Submit browse jobs

src/tui/app/machine/fetch_state.rs

@@ -27,6 +27,11 @@ pub struct FetchState {
     fetch_rx: Option<MbApiReceiver>,
 }
 
+struct SubmitJob {
+    fetch: FetchState,
+    requests: VecDeque<MbParams>,
+}
+
 macro_rules! try_recv_mb_api_receiver {
     ($rx:expr) => {
         if let Some(rx) = &($rx) {
@@ -78,24 +83,62 @@ impl AppMachine<FetchState> {
     }
 
     fn app_fetch_new(inner: AppInner) -> App {
-        let requests = match Self::search_job(&inner) {
-            Ok(requests) => requests,
+        let (tx, rx) = mpsc::channel::<MbApiResult>();
+        let job = match Self::fetch_job(&inner, rx) {
+            Ok(job) => job,
             Err(err) => return AppMachine::error_state(inner, err.to_string()).into(),
         };
 
-        if requests.is_empty() {
+        if job.requests.is_empty() {
             return AppMachine::browse_state(inner).into();
         }
 
-        let (search_tx, search_rx) = mpsc::channel::<MbApiResult>();
-        let fetch = FetchState::search(search_rx);
-
-        match inner.musicbrainz.submit_background_job(search_tx, requests) {
-            Ok(()) => AppMachine::fetch_state(inner, fetch).into(),
+        match inner.musicbrainz.submit_background_job(tx, job.requests) {
+            Ok(()) => AppMachine::fetch_state(inner, job.fetch).into(),
             Err(err) => AppMachine::error_state(inner, err.to_string()).into(),
         }
     }
 
+    fn fetch_job(inner: &AppInner, rx: MbApiReceiver) -> Result<SubmitJob, &'static str> {
+        let coll = inner.music_hoard.get_collection();
+
+        let artist = match inner.selection.state_artist(coll) {
+            Some(artist_state) => &coll[artist_state.index],
+            None => return Err("cannot fetch: no artist selected"),
+        };
+
+        let requests = match inner.selection.category() {
+            Category::Artist => {
+                let fetch: FetchState;
+                let mut requests = Self::search_artist_job(artist);
+                if requests.is_empty() {
+                    fetch = FetchState::fetch(rx);
+                    requests = Self::browse_release_group_job(&artist.meta.info.musicbrainz);
+                } else {
+                    fetch = FetchState::search(rx);
+                }
+                SubmitJob { fetch, requests }
+            }
+            _ => {
+                let arid = match artist.meta.info.musicbrainz {
+                    MbRefOption::Some(ref mbref) => mbref,
+                    _ => return Err("cannot fetch album: artist has no MBID"),
+                };
+                let album = match inner.selection.state_album(coll) {
+                    Some(album_state) => &artist.albums[album_state.index],
+                    None => return Err("cannot fetch album: no album selected"),
+                };
+                let artist_id = &artist.meta.id;
+                SubmitJob {
+                    fetch: FetchState::search(rx),
+                    requests: Self::search_release_group_job(artist_id, arid, album),
+                }
+            }
+        };
+
+        Ok(requests)
+    }
+
     pub fn app_fetch_next(inner: AppInner, mut fetch: FetchState) -> App {
         match fetch.try_recv() {
             Ok(fetch_result) => match fetch_result {
@@ -167,33 +210,6 @@ impl AppMachine<FetchState> {
         Self::app_fetch_next(inner, fetch)
     }
 
-    fn search_job(inner: &AppInner) -> Result<VecDeque<MbParams>, &'static str> {
-        let coll = inner.music_hoard.get_collection();
-
-        let artist = match inner.selection.state_artist(coll) {
-            Some(artist_state) => &coll[artist_state.index],
-            None => return Err("cannot fetch: no artist selected"),
-        };
-
-        let requests = match inner.selection.category() {
-            Category::Artist => Self::search_artist_job(artist),
-            _ => {
-                let arid = match artist.meta.info.musicbrainz {
-                    MbRefOption::Some(ref mbref) => mbref,
-                    _ => return Err("cannot fetch album: artist has no MBID"),
-                };
-                let album = match inner.selection.state_album(coll) {
-                    Some(album_state) => &artist.albums[album_state.index],
-                    None => return Err("cannot fetch album: no album selected"),
-                };
-                let artist_id = &artist.meta.id;
-                Self::search_release_group_job(artist_id, arid, album)
-            }
-        };
-
-        Ok(requests)
-    }
-
     fn search_artist_job(artist: &Artist) -> VecDeque<MbParams> {
         match artist.meta.info.musicbrainz {
             MbRefOption::Some(ref arid) => {
@@ -231,6 +247,17 @@ impl AppMachine<FetchState> {
             .collect()
     }
 
+    fn browse_release_group_job(mbopt: &MbRefOption<MbArtistRef>) -> VecDeque<MbParams> {
+        match mbopt {
+            MbRefOption::Some(mbref) => Self::browse_release_group_request(mbref),
+            _ => VecDeque::new(),
+        }
+    }
+
+    fn browse_release_group_request(mbref: &MbArtistRef) -> VecDeque<MbParams> {
+        VecDeque::from([MbParams::browse_release_group(mbref.mbid().clone())])
+    }
+
     fn submit_lookup_artist_job(
         musicbrainz: &dyn IMbJobSender,
         result_sender: ResultSender,