Start to implement the VideoService list_root_folder method.

backend/application/src/video/service.rs

@@ -4,6 +4,37 @@ use std::fs::File;
 use std::io::{BufRead, BufReader};
 use std::path::Path;
 use std::io::Read;
+use lumiere_domain::video::error::VideoError;
+use lumiere_domain::video::model::library_item::LibraryItem;
+use lumiere_domain::video::port::VideoPort;
+
+#[derive(Clone)]
+pub struct VideoService {
+    video_port: Box<dyn VideoPort>
+}
+
+impl VideoService {
+    pub fn new(video_port: Box<dyn VideoPort>) -> Self {
+        Self { video_port }
+    }
+
+    pub fn list_root_folder(self) -> Result<Vec<LibraryItem>, VideoError> {
+        let library_items = self.video_port.list_root_folder()?;
+
+        let items_without_id = library_items.iter().filter(|item| item.id == None);
+        // generate a new Uuid for each item without id
+        // assign this new Uuid to the item
+        // save the item by using the method video_port.save
+        // replace the items_without_id by modified items_without_id
+
+        Ok(vec!())
+    }
+}
+
+
+
+
+
 
 /// Basic example: Read file line by line using BufReader
 pub fn read_file_line_by_line(path: &str) -> std::io::Result<()> {