fix: move iPod track deletion to background thread with progress bar, batch DB sync

src/ipod_nano7_db.py

@@ -436,24 +436,46 @@ class Nano7Database:
         return tracks
 
     def delete_track(self, pid: int) -> bool:
-        """Delete track by pid. Scans for matching file, deletes, re-syncs."""
+        """Delete a single track by pid (scans, deletes, syncs)."""
-        deleted = False
+        return self.delete_tracks([pid]) > 0
-        for s in self._scan_ipod_files():
+
-            if s["pid"] == pid:
+    def delete_tracks(self, pids: list[int], progress_callback=None) -> int:
-                if os.path.exists(s["file_path"]):
+        """Delete tracks by pid.  Scans once, deletes all matching files,
+        then regenerates the database exactly once.
+
+        Args:
+            pids: List of track pids to delete.
+            progress_callback: Optional callable(percent, status) for progress.
+
+        Returns:
+            Number of files actually deleted.
+        """
+        pid_set = set(pids)
+        scanned = self._scan_ipod_files()
+        deleted = 0
+
+        for i, s in enumerate(scanned):
+            if s["pid"] in pid_set and os.path.exists(s["file_path"]):
                 os.remove(s["file_path"])
                 logger.info("Deleted: %s", s["file_path"])
-                deleted = True
+                deleted += 1
-                break
+                pid_set.discard(s["pid"])
-        if deleted:
+            if progress_callback and i % 5 == 0:
-            self.sync_itunescdb()
+                progress_callback(
-            return True
+                    min(50, int((i + 1) / max(len(scanned), 1) * 50)),
-        # Try deleting by file path if pid lookup fails
+                    f"Deleting files... {deleted} removed",
-        # pid might be a negative hash; try all files
+                )
-        logger.warning("No file found for pid=%d", pid)
-        return False
 
-    def remove_duplicates(self) -> list[dict]:
+        if deleted:
+            if progress_callback:
+                progress_callback(55, "Regenerating iPod database...")
+            self.sync_itunescdb()
+            if progress_callback:
+                progress_callback(100, f"Removed {deleted} track(s)")
+
+        return deleted
+
+    def remove_duplicates(self, progress_callback=None) -> list[dict]:
         """Find and remove duplicate tracks (same title+artist+album)."""
         all_tracks = self._scan_ipod_files()
         seen: dict[tuple, list[dict]] = {}
@@ -467,7 +489,6 @@ class Nano7Database:
         for key, items in seen.items():
             if len(items) <= 1:
                 continue
-            # Keep first, delete rest
             for item in items[1:]:
                 fpath = item["file_path"]
                 if os.path.exists(fpath):
@@ -480,9 +501,19 @@ class Nano7Database:
                         "file_path": fpath,
                     })
                     logger.info("Removed duplicate: %s", fpath)
+            if progress_callback:
+                progress_callback(
+                    min(50, int(len(removed) / max(len(all_tracks), 1) * 50)),
+                    f"Removing duplicates... {len(removed)} found",
+                )
 
         if removed:
+            if progress_callback:
+                progress_callback(55, "Regenerating iPod database...")
             self.sync_itunescdb()
+            if progress_callback:
+                progress_callback(100, f"Removed {len(removed)} duplicate(s)")
+
         logger.info("Removed %d duplicate(s)", len(removed))
         return removed
 

src/main.py

@@ -55,6 +55,8 @@ class WorkerThread(QThread):
                 "transfer": self._run_transfer,
                 "detect_devices": self._run_detect_devices,
                 "export_ipod": self._run_export_ipod,
+                "delete_tracks": self._run_delete_tracks,
+                "remove_duplicates": self._run_remove_duplicates,
             }
             handler = handlers.get(self.task_type)
             if handler:
@@ -92,7 +94,7 @@ class WorkerThread(QThread):
         tracks = self.kwargs.get("tracks", [])
         local_files = self.kwargs.get("local_files", [])
         output_dir = self.kwargs.get("output_dir", "converted")
-        fmt = self.kwargs.get("format", "m4a")
+        fmt = self.kwargs.get("format", "mp3")
         quality = self.kwargs.get("quality", 256)
 
         valid_tracks = [
@@ -223,6 +225,40 @@ class WorkerThread(QThread):
         exported = ipod.export_tracks(tracks, dest_dir, progress_callback=progress)
         self.finished_signal.emit(True, f"Exported {len(exported)} track(s)", exported)
 
