (secondsRemaining < 3600) {
+    const minutes = Math.floor(secondsRemaining / 60);
+    const seconds = Math.ceil(secondsRemaining % 60);
+    return `${minutes}m ${seconds}s`;
+  }
+  const hours = Math.floor(secondsRemaining / 3600);
+  const minutes = Math.floor((secondsRemaining % 3600) / 60);
+  return `${hours}h ${minutes}m`;
+}
+
+export function calculateETA(
+  bytesDownloaded: number | undefined,
+  totalBytes: number | undefined,
+  speed: number | undefined,
+): number | undefined {
+  if (!bytesDownloaded || !totalBytes || !speed || speed <= 0) {
+    return undefined;
+  }
+
+  const remainingBytes = totalBytes - bytesDownloaded;
+  return remainingBytes / speed; // seconds
+}