extends Script

class Kinematic:
	
	var owner
	var velocity = Vector2(0, 0) # velocity to apply to position
	var orientation = Vector2(0, 0) # current orientation
	var rotation = 0.0 # radians to rotate
	
	# per instance custom
	var max_speed
	
	func _init(o, m):
		owner = o
		max_speed = m
	
	func get_position():
		return owner.get_global_pos()
	
	func get_orientation():
		return velocity.normalized()
	
	func update(steering, delta):
		
		owner.move(velocity * delta)
		if velocity.length() > 0:
			owner.set_rot(velocity.normalized().angle())
		
		velocity += steering.velocity * delta
		rotation += steering.rotation * delta
		
		# clip at max speed
		if velocity.length() > max_speed:
			velocity = velocity.normalized() * max_speed

class Steering:
	var velocity = Vector2(0, 0)
	var rotation = 0

class Seek:
	
	var owner
	var target
	var max_rot_speed = deg2rad(64) # degrees per second
	
	func _init(o):
		owner = o
	
	func get_steering(s):
		var tr = target.get_ref()
		if tr:
			# update velocity
			s.velocity = tr.get_global_pos() - owner.get_global_pos()
			# update orientation
			#if velocity.length() > 0:
			#	rotation = clamp(velocity.normalized().angle(), -max_rot_speed, max_rot_speed)
		else:
			target = null
	
	func set_target(t):
		target = weakref(t)
		
class Arrive:
	
	var owner
	var target
	
	# custom
	var radius = 0
	var time_to_target = 0
	
	func _init(o, r, a):
		owner = o
		radius = r
		time_to_target = a
	
	func get_steering(s):
		var tr = target.get_ref()
		if tr:
			if s.velocity.length() < radius:
				s.velocity.x = 0
				s.velocity.y = 0
			s.velocity /= time_to_target
		else:
			target = null
	
	func set_target(t):
		target = weakref(t)

class Flee:
	func init():
		pass
		
	func get_steering():
		pass

func _ready():
	pass