From 3ccb7bf1cdfc3e0f744f73dd4a9ee8fccbcbb678 Mon Sep 17 00:00:00 2001
From: Olaf Wintermann <olaf.wintermann@gmail.com>
Date: Sat, 1 Aug 2026 11:39:03 +0200
Subject: [PATCH] add backend function for checking if a nodename is available

---
 application/backend/src/backend.rs | 11 +++++++++++
 application/backend/src/storage.rs | 23 +++++++++++++++++++++++
 application/note/src/file.rs       |  2 +-
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/application/backend/src/backend.rs b/application/backend/src/backend.rs
index 2e46450..f1344ea 100644
--- a/application/backend/src/backend.rs
+++ b/application/backend/src/backend.rs
@@ -717,6 +717,17 @@ impl BackendHandle {
         let _ = self.tx.send(cmd);
     }
 
+    pub fn check_nodename<F>(&self, collection_id: i32, note_id: i32, nodename: &str, callback: F)
+    where F: FnOnce(Result<bool, DbErr>) + Send + 'static {
+        let bhandle = self.clone();
+        let name = nodename.to_string();
+        let cmd = Box::pin(async move {
+            let result = check_free_nodename(&bhandle.backend.db, collection_id, note_id, name.as_str()).await;
+            callback(result);
+        });
+        let _ = self.tx.send(cmd);
+    }
+
     pub fn get_file_metadata<F>(&self, path: &Path, callback: F)
     where F: FnOnce(std::io::Result<Metadata>) + Send + 'static {
         let p = PathBuf::from(path);
diff --git a/application/backend/src/storage.rs b/application/backend/src/storage.rs
index a91ab75..7ce260a 100644
--- a/application/backend/src/storage.rs
+++ b/application/backend/src/storage.rs
@@ -136,3 +136,26 @@ pub async fn write_tmp_file(name: &str, data: Vec<u8>) -> std::io::Result<std::p
 
     Ok(path)
 }
+
+pub async fn check_free_nodename(db: &DatabaseConnection, collection_id: i32, note_id: i32, nodename: &str) -> Result<bool, DbErr> {
+    let exists = note::Entity::find()
+            .filter(note::Column::CollectionId.eq(collection_id))
+            .filter(note::Column::Nodename.eq(nodename))
+            .select_only()
+            .column(note::Column::NoteId)
+            .into_tuple::<i32>()
+            .one(db).await?;
+    if exists.is_some() {
+        return Ok(false)
+    }
+
+    let path = get_note_storage_path(db, note_id).await?;
+    if let Some(path) = path {
+        let m = fs::metadata(Path::new(&path)).await;
+        if m.is_ok() {
+            return Ok(false) // file exists
+        }
+    }
+
+    Ok(true)
+}
\ No newline at end of file
diff --git a/application/note/src/file.rs b/application/note/src/file.rs
index bf357bb..559efce 100644
--- a/application/note/src/file.rs
+++ b/application/note/src/file.rs
@@ -133,7 +133,7 @@ impl FileNote {
                                     let url = Url::from_file_path(&path);
                                     if let Ok(url) = url {
                                         note.webview.load_url(url.as_str());
-                                        // TODO: replace 1 with enum value
+                                        // TODO: replace 2 with enum value
                                         note.preview_tab.set(2);
                                     }
                                 }
-- 
2.52.0