first commit

src/app/components/library/library_model.rs

@@ -0,0 +1,70 @@
+use std::cell::Ref;
+use std::ops::Deref;
+use std::rc::Rc;
+
+use crate::app::models::*;
+use crate::app::state::HomeState;
+use crate::app::{ActionDispatcher, AppAction, AppModel, BrowserAction, ListStore};
+
+pub struct LibraryModel {
+    app_model: Rc<AppModel>,
+    dispatcher: Box<dyn ActionDispatcher>,
+}
+
+impl LibraryModel {
+    pub fn new(app_model: Rc<AppModel>, dispatcher: Box<dyn ActionDispatcher>) -> Self {
+        Self {
+            app_model,
+            dispatcher,
+        }
+    }
+
+    fn state(&self) -> Option<Ref<'_, HomeState>> {
+        self.app_model.map_state_opt(|s| s.browser.home_state())
+    }
+
+    pub fn get_list_store(&self) -> Option<impl Deref<Target = ListStore<AlbumModel>> + '_> {
+        Some(Ref::map(self.state()?, |s| &s.albums))
+    }
+
+    pub fn refresh_saved_albums(&self) -> Option<()> {
+        let api = self.app_model.get_spotify();
+        let batch_size = self.state()?.next_albums_page.batch_size;
+
+        self.dispatcher
+            .call_spotify_and_dispatch(move || async move {
+                api.get_saved_albums(0, batch_size)
+                    .await
+                    .map(|albums| BrowserAction::SetLibraryContent(albums).into())
+            });
+
+        Some(())
+    }
+
+    pub fn has_albums(&self) -> bool {
+        self.get_list_store()
+            .map(|list| list.len() > 0)
+            .unwrap_or(false)
+    }
+
+    pub fn load_more_albums(&self) -> Option<()> {
+        let api = self.app_model.get_spotify();
+
+        let next_page = &self.state()?.next_albums_page;
+        let batch_size = next_page.batch_size;
+        let offset = next_page.next_offset?;
+
+        self.dispatcher
+            .call_spotify_and_dispatch(move || async move {
+                api.get_saved_albums(offset, batch_size)
+                    .await
+                    .map(|albums| BrowserAction::AppendLibraryContent(albums).into())
+            });
+
+        Some(())
+    }
+
+    pub fn open_album(&self, album_id: String) {
+        self.dispatcher.dispatch(AppAction::ViewAlbum(album_id));
+    }
+}