Update to artist credit handling

src/queue.rs

@@ -39,15 +39,39 @@ const RETRY_DELAYS: [Duration; 3] = [
     Duration::from_secs(600),
 ];
 
+/// Progress callback: (current, total, message).
+pub type ProgressFn = Box<dyn Fn(u64, u64, &str) + Send + Sync>;
+
 /// Process all pending items in the download queue.
 pub async fn run_queue(
     conn: &DatabaseConnection,
     backend: &impl DownloadBackend,
     config: &BackendConfig,
     dry_run: bool,
+) -> DlResult<DlStats> {
+    run_queue_with_progress(conn, backend, config, dry_run, None).await
+}
+
+/// Process all pending items in the download queue, with optional progress reporting.
+pub async fn run_queue_with_progress(
+    conn: &DatabaseConnection,
+    backend: &impl DownloadBackend,
+    config: &BackendConfig,
+    dry_run: bool,
+    on_progress: Option<ProgressFn>,
 ) -> DlResult<DlStats> {
     let mut stats = DlStats::default();
 
+    // Count total for progress reporting
+    let total = queries::downloads::list(conn, Some(DownloadStatus::Pending))
+        .await
+        .map(|v| v.len() as u64)
+        .unwrap_or(0);
+
+    if let Some(ref cb) = on_progress {
+        cb(0, total, "Starting downloads...");
+    }
+
     loop {
         let item = match queries::downloads::get_next_pending(conn).await? {
             Some(item) => item,
@@ -56,6 +80,10 @@ pub async fn run_queue(
 
         stats.downloads_attempted += 1;
 
+        if let Some(ref cb) = on_progress {
+            cb(stats.downloads_attempted, total, &format!("Downloading: {}", item.query));
+        }
+
         tracing::info!(
             id = item.id,
             query = %item.query,