feat(component): Add damage component to player

We can now specify the amount of damage that the hero can inflict.

src/spawner/mod.rs

@@ -16,6 +16,7 @@ pub fn spawn_player(ecs: &mut World, pos: Point) {
             max: 15,
         },
         FieldOfView::new(8),
+        Damage(1),
     ));
 }
 

src/systems/combat.rs

@@ -4,32 +4,49 @@ use crate::prelude::*;
 #[read_component(WantsToAttack)]
 #[read_component(Player)]
 #[write_component(Health)]
+#[read_component(Damage)]
+#[read_component(Carried)]
 pub fn combat(ecs: &mut SubWorld, commands: &mut CommandBuffer) {
     let mut attackers = <(Entity, &WantsToAttack)>::query();
 
-    let victims: Vec<(Entity, Entity)> = attackers
+    let victims: Vec<(Entity, Entity, Entity)> = attackers
         .iter(ecs)
-        .map(|(entity, attack)| (*entity, attack.victim))
+        .map(|(entity, attack)| (*entity, attack.attacker, attack.victim))
         .collect();
 
-    victims.iter().for_each(|(message, victim)| {
+    victims.iter().for_each(|(message, attacker, victim)| {
         let is_player = ecs
             .entry_ref(*victim)
             .unwrap()
             .get_component::<Player>()
             .is_ok();
 
+        let base_damage = if let Ok(v) = ecs.entry_ref(*attacker) {
+            if let Ok(dmg) = v.get_component::<Damage>() {
+                dmg.0
+            } else {
+                0
+            }
+        } else {
+            0
+        };
+
+        let weapon_damage: i32 = <(&Carried, &Damage)>::query().iter(ecs)
+            .filter(|(carried, _)| carried.0 == *attacker)
+            .map(|(_, dmg)| dmg.0)
+            .sum();
+
+        let final_damage = base_damage + weapon_damage;
+
         if let Ok(mut health) = ecs
             .entry_mut(*victim)
             .unwrap()
             .get_component_mut::<Health>()
         {
-            println!("Health before attack: {}", health.current);
-            health.current -= 1;
+            health.current -= final_damage;
             if health.current < 1 && !is_player {
                 commands.remove(*victim);
             }
-            println!("Health after attack: {}", health.current);
         }
         commands.remove(*message);
     });