extends KinematicBody2D

const WIND = 20
const SPEED = 400
const STEERING = deg2rad(5)
const WINDLIMIT = deg2rad(180-45)
const WINDDIR = Vector2(0,1)
const STEERPEN = 1
const ACCELERATION = 2

var velocity = Vector2(0,10)

func _calculate_velocity(_velocity, _acceleration, _rotation):
	velocity = _velocity * _acceleration
	velocity = velocity.clamped(_calculate_maxspeed())
	return velocity.rotated(_rotation)

func _calculate_maxspeed():
	var angle_to_wind = WINDDIR.angle_to(velocity)
	if angle_to_wind > WINDLIMIT || angle_to_wind < -WINDLIMIT:
		return 0.1
	else:
		return 75

func _physics_process(_delta):
	if Input.is_action_pressed("right"):
		velocity = _calculate_velocity(velocity, STEERPEN, STEERING)
		rotate(STEERING)
	elif Input.is_action_pressed("left"):
		velocity = _calculate_velocity(velocity, STEERPEN, -STEERING)
		rotate(-STEERING)
	else:
		velocity = _calculate_velocity(velocity, ACCELERATION, 0)
	velocity = move_and_slide(velocity)

func _ready():
	pass