add kick system

scripts/Rock.gd

@@ -4,15 +4,14 @@ enum State { IDLE, FLYING }
 
 const AIR_FRICTION  := 0.84
 const MIN_SPEED     := 0.5
-const DAMAGE_MULT   := 0.9
 const WALL_BOUNCE   := 0.5
 const WALL_SELF_DMG := 0.6
-const HIT_SELF_DMG  := 0.4
 
 var state: State = State.IDLE
 var fly_vel: Vector3 = Vector3.ZERO
 var health: float = 60.0
 var dead: bool = false
+var damage_modifier: float = 1.25
 
 @onready var mesh_node: MeshInstance3D = $RockMesh
 var rock_mat: StandardMaterial3D
@@ -25,6 +24,12 @@ func _ready() -> void:
 	rock_mat = mesh_node.material_override.duplicate() as StandardMaterial3D
 	mesh_node.material_override = rock_mat
 
+func can_merge_with(_other: Node3D, _speed: float) -> bool:
+	return false
+
+func apply_collision_damage(dmg: float) -> void:
+	_take_damage(dmg)
+
 func receive_kick(direction: Vector3, force: float) -> void:
 	fly_vel = direction * force
 	fly_vel.y = 0.0
@@ -57,14 +62,16 @@ func _fly(delta: float) -> void:
 			_take_damage(speed_now * WALL_SELF_DMG)
 			handled = true
 			break
-		elif col3d.is_in_group("enemies"):
-			var to_enemy := col3d.global_position - global_position
-			to_enemy.y = 0.0
-			var dir := to_enemy.normalized() if to_enemy.length() > 0.01 else (fly_vel.normalized() if fly_vel.length() > 0.01 else Vector3.FORWARD)
-			col3d.call("_take_hit", int(speed_now * DAMAGE_MULT))
-			col3d.call("receive_kick", dir, speed_now * 0.65)
+		elif col3d.is_in_group("enemies") or col3d.is_in_group("rocks"):
+			if col3d == self:
+				continue
+			KickSystem.resolve(self, col3d, fly_vel)
+			if not dead and is_instance_valid(col3d):
+				var kick_dir := col3d.global_position - global_position
+				kick_dir.y = 0.0
+				if kick_dir.length() > 0.01:
+					col3d.call("receive_kick", kick_dir.normalized(), speed_now * 0.65)
 			fly_vel *= 0.45
-			_take_damage(speed_now * HIT_SELF_DMG)
 			handled = true
 			break