1 files changed, 180 insertions, 0 deletions
diff --git a/src/ui/bodies_window.rs b/src/ui/bodies_window.rs
new file mode 100644
index 0000000..6300f5f
--- /dev/null
+++ b/src/ui/bodies_window.rs
@@ -0,0 +1,180 @@
+use egui::Sense;
+
+use crate::eguictx::EguiCtx;
+use crate::ntree::{NTree, NTreeNode};
+use crate::solar_system::body::{BodyId, OrbitalBody};
+use crate::solar_system::{SolarSystem, SystemId};
+
+
+#[derive(Default, Clone)]
+pub struct BodiesWindowState
+{
+    last_system: Option<SystemId>,
+    system_heirarchy: NTree<SystemId>,
+    selected_body: Option<BodyId>
+}
+
+#[derive(Default, Clone)]
+pub struct BodiesWindowAction
+{
+    pub focus_body: Option<BodyId>
+}
+
+impl BodiesWindowState
+{
+    fn build_system_heirarchy_rec(
+        bodies: &[OrbitalBody],
+        node: &mut NTreeNode<BodyId>)
+    {
+        for body in bodies {
+            let orbit = body.get_orbit();
+            match orbit {
+                Some(orbit) => {
+                    if orbit.parent() != *node.value() {
+                        continue;
+                    }
+                },
+                None => {
+                    continue;
+                }
+            }
+            let mut subnode = NTreeNode::new(body.id());
+            BodiesWindowState::build_system_heirarchy_rec(bodies, &mut subnode);
+            node.insert_node(subnode);
+        }
+    }
+
+    fn rebuild_system_heirarchy(
+        &mut self,
+        star_system: &SolarSystem)
+    {
+        let mut root_node = NTreeNode::<BodyId>::new(0);
+
+        let bodies = star_system.bodies();
+        BodiesWindowState::build_system_heirarchy_rec(bodies, &mut root_node);
+        self.system_heirarchy.set_root(root_node);
+    }
+
+    pub fn render(
+        &mut self,
+        current_system: &SolarSystem,
+        eguictx: &EguiCtx)
+    -> BodiesWindowAction
+    {
+        match self.last_system {
+            Some(last_system) => {
+                if last_system != current_system.id() {
+                    self.rebuild_system_heirarchy(current_system);
+                }
+            },
+            None => {
+                self.rebuild_system_heirarchy(current_system);
+            }
+        }
+        self.last_system = Some(current_system.id());
+
+        let mut action = BodiesWindowAction::default();
+
+        egui::Window::new("Bodies")
+            .resizable(true)
+            .show(eguictx.context(), |ui| {
+            
+            ui.horizontal(|ui| {
+                self.paint_bodies_list(current_system, ui);
+                self.paint_body_info_panel(&mut action, current_system, ui);
+            });
+        });
+        action
+    }
+
+    fn paint_bodies_node_rec(
+        &self,
+        star_system: &SolarSystem,
+        node: &NTreeNode<BodyId>,
+        ui: &mut egui::Ui)
+    -> Option<BodyId>
+    {
+        let body = star_system.body(*node.value());
+        let children = node.children();
+
+        let selected = self.selected_body.is_some_and(|v| { v == *node.value() });
+        let mut new_selected = None;
+
+        if children.is_empty() {
+            if ui.selectable_label(selected, body.name()).clicked() {
+                new_selected = Some(*node.value());
+            }
+        }else{
+            egui::collapsing_header::CollapsingState::load_with_default_open(
+                ui.ctx(),
+                ui.make_persistent_id(format!("bodies_window_body_{}", body.id())),
+                true)
+            .show_header(ui, |ui| {
+                if ui.selectable_label(selected, body.name()).clicked() {
+                    new_selected = Some(*node.value());
+                }
+            })
+            .body(|ui| {
+                for child in children {
+                    let child_selected = self.paint_bodies_node_rec(star_system, child, ui);
+                    if child_selected.is_some() {
+                        new_selected = child_selected;
+                    }
+                }
+            });
+        };
+        new_selected
+    }
+
+    fn paint_bodies_list(
+        &mut self,
+        star_system: &SolarSystem,
+        ui: &mut egui::Ui)
+    -> Option<egui::Response>
+    {
+        let resp = egui::ScrollArea::vertical()
+            .auto_shrink(true)
+            .min_scrolled_height(200.0)
+            .show(ui, |ui| {
+                ui.vertical(|ui| {
+                    let root = self.system_heirarchy.root();
+                    let new_sel = self.paint_bodies_node_rec(star_system, root.as_ref().unwrap(), ui);
+                    if new_sel.is_some() {
+                        self.selected_body = new_sel;
+                    }
+            }).response
+        });
+        Some(resp.inner)
+    }
+
+    fn paint_body_info_panel(
+        &mut self,
+        action: &mut BodiesWindowAction,
+        star_system: &SolarSystem,
+        ui: &mut egui::Ui)
+    {
+        let selected_body = match self.selected_body {
+            Some(id) => { star_system.body(id) },
+            None => { return; }
+        };
+
+        ui.separator();
+        egui::Frame::canvas(ui.style())
+            .show(ui, |ui| {
+            ui.set_width(200.0);
+            ui.vertical_centered(|ui| {
+                ui.label(
+                    egui::RichText::new(selected_body.name())
+                    .heading());
+            });
+
+            ui.horizontal(|ui| {
+                let focus_resp = ui.button("Focus");
+
+                if focus_resp.clicked() {
+                    action.focus_body = Some(selected_body.id());
+                }
+            });
+        });
+    }
+}