async fn get_message_handler(
    Path((assistant_id, message_id)): Path<(i32, i32)>,
    State(app_state): State<AppState>,
) -> Result<JsonResponse<Message>, (StatusCode, String)> {
    // TODO: Implement the logic to fetch a specific message from the database
    Err((StatusCode::NOT_IMPLEMENTED, "This endpoint is not implemented yet.".to_string()))
}

// Update a specific message
async fn update_message_handler(
    Path((assistant_id, message_id)): Path<(i32, i32)>,
    State(app_state): State<AppState>,
    Json(message): Json<CreateMessage>,
) -> Result<JsonResponse<Message>, (StatusCode, String)> {
    // TODO: Implement the logic to update a specific message in the database
    Err((StatusCode::NOT_IMPLEMENTED, "This endpoint is not implemented yet.".to_string()))
}

// Delete a specific message
async fn delete_message_handler(
    Path((assistant_id, message_id)): Path<(i32, i32)>,
    State(app_state): State<AppState>,
) -> Result<JsonResponse<Message>, (StatusCode, String)> {
    // TODO: Implement the logic to delete a specific message from the database
    Err((StatusCode::NOT_IMPLEMENTED, "This endpoint is not implemented yet.".to_string()))
}

// List all messages from an assistant
async fn list_all_messages_handler(
    Path((assistant_id,)): Path<(i32,)>,
    State(app_state): State<AppState>,
) -> Result<JsonResponse<Vec<Message>>, (StatusCode, String)> {
    // TODO: Implement the logic to fetch all messages from a specific assistant
    Err((StatusCode::NOT_IMPLEMENTED, "This endpoint is not implemented yet.".to_string()))
}

// Router::new()
//     // ... existing routes ...
//     .route("/v1/assistants/:assistant_id/messages/:message_id", get(get_message_handler))
//     .route("/v1/assistants/:assistant_id/messages/:message_id", patch(update_message_handler))
//     .route("/v1/assistants/:assistant_id/messages/:message_id", delete(delete_message_handler))
//     .route("/v1/assistants/:assistant_id/messages", get(list_all_messages_handler))
//     // ... existing layers and state ...