ammo system

* heads have abilities
* health and ammo shows in ui

src/backpack/mod.rs

@@ -1,38 +1,18 @@
 mod backpack_ui;
+mod ui_head_state;
 
-use crate::{GameState, heads_ui::HEAD_COUNT};
+use crate::{
+    GameState,
+    active_heads::{HEAD_COUNT, HeadState},
+};
 use bevy::prelude::*;
 
 pub use backpack_ui::BackpackAction;
-
-#[derive(Clone, Copy, Debug, PartialEq, Reflect)]
-pub struct BackpackHead {
-    pub head: usize,
-    pub health: f32,
-    pub ammo: f32,
-}
-
-impl BackpackHead {
-    pub fn new(head: usize) -> Self {
-        Self {
-            head,
-            health: 1.0,
-            ammo: 1.0,
-        }
-    }
-
-    pub fn damage(&self) -> f32 {
-        1. - self.health
-    }
-
-    pub fn ammo_used(&self) -> f32 {
-        1. - self.ammo
-    }
-}
+pub use ui_head_state::UiHeadState;
 
 #[derive(Resource, Default)]
 pub struct Backpack {
-    pub heads: Vec<BackpackHead>,
+    pub heads: Vec<HeadState>,
 }
 
 #[derive(Event)]
@@ -47,11 +27,7 @@ pub fn plugin(app: &mut App) {
 fn setup(mut commands: Commands) {
     commands.insert_resource(Backpack {
         heads: (0usize..HEAD_COUNT)
-            .map(|i| BackpackHead {
-                head: i,
-                health: 1.,
-                ammo: 1.,
-            })
+            .map(|i| HeadState::new(i, 10))
             .collect(),
     });
 }