extends ExplosiveProjectile
class_name BouncingProjectile

var fuse_time: float = -1.0 # -1 means no fuse started yet
var bounce_fuse_delay: float = 3.0 # How long to wait after bouncing
var impact_detonate_time: float = 2.0
var bounciness: float = 0.4
var flight_time: float = 0.0

func _physics_process(delta: float) -> void:
	flight_time += delta
	
	if fuse_time > 0.0:
		fuse_time -= delta
		if fuse_time <= 0.0:
			_explode(global_position)
			destroy()
			return
			
	# Apply gravity drop if any
	velocity.y -= drop_gravity * delta
	
	var movement = velocity * delta
	
	var space_state = get_world_3d().direct_space_state
	var query = PhysicsRayQueryParameters3D.create(_previous_position, global_position + movement)
	if owner_player:
		query.exclude = [owner_player.get_rid()]
		
	var result = space_state.intersect_ray(query)
	if result:
		if flight_time > impact_detonate_time:
			# Explode on impact if flying long enough
			_on_hit(result)
		else:
			# Bounce
			global_position = result.position + result.normal * 0.05
			_previous_position = global_position
			
			# Reflect velocity
			velocity = velocity.bounce(result.normal) * bounciness
			
			# Start the fuse if it hasn't started
			if fuse_time < 0.0:
				fuse_time = bounce_fuse_delay
			
			# If it hits an entity directly, still bounce, it's a heavy mortar shell!
	else:
		global_position += movement
		distance_traveled += movement.length()
		_previous_position = global_position