def create_session():
    session_name = request.form.get('session-name', '').strip()
    model = request.form.get('model-select', '')
    initial_prompt = request.form.get('initial-prompt', '')
    
    if not session_name:
        return {"error": "Session name is required"}
    
    session_id = generate_session_id()
    session_data = {
        'id': session_id,
        'name': session_name,
        'model': model,
        'initial_prompt': initial_prompt,
        'created_at': get_current_timestamp(),
        'last_active': get_current_timestamp()
    }
    
    save_session(session_data)
    return {"redirect": f"session_{session_id}.ui"}

def filter_sessions():
    search_term = request.form.get('session-search', '').lower()
    all_sessions = get_all_sessions()
    
    if search_term:
        filtered_sessions = [
            session for session in all_sessions 
            if search_term in session['name'].lower() or 
               search_term in session['model'].lower()
        ]
    else:
        filtered_sessions = all_sessions
    
    return {"sessions": filtered_sessions}

def open_session():
    session_id = request.form.get('session_id')
    if session_id:
        session_data = get_session_by_id(session_id)
        if session_data:
            return {"redirect": f"session_{session_id}.ui"}
    
    return {"error": "Session not found"}

def filter_services():
    search_term = request.form.get('service-search', '').lower()
    all_services = get_all_services()
    
    if search_term:
        filtered_services = [
            service for service in all_services 
            if search_term in service['name'].lower() or 
               search_term in service['endpoint'].lower()
        ]
    else:
        filtered_services = all_services
    
    return {"services": filtered_services}

def add_service():
    return {"redirect": "add_service.ui"}

def edit_service():
    service_id = request.form.get('service_id')
    if service_id:
        service_data = get_service_by_id(service_id)
        if service_data:
            return {"redirect": f"edit_service_{service_id}.ui"}
    
    return {"error": "Service not found"}

def remove_service():
    service_id = request.form.get('service_id')
    if service_id:
        delete_service(service_id)
        return {"success": True, "message": "Service removed successfully"}
    
    return {"error": "Service not found"}

def test_service_connection():
    service_id = request.form.get('service_id')
    if service_id:
        service_data = get_service_by_id(service_id)
        if service_data:
            is_connected = test_connection(service_data['endpoint'])
            return {"status": "Connected" if is_connected else "Disconnected"}
    
    return {"error": "Service not found"}

def save_general_settings():
    default_model = request.form.get('default-model', '')
    session_timeout = request.form.get('session-timeout', '30')
    auto_save = request.form.get('auto-save', 'false') == 'true'
    
    settings = {
        'default_model': default_model,
        'session_timeout': int(session_timeout),
        'auto_save': auto_save
    }
    
    save_settings('general', settings)
    return {"success": True, "message": "General settings saved successfully"}

def save_security_settings():
    require_auth = request.form.get('require-auth', 'false') == 'true'
    encrypt_storage = request.form.get('encrypt-storage', 'false') == 'true'
    
    settings = {
        'require_auth': require_auth,
        'encrypt_storage': encrypt_storage
    }
    
    save_settings('security', settings)
    return {"success": True, "message": "Security settings saved successfully"}

def save_appearance_settings():
    theme = request.form.get('theme-select', 'dark')
    
    settings = {
        'theme': theme
    }
    
    save_settings('appearance', settings)
    return {"success": True, "message": "Appearance settings saved successfully"}

def add_model():
    return {"redirect": "add_model.ui"}

def update_model():
    model_id = request.form.get('model_id')
    model_name = request.form.get('model_name')
    model_provider = request.form.get('model_provider')
    
    if not model_id or not model_name:
        return {"error": "Model ID and name are required"}
    
    model_data = {
        'id': model_id,
        'name': model_name,
        'provider': model_provider
    }
    
    update_model_in_storage(model_data)
    return {"success": True, "message": "Model updated successfully"}

def remove_model():
    model_id = request.form.get('model_id')
    if model_id:
        delete_model_from_storage(model_id)
        return {"success": True, "message": "Model removed successfully"}
    
    return {"error": "Model not found"}

def update_model_in_storage(model_data):
    # Framework-provided function
    pass

def delete_model_from_storage(model_id):
    # Framework-provided function
    pass

# Helper function stubs - these would be provided by the framework
def generate_session_id():
    # Framework-provided function
    pass

def get_current_timestamp():
    # Framework-provided function  
    pass

def save_session(session_data):
    # Framework-provided function
    pass

def get_all_sessions():
    # Framework-provided function
    return []

def get_session_by_id(session_id):
    # Framework-provided function
    return None

def get_all_services():
    # Framework-provided function
    return []

def get_service_by_id(service_id):
    # Framework-provided function
    return None

def delete_service(service_id):
    # Framework-provided function
    pass

def test_connection(endpoint):
    # Framework-provided function
    return True

def save_settings(category, settings):
    # Framework-provided function
    pass