From 1d392198b9e5c27f1072e09c80e4fb8dc74497f8 Mon Sep 17 00:00:00 2001
From: mnmaita <47983254+mnmaita@users.noreply.github.com>
Date: Thu, 16 Nov 2023 01:49:27 +0100
Subject: [PATCH] Adds projectile attacks to enemies

---
 src/game/enemy.rs | 50 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 47 insertions(+), 3 deletions(-)

diff --git a/src/game/enemy.rs b/src/game/enemy.rs
index 6f61d2e..dca7bf2 100644
--- a/src/game/enemy.rs
+++ b/src/game/enemy.rs
@@ -3,7 +3,10 @@ use rand::seq::IteratorRandom;
 
 use crate::{physics::Speed, playing};
 
-use super::{combat::Range, BorderTile, Hitpoints, Player, TILE_SIZE};
+use super::{
+    combat::{AttackDamage, AttackTimer, Range, SpawnProjectileEvent},
+    BorderTile, Hitpoints, Player, TILE_SIZE,
+};
 
 pub(super) struct EnemyPlugin;
 
@@ -11,14 +14,19 @@ impl Plugin for EnemyPlugin {
     fn build(&self, app: &mut App) {
         app.insert_resource(EnemySpawnTimer::new(3.));
 
-        app.add_systems(FixedUpdate, (spawn_enemies, move_enemies).run_if(playing()));
+        app.add_systems(
+            FixedUpdate,
+            (spawn_enemies, move_enemies, attack_player).run_if(playing()),
+        );
     }
 }
 
 #[derive(Bundle)]
 pub struct EnemyBundle {
-    pub marker: Enemy,
+    pub attack_damage: AttackDamage,
+    pub attack_timer: AttackTimer,
     pub hitpoints: Hitpoints,
+    pub marker: Enemy,
     pub range: Range,
     pub speed: Speed,
     pub sprite: SpriteBundle,
@@ -48,6 +56,8 @@ fn spawn_enemies(
             let translation = tile_transform.translation.truncate().extend(1.);
 
             commands.spawn(EnemyBundle {
+                attack_damage: AttackDamage(5),
+                attack_timer: AttackTimer(Timer::from_seconds(5., TimerMode::Repeating)),
                 hitpoints: Hitpoints::new(1),
                 marker: Enemy,
                 range: Range(TILE_SIZE.x * 3.),
@@ -82,3 +92,37 @@ fn move_enemies(
         }
     }
 }
+
+fn attack_player(
+    mut spawn_projectile_event_writer: EventWriter<SpawnProjectileEvent>,
+    mut enemy_query: Query<
+        (Entity, &Transform, &mut AttackTimer, &Range, &AttackDamage),
+        With<Enemy>,
+    >,
+    player_query: Query<&Transform, (With<Player>, Without<Enemy>)>,
+    time: Res<Time>,
+) {
+    let player_transform = player_query.single();
+    let player_position = player_transform.translation.truncate();
+
+    for (enemy_entity, enemy_transform, mut enemy_attack_timer, enemy_range, enemy_attack_damage) in
+        &mut enemy_query
+    {
+        if enemy_attack_timer.tick(time.delta()).just_finished() {
+            let enemy_position = enemy_transform.translation.truncate();
+
+            if enemy_position.distance(player_position) <= enemy_range.0 {
+                let direction = (player_position - enemy_position).normalize();
+                let emitter = enemy_entity;
+
+                spawn_projectile_event_writer.send(SpawnProjectileEvent::new(
+                    enemy_attack_damage.0,
+                    direction,
+                    emitter,
+                    enemy_position,
+                    1000.,
+                ))
+            }
+        }
+    }
+}