From ad60e242e2d432b436de79ffeb76637e62b057d8 Mon Sep 17 00:00:00 2001
From: Arnold <27396817+arngo@users.noreply.github.com>
Date: Sun, 28 May 2023 12:56:19 -0400
Subject: implement random enemy spawning

---
 src/enemies.c | 32 ++++++++++++++++++++++++++++++++
 src/enemies.h | 10 ++++++++++
 src/main.c    |  7 ++++---
 src/wall.c    | 15 +++++++++++++++
 src/wall.h    |  6 ++++++
 5 files changed, 67 insertions(+), 3 deletions(-)

diff --git a/src/enemies.c b/src/enemies.c
index 19e1c3e..ad09e68 100644
--- a/src/enemies.c
+++ b/src/enemies.c
@@ -3,10 +3,12 @@
 #include "cglm/vec2.h"
 #include "player.h"
 #include "bullet.h"
+#include "wall.h"
 
 static rodeo_collision_2d_world_t collision_enemies_world = {0};
 static rodeo_texture_2d_t enemy_texture;
 static cvec_enemy_t enemies = {0};
+static float spawn_cooldown = 0;
 
 void
 init_enemies(void)
@@ -253,3 +255,33 @@ group_follow_target(rodeo_collision_2d_world_item_t *target)
 		enemy->dy = result[1];
 	}
 }
+
+enemy_t*
+random_enemy_create(
+	rodeo_rectangle_t bounds
+)
+{
+	float spawn_coords[2];
+	for (int i = 0; i < 100; ++i) {
+		spawn_coords[0] = (float)rodeo_random_double_get() * bounds.width + bounds.x;
+		spawn_coords[1] = (float)rodeo_random_double_get() * bounds.height + bounds.y;
+		if (!coords_inside_wall(spawn_coords[0], spawn_coords[1])) {
+			return spawn_enemy(spawn_coords[0], spawn_coords[1]);
+		}
+	}
+	rodeo_log(rodeo_logLevel_info, "failed to spawn enemy");
+	return NULL;
+}
+
+enemy_t*
+attempt_random_enemy_spawn(
+	rodeo_rectangle_t bounds
+)
+{
+	spawn_cooldown -= rodeo_frame_time_get();
+	if (spawn_cooldown <= 0) {
+		spawn_cooldown += (float)rodeo_random_double_get() * 5000.0f + 1500.0f;
+		return random_enemy_create(bounds);
+	}
+	return NULL;
+}
diff --git a/src/enemies.h b/src/enemies.h
index 29a147a..dc6f721 100644
--- a/src/enemies.h
+++ b/src/enemies.h
@@ -82,3 +82,13 @@ detect_bullet_enemy_collisions(void);
 
 void
 group_follow_target(rodeo_collision_2d_world_item_t *target);
+
+enemy_t*
+random_enemy_create(
+	rodeo_rectangle_t bounds
+);
+
+enemy_t*
+attempt_random_enemy_spawn(
+	rodeo_rectangle_t bounds
+);
diff --git a/src/main.c b/src/main.c
index ec0d3a5..a8783f5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -190,6 +190,7 @@ main_loop(void)
 	   */
 
 	   enemies_attempt_weapon_fire();
+	   attempt_random_enemy_spawn((rodeo_rectangle_t){ 0, 0, window_width, window_height });
 
 	   move_bullets();
 	   move_enemies();
@@ -276,10 +277,10 @@ main(void)
 		init_player();
 		init_enemies();
 		init_wall();
-		spawn_enemy(240, 240);
+		//spawn_enemy(240, 240);
 		//spawn_enemy(100, 100);
-		spawn_enemy(300, 100);
-		spawn_enemy(200, 330);
+		//spawn_enemy(300, 100);
+		//spawn_enemy(200, 330);
 		new_wall(0, -10, window_width, 10);
 		new_wall(0, window_height, window_width, 10);
 		new_wall(-10, 0, 10, window_height);
diff --git a/src/wall.c b/src/wall.c
index d2b1319..5a2d6df 100644
--- a/src/wall.c
+++ b/src/wall.c
@@ -38,3 +38,18 @@ new_wall(
 				.height = height
 			});
 }
+
+bool
+coords_inside_wall(
+    float x,
+    float y
+)
+{
+	c_foreach(i, cvec_collision_2d_world_item, collision_wall_world) {
+		if (x >= i.ref->x && x <= i.ref->x + i.ref->width &&
+				y >= i.ref->y && y <= i.ref->y + i.ref->height) {
+			return true;
+		}
+	}
+	return false;
+}
diff --git a/src/wall.h b/src/wall.h
index 7b0f9fe..6e3dc48 100644
--- a/src/wall.h
+++ b/src/wall.h
@@ -16,3 +16,9 @@ new_wall(
     float width,
     float height
 );
+
+bool
+coords_inside_wall(
+    float x,
+    float y
+);
-- 
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