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utils.py

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+import uuid
+from datetime import datetime, date
+
+def create_todo(text, priority="Medium", due_date=None):
+    """Create a new todo item"""
+    if due_date is None:
+        due_date = date.today().strftime('%Y-%m-%d')
+    
+    return {
+        'id': str(uuid.uuid4()),
+        'text': text,
+        'completed': False,
+        'priority': priority,
+        'due_date': due_date,
+        'created_at': datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+    }
+
+def toggle_todo(todos, todo_id):
+    """Toggle the completion status of a todo"""
+    for todo in todos:
+        if todo['id'] == todo_id:
+            todo['completed'] = not todo['completed']
+            break
+    return todos
+
+def delete_todo(todos, todo_id):
+    """Delete a todo item"""
+    return [todo for todo in todos if todo['id'] != todo_id]
+
+def update_todo(todos, todo_id, new_text, new_priority, new_due_date):
+    """Update an existing todo"""
+    for todo in todos:
+        if todo['id'] == todo_id:
+            todo['text'] = new_text
+            todo['priority'] = new_priority
+            todo['due_date'] = new_due_date
+            break
+    return todos
+
+def clear_completed_todos(todos):
+    """Remove all completed todos"""
+    return [todo for todo in todos if not todo['completed']]
+
+def filter_todos(todos, filter_type='all', search_query='', priorities=None):
+    """Filter todos based on completion status and search query"""
+    if priorities is None:
+        priorities = ['High', 'Medium', 'Low']
+    
+    filtered = todos
+    
+    # Filter by completion status
+    if filter_type == 'active':
+        filtered = [todo for todo in filtered if not todo['completed']]
+    elif filter_type == 'completed':
+        filtered = [todo for todo in filtered if todo['completed']]
+    
+    # Filter by priority
+    filtered = [todo for todo in filtered if todo['priority'] in priorities]
+    
+    # Filter by search query
+    if search_query:
+        search_query = search_query.lower()
+        filtered = [todo for todo in filtered if search_query in todo['text'].lower()]
+    
+    # Sort by priority and due date
+    priority_order = {'High': 0, 'Medium': 1, 'Low': 2}
+    filtered.sort(key=lambda x: (x['completed'], priority_order[x['priority']], x['due_date']))
+    
+    return filtered
+
+def get_todo_stats(todos):
+    """Get statistics about todos"""
+    total = len(todos)
+    completed = len([todo for todo in todos if todo['completed']])
+    pending = total - completed
+    
+    return {
+        'total': total,
+        'completed': completed,
+        'pending': pending
+    }
+
+def get_priority_stats(todos):
+    """Get statistics by priority"""
+    stats = {'High': 0, 'Medium': 0, 'Low': 0}
+    for todo in todos:
+        if not todo['completed']:
+            stats[todo['priority']] += 1
+    return stats
+
+def export_todos(todos):
+    """Export todos to JSON format"""
+    return json.dumps(todos, indent=2)
+
+def import_todos(json_data):
+    """Import todos from JSON data"""
+    try:
+        return json.loads(json_data)
+    except json.JSONDecodeError:
+        return None