feat(models): Created the StatefulTree struct for displaying seasons and episodes (and any other structured data) for the UI.

src/models/stateful_tree.rs

@@ -0,0 +1,62 @@
+use managarr_tree_widget::{TreeItem, TreeState};
+use ratatui::text::ToText;
+
+use super::Scrollable;
+use core::hash::Hash;
+use std::fmt::{Debug, Display};
+
+#[cfg(test)]
+#[path = "stateful_tree_tests.rs"]
+mod stateful_tree_tests;
+
+#[derive(Default)]
+pub struct StatefulTree<T>
+where
+  T: ToText + Hash + Clone + PartialEq + Eq + Debug + Default + Display,
+{
+  pub state: TreeState,
+  pub items: Vec<TreeItem<T>>,
+}
+
+impl<T> StatefulTree<T>
+where
+  T: ToText + Hash + Clone + PartialEq + Eq + Debug + Default + Display,
+{
+  pub fn set_items(&mut self, items: Vec<TreeItem<T>>) {
+    self.items = items;
+  }
+
+  pub fn current_selection(&self) -> Option<&T> {
+    self
+      .state
+      .flatten(&self.items)
+      .into_iter()
+      .find(|i| self.state.selected() == i.identifier)
+      .map(|item| item.item.content())
+  }
+
+  pub fn is_empty(&self) -> bool {
+    self.items.is_empty()
+  }
+}
+
+impl<T> Scrollable for StatefulTree<T>
+where
+  T: ToText + Hash + Clone + PartialEq + Eq + Debug + Default + Display,
+{
+  fn scroll_down(&mut self) {
+    self.state.key_down();
+  }
+
+  fn scroll_up(&mut self) {
+    self.state.key_up();
+  }
+
+  fn scroll_to_top(&mut self) {
+    self.state.select_first();
+  }
+
+  fn scroll_to_bottom(&mut self) {
+    self.state.select_last();
+  }
+}