From 33dc8e4cd4987a9f439767cf23812dce835fb4a5 Mon Sep 17 00:00:00 2001
From: arngo <27396817+arngo@users.noreply.github.com>
Date: Fri, 26 May 2023 16:12:34 -0400
Subject: implement enemy bullet damage

---
 src/enemies.c | 31 +++++++++++++++++++++++++++++++
 src/enemies.h |  7 +++++++
 src/main.c    |  4 ++++
 3 files changed, 42 insertions(+)

diff --git a/src/enemies.c b/src/enemies.c
index 8c1f71c..a8705ed 100644
--- a/src/enemies.c
+++ b/src/enemies.c
@@ -1,4 +1,5 @@
 #include "enemies.h"
+#include "bullet.h"
 
 static rodeo_collision_2d_world_t collision_enemies_world;
 static rodeo_texture_2d_t enemy_texture;
@@ -77,3 +78,33 @@ get_enemies_cvec(void)
 {
 	return enemies;
 }
+
+void enemy_destroy(
+	cvec_enemy_t_value* enemy 
+)
+{
+	rodeo_collision_2d_world_item_destroy_by_id(enemy->id);
+	*enemy = *cvec_enemy_t_back(&enemies);
+    cvec_enemy_t_pop(&enemies);
+
+}
+
+void
+damage_enemy_resolver(
+	rodeo_collision_2d_world_item_t *enemy_collision,
+	rodeo_collision_2d_world_item_t *bullet_collision
+)
+{
+	rodeo_collision_2d_world_item_destroy(bullet_collision);
+	enemy_t *enemy = get_enemy_by_id(enemy_collision->id);
+	enemy->hp -= 10;
+	if (enemy->hp <= 0) {
+		enemy_destroy(enemy);
+	}
+}
+
+void
+detect_bullet_enemy_collisions(void)
+{
+	rodeo_collision_2d_world_compare_other(&collision_enemies_world, get_player_bullet_world(), damage_enemy_resolver);
+}
diff --git a/src/enemies.h b/src/enemies.h
index 0b0d908..b5cc916 100644
--- a/src/enemies.h
+++ b/src/enemies.h
@@ -39,3 +39,10 @@ get_enemies_world(void);
 
 cvec_enemy_t
 get_enemies_cvec(void);
+
+void enemy_destroy(
+	cvec_enemy_t_value* enemy 
+);
+
+void
+detect_bullet_enemy_collisions(void);
diff --git a/src/main.c b/src/main.c
index d928615..1078f46 100644
--- a/src/main.c
+++ b/src/main.c
@@ -188,6 +188,7 @@ main_loop(void)
 	   draw_bullets();
 	   draw_player();
 	   draw_enemies();
+	   detect_bullet_enemy_collisions();
 
 		rodeo_debug_text_draw(
 			1,
@@ -270,6 +271,9 @@ main(void)
 		init_player();
 		init_enemies();
 		spawn_enemy(240, 240);
+		spawn_enemy(100, 100);
+		spawn_enemy(300, 100);
+		spawn_enemy(200, 330);
 
 		rodeo_mainLoop_run(
 			main_loop
-- 
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