better mobile desktop sync

app.py

@@ -22,19 +22,8 @@ def get_user_id():
 def is_logged_in():
     return 'user_id' in session
 
-# --- Routes ---
-
-@app.route('/')
-def index():
-    # If not logged in, show the landing page instead of redirecting
-    if not is_logged_in():
-        return render_template('landing.html')
-    
-    user_id = get_user_id()
-    
-    # Get all activities
-    activities = list(db.activities.find({'user_id': user_id}))
-    
+# --- Logic Helpers ---
+def get_dashboard_context(user_id):
     # Check for active time entry
     current_entry = db.time_entries.find_one({
         'user_id': user_id,
@@ -49,15 +38,14 @@ def index():
             current_entry['activity_name'] = active_activity['name']
             current_entry['activity_color'] = active_activity.get('color', '#3498db')
         
-        # Logic for fetching tasks:
-        # 1. Fetch Session Specific Tasks (linked via time_entry_id)
+        # 1. Session Tasks
         session_tasks = list(db.tasks.find({
             'user_id': user_id,
             'status': 'open',
             'time_entry_id': current_entry['_id']
         }))
         
-        # 2. Fetch Contextual Tasks (linked via activity_id, no time_entry_id)
+        # 2. Context Tasks
         context_criteria = {
             'user_id': user_id,
             'status': 'open',
@@ -67,27 +55,56 @@ def index():
         }
         
         current_subcat = current_entry.get('subcategory')
-        
         if current_subcat:
-            # If active entry has subcategory: Show tasks matching that subcategory OR general tasks (no subcategory)
-            context_criteria['$or'] = [
-                {'subcategory': current_subcat},
-                {'subcategory': {'$in': [None, '']}}
-            ]
+            context_criteria['$or'] = [{'subcategory': current_subcat}, {'subcategory': {'$in': [None, '']}}]
         else:
-            # If active entry has NO subcategory: Show only General tasks (no subcategory assigned)
-            # This hides specific subcategory tasks when just tracking the general activity
             context_criteria['subcategory'] = {'$in': [None, '']}
             
         context_tasks = list(db.tasks.find(context_criteria))
-        
         active_tasks = session_tasks + context_tasks
+        
+    return current_entry, active_tasks
+
+# --- Routes ---
+
+@app.route('/')
+def index():
+    # If not logged in, show the landing page instead of redirecting
+    if not is_logged_in():
+        return render_template('landing.html')
+    
+    user_id = get_user_id()
+    
+    # Get all activities
+    activities = list(db.activities.find({'user_id': user_id}))
+    
+    # Use shared logic
+    current_entry, active_tasks = get_dashboard_context(user_id)
 
     return render_template('dashboard.html', 
                            activities=activities, 
                            current_entry=current_entry,
                            tasks=active_tasks)
 
+@app.route('/api/sync_check')
+def sync_check():
+    if not is_logged_in(): return jsonify({'error': 'auth'}), 401
+    user_id = get_user_id()
+    
+    current_entry, active_tasks = get_dashboard_context(user_id)
+    
+    entry_id = str(current_entry['_id']) if current_entry else 'none'
+    
+    # Create simple hash of tasks (IDs joined string)
+    # If a task is completed, it drops from this list -> hash changes -> client reloads
+    task_ids = sorted([str(t['_id']) for t in active_tasks])
+    tasks_hash = ','.join(task_ids)
+    
+    return jsonify({
+        'entry_hash': entry_id,
+        'tasks_hash': tasks_hash
+    })
+
 @app.route('/register', methods=['GET', 'POST'])
 def register():
     if request.method == 'POST':
@@ -228,6 +245,7 @@ def start_timer_bg(activity_id):
     
     return jsonify({
         'status': 'success', 
+        'entry_id': str(new_entry_id),
         'start_time': start_time.isoformat(),
         'activity_name': activity['name'],
         'activity_color': activity.get('color', '#3498db')