Frontend and backend work together fine, complete workflow is implemented

web/backend/services/progress_publisher.py

@@ -1,15 +1,20 @@
 """WebSocket progress publisher – decouples task manager from WebSocket."""
 
-import json
+import asyncio
 from typing import Dict, Set
 
 from fastapi import WebSocket
 
-# Active WebSocket connections
+# This will be set by main.py when the app starts
+MAIN_LOOP = None
+
 active_connections: Dict[str, Set[WebSocket]] = {}
 
 
 def publish_progress(task_id: str, progress: int, message: str, status: str = "processing"):
+    """
+    Publish progress update to all connected WebSocket clients for a task.
+    """
     if task_id not in active_connections:
         return
 
@@ -26,10 +31,14 @@ def publish_progress(task_id: str, progress: int, message: str, status: str = "p
     to_remove = set()
     for websocket in active_connections.get(task_id, set()):
         try:
-            websocket.send_json(data)
+            # Use the stored main loop, or fallback to getting the current loop
+            loop = MAIN_LOOP or asyncio.get_running_loop()
+            asyncio.run_coroutine_threadsafe(websocket.send_json(data), loop)
         except Exception:
+            # Client disconnected or other error
             to_remove.add(websocket)
 
+    # Clean up disconnected clients
     for websocket in to_remove:
         active_connections[task_id].discard(websocket)
     if task_id in active_connections and not active_connections[task_id]:
@@ -37,13 +46,15 @@ def publish_progress(task_id: str, progress: int, message: str, status: str = "p
 
 
 def register_connection(task_id: str, websocket: WebSocket):
+    """Register a WebSocket connection for a task."""
     if task_id not in active_connections:
         active_connections[task_id] = set()
     active_connections[task_id].add(websocket)
 
 
 def unregister_connection(task_id: str, websocket: WebSocket):
+    """Unregister a WebSocket connection for a task."""
     if task_id in active_connections:
         active_connections[task_id].discard(websocket)
         if not active_connections[task_id]:
-            del active_connections[task_id]
+            del active_connections[task_id]

web/backend/services/splitter.py

@@ -5,6 +5,7 @@ import sys
 import shutil
 from pathlib import Path
 from typing import List, Dict, Any
+import time
 
 from backend.config import settings
 from backend.services.task_manager import task_manager
@@ -65,27 +66,17 @@ def run_split_task(task_id: str, tracklist: List[TracklistEntry], options: Dict[
 
         from audio_splitter.core import split_audio
 
-        # We need to track progress from the core.
-        # Since the core doesn't have a progress callback, we'll update progress
-        # based on track list size (approximate).
-        total_tracks = len(tracks)
-        progress_base = 10  # Starting progress after init
-
         task_manager.update_task_with_progress(
-            task_id, progress=progress_base, message="Starting split..."
+            task_id, progress=10, message="Starting split..."
         )
 
         # Run the split
-        # The core prints progress to stdout, but we can't easily capture it.
-        # We'll update progress based on track count.
-        # For now, we'll report progress after the split completes.
-        # A more advanced implementation would capture stdout or add a callback.
-
         split_audio(str(input_path), str(output_dir), tracks, args)
 
-        # After split completes, get the output files
+        # Get output files
         output_files = FileManager.get_output_files(task_id)
 
+        # Final status update
         task_manager.update_task_with_progress(
             task_id,
             progress=100,
@@ -99,6 +90,9 @@ def run_split_task(task_id: str, tracklist: List[TracklistEntry], options: Dict[
             tracks=output_files
         )
 
+        # Give WebSocket time to send the final message
+        time.sleep(0.5)
+
     except Exception as e:
         task_manager.update_task_with_progress(
             task_id,
@@ -106,4 +100,4 @@ def run_split_task(task_id: str, tracklist: List[TracklistEntry], options: Dict[
             message="Split failed",
             status=TaskStatus.ERROR,
             error=str(e)
-        )
+        )