extends Level

const ACCELERATION := 6.0

var speed := 4.0
var velocity := Vector2.ZERO
var target_velocity := Vector2.ZERO

@onready var model: Shambler = %Shambler
@onready var speed_label: Label = %SpeedLabel


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action("select_next_tool"):
		speed = min(speed + 0.1, 40)
	elif event.is_action("select_prev_tool"):
		speed = max(speed - 0.1, 0)


func _physics_process(delta: float) -> void:
	var move_input := Input.get_vector("move_left", "move_right", "move_forward", "move_back")
	target_velocity = move_input * speed

	velocity = velocity.lerp(target_velocity, 1 - exp(-ACCELERATION * delta))

	if velocity:
		model.set_target_rotation(atan2(velocity.x, velocity.y))

	var real_speed := velocity.length()
	speed_label.text = "%.2f" % real_speed
	model.set_move_speed(real_speed)
	model.global_position += Vector3(velocity.x, 0, velocity.y) * delta