different ammo per head (#30)

src/backpack/mod.rs

@@ -4,6 +4,7 @@ mod ui_head_state;
 use crate::{
     GameState,
     heads::{HEAD_COUNT, HeadState},
+    heads_database::HeadsDatabase,
 };
 use bevy::prelude::*;
 
@@ -36,10 +37,10 @@ pub fn plugin(app: &mut App) {
     app.add_systems(OnEnter(GameState::Playing), setup);
 }
 
-fn setup(mut commands: Commands) {
+fn setup(mut commands: Commands, heads: Res<HeadsDatabase>) {
     commands.insert_resource(Backpack {
         heads: (0usize..HEAD_COUNT)
-            .map(|i| HeadState::new(i, 10))
+            .map(|i| HeadState::new(i, heads.as_ref()))
             .collect(),
     });
 }