+    def _run_delete_tracks(self):
+        pids = self.kwargs.get("pids", [])
+        mount_point = self.kwargs.get("mount_point")
+
+        if not pids or not mount_point:
+            self.finished_signal.emit(False, "No tracks to delete or device not mounted", None)
+            return
+
+        from ipod_nano7_db import Nano7Database
+        db = Nano7Database(mount_point)
+
+        def progress(p, s):
+            self.progress_signal.emit(p, s)
+
+        removed = db.delete_tracks(pids, progress_callback=progress)
+        self.finished_signal.emit(True, f"Removed {removed} track(s)", removed)
+
+    def _run_remove_duplicates(self):
+        mount_point = self.kwargs.get("mount_point")
+
+        if not mount_point:
+            self.finished_signal.emit(False, "No iPod device mounted", None)
+            return
+
+        from ipod_nano7_db import Nano7Database
+        db = Nano7Database(mount_point)
+
+        def progress(p, s):
+            self.progress_signal.emit(p, s)
+
+        self.progress_signal.emit(0, "Scanning for duplicates...")
+        removed = db.remove_duplicates(progress_callback=progress)
+        self.finished_signal.emit(True, f"Removed {len(removed)} duplicate(s)", removed)
+
     def stop(self):
         self.is_running = False
         self.wait()
@@ -311,7 +347,7 @@ class MainWindow(QMainWindow):
         format_layout = QHBoxLayout()
         format_label = QLabel("Format:")
         self.format_combo = QComboBox()
-        self.format_combo.addItems(["m4a", "mp3"])
+        self.format_combo.addItems(["mp3", "m4a"])
         quality_label = QLabel("Quality (kbps):")
         self.quality_spin = QSpinBox()
         self.quality_spin.setRange(128, 320)
@@ -555,6 +591,15 @@ class MainWindow(QMainWindow):
         self.export_status.setVisible(False)
         layout.addWidget(self.export_status)
 
+        self.delete_progress = QProgressBar()
+        self.delete_progress.setRange(0, 100)
+        self.delete_progress.setVisible(False)
+        layout.addWidget(self.delete_progress)
+
+        self.delete_status = QLabel("")
+        self.delete_status.setVisible(False)
+        layout.addWidget(self.delete_status)
+
     def _setup_settings_tab(self, tab):
         layout = QVBoxLayout(tab)
 
@@ -1256,6 +1301,22 @@ class MainWindow(QMainWindow):
         if success:
             self.library_status.setText(message)
             self._scan_library()
+            if result:
+                converted_source_paths = set()
+                for track, _output_path in result:
+                    src = getattr(track, "download_path", None)
+                    if src:
+                        converted_source_paths.add(os.path.normpath(src))
+                if converted_source_paths:
+                    self.library_scanned_sources = [
+                        s for s in self.library_scanned_sources
+                        if os.path.normpath(s.get("path", "")) not in converted_source_paths
+                    ]
+                    self.library_source_files = [
+                        p for p in self.library_source_files
+                        if os.path.normpath(p) not in converted_source_paths
+                    ]
+                    self._refresh_library_ui()
         else:
             self.library_status.setText(f"Error: {message}")
             QMessageBox.warning(self, "Conversion Error", message)
@@ -1508,23 +1569,52 @@ class MainWindow(QMainWindow):
         if reply != QMessageBox.StandardButton.Yes:
             return
 
-        try:
+        if self.worker_thread and self.worker_thread.isRunning():
-            from ipod_nano7_db import Nano7Database
+            QMessageBox.information(self, "Info", "Please wait for the current task to finish")
-            db = Nano7Database(self.current_mount_point)
+            return
 
-            removed = 0
+        pids = []
         for item in selected:
             track_data = item.data(Qt.ItemDataRole.UserRole)
             if track_data and "pid" in track_data:
-                    success = db.delete_track(track_data["pid"])
+                pids.append(track_data["pid"])
-                    if success:
-                        removed += 1
 
+        if not pids:
+            QMessageBox.warning(self, "Error", "No valid tracks selected")
+            return
+
+        self._set_delete_buttons_enabled(False)
+        self.delete_progress.setVisible(True)
+        self.delete_progress.setValue(0)
+        self.delete_status.setVisible(True)
+        self.delete_status.setText(f"Removing {len(pids)} track(s)...")
+
+        self.worker_thread = WorkerThread(
+            task_type="delete_tracks",
+            pids=pids,
+            mount_point=self.current_mount_point,
+        )
+        self.worker_thread.progress_signal.connect(self._on_delete_progress)
+        self.worker_thread.finished_signal.connect(self._on_delete_finished)
+        self.worker_thread.start()
+
+    def _set_delete_buttons_enabled(self, enabled: bool):
+        for w in self.findChildren(QPushButton):
+            if w.text() in ("Remove Selected from iPod", "Remove Duplicate Tracks",
+                            "Scan for Orphaned Files", "\u2B07 Download to Computer..."):
+                w.setEnabled(enabled)
+
+    def _on_delete_progress(self, progress, status):
+        self.delete_progress.setValue(progress)
+        self.delete_status.setText(status)
+
+    def _on_delete_finished(self, success, message, result):
+        self._set_delete_buttons_enabled(True)
+        if success:
+            self.delete_progress.setValue(100)
         self._load_ipod_tracks()
-            QMessageBox.information(self, "Done", f"Successfully removed {removed} track(s) from iPod")
+        QMessageBox.information(self, "Done" if success else "Error", message)
-        except Exception as e:
+        self._cleanup_worker()
-            logger.error(f"Failed to remove tracks: {e}")
-            QMessageBox.warning(self, "Error", f"Failed to remove tracks: {e}")
 
     def _on_export_ipod_clicked(self):
         if not self.current_mount_point:
@@ -1629,26 +1719,31 @@ class MainWindow(QMainWindow):
             QMessageBox.warning(self, "Error", "No iPod device mounted.")
             return
 
-        try:
+        if self.worker_thread and self.worker_thread.isRunning():
-            from ipod_nano7_db import Nano7Database
+            QMessageBox.information(self, "Info", "Please wait for the current task to finish")
-            db = Nano7Database(self.current_mount_point)
-            removed = db.remove_duplicates()
-
-            if not removed:
-                QMessageBox.information(self, "Scan Complete", "No duplicate tracks found.")
             return
 
-            details = f"Found and removed {len(removed)} duplicate entry(ies):\n\n"
+        self._set_delete_buttons_enabled(False)
-            for r in removed[:15]:
+        self.delete_progress.setVisible(True)
-                details += f"  {r['artist']} \u2014 {r['title']}  ({r['album']})\n"
+        self.delete_progress.setValue(0)
-            if len(removed) > 15:
+        self.delete_status.setVisible(True)
-                details += f"  ... and {len(removed) - 15} more\n"
+        self.delete_status.setText("Scanning for duplicates...")
 
-            QMessageBox.information(self, "Duplicates Removed", details)
+        self.worker_thread = WorkerThread(
+            task_type="remove_duplicates",
+            mount_point=self.current_mount_point,
+        )
+        self.worker_thread.progress_signal.connect(self._on_delete_progress)
+        self.worker_thread.finished_signal.connect(self._on_delete_duplicates_finished)
+        self.worker_thread.start()
+
+    def _on_delete_duplicates_finished(self, success, message, result):
+        self._set_delete_buttons_enabled(True)
         self._load_ipod_tracks()
-        except Exception as e:
+        if success:
-            logger.error(f"Failed to remove duplicates: {e}")
+            self.delete_progress.setValue(100)
-            QMessageBox.warning(self, "Error", f"Failed to remove duplicates: {e}")
+        QMessageBox.information(self, "Duplicates" if success else "Error", message)
+        self._cleanup_worker()
 
     def closeEvent(self, event):
         if self.worker_thread and self.worker_thread.isRunning